Pub Date : 2026-03-15DOI: 10.1016/j.enggeo.2026.108678
Yufeng Wang, Qiang Wang, Jinzhou Zhao, Yongquan Hu, Jianglong Wang, Juhui Zhu, Rong Wang, Xiaowei Li, Yu Yang
In this study, a coupled modeling framework is developed by integrating an embedded discrete fracture-finite volume poroelastic geomechanics model with a finite-discrete element fracture propagation model. This coupled system enables a rigorous investigation of the spatialtemporal evolution of the in-situ stress field, fracture propagation behavior, and interwell frac-hit mechanisms under various geological conditions. The proposed framework is validated against analytical solutions and commercial simulators. Results show that with increasing production time, the maximum and minimum principal stresses initially decrease and subsequently recover, whereas the shear stress and the rotation angle of the maximum principal stress first increase and then diminish. Higher reservoir permeability and a larger horizontal stress difference accelerate stress reversal, enlarge the reversal zone, and increase the rate of stress evolution. As parent-well production continues, infill-well hydraulic fractures tend to deflect toward the parent well, enhancing longitudinal asymmetry and increasing frac-hit risks, which are reflected by larger pressure increment magnitudes and shorter response times. These trends remain consistent across different stress-difference and permeability conditions. During the early production stage, lower permeability or a smaller stress difference leads to slower stress reorientation and smaller fracture-path deviation. During mid-production, pronounced stress reversal restricts vertical fracture propagation and suppresses direct interwell connection. In late production, frac-hits becomes inevitable, especially in high-permeability or high-stress-difference reservoirs, where longitudinal fracture asymmetry intensifies and pressure increments peak. Consequently, an optimal stimulation timing window for infill wells is identified, within which reservoir stimulation is maximized while mitigating frac-hit risks. Higher permeability shifts the optimal fracturing time earlier, whereas a smaller stress difference delays stress restoration and shifts the optimal timing later.
{"title":"Numerical simulation of fracture propagation and interwell frac-hit mechanism in deep shale gas infill wells","authors":"Yufeng Wang, Qiang Wang, Jinzhou Zhao, Yongquan Hu, Jianglong Wang, Juhui Zhu, Rong Wang, Xiaowei Li, Yu Yang","doi":"10.1016/j.enggeo.2026.108678","DOIUrl":"https://doi.org/10.1016/j.enggeo.2026.108678","url":null,"abstract":"In this study, a coupled modeling framework is developed by integrating an embedded discrete fracture-finite volume poroelastic geomechanics model with a finite-discrete element fracture propagation model. This coupled system enables a rigorous investigation of the spatialtemporal evolution of the in-situ stress field, fracture propagation behavior, and interwell frac-hit mechanisms under various geological conditions. The proposed framework is validated against analytical solutions and commercial simulators. Results show that with increasing production time, the maximum and minimum principal stresses initially decrease and subsequently recover, whereas the shear stress and the rotation angle of the maximum principal stress first increase and then diminish. Higher reservoir permeability and a larger horizontal stress difference accelerate stress reversal, enlarge the reversal zone, and increase the rate of stress evolution. As parent-well production continues, infill-well hydraulic fractures tend to deflect toward the parent well, enhancing longitudinal asymmetry and increasing frac-hit risks, which are reflected by larger pressure increment magnitudes and shorter response times. These trends remain consistent across different stress-difference and permeability conditions. During the early production stage, lower permeability or a smaller stress difference leads to slower stress reorientation and smaller fracture-path deviation. During mid-production, pronounced stress reversal restricts vertical fracture propagation and suppresses direct interwell connection. In late production, frac-hits becomes inevitable, especially in high-permeability or high-stress-difference reservoirs, where longitudinal fracture asymmetry intensifies and pressure increments peak. Consequently, an optimal stimulation timing window for infill wells is identified, within which reservoir stimulation is maximized while mitigating frac-hit risks. Higher permeability shifts the optimal fracturing time earlier, whereas a smaller stress difference delays stress restoration and shifts the optimal timing later.","PeriodicalId":11567,"journal":{"name":"Engineering Geology","volume":"107 1","pages":""},"PeriodicalIF":7.4,"publicationDate":"2026-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147465054","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}
