Rock Mechanics Bulletin最新文献_第2页

Investigation of shale fracture behavior with different bedding properties based on discrete element method 基于离散元法的不同层理性质页岩破裂行为研究

IF 7

Rock Mechanics Bulletin Pub Date : 2026-04-01 Epub Date: 2025-09-06 DOI: 10.1016/j.rockmb.2025.100243

Dubo Wang , Jinyu Dong , Dongqiao Liu , Xiangjun Chen , Hai Zhong , Mijia Yang , Hongjian Wang

{"title":"Investigation of shale fracture behavior with different bedding properties based on discrete element method","authors":"Dubo Wang , Jinyu Dong , Dongqiao Liu , Xiangjun Chen , Hai Zhong , Mijia Yang , Hongjian Wang","doi":"10.1016/j.rockmb.2025.100243","DOIUrl":"10.1016/j.rockmb.2025.100243","url":null,"abstract":"<div><div>The interaction between cemented laminae and induced fractures plays a critical role in hydraulic fracture propagation within laminated shale reservoirs. By combining mode-I fracture mechanics experiment conducted on semi-circular bend (SCB) specimens of black carbonaceous shale from the marine Longmaxi Formation with numerical simulations, this study systematically investigates the effects of three key geological parameters: (1) bond strength, (2) vein stiffness, and (3) approach angle on fracture propagation characteristics. The key findings are summarized as follows: (1) Increasing the parallel bond strength promotes fracture crossing behavior. When the vein fracture toughness was reduced to 0.3, 0.2, and 0.1 times that of the shale matrix, fractures exhibited increased deflection tendency along the vein, creating longer stepped propagation paths. (2) For stiffer veins, induced fracture divert into the vein and propagate over longer distances; Additionally, more micro-cracks form within the vein before fracture-vein interaction occurs. (3) Fracture-vein interaction exhibits significant angular dependence: At approach angles between 60° and 90°, fractures predominantly penetrated laminae without deflection; Below 60°, fractures initially diverted into the vein but subsequently re-entered the matrix before reaching the vein terminus. This bifurcation pattern closely resembles laboratory observations of weakly cemented or pre-damaged vein specimens.</div></div>","PeriodicalId":101137,"journal":{"name":"Rock Mechanics Bulletin","volume":"5 2","pages":"Article 100243"},"PeriodicalIF":7.0,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145976466","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigation of shale fracture behavior with different bedding properties based on discrete element method 基于离散元法的不同层理性质页岩破裂行为研究

IF 7

Rock Mechanics Bulletin Pub Date : 2026-04-01 Epub Date: 2025-09-06 DOI: 10.1016/j.rockmb.2025.100243

Dubo Wang , Jinyu Dong , Dongqiao Liu , Xiangjun Chen , Hai Zhong , Mijia Yang , Hongjian Wang

{"title":"Investigation of shale fracture behavior with different bedding properties based on discrete element method","authors":"Dubo Wang , Jinyu Dong , Dongqiao Liu , Xiangjun Chen , Hai Zhong , Mijia Yang , Hongjian Wang","doi":"10.1016/j.rockmb.2025.100243","DOIUrl":"10.1016/j.rockmb.2025.100243","url":null,"abstract":"<div><div>The interaction between cemented laminae and induced fractures plays a critical role in hydraulic fracture propagation within laminated shale reservoirs. By combining mode-I fracture mechanics experiment conducted on semi-circular bend (SCB) specimens of black carbonaceous shale from the marine Longmaxi Formation with numerical simulations, this study systematically investigates the effects of three key geological parameters: (1) bond strength, (2) vein stiffness, and (3) approach angle on fracture propagation characteristics. The key findings are summarized as follows: (1) Increasing the parallel bond strength promotes fracture crossing behavior. When the vein fracture toughness was reduced to 0.3, 0.2, and 0.1 times that of the shale matrix, fractures exhibited increased deflection tendency along the vein, creating longer stepped propagation paths. (2) For stiffer veins, induced fracture divert into the vein and propagate over longer distances; Additionally, more micro-cracks form within the vein before fracture-vein interaction occurs. (3) Fracture-vein interaction exhibits significant angular dependence: At approach angles between 60° and 90°, fractures predominantly penetrated laminae without deflection; Below 60°, fractures initially diverted into the vein but subsequently re-entered the matrix before reaching the vein terminus. This bifurcation pattern closely resembles laboratory observations of weakly cemented or pre-damaged vein specimens.</div></div>","PeriodicalId":101137,"journal":{"name":"Rock Mechanics Bulletin","volume":"5 2","pages":"Article 100243"},"PeriodicalIF":7.0,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145976465","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Integration of image and dipole sonic logs for identification of natural fractures and stress-induced anisotropy in Asmari reservoir (A case study, SW Iran) 结合图像和偶极子声波测井识别Asmari储层天然裂缝和应力诱导的各向异性（以伊朗西南部为例）

