Bulletin of Engineering Geology and the Environment最新文献

Effects of initial water and salt content on permeability and microstructure of sodic-saline loessal soils 初始含水量和含盐量对钠盐黄土渗透性和微观结构的影响

IF 3.7 2区工程技术

Bulletin of Engineering Geology and the Environment Pub Date : 2024-11-18 DOI: 10.1007/s10064-024-04006-z

Yan Xu, Fansheng Kong, Min Zhang, Hua Du, Shulin Dai, Zheyuan Zhang

{"title":"Effects of initial water and salt content on permeability and microstructure of sodic-saline loessal soils","authors":"Yan Xu, Fansheng Kong, Min Zhang, Hua Du, Shulin Dai, Zheyuan Zhang","doi":"10.1007/s10064-024-04006-z","DOIUrl":"10.1007/s10064-024-04006-z","url":null,"abstract":"<div>Dramatic changes in temperature and rainfall with global warming can significantly alter the moisture status of topsoil, thereby inducing soil structure degradation. However, few studies have reported the variation in permeability of saline soils during drying, which contributes to further refining the mechanism of wetting‒drying effect on soil properties. In this study, the permeability and microstructure of sodic-saline loessal soil with different initial water contents (IWCs) and salt contents (ISCs) obtained from pre-saturation and subsequent drying were explored using constant head permeability tests and SEM observations. The results show that the permeability coefficient decreases exponentially with time. The maximum permeability coefficient (Kmax) of the samples decreases with decreasing IWC and ISC, while the relatively stable permeability coefficient (Krs) is less affected. The microscopic results show that during the seepage process, the porosity and pore diameter of samples with low IWC gradually decrease, accompanied by a weakening of pore directionality and an increase in fractal dimension. In contrast, samples with high IWC show an initial increase followed by a decrease in porosity, pore diameter and pore directionality, alongside a gradual decrease in fractal dimension. The drying process promotes the formation of inter-aggregate pores and weakens aggregate stability, leading to significant microstructural disturbances in low IWC samples upon rewetting. The increase in salt content enhances particle cementation but also creates additional channels for rapid permeability. These findings carry practical implications for the prevention and control of soil erosion and engineering geohazards in saline soil regions under the impact of climate change.</div>","PeriodicalId":500,"journal":{"name":"Bulletin of Engineering Geology and the Environment","volume":"83 12","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664415","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental investigation and fractional elastoplastic damage constitutive modelling of gray sandstone under loading disturbance 加载扰动下灰质砂岩的实验研究和分部弹塑性损伤构成模型

IF 3.7 2区工程技术

Bulletin of Engineering Geology and the Environment Pub Date : 2024-11-16 DOI: 10.1007/s10064-024-03996-0

Xuelei Duan, Wei Wang, Shifan Liu, Rubin Wang, Yajun Cao, Qizhi Zhu, Kuan Zhang

{"title":"Experimental investigation and fractional elastoplastic damage constitutive modelling of gray sandstone under loading disturbance","authors":"Xuelei Duan, Wei Wang, Shifan Liu, Rubin Wang, Yajun Cao, Qizhi Zhu, Kuan Zhang","doi":"10.1007/s10064-024-03996-0","DOIUrl":"10.1007/s10064-024-03996-0","url":null,"abstract":"<div>The mechanical behavior and deformation characteristics of gray sandstone greatly affect the stability and safety of large-scale structural engineering on the rock stratum. A series of tests for sandstone collected from Jinping hydropower stations in southwest China under complex stress paths were carried out, including hydrostatic pressure test, conventional triaxial test, cyclic loading and unloading of deviatoric stress, confining pressure and pore pressure test. Meanwhile, a fractional elastoplastic damage model was proposed. The results show that the crack closure stress, crack initiation stress, and crack damage stress under conventional triaxial compression path are 0.189~0.217, 0.475~0.615, and 0.730~0.856 of peak stress, respectively. The influence of cyclic loading and unloading on mechanical behavior and deformation of gray sandstone has a significant strengthening effect. Under deviatoric stress cyclic loading and unloading, with increasing cycle number, axial and lateral strain increment curves tend to coincide, and the volumetric strain increment decreases. Under confining and pore pressure cyclic loading and unloading, the lateral strain increment is much larger than the axial strain increment. The axial elastic modulus and lateral elastic modulus show great discretization and irregularity. Moreover, a modulus-like axial coupling parameter is analyzed and discussed. The established constitutive model can accurately reflect the hardening and plastic dilatancy behavior of gray sandstone. Meanwhile, the staggered iterative return mapping algorithm is improved to ensure the convergence of the model.</div>","PeriodicalId":500,"journal":{"name":"Bulletin of Engineering Geology and the Environment","volume":"83 12","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142645699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Probabilistic landslide-generated impulse waves estimation in mountain reservoirs, a case study 山区水库滑坡脉冲波的概率估算，一项案例研究