Pub Date : 2026-03-14DOI: 10.1016/j.enggeo.2026.108667
Raffaele Spielmann, Jordan Aaron
{"title":"How well can we measure peak discharge and volume? Instantaneous 3D LiDAR measurements of multiple debris flows at three locations along a channel","authors":"Raffaele Spielmann, Jordan Aaron","doi":"10.1016/j.enggeo.2026.108667","DOIUrl":"https://doi.org/10.1016/j.enggeo.2026.108667","url":null,"abstract":"","PeriodicalId":11567,"journal":{"name":"Engineering Geology","volume":"10 1","pages":""},"PeriodicalIF":7.4,"publicationDate":"2026-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147447902","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}
The initial shear modulus (G0) is a key engineering geological parameter that influences geohazards such as soil collapse and slope failure. G0 is affected by soil structure, mineral composition, and degree of saturation. In tropical and subtropical regions, residual soils near the ground surface commonly exist under unsaturated conditions, where G0 may vary significantly with changes in soil suction. Therefore, understanding the relationship between G0 and soil suction is crucial for geological and geotechnical engineering, particularly for small-strain deformation and ground response analysis. Although numerous mathematical models have been proposed to describe G0, most are empirical in nature. In this study, a new spring-based method is proposed to estimate the G0 of unsaturated soils based on the stiffness contributions of dry and wet soil fractions. The dry and wet fractions are assumed to be randomly distributed within the soil matrix, and a statistical approach is employed to evaluate the probability of connectivity between different fractions. The proposed method is validated using 45 sets of experimental data collected from 13 published studies. The results show good agreement between the predicted and measured G0 values across various soil types and conditions. Owing to its spring-based formulation, the proposed approach can be regarded as a physically informed empirical model for estimating the initial shear modulus of unsaturated soils.
{"title":"Estimation of the initial shear modulus of unsaturated soil from soil-water characteristic curve","authors":"Qian Zhai, Yuhui Chen, Harianto Rahardjo, Alfrendo Satyanaga, Guoliang Dai, Weimin Gong, Xueliang Zhao, Liangzhong Qian","doi":"10.1016/j.enggeo.2026.108674","DOIUrl":"https://doi.org/10.1016/j.enggeo.2026.108674","url":null,"abstract":"The initial shear modulus (<ce:italic>G</ce:italic><ce:inf loc=\"post\">0</ce:inf>) is a key engineering geological parameter that influences geohazards such as soil collapse and slope failure. <ce:italic>G</ce:italic><ce:inf loc=\"post\">0</ce:inf> is affected by soil structure, mineral composition, and degree of saturation. In tropical and subtropical regions, residual soils near the ground surface commonly exist under unsaturated conditions, where <ce:italic>G</ce:italic><ce:inf loc=\"post\">0</ce:inf> may vary significantly with changes in soil suction. Therefore, understanding the relationship between <ce:italic>G</ce:italic><ce:inf loc=\"post\">0</ce:inf> and soil suction is crucial for geological and geotechnical engineering, particularly for small-strain deformation and ground response analysis. Although numerous mathematical models have been proposed to describe <ce:italic>G</ce:italic><ce:inf loc=\"post\">0</ce:inf>, most are empirical in nature. In this study, a new spring-based method is proposed to estimate the <ce:italic>G</ce:italic><ce:inf loc=\"post\">0</ce:inf> of unsaturated soils based on the stiffness contributions of dry and wet soil fractions. The dry and wet fractions are assumed to be randomly distributed within the soil matrix, and a