International Journal of Rock Mechanics and Mining Sciences最新文献

{"title":"Experimental analysis of rock mass transport during dolomite and gas outburst","authors":"Katarzyna Kozieł ,&nbsp;Norbert Skoczylas","doi":"10.1016/j.ijrmms.2024.105969","DOIUrl":"10.1016/j.ijrmms.2024.105969","url":null,"abstract":"<div><div>In this paper, the problem of transporting rock material deep into the working is addressed. In the case of coal, literature reports indicate that sorbed gas is responsible for coal mass transport. As a result of laboratory tests, the marginality of sorption phenomena occurring in dolomite was confirmed. Transport of rock material during rock and gas outburst takes place in several stages. In the first stage, the post-outburst masses by gravity onto the bottom of the excavation and gas is released from the cavern which, after reaching a critical speed, entrains the accumulated material. A study was carried out to estimate the minimum start-up speed for grain transport. On the basis of analyses of the occurring gas-geodynamic phenomena and the conducted experimental tests, it can be concluded that on the basis of the size of the post-throw cavity and the length of the retention of the post-outburst masses, the work of transporting the post-outburst masses can be estimated. Finally, an energy balance of the rock-gas outburst phenomenon was performed based on the rock-gas system parameters estimated after two outbursts in dolomite.</div></div>","PeriodicalId":54941,"journal":{"name":"International Journal of Rock Mechanics and Mining Sciences","volume":"185 ","pages":"Article 105969"},"PeriodicalIF":7.0,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142704585","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Micromechanical model for simulating load transfer behavior and damage evolution for fully grouted rockbolt under axial loads","authors":"Kai Guan ,&nbsp;Xu Jiang ,&nbsp;Wancheng Zhu ,&nbsp;Wenjun Luo ,&nbsp;Hongping Li ,&nbsp;Bowang Li","doi":"10.1016/j.ijrmms.2024.105971","DOIUrl":"10.1016/j.ijrmms.2024.105971","url":null,"abstract":"<div><div>In the present paper the problems of the nonlinear debonding of anchorage interface, the strain-hardening and rupture of rockbolt, and the progressive damage of heterogeneous rock for the fully grouted rockbolt under axial loads are studied. A micromechanical numerical model is developed and implemented into the finite difference programme, to analyze the load transfer mechanism and damage evolution by introducing the bi-exponential shear slip model of interface, bilinear strain-hardening model of rockbolt and elastic damage model of rock. The close agreement between the simulation results of the proposed model and the theoretical and experimental data validates the model's capability for accurately characterizing the pull-out behavior of the grouted rockbolt. Failure type strongly depends on the strength of rock and anchorage interface, as well as the anchorage length. In particular, when rock strength is low, strain energy is predominantly dissipated through rock damage, leading to the interface failing to fully mobilize its load transfer effect, especially at a relatively long anchorage length. Moreover, the excessive interfacial adhesion performance causes a large range of serious damage in rock near the interface and leads to peak pull-out load even lower than the rockbolt with poor interfacial bonding properties. Finally, the critical anchorage length is investigated and the load transfer mechanism of the fully grouted rockbolt is clarified by comparing the case with or without rock damage. It is therefore very useful of the developed micromechanical model, since it provides an essential understanding of the load transferring capacity and failure type of the fully grouted rockbolt, especially under rock damage.</div></div>","PeriodicalId":54941,"journal":{"name":"International Journal of Rock Mechanics and Mining Sciences","volume":"185 ","pages":"Article 105971"},"PeriodicalIF":7.0,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142721905","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Semi-Automated rock block volume extraction from high-resolution 3D point clouds for enhanced rockfall hazard analysis","authors":"Giampiero Mineo ,&nbsp;Marco Rosone ,&nbsp;Chiara Cappadonia","doi":"10.1016/j.ijrmms.2024.105982","DOIUrl":"10.1016/j.ijrmms.2024.105982","url":null,"abstract":"<div><div>Rockfalls are critical landslide phenomena affecting human activities, with risk assessment based on hazard evaluation and potential impacts on exposed elements. Traditional methods for estimating unstable rock block volumes require direct measures often in hard-to-reach areas, hazardous, with time consuming approaches. This study introduces a semi-automatic method for estimating the most probable volume of the unstable blocks using open-source software (CloudCompare) to process 3D Point Cloud (PC) data