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Rock Mechanics Bulletin Pub Date : 2026-04-01 Epub Date: 2025-08-21 DOI: 10.1016/j.rockmb.2025.100235

Maziar Torkaman , Soheila Bagheri , Mahdi Rastegarnia

{"title":"Integration of image and dipole sonic logs for identification of natural fractures and stress-induced anisotropy in Asmari reservoir (A case study, SW Iran)","authors":"Maziar Torkaman , Soheila Bagheri , Mahdi Rastegarnia","doi":"10.1016/j.rockmb.2025.100235","DOIUrl":"10.1016/j.rockmb.2025.100235","url":null,"abstract":"<div><div>Borehole sonic dispersion analysis is a technique that provides valuable insights into the realm of borehole sonic interpretation. This research involves an analysis of shear-wave anisotropy and ultrasonic image logs to differentiate between types of fractures and their orientations. Evaluating fractures relies on core samples and image logs are limited. This highlights the need for a more affordable and efficient way to analyse fractures. A challenge in the wellbore is distinguishing natural fractures from those caused by drilling. Using oil-based mud often makes it hard to find signs indicating the direction of in-situ stress. A new method has been created to reliably identify natural fractures when image logs are insufficient for mapping fracture networks. The cross-dipole data reveals five main zones exhibiting shear-wave splitting. Higher anisotropy is observed at shallower depths, while the deeper interval shows low porosity accompanied by considerable inhomogeneity, highlighting potential areas of concern. The dominant directions of anisotropy are aligned with NW-SE, WNW-ESE, and N-S orientations. Slowness frequency analysis of rotated flexural waves identifies fracture types. Dispersion profiles show natural and induced fractures, with cross-over patterns indicating stress-induced anisotropy. Significant inhomogeneity is observed in the bottom interval, where the differences between maximum and minimum energy level are pronounced. Wider dispersion curves suggest breakouts are slowing high-frequency flexural waves, indicating mechanical damage. The maximum stress direction is determined by the fast-shear azimuth. In conclusion, this study demonstrates that by integrating acoustic shear dispersion, shear anisotropy, Stoneley analysis, and image log data, fractures within the borehole wall can be effectively investigated.</div></div>","PeriodicalId":101137,"journal":{"name":"Rock Mechanics Bulletin","volume":"5 2","pages":"Article 100235"},"PeriodicalIF":7.0,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145120969","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Integrative solution of stress evolution in overburden roof strata during the coal seam mining by application of complex variable functions methodology 应用复变函数法综合求解煤层开采覆岩顶板应力演化

IF 7

Rock Mechanics Bulletin Pub Date : 2026-04-01 Epub Date: 2025-08-22 DOI: 10.1016/j.rockmb.2025.100236