IF 3.7 2区工程技术

Bulletin of Engineering Geology and the Environment Pub Date : 2024-11-14 DOI: 10.1007/s10064-024-04003-2

Hangsheng Ma, Huanling Wang, Hongjuan Shi, Weiya Xu, Jing Hou, Weiwei Wu, Wei-Chau Xie

{"title":"Probabilistic landslide-generated impulse waves estimation in mountain reservoirs, a case study","authors":"Hangsheng Ma, Huanling Wang, Hongjuan Shi, Weiya Xu, Jing Hou, Weiwei Wu, Wei-Chau Xie","doi":"10.1007/s10064-024-04003-2","DOIUrl":"10.1007/s10064-024-04003-2","url":null,"abstract":"<div>Landslide-generated impulse waves (LGIWs) in mountain reservoirs pose serious threats to dam safety. In this paper, the potential LGIWs hazard induced by the ZJ landslide is studied by combining a hybrid SPH-SWEs method and LSTM networks. The hybrid SPH-SWEs method is used to investigate the evolution process of LGIWs, including landslide sliding, impulse wave generation, wave propagation, and running up on the dam. The map of the maximum water level is obtained. Subsequently, 49 calculation samples with different sliding velocities and failure volumes are established using the hybrid model. Based on the numerical samples, the sensitivity of sliding velocities and failure volume on the runup height on the dam is studied, and a LSTM surrogate model is trained to conduct the probabilistic analysis. The results show that the LGIWs is significantly influenced by topography. The influence of sliding velocity on the runup height on the dam surface is greater than that of the failure volume in this case study. The runup height on the dam surface is concentrated between 5.9 m and 7.5 m with a percentage of 84%. The results demonstrate that the combination of the SPH-SWEs method and the LSTM surrogate model can effectively carry out the probabilistic estimation of LGIWs in mountain reservoirs. This study provides technical support for disaster prevention associated with the ZJ landslide and presents a valuable method for assessing the risk of LGIWs.</div>","PeriodicalId":500,"journal":{"name":"Bulletin of Engineering Geology and the Environment","volume":"83 12","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142636947","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A novel data-driven hybrid intelligent prediction model for reservoir landslide displacement 水库滑坡位移的新型数据驱动混合智能预测模型

IF 3.7 2区工程技术

Bulletin of Engineering Geology and the Environment Pub Date : 2024-11-13 DOI: 10.1007/s10064-024-03987-1

Dezhi Zai, Rui Pang, Bin Xu, Jun Liu

{"title":"A novel data-driven hybrid intelligent prediction model for reservoir landslide displacement","authors":"Dezhi Zai, Rui Pang, Bin Xu, Jun Liu","doi":"10.1007/s10064-024-03987-1","DOIUrl":"10.1007/s10064-024-03987-1","url":null,"abstract":"<div>Accurate and reliable displacement prediction is crucial for landslide monitoring and early warning. Landslide displacement data is complex nonlinear time series. Although some studies have employed dynamic models to predict landslide displacement, they have only focused on point displacement prediction, inevitably compromising the prediction credibility due to the inherent uncertainties in landslide prediction. This paper proposes a novel hybrid intelligent prediction model to enhance the prediction accuracy of point displacement in reservoir landslides and construct reliable displacement prediction intervals. Specifically, PSO-SVM is adopted to predict the trend displacement, while CNN-GRU-Attention is designed to predict the periodic displacement. Furthermore, the hybrid model allows for the direct construction of required displacement prediction intervals based on the landslide time series. The superior performance of the proposed model is proven by using the Baishuihe and Shuping landslides as case studies. The results demonstrate that the developed model achieves higher prediction accuracy and enables the construction of reliable displacement prediction intervals. Additionally, the proposed model can predict the time series of unknown displacement and provide an early warning of landslides at the early stage of displacement mutation. This research contributes to the improvement of landslide risk assessment and disaster early warning capabilities, providing reliable scientific guidance for landslide disaster prevention and mitigation.</div>","PeriodicalId":500,"journal":{"name":"Bulletin of Engineering Geology and the Environment","volume":"83 12","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142636824","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Proposed vulnerability assessment model for masonry buildings on slow-moving landslides based on physical models and field observations 基于物理模型和现场观测，提出了缓动滑坡中砌体建筑易损性评价模型