statistical approach is employed to evaluate the probability of connectivity between different fractions. The proposed method is validated using 45 sets of experimental data collected from 13 published studies. The results show good agreement between the predicted and measured <ce:italic>G</ce:italic><ce:inf loc=\"post\">0</ce:inf> values across various soil types and conditions. Owing to its spring-based formulation, the proposed approach can be regarded as a physically informed empirical model for estimating the initial shear modulus of unsaturated soils.","PeriodicalId":11567,"journal":{"name":"Engineering Geology","volume":"130 1","pages":""},"PeriodicalIF":7.4,"publicationDate":"2026-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147465057","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":"Development and hypermobility of the Basu rock avalanche in the Nu River ophiolitic mélange, southeastern Tibetan Plateau","authors":"Yunjian Gao, Jianhui Deng, Siyuan Zhao, C.F. Lee, Xin Yao, Fuchu Dai, Stuart Lane, Yongbo Tie, Kaiyu Ren, Fei Wang, Ziguo Fu","doi":"10.1016/j.enggeo.2026.108685","DOIUrl":"https://doi.org/10.1016/j.enggeo.2026.108685","url":null,"abstract":"","PeriodicalId":11567,"journal":{"name":"Engineering Geology","volume":"97 1","pages":""},"PeriodicalIF":7.4,"publicationDate":"2026-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147447906","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}
Pub Date : 2026-03-13DOI: 10.1016/j.enggeo.2026.108681
Sabatino Cuomo, Angela Di Perna, Rita Ciaglia, Mariagiovanna Moscariello, Mario Martinelli
{"title":"Impact of flow-like landslide on protection barrier: Centrifuge Tests and MPM modelling","authors":"Sabatino Cuomo, Angela Di Perna, Rita Ciaglia, Mariagiovanna Moscariello, Mario Martinelli","doi":"10.1016/j.enggeo.2026.108681","DOIUrl":"https://doi.org/10.1016/j.enggeo.2026.108681","url":null,"abstract":"","PeriodicalId":11567,"journal":{"name":"Engineering Geology","volume":"41 1","pages":""},"PeriodicalIF":7.4,"publicationDate":"2026-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147447916","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}
Pub Date : 2026-03-13DOI: 10.1016/j.enggeo.2026.108680
Huan Liu, Hanbo Zhu, Rongxing He, Hang Zhang, Xiaolu Sun
{"title":"Nonlinear coupling relationship of rock point load index with uniaxial compressive and tensile strengths","authors":"Huan Liu, Hanbo Zhu, Rongxing He, Hang Zhang, Xiaolu Sun","doi":"10.1016/j.enggeo.2026.108680","DOIUrl":"https://doi.org/10.1016/j.enggeo.2026.108680","url":null,"abstract":"","PeriodicalId":11567,"journal":{"name":"Engineering Geology","volume":"26 1","pages":""},"PeriodicalIF":7.4,"publicationDate":"2026-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147447909","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}
Pub Date : 2026-03-12DOI: 10.1016/j.enggeo.2026.108683
Meiman Zhang, Hai Zhu, Mengtian Wu, Pengcheng Xu, Jianjun Han, Youming Zhang, Tianyu Lei, Lingling Wang
{"title":"From black box to physical insight: An explainable machine learning framework for dam break forecasting validated by numerical and physical tests","authors":"Meiman Zhang, Hai Zhu, Mengtian Wu, Pengcheng Xu, Jianjun Han, Youming Zhang, Tianyu Lei, Lingling Wang","doi":"10.1016/j.enggeo.2026.108683","DOIUrl":"https://doi.org/10.1016/j.enggeo.2026.108683","url":null,"abstract":"","PeriodicalId":11567,"journal":{"name":"Engineering Geology","volume":"62 1","pages":""},"PeriodicalIF":7.4,"publicationDate":"2026-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147447920","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}
Pub Date : 2026-03-12DOI: 10.1016/j.enggeo.2026.108682
Hanlin Li, Xiaoguang Jin, Jie He, Chao Hou, Wei Chen
{"title":"Instability evolutionary characteristic of colluvial landslide based on the 3D deformation field and curvature Shannon entropy in physical model test","authors":"Hanlin Li, Xiaoguang Jin, Jie He, Chao Hou, Wei Chen","doi":"10.1016/j.enggeo.2026.108682","DOIUrl":"https://doi.org/10.1016/j.enggeo.2026.108682","url":null,"abstract":"","PeriodicalId":11567,"journal":{"name":"Engineering Geology","volume":"30 1","pages":""},"PeriodicalIF":7.4,"publicationDate":"2026-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147447914","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}
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