摘要
为研究液-热-力三场耦合作用下深地工程岩体裂纹扩展演化机理,基于现有裂纹扩展模拟优势软件FRACOD,进一步研发了液-热-力(H-T-M)耦合模块。此模块采用间接边界元-位移不连续法进行力学数值计算(岩体的变形和裂纹扩展)和瞬态热流模拟,用迭代法模拟裂纹扩展过程。通过地热能开发、地下天然气液化存储工程案例进行分析验证。模拟结果表明:(1)注入的流体温度与围岩温度不同时,流体在裂隙中流动引起热交换,在岩体内部产生温度压力,促进了裂纹扩展;(2)冰膨胀对岩石应力的影响随着裂隙孔径的增加而增大,所产生的压应力使岩体中的裂隙闭合,降低了流体泄露的风险。得到的试验结果能够清晰地反映出裂纹、不连续面及其扩展过程和演化规律,验证了该模块的可行性和优越性。
In order to study the crack propagation evolution mechanism of rock mass in deep engineering under the hydraulic-thermal-mechanical coupling function,a hydraulic-thermal-mechanical(H-T-M)coupling module was further developed based on the FRACOD software for crack propagation simulation.The mechanical numerical calculations(including deformation and crack propagation of rock mass)and transient heat flow simulation of the module were carried out through indirect boundary element and discontinuous displacement method,and the crack propagation process was simulated by iterative method.Then,the module was analyzed and verified through the development of geothermal energy and the case of underground natural gas liquefaction storage engineering.The results show that when the temperature of the injected fluid is different from the temperature of the surrounding rock,the fluid flowing in the cracks would cause heat exchange,then,would produce temperature pressure inside the rock mass,promoting crack propagation.The influence of ice expansion on rock stress increases with the increase of the crack aperture,which would produce compressive stress to close the cracks in the rock mass to reduce the risk of fluid leakage.The obtained experimental results can clearly reflect the cracks and discontinuity surface,as well as their propagation process and evolution laws,verifying the feasibility and superiority of the module.
作者
沈宝堂
孟文航
张士川
陈兵
SHEN Baotang;MENG Wenhang;ZHANG Shichuan;CHEN Bing(State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology,Shandong University of Science and Technology;CSIRO Mineral Resources,Queensland Centre for Advanced Technologies)
出处
《矿业研究与开发》
CAS
北大核心
2021年第11期76-81,共6页
Mining Research and Development
基金
国家自然科学基金面上项目(51974173)
山东省重点研发计划项目(2019GSF111024)
泰山学者优势特色学科人才团队支持计划项目。
关键词
FRACOD
裂纹扩展
液-热-力耦合
数值模拟
FRACOD
Crack propagation
Hydraulic-mechanical-thermal coupling
Numerical Simulation