obtained via Terrestrial Laser Scanning (TLS). The application area is a rock slope in a coastal sector of the northern Sicily (Italy) affected by frequent rockfalls phenomena. Both traditional field surveys and TLS were employed to characterize discontinuities and perform kinematic analyses. Volumes of already fallen blocks were directly measured, while unstable blocks were identified and volumetrically assessed using the PC-based procedure. Statistical analysis revealed that both created datasets conform to lognormal distributions; direct measurements show a better fit due to a larger sample size. Moreover, direct and indirect approaches were applied for recognition of main discontinuity sets influencing block detachment through planar sliding, toppling, and wedge failure. The proposed method offers a safer, more efficient alternative for rock mass characterization. Integration of traditional and remote sensing techniques facilitates accurate hazard evaluation, enhancing risk reduction strategies in vulnerable areas.</div></div>","PeriodicalId":54941,"journal":{"name":"International Journal of Rock Mechanics and Mining Sciences","volume":"185 ","pages":"Article 105982"},"PeriodicalIF":7.0,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142721903","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental study and model improvement on coal permeability: The influence of effective stress, slip effect, and water content","authors":"Zhiyong Xiao ,&nbsp;Gang Wang ,&nbsp;Jie Liu ,&nbsp;Huafeng Deng ,&nbsp;Yujing Jiang ,&nbsp;Feng Jiang ,&nbsp;Chengcheng Zheng","doi":"10.1016/j.ijrmms.2024.105972","DOIUrl":"10.1016/j.ijrmms.2024.105972","url":null,"abstract":"<div><div>Permeability is a critical parameter in coalbed methane (CBM) recovery and received increasing attention in recent years. The slip effect and effective stress exert competing influences on permeability, with coal exhibiting varying sensitivities to effective stress depending on their pore structures. The presence of water further complicates these interactions, affecting both the slip effect and permeability. This study investigates the pore structure and permeability characteristics of four coal cores at varying water contents using low-field nuclear magnetic resonance (NMR) and pulse pressure decay (PPD) methods. An enhanced apparent permeability model was developed by incorporating water content, effective stress, and the slip effect. The dynamic variations of compressibility coefficient, slip coefficient, and intrinsic permeability for Cores C-F were theoretically examined based on the refined model, and the critical pore pressures at which the slip effect becomes significant were identified. The results indicate that cores with larger average pore sizes exhibit more pronounced changes in fracture compressibility coefficients as water content increases. Additionally, the slip coefficient decreases with increasing pore pressure and is notably lower at reduced water contents. Intrinsic permeability increases more significantly with pore pressure at higher water content, with cores having larger average pore diameters showing greater sensitivity to these changes. The critical pore pressure, where the slip effect becomes significant, increases with water content and is higher in cores with smaller average pore sizes. Finally, various coefficients are proposed to quantitatively assess changes in fracture compressibility, slip coefficients, intrinsic permeability, and critical pore pressures under varying water content conditions, enabling more accurate analysis of permeability behavior.</div></div>","PeriodicalId":54941,"journal":{"name":"International Journal of Rock Mechanics and Mining Sciences","volume":"185 ","pages":"Article 105972"},"PeriodicalIF":7.0,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142704584","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of hydro-chemical corrosion on mechanical properties of red sandstone under uniaxial and triaxial compression","authors":"Chao Chen ,&nbsp;Wei Wang ,&nbsp;Yajun Cao ,&nbsp;Chaowei Chen ,&nbsp;Shifan Liu ,&nbsp;Wanqing Shen ,&nbsp;Qizhi Zhu","doi":"10.1016/j.ijrmms.2024.105967","DOIUrl":"10.1016/j.ijrmms.2024.105967","url":null,"abstract":"<div><div>The degradation of mechanical characteristics of sandstone, a common engineering material in acid environment, is directly related to the project service life forecast. In order to investigate the influence of water–rock interaction on the mechanical properties of red sandstone, a series of uniaxial and triaxial compression tests were conducted on sandstone immersed in solutions of different pH values and immersion times. Moreover, the effects of acid chemical corrosion on the microscopic structure of the sandstone were analyzed using scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS) tests. A chemical damage strength model was then formulated within the theoretical framework of