Multiscale modeling of gas-induced fracturing in anisotropic clayey rocks
作者机构：State Key Laboratory of Hydraulics and Mountain River EngineeringCollege of Water Resource and HydropowerSichuan UniversityChengdu610042China School of Resources and Safety EngineeringWuhan Institute of TechnologyWuhan430073China School of Civil EngineeringWuhan UniversityWuhan430072China State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground EngineeringChina University of Mining and TechnologyXuzhou221116China
出 版 物：《Journal of Rock Mechanics and Geotechnical Engineering》 (岩石力学与岩土工程学报（英文版）)
年 卷 期：2024年第16卷第6期
页 面：2091-2110页
核心收录：
学科分类：08[工学] 0815[工学-水利工程] 081503[工学-水工结构工程]
基 金：financially supported by the National Natural Science Foundation of China(Grant Nos.12302503 and U20A20266) Scientific and Technological Research Projects in Sichuan Province,China(Grant No.2023ZYD0154)
主 题：Deep geological repositories Mode-I microcracks Time-dependent damage Fracturing process Anisotropic rock
摘 要：In the context of repositories for nuclear waste,understanding the behavior of gas migration through clayey rocks with inherent anisotropy is crucial for assessing the safety of geological disposal *** primary mechanism for gas breakthrough is the opening of micro-fractures due to high gas *** occurs at gas pressures lower than the combined strength of the rock and its minimum principal stress under external loading *** investigate the mechanism of microscale mode-I ruptures,it is essential to incorporate a multiscale approach that includes subcritical microcracks in the modeling *** this contribution,we derive the model from microstructures that contain periodically distributed microcracks within a porous *** damage evolution law is coupled with the macroscopic poroelastic system by employing the asymptotic homogenization method and considering the inherent hydro-mechanical(HM)anisotropy at the *** resulting permeability change induced by fracture opening is implicitly integrated into the gas flow *** examples are presented to validate the developed model step by *** analysis of local macroscopic response is undertaken to underscore the influence of factors such as strain rate,initial damage,and applied stress,on the gas migration *** examples of direct tension tests are used to demonstrate the model’s efficacy in describing localized failure ***,the simulation results for preferential gas flow reveal the robustness of the two-scale model in explicitly depicting gas-induced fracturing in anisotropic clayey *** model successfully captures the common behaviors observed in laboratory experiments,such as a sudden drop in gas injection pressure,rapid build-up of downstream gas pressure,and steady-state gas flow following gas breakthrough.
维普期刊数据库