IF 4.2 2区工程技术

Bulletin of Engineering Geology and the Environment Pub Date : 2023-09-05 DOI: 10.1007/s10064-023-03385-z

Qin Chen, Renato Macciotta, Lixia Chen, Kunlong Yin, Lei Gui, Ye Li

{"title":"Proposed vulnerability assessment model for masonry buildings on slow-moving landslides based on physical models and field observations","authors":"Qin Chen, Renato Macciotta, Lixia Chen, Kunlong Yin, Lei Gui, Ye Li","doi":"10.1007/s10064-023-03385-z","DOIUrl":"10.1007/s10064-023-03385-z","url":null,"abstract":"<div>The collection of relevant information about the vulnerability of infrastructure damaged by landslides is not an easy task due to the existence of several compounding factors and uncertainties. This makes it difficult to quantitatively estimate their vulnerability to slow-moving landslides. This paper presents a new vulnerability assessment model for masonry buildings on slow-moving landslides based on physical models and field observations. A masonry building model is made of brick and concrete at a scale of 1:10 to physically simulate the damage in structures caused by ground tension cracks commonly developed on slow-moving landslides. The tension crack opening process is simulated through a load-controlled table with an aperture on which the building model is constructed. The strain on the wall and its foundation were measured, and the damage of the model (crack formation and evolution for each loading step) was collected, described, and analyzed. These data were used to develop failure criteria for masonry buildings in rural areas in China in terms of a quantitative vulnerability curve. The quantitative model of vulnerability for masonry structures was established based on fuzzy mathematics and the Weibull function applied on the test data and observations. The vulnerability curve is verified with field cases of masonry buildings damaged by ground tension cracks associated with slow-moving landslides in the Three Gorges Reservoir area. The results support further testing and use of vulnerability curve proposed.</div>","PeriodicalId":500,"journal":{"name":"Bulletin of Engineering Geology and the Environment","volume":"82 10","pages":""},"PeriodicalIF":4.2,"publicationDate":"2023-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4230927","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A frozen soil sampling technique for granular soils and thermal modeling 颗粒土冻土取样技术及热模拟

IF 4.2 2区工程技术

Bulletin of Engineering Geology and the Environment Pub Date : 2023-08-15 DOI: 10.1007/s10064-023-03372-4

Mostefa Hani, Burak Evirgen

{"title":"A frozen soil sampling technique for granular soils and thermal modeling","authors":"Mostefa Hani, Burak Evirgen","doi":"10.1007/s10064-023-03372-4","DOIUrl":"10.1007/s10064-023-03372-4","url":null,"abstract":"<div>This study uses a new sampling approach to allow undisturbed sampling without damaging the natural conditions of granular soils, thanks to the artificial ground freezing (AGF) method via a double-independent closed-circulation mechanism, over a 48-h period at ? 15 °C. The mechanical properties, textural characteristics, and freezing-thawing observations of three types of granular soils are investigated. The temperature distribution around freezing pipes, the shape of the frost line, and the degree of ice saturation were observed through a thermal simulation by a two-dimensional finite element analysis software, Plaxis 2D. The unconfined compressive strength and strain values of molded and cored specimens are compared. The coring samples are about 2.56 times stronger than the molded ones, depending on the method of soil sampling procedure in the same type of soil. The well-graded sandy samples (SW) achieve up to 1.05 and 2.95 MPa of force values in the molded and coring samples, respectively. Moreover, according to the types of soils, in the SW specimens, 1.57- and 1.39-fold strength values are obtained for poorly graded sand (SP) and well-graded gravel (GW) samples in the molded artificially frozen sampling process, respectively, as well as 1.17- and 1.09-fold strength increments in the coring frozen sampling process within the same order. The results of thermal module simulation nearly match those obtained using laboratory-based tests. The efficiency of the proposed sampling approach has been proven to represent actual on-site behavior. Besides, the strength results are perfect in this method with respect to traditional sampling methods.</div>","PeriodicalId":500,"journal":{"name":"Bulletin of Engineering Geology and the Environment","volume":"82 9","pages":""},"PeriodicalIF":4.2,"publicationDate":"2023-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4599424","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental study on ultrasonic characteristics of frozen sandstone under uniaxial compression 冻结砂岩单轴压缩超声特性试验研究