chemical reaction kinetics theory. The results indicate that the different hydro-chemical solutions have a significant deterioration effect on the sandstone. In immersion tests, the water–rock reaction of sandstone is essentially completed after 30 days of immersion. With increasing immersion time, the uniaxial compressive strength of sandstone immersed in neutral and weakly acidic saline solutions shows an initial rapid decrease followed by a slow increase, while sandstone immersed in distilled water and strongly acidic solutions shows varying degrees of decrease over time. High confining pressure weakens the corrosion effect of the solutions on the sandstone, particularly, the neutral solution. In the triaxial compression tests, strong acid has a great corrosion effect on sandstone. The average peak strength of sandstone immersed in pH2, pH4, pH7, and distilled water decreased by 30.2%, 28.7%, 25.1%, and 22.8%, respectively. The model considers calcium precipitation not only reflects the change in pH value of the immersion solution with time but also effectively predicts the strength of sandstone immersed in different solutions. The results deepen our understanding of the deterioration mechanism of silicon-based porous rock under different chemical solutions and would be of importance for the long-term stability analysis of rock engineering in complex groundwater environments.</div></div>","PeriodicalId":54941,"journal":{"name":"International Journal of Rock Mechanics and Mining Sciences","volume":"185 ","pages":"Article 105967"},"PeriodicalIF":7.0,"publicationDate":"2024-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142696630","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Improvement of granite and concrete cutting efficiency using mixed-abrasives","authors":"Hyun-Joong Hwang ,&nbsp;Yohan Cha ,&nbsp;Tae-Min Oh ,&nbsp;Gye-Chun Cho","doi":"10.1016/j.ijrmms.2024.105970","DOIUrl":"10.1016/j.ijrmms.2024.105970","url":null,"abstract":"<div><div>Garnet and steel shot have advantages and disadvantages in terms of cutting performance and economic efficiency as single abrasive materials for cutting rock and concrete using abrasive waterjet. However, the application of abrasive waterjet technology in construction sites is still limited due to the cutting performance and cost limitations of single abrasive. A new strategy is needed for effective field application of abrasive waterjet technology. In this study, mixed-abrasives, which are mixtures of garnet and steel shot at various mass ratios, were applied to abrasive waterjet cutting to address the limitations of garnet and steel shot, and optimize their advantages. The cutting characteristics of mixed-abrasives were experimentally evaluated, and cost analysis of granite and concrete was performed. Granite and concrete used in the cutting experiment are brittle materials with P-wave velocity of 5346 m/s and 3968 m/s, a uniaxial compressive strength of 236 MPa and 49 MPa, respectively. Mixed-abrasives were classified into fresh and recycled mixed-abrasives. The latter was categorized into reused and submerged conditions, and its cutting performance was evaluated using natural and oven-drying methods. To maximize cutting efficiency in terms of specific energy, it is desirable to apply an abrasive flow rate of approximately 11 g/s. By comprehensively considering cutting performance and economic efficiency, the optimal mixing ratio of garnet and steel shot was 50:50. The critical abrasive collect rates of granite and concrete were evaluated at 18–21 % and 28–37 %, respectively, depending on the abrasive cost ratio. In conclusion, it was confirmed that efficient cutting using mixed-abrasives is possible in terms of practical applications. In addition, the results of this study provide appropriate guidelines for method design considering market price fluctuations of abrasives. Therefore, it is expected that effective application of abrasive waterjet technology to the field is possible.</div></div>","PeriodicalId":54941,"journal":{"name":"International Journal of Rock Mechanics and Mining Sciences","volume":"185 ","pages":"Article 105970"},"PeriodicalIF":7.0,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142696631","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fracture behavior of thermally treated granite under compression-shear loading","authors":"Chenxi Zhang ,&nbsp;Diyuan Li ,&nbsp;Xiaoli Su ,&nbsp;Pingkuang Luo ,&nbsp;Jinyin Ma ,&nbsp;Quanqi Zhu","doi":"10.1016/j.ijrmms.2024.105966","DOIUrl":"10.1016/j.ijrmms.2024.105966","url":null,"abstract":"<div><div>Understanding the fracture behavior of rock after thermal treatment is important in the deep rock engineering, such as nuclear waste disposal and geothermal energy exploration. In this work, to investigate fracture properties of thermally treated rock under compression-shear loading, a series of variable angle shear (VAS) tests were performed on shear-box (SB) granite specimens exposed to temperatures from 25 °C to 600 °C. The results indicate that the mode II fracture toughness <em>K</em>_IIC and shear modulus <em>G</em> of granite increase with temperature up to 300 °C, and then decrease. The deformation evolution of specimens was analyzed using a two-dimensional digital image correlation (2D-DIC) technique. It is found that wing cracks at all temperature firstly initiate from the upper notch tip prior to 40 % of peak load. The fracture mechanism of wing crack is identified as mixed mode I-II fracture via a displacement analysis, while dominant mechanism varies at different positions along wing crack paths. The influence of wing crack on overall fracture behavior was explored in detail and the load condition for wing crack initiation was verified based on the general maximum tangential stress (GMTS) criterion. In addition, the influence of temperature on the roughness of mode II fracture surfaces was investigated based on 3D optical scanner and fractal theory. The results show that the roughness of fracture surfaces firstly decreases from 25 °C to 300 °C then increases with temperature. There is a negative correlation between the <em>K</em>_IIC and the roughness of fracture surfaces. Finally, a more rigorous strategy is proposed to assess the reliability of new methods for estimating <em>K</em>_IIC.</div></div>","PeriodicalId":54941,"journal":{"name":"International Journal of Rock Mechanics and Mining Sciences","volume":"184 ","pages":"Article 105966"},"PeriodicalIF":7.0,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142696632","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical investigation of dynamic disturbance process induced by a mining tremor based on time-dependent moment tensor","authors":"Fan Chen ,&nbsp;Zhengzhao Liang ,&nbsp;Li Li ,&nbsp;Anye Cao ,&nbsp;Wencheng Song ,&nbsp;Zhenghu Zhang","doi":"10.1016/j.ijrmms.2024.105953","DOIUrl":"10.1016/j.ijrmms.2024.105953","url":null,"abstract":"<div><div>Coal bursts, arising from abrupt dynamic disturbances from mining tremors, are among the most critical dynamic disasters in underground coal mines. Understanding the dynamic disturbance process of mining tremors is crucial for unravelling the mechanism behind coal bursts and identifying high-risk zones. However, previous studies have often utilized oversimplified source representations to model the dynamic disturbances induced by mining tremors. These approaches may overlook complex wavefields resulting from the focal mechanism, leading to distortion in the dynamic disturbance process. In this study, a time-dependent moment tensor obtained from full-waveform inversion was employed as a more accurate source representation of mining tremors to model its dynamic disturbance process. Full-waveform moment tensor inversion was achieved in the time domain by decomposing the source time function (STF) into a weighted sum of several basis functions. To illustrate this methodology, a mining tremor that triggered a coal burst at Huating Coal Mine was selected as a case study. Based on a multi-layered geological model, the time-dependent moment tensor of this event was inverted and interpreted, revealing that the high-magnitude mining tremor spanned a duration of hundreds of milliseconds, rather than occurring instantaneously. Subsequently, a three-dimensional multi-layered FLAC3D model was constructed to reproduce the dynamic disturbance process of the mining tremor based on its moment tensor. The FLAC3D modeling revealed complex wavefields and radiated patterns. Obvious shifts in the peak zone of peak particle velocity (PPV) and principal stress magnitude (PSM) relative to the source position were observed in the coal seam due to the influence of focal mechanism and medium structure. Results from monitoring points within the coal seam show that a dynamic disturbance process characterized by complex cyclic loading and unloading at an intermediate strain rate, accompanied by intricate paths of principal stress rotation (PSR). Numerous monitoring results indicated that the PPV and PSM exhibit a logarithmic linear attenuation pattern as the target-source distance increases, and the dynamic stress magnitude is approximately three times the product of PPV and medium wave impedance. This modelling approach can enhance our understanding of the principal stress variation induced by mining tremors in a complex mining environment with coupled static-dynamic loadings.