Yinkai Li , Hongwei Wang , Zhanbin Zhu , Daixin Deng , Naisheng Jiang

{"title":"Integrative solution of stress evolution in overburden roof strata during the coal seam mining by application of complex variable functions methodology","authors":"Yinkai Li , Hongwei Wang , Zhanbin Zhu , Daixin Deng , Naisheng Jiang","doi":"10.1016/j.rockmb.2025.100236","DOIUrl":"10.1016/j.rockmb.2025.100236","url":null,"abstract":"<div><div>Large-scale roof collapse is a major dynamic hazard threatening the safe coal mine operations. Understanding the deformation and failure characteristics of overburden rock strata, as well as deciphering the stress evolution mechanism of overburden rock structure in mining stopes, is of great theoretical advancement and engineering applications in roof disasters prevention. This study employs a theoretical derivation to systematically analyze the characteristics of overburden roof deformation and caving behavior during the coal seam mining. By modeling the trapezoidal caving zone in the overburden roof strata as a complex functional system, the stress distribution within the caving zone and adjacent intact strata was mathematically characterized. Stress evolution patterns of overburden strata at different caving stages were derived under both elastic and elastoplastic deformation conditions, accompanied by the demarcation of elastic-plastic zones. In addition, the critical length for the first caving and periodic caving of overburden are theoretically determined. To validate the proposed analytical framework, comprehensive numerical simulation and physical model tests are conducted to investigate the overburden roof caving characteristics during coal seam mining. Quantitative comparisons between experimental, numerical results and theoretical analyses were performed in terms of the caving range of roof strata, the critical length for the roof strata caving and stress distribution. The consistencies among different approaches confirms the reliability of the theoretical model, providing a robust foundation for optimizing mining designs and implementing effective roof control strategies.</div></div>","PeriodicalId":101137,"journal":{"name":"Rock Mechanics Bulletin","volume":"5 2","pages":"Article 100236"},"PeriodicalIF":7.0,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145269218","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A method for evaluating the stability of roadway surrounding rock based on a modified damage evolution characteristic model considering rock mass residual strength and 3D DEM 基于改进的岩体残余强度损伤演化特征模型和三维DEM的巷道围岩稳定性评价方法

IF 7

Rock Mechanics Bulletin Pub Date : 2026-04-01 Epub Date: 2025-11-06 DOI: 10.1016/j.rockmb.2025.100271

Shengrong Xie , Yuxuan Wang , Yiyi Wu , Jian Yang , Zhigen Wang

{"title":"A method for evaluating the stability of roadway surrounding rock based on a modified damage evolution characteristic model considering rock mass residual strength and 3D DEM","authors":"Shengrong Xie , Yuxuan Wang , Yiyi Wu , Jian Yang , Zhigen Wang","doi":"10.1016/j.rockmb.2025.100271","DOIUrl":"10.1016/j.rockmb.2025.100271","url":null,"abstract":"<div><div>Repetitive mining in multi-seam conditions induces cumulative damage to surrounding rock, significantly increasing the risk of roadway instability. Taking the roadway in the extra-thick coal seam fully mechanized top-coal caving face as the research object, this study innovatively developed a modified damage evolution characteristic model that considers the residual strength of rock mass to quantify the regulatory effect of damage variable <em>D</em> on roof fracture span: damage to the main roof reduces the initial and periodic fracture spans, significantly increasing the probability of slippage and rotational instability of the voussoir beam structure. On this basis, a three-dimensional discrete element method (3D DEM) model was established, and orthogonal tests were designed to reveal the coupling mechanism of the spatial position of fracture lines and coal pillar width on rock mass damage. The results show that when the coal pillar width increases from 8 m to 16 m, the peak stress at the roadway ribs decreases by 26.5%–43.3%, and the influence range of the second invariant of the deviatoric stress tensor (<em>J</em><sub>2</sub>) shrinks. The attenuation of stress gradient leads to a decrease in the evolution rate of plastic damage with increasing coal pillar width, while the position of the fracture line has a weak regulatory effect on the stress-plastic response of the coal pillar. The results of theoretical analysis and 3D DEM simulations have effectively guided on-site engineering practice.</div></div>","PeriodicalId":101137,"journal":{"name":"Rock Mechanics Bulletin","volume":"5 2","pages":"Article 100271"},"PeriodicalIF":7.0,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145684304","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Integrative solution of stress evolution in overburden roof strata during the coal seam mining by application of complex variable functions methodology 应用复变函数法综合求解煤层开采覆岩顶板应力演化

IF 7

Rock Mechanics Bulletin Pub Date : 2026-04-01 Epub Date: 2025-08-22 DOI: 10.1016/j.rockmb.2025.100236