IF 4.2 2区工程技术

Bulletin of Engineering Geology and the Environment Pub Date : 2023-08-14 DOI: 10.1007/s10064-023-03343-9

Xihao Dong, Shuai Liu, Hailiang Jia

{"title":"Experimental study on ultrasonic characteristics of frozen sandstone under uniaxial compression","authors":"Xihao Dong, Shuai Liu, Hailiang Jia","doi":"10.1007/s10064-023-03343-9","DOIUrl":"10.1007/s10064-023-03343-9","url":null,"abstract":"<div>As one of the main means of non-destructive testing, ultrasonic waves?can effectively detect damage inside rock, which provides an important basis for the evaluation of rock mechanical properties. This study investigates the ultrasonic characteristics of frozen sandstone during loading and the effect of?different temperatures. Combined with the deformation and failure process of the?frozen sandstone sample, variation in ultrasonic velocity, amplitude, frequency spectrum, quality factor, and energy during loading were analyzed. The results show that (1) the amplitude of ultrasonic first?increased, then decreased, then increased again with the increase in axial stress ((sigma_{1})), and decreased with the decrease in temperature. (2) The amplitude and arrival time of the first wave decreased as the temperature decreased. The amplitude of the first wave increased with the increase in (sigma_{1}), while the arrival time is reversed. (3) The ultrasonic velocity ((v_{p})) increased as the temperature decreased. (v_{p}) increased rapidly in the compaction stage and increased slowly in the elastic stage. Before the peak stress, when the stress level of sandstone samples was 0.88–0.93, (v_{p}) reached its peak?and then decreased rapidly due to the initiation and expansion of cracks. (4) The spectral peaks increased with the increase in (sigma_{1}) and decreased with the decrease in temperature. In addition, the quality factor and accumulated energy of the?ultrasonic increase first and then decrease during loading. The relationship between the?ultrasonic velocity and stress of frozen sandstone at different temperatures was established using logarithmic function?fitting.</div>","PeriodicalId":500,"journal":{"name":"Bulletin of Engineering Geology and the Environment","volume":"82 9","pages":""},"PeriodicalIF":4.2,"publicationDate":"2023-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4857519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","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 the rock failure effect on overcoring stress relief test in deep hard rock 岩石破坏对深部硬岩覆岩应力释放试验的影响研究

IF 4.2 2区工程技术

Bulletin of Engineering Geology and the Environment Pub Date : 2023-08-14 DOI: 10.1007/s10064-023-03377-z

Minzong Zheng, Shaojun Li, Huaisheng Xu, Zhiqiang Liang, Xingan Lu

{"title":"Investigation of the rock failure effect on overcoring stress relief test in deep hard rock","authors":"Minzong Zheng, Shaojun Li, Huaisheng Xu, Zhiqiang Liang, Xingan Lu","doi":"10.1007/s10064-023-03377-z","DOIUrl":"10.1007/s10064-023-03377-z","url":null,"abstract":"<div>The failure of a rock core will result in the inaccuracy of in situ stress tests when the overcoring stress relief method is used in deep rock engineering. To investigate the stress test error caused by rock failure, stress test simulations under different loading conditions and post-peak parameters are designed and implemented. The results show that the stress measurement error increases exponentially as the degree of rock core failure increases. The greater the severity of the rock failure, the greater the estimation error of each stress component. The strain test error is the primary cause of stress test error, not the residual stress at the rock core. Based on this, the applicable conditions of the overcoring stress relief method are analyzed. To keep the stress test error within an acceptable range, the test borehole axis should be kept close to the direction of the maximum principal stress. Additionally, the fracture depth should be less than 0.2 times the radius of the pilot hole. This research will provide the basis for the error analysis of stress test results and optimization of a borehole drilling process for the overcoring stress relief method in deep hard rock engineering.</div>","PeriodicalId":500,"journal":{"name":"Bulletin of Engineering Geology and the Environment","volume":"82 9","pages":""},"PeriodicalIF":4.2,"publicationDate":"2023-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10064-023-03377-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4561936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Probabilistic slope stability analysis considering the non-stationary and spatially variable permeability under rainfall infiltration-redistribution 降雨入渗-再分布下考虑非平稳和空间可变渗透率的概率边坡稳定性分析