</div></div>","PeriodicalId":54941,"journal":{"name":"International Journal of Rock Mechanics and Mining Sciences","volume":"184 ","pages":"Article 105953"},"PeriodicalIF":7.0,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142696889","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mutual feedback and fracturing effect of hydraulic fractures in composite coal−rock reservoirs under different fracturing layer sequence conditions","authors":"Bo Li ,&nbsp;Yizheng He ,&nbsp;Zhen Shi ,&nbsp;Wang Jian ,&nbsp;Nannan Wang ,&nbsp;Yapeng Zhang","doi":"10.1016/j.ijrmms.2024.105968","DOIUrl":"10.1016/j.ijrmms.2024.105968","url":null,"abstract":"<div><div>Multistage fractures in different reservoirs exhibit competitive extension and mutual feeding mechanisms under different fracturing sequence conditions. To better understand these mechanisms for a more efficient extraction of mine gases, a combination of true triaxial physical tests and numerical simulation was performed in this study. The expansion process of hydraulic fractures in different layers and the comprehensive effect of fracturing were analyzed. The directional deflection effect of the induced stress field on the hydraulic fractures can be summarized as follows. In terms of their behavioral pattern, the fractures in the rock seam extended “in the direction of maximum geo-stress and then deflected toward the interface.” The fracture behavior in the coal seams could be divided into two patterns: “deflection toward the interface and then extension along the direction of maximum geo-stress” and “deviation from the interface and then extension along the direction of maximum geo-stress.” The mutual feedback between the fractures manifested in the form of fracture “phase direction” in the case of stratified fracturing and “phase back” in the case of simultaneous fracturing, i.e., the fracture behaviors in the rock seams and in the first type of coal seams were promoted whereas the fracture behavior was inhibited in the second type of coal seams. In addition, the second fracturing process could be characterized by an increase in the fracture initiation pressure, a decrease in the rate of pressure drop, an increase in the fracture extension duration, and a decrease in the fracture width. When using a fracturing sequence of rock followed by coal, the formation of the seam network structure was found to be more favorable. When using a fracturing sequence of coal followed by rock, it was necessary to continue the injection of the hydraulic fluid into the first fracture during the second fracturing process, so as to obtain a higher fracturing yield. This research provides a certain theoretical support for the efficient co-exploitation of three gases, namely coalbed methane, tight gas, and shale gas, from coal composite reservoirs and in the prevention of gas disasters.</div></div>","PeriodicalId":54941,"journal":{"name":"International Journal of Rock Mechanics and Mining Sciences","volume":"184 ","pages":"Article 105968"},"PeriodicalIF":7.0,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142660334","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental study on the interaction mechanism of two dynamic cracks under blasting loading","authors":"Linzhi Peng ,&nbsp;Zhongwen Yue ,&nbsp;Xu Wang ,&nbsp;Jun Zhou","doi":"10.1016/j.ijrmms.2024.105956","DOIUrl":"10.1016/j.ijrmms.2024.105956","url":null,"abstract":"<div><div>In this study, dynamic photomechanical blasting experiments were conducted to investigate the interaction mechanisms of dual cracks induced by explosions at different relative positions. The experimental results demonstrate that both cracks penetrate when the actual relative vertical distance at which the crack tips begin to interact is within 10 mm in the experimental group; however, when it exceeds 10 mm, the dual cracks finally expand in a relatively parallel manner. The relative horizontal distance has a weaker impact on the final fracture mode. When the dynamic cracks begin to interact, both the propagation speed of the crack tips and the stress intensity factor increase, the crack propagation angle increases, and the crack propagation path exhibits curved characteristics. Based on the final fracture states of the specimens, the interaction results of the crack tips can be classified into three categories: deflection without merging, curvilinear merging, and parallel overlapping without merging. Based on the results of dynamic photomechanical experiments and the relative verification theory of the crack-tip stress field in previous studies, an expression for the stress-field distribution between dynamic crack tips during interaction was proposed. During the interaction of dynamic blast-induced cracks, the stress intensity at crack tips increases to 1.3–1.5 times that at the onset of mutual interaction. The cracks initially repel each other. As the relative positions of the crack tips increased, the local stress weakened, and the repulsion phenomenon diminished accordingly. Consequently, after crack interaction, the cracks exhibited a spindle-shaped pattern.</div></div>","PeriodicalId":54941,"journal":{"name":"International Journal of Rock Mechanics and Mining Sciences","volume":"184 ","pages":"Article 105956"},"PeriodicalIF":7.0,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142660330","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}