Yinkai Li , Hongwei Wang , Zhanbin Zhu , Daixin Deng , Naisheng Jiang

{"title":"Integrative solution of stress evolution in overburden roof strata during the coal seam mining by application of complex variable functions methodology","authors":"Yinkai Li , Hongwei Wang , Zhanbin Zhu , Daixin Deng , Naisheng Jiang","doi":"10.1016/j.rockmb.2025.100236","DOIUrl":"10.1016/j.rockmb.2025.100236","url":null,"abstract":"<div><div>Large-scale roof collapse is a major dynamic hazard threatening the safe coal mine operations. Understanding the deformation and failure characteristics of overburden rock strata, as well as deciphering the stress evolution mechanism of overburden rock structure in mining stopes, is of great theoretical advancement and engineering applications in roof disasters prevention. This study employs a theoretical derivation to systematically analyze the characteristics of overburden roof deformation and caving behavior during the coal seam mining. By modeling the trapezoidal caving zone in the overburden roof strata as a complex functional system, the stress distribution within the caving zone and adjacent intact strata was mathematically characterized. Stress evolution patterns of overburden strata at different caving stages were derived under both elastic and elastoplastic deformation conditions, accompanied by the demarcation of elastic-plastic zones. In addition, the critical length for the first caving and periodic caving of overburden are theoretically determined. To validate the proposed analytical framework, comprehensive numerical simulation and physical model tests are conducted to investigate the overburden roof caving characteristics during coal seam mining. Quantitative comparisons between experimental, numerical results and theoretical analyses were performed in terms of the caving range of roof strata, the critical length for the roof strata caving and stress distribution. The consistencies among different approaches confirms the reliability of the theoretical model, providing a robust foundation for optimizing mining designs and implementing effective roof control strategies.</div></div>","PeriodicalId":101137,"journal":{"name":"Rock Mechanics Bulletin","volume":"5 2","pages":"Article 100236"},"PeriodicalIF":7.0,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145269796","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of loading rates and mine water immersion on the mechanical characteristics of coal under Brazilian test conditions 巴西试验条件下加载速率和矿井浸水对煤力学特性的影响

IF 7

Rock Mechanics Bulletin Pub Date : 2026-04-01 Epub Date: 2025-07-17 DOI: 10.1016/j.rockmb.2025.100223

Xiaobin Li , Gan Feng , Xu Wang , Jianxiong Yang , Yu Zhao , Guifeng Wang , Mingli Xiao , Chunyu Gao , Huaizhong Liu

{"title":"Effects of loading rates and mine water immersion on the mechanical characteristics of coal under Brazilian test conditions","authors":"Xiaobin Li , Gan Feng , Xu Wang , Jianxiong Yang , Yu Zhao , Guifeng Wang , Mingli Xiao , Chunyu Gao , Huaizhong Liu","doi":"10.1016/j.rockmb.2025.100223","DOIUrl":"10.1016/j.rockmb.2025.100223","url":null,"abstract":"<div><div>The mechanical properties of coal pillars are crucial for evaluating the stability of underground water reservoirs in coal mines. This article examines the fracture mechanical behavior of coal in response to mine water immersion, layer direction, and loading rate. Eight types of specimens were studied, featuring inclination angles between the applied force and the bedding plane of 0°, 15°, 30°, 45°, 60°, 75°, 90°, and the Divider type. The loading rates (<em>V</em>) tested were 0.005 kN/s, 0.02 kN/s, 0.05 kN/s, and 0.1 kN/s. The results indicated that after immersion in mine water for 30 days, the Brazilian splitting strength (<em>BSS</em>), splitting modulus (<em>E</em><sub><em>m</em></sub>), and absorbed energy (<em>U</em><sub><em>a</em></sub>) of coal decreased by 51.35%, 52.37%, and 44.60%, respectively, compared to the non-immersion samples. The primary reason for this phenomenon is that the production rate of micropores and small pores resulting from mine water immersion surpasses their conversion rate to mesopores and macropores. This imbalance leads to the fragmentation of the internal structure of coal and the interconnection of pore fracture zones, thereby significantly weakening its bearing capacity. It has been observed that the relative proportions of failure mechanisms along and across the bedding plane directly influence the variations in coal mechanical properties at different <em>θ</em> values. Additionally, <em>BSS</em>, <em>E</em><sub><em>m</em></sub>, and <em>U</em><sub><em>a</em></sub> of coal gradually increase with an increase in loading rate, which is due to the reduced duration of coal damage development and evolution, subsequently lowering the probability of activating weak structures.</div></div>","PeriodicalId":101137,"journal":{"name":"Rock Mechanics Bulletin","volume":"5 2","pages":"Article 100223"},"PeriodicalIF":7.0,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145222922","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of loading rates and mine water immersion on the mechanical characteristics of coal under Brazilian test conditions 巴西试验条件下加载速率和矿井浸水对煤力学特性的影响