IF 4.2 2区工程技术

Bulletin of Engineering Geology and the Environment Pub Date : 2023-08-12 DOI: 10.1007/s10064-023-03351-9

Xueyou Li, Xian Liu, Yadong Liu, Zhiyong Yang, Limin Zhang

{"title":"Probabilistic slope stability analysis considering the non-stationary and spatially variable permeability under rainfall infiltration-redistribution","authors":"Xueyou Li, Xian Liu, Yadong Liu, Zhiyong Yang, Limin Zhang","doi":"10.1007/s10064-023-03351-9","DOIUrl":"10.1007/s10064-023-03351-9","url":null,"abstract":"<div>The non-stationary and spatially variable permeability ks can have a significant influence on the process of rainwater infiltration and redistribution in a soil slope and further affect the slope stability and the slope failure time after a rain event. However, there has been limited research on the influence of non-stationary and spatially variable ks on the stability and the failure time of soil slopes. This paper aims to investigate how the non-stationary and spatially variable ks affects the soil slope stability and the most probable failure time (MPFT) of the slope considering the rainwater infiltration and redistribution. To achieve this purpose, an integrated probabilistic analysis framework is proposed by coupling the non-stationary ks random field into a slope model for the probabilistic slope seepage analysis based on Monte Carlo simulations. An unsaturated soil slope subjected to rainfall is taken as an illustrative example to demonstrate the influence of non-stationary and spatially variable ks on the slope stability. The results show that the location of the slip surface with minimum factor of safety continuously changes during the process of the rainwater infiltration-redistribution. Ignoring the effect of decreasing trend of ks will result in an underestimation of the failure probability of slope even if the spatial variability of ks is considered. The MPFT of slope will be earlier if the non-stationary characteristics of ks is considered.</div>","PeriodicalId":500,"journal":{"name":"Bulletin of Engineering Geology and the Environment","volume":"82 9","pages":""},"PeriodicalIF":4.2,"publicationDate":"2023-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4787555","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

DEM investigation of the mechanical behavior of frozen soil along various stress paths 不同应力路径下冻土力学行为的DEM研究

IF 4.2 2区工程技术

Bulletin of Engineering Geology and the Environment Pub Date : 2023-08-12 DOI: 10.1007/s10064-023-03367-1

Ruohan Sun, Run Liu, Huan Zhang, Chun Liu, Chengfeng Li

{"title":"DEM investigation of the mechanical behavior of frozen soil along various stress paths","authors":"Ruohan Sun, Run Liu, Huan Zhang, Chun Liu, Chengfeng Li","doi":"10.1007/s10064-023-03367-1","DOIUrl":"10.1007/s10064-023-03367-1","url":null,"abstract":"<div>Understanding the mechanical characteristics of frozen soil is critical for engineering projects in cold regions. A series of case studies were conducted to explore the macroscopic and microscopic mechanical behavior of frozen soil during four different stress paths, i.e., isotropic, constant stress ratio, conventional triaxial, and true triaxial compression tests, using the distinct element method (DEM). The particle-scale mechanism and temperature effect of frozen soil are also taken into account in the DEM simulation. The results indicate that the peak stress/yield stress of frozen soil decreases with the increase of temperature or decrease of stress ratio or decrease of intermediate principal stress ratio b, which is related to the evolutions of bond breakage, bond stress, mechanical coordination number, and deviatoric fabric. When 0.25?≤?b?≤?0.75, the direction of strain increment deviates from the direction of stress. In addition, the relationship between the damage variable B and the volumetric strain εv or shear stain εs can be expressed as (B=1-mathrm{exp}(-acdot {varepsilon }_{v}^{n})) or (B=1-mathrm{exp}(-acdot {varepsilon }_{s}^{n})) under different stress paths. The simulation results and revealed microscopic mechanism will be valuable in developing breakage-mechanics-based constitutive models for frozen soil.</div>","PeriodicalId":500,"journal":{"name":"Bulletin of Engineering Geology and the Environment","volume":"82 9","pages":""},"PeriodicalIF":4.2,"publicationDate":"2023-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10064-023-03367-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4787554","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0