IF 7

Rock Mechanics Bulletin Pub Date : 2026-04-01 Epub Date: 2025-07-17 DOI: 10.1016/j.rockmb.2025.100223

Xiaobin Li , Gan Feng , Xu Wang , Jianxiong Yang , Yu Zhao , Guifeng Wang , Mingli Xiao , Chunyu Gao , Huaizhong Liu

{"title":"Effects of loading rates and mine water immersion on the mechanical characteristics of coal under Brazilian test conditions","authors":"Xiaobin Li , Gan Feng , Xu Wang , Jianxiong Yang , Yu Zhao , Guifeng Wang , Mingli Xiao , Chunyu Gao , Huaizhong Liu","doi":"10.1016/j.rockmb.2025.100223","DOIUrl":"10.1016/j.rockmb.2025.100223","url":null,"abstract":"<div><div>The mechanical properties of coal pillars are crucial for evaluating the stability of underground water reservoirs in coal mines. This article examines the fracture mechanical behavior of coal in response to mine water immersion, layer direction, and loading rate. Eight types of specimens were studied, featuring inclination angles between the applied force and the bedding plane of 0°, 15°, 30°, 45°, 60°, 75°, 90°, and the Divider type. The loading rates (<em>V</em>) tested were 0.005 kN/s, 0.02 kN/s, 0.05 kN/s, and 0.1 kN/s. The results indicated that after immersion in mine water for 30 days, the Brazilian splitting strength (<em>BSS</em>), splitting modulus (<em>E</em><sub><em>m</em></sub>), and absorbed energy (<em>U</em><sub><em>a</em></sub>) of coal decreased by 51.35%, 52.37%, and 44.60%, respectively, compared to the non-immersion samples. The primary reason for this phenomenon is that the production rate of micropores and small pores resulting from mine water immersion surpasses their conversion rate to mesopores and macropores. This imbalance leads to the fragmentation of the internal structure of coal and the interconnection of pore fracture zones, thereby significantly weakening its bearing capacity. It has been observed that the relative proportions of failure mechanisms along and across the bedding plane directly influence the variations in coal mechanical properties at different <em>θ</em> values. Additionally, <em>BSS</em>, <em>E</em><sub><em>m</em></sub>, and <em>U</em><sub><em>a</em></sub> of coal gradually increase with an increase in loading rate, which is due to the reduced duration of coal damage development and evolution, subsequently lowering the probability of activating weak structures.</div></div>","PeriodicalId":101137,"journal":{"name":"Rock Mechanics Bulletin","volume":"5 2","pages":"Article 100223"},"PeriodicalIF":7.0,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145222923","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

From lab forces to field lifespans: How rock and operating parameters govern TBM disc cutter wear 从实验室力到现场寿命：岩石和操作参数如何控制TBM盘刀磨损

IF 7

Rock Mechanics Bulletin Pub Date : 2026-04-01 Epub Date: 2025-12-02 DOI: 10.1016/j.rockmb.2025.100278

Ehsan Mohtarami , Amin Hekmatnejad , Georg H. Erharter , Alvaro Pena

{"title":"From lab forces to field lifespans: How rock and operating parameters govern TBM disc cutter wear","authors":"Ehsan Mohtarami , Amin Hekmatnejad , Georg H. Erharter , Alvaro Pena","doi":"10.1016/j.rockmb.2025.100278","DOIUrl":"10.1016/j.rockmb.2025.100278","url":null,"abstract":"<div><div>Tunnel boring machines (TBMs) are considered a reliable and fast method for boring long tunnels. However, the wear and failure of disc cutters in hard rock influences the efficiency of equipment, ultimate timeline, and project cost. Therefore, estimating the cutter life under different geomechanical conditions is crucial for TBM manufacturers and tunnel engineers. This study investigates the influence of geomechanical factors, including elastic modulus (<em>E</em>), uniaxial compressive strength (<em>σ</em><sub><em>c</em></sub>), confining stresses, and TBM operational parameters such as penetration rate (<em>P</em>) and disc cutter inclination angle (<em>ϕ</em>), on disc cutter wear using the explicit finite element method. The results revealed that the uniaxial compressive strength, disc cutter inclination angle, rock elastic modulus, and confining stresses, in that order, had the greatest impact on the cutter wear rate. Such that an increase in compressive strength from 31 MPa to 137.9 MPa caused a 2.4-fold reduction in cutter life. Meanwhile, the cutter life in the rock without confining stress was only 15% greater than in the sample under 15 MPa of confining stress. Additionally, to achieve the most optimal and economical drilling conditions, the penetration depth of the disc cutters should be optimized based on the existing conditions. Since the installation location of the disc cutters, their spacing and rotational trajectory significantly influence wear levels, a full-scale simulation of a TBM is conducted according to a real case study. The comparison of results indicated that the proposed method has high capability in estimating the cutter life under various geomechanical conditions.</div></div>","PeriodicalId":101137,"journal":{"name":"Rock Mechanics Bulletin","volume":"5 2","pages":"Article 100278"},"PeriodicalIF":7.0,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145799754","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thermo-mechanical coupling in cracked granite: Influence of crack inclination on fracture behavior and temperature evolution 裂纹花岗岩的热-力耦合：裂纹倾角对断裂行为和温度演化的影响

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Rock Mechanics Bulletin Pub Date : 2026-04-01 Epub Date: 2025-11-04 DOI: 10.1016/j.rockmb.2025.100272

Chenrui Huang , Chaomin Mu , Fei Wang , Yangyong Wu

{"title":"Thermo-mechanical coupling in cracked granite: Influence of crack inclination on fracture behavior and temperature evolution","authors":"Chenrui Huang , Chaomin Mu , Fei Wang , Yangyong Wu","doi":"10.1016/j.rockmb.2025.100272","DOIUrl":"10.1016/j.rockmb.2025.100272","url":null,"abstract":"<div><div>Crack inclination angle (<em>α</em>) plays a critical role in the dynamic failure and thermo-mechanical coupling of granite, which is vital for rockburst monitoring and prevention. In this study, granite specimens with various prefabricated crack inclinations (<em>α</em> = 0°, 30°, 60°, 90°) were tested using a split Hopkinson pressure bar (SHPB) system. Transient crack tip temperatures were monitored in real time by high-speed infrared thermography, and crack propagation was analyzed using digital image correlation (DIC). The results show that: 1) Propagation mode and mechanical properties: Increasing crack inclination causes a transition from pure tensile propagation to tension–shear mixed modes. At <em>α</em> = 60°, enhanced shear promotes branching cracks, while at <em>α</em> = 90°, crack closure suppresses propagation and induces localized damage. 2) Strength characteristics: Peak stress exhibits a “U-shaped” trend with respect to <em>α</em>, reaching the lowest value at <em>α</em> = 60°. 3) Thermal response: Crack tip temperature rise is strongly dependent on inclination. The maximum rise (up to 9.266 °C) occurs at <em>α</em> = 30° and 60° due to pronounced tension-shear coupling and frictional slip, whereas <em>α</em> = 0° and 90° show smaller increases. 4) Two-stage temperature evolution: Before peak stress, ∼80% of the temperature rise originates from plastic work; after peak stress, crack slip and friction dominate, leading to accelerated heating. 5) Crack tip temperature rise serves as a sensitive indicator of local energy concentration and disaster risk, providing theoretical support for monitoring and prevention strategies in deep mining.</div></div>","PeriodicalId":101137,"journal":{"name":"Rock Mechanics Bulletin","volume":"5 2","pages":"Article 100272"},"PeriodicalIF":7.0,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145684305","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0