裂隙贯通率对双重孔隙介质热-水-应力耦合现象影响的有限元分析  

Finite element analyses of effects of fracture continuity rate on thermo-hydro-mechanical coupling in dual-porosity medium

作　　者：张玉军[1] 张维庆[2] 

机构地区：[1]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,武汉430071 [2]西南交通大学土木工程学院,成都610031

出　　处：《岩土力学》2011年第12期3743-3750,共8页Rock and Soil Mechanics

基　　金：国家自然科学基金资助项目(No.51079145);国家重点基础研究发展计划(973)资助项目(No.2010CB732101)

摘　　要：为探讨裂隙的贯通率对于耦合的温度场、渗流场和应力场的作用,应用所建立的遍有节理岩体双重孔隙-裂隙介质热-水-应力耦合模型,以一个假定的位于非饱和地层中的高放废物地质处置库为算例,针对裂隙和孔隙的贯通率不同的4种工况进行了二维有限元数值分析,考察了围岩中的温度、负的孔隙和裂隙水压力、地下水流速、孔隙及裂隙的渗透系数修正因子和应力的变化、分布情况。结果显示,由于裂隙贯通率的差异使得双重介质的刚度不同,引起岩体中应力状态及水平的改变,从而影响到孔隙、裂隙的孔隙率及渗透系数的量值,并导致孔隙水和裂隙水的压力大小、分布以及水流速度的变化。In order to probe into the effects of fracture continuity rate on coupled temperature field,seepage field and stress field,using the coupled thermo-hydro-mechanical model of dual-porosity medium for ubiquitous-joint rock mass established by the authors and taking a hypothetical nuclear waste repository located in an unsaturated stratum as a calculation example,the two-dimensional finite element analyses were carried out for four cases in which the continuity rates of fracture and pore are different;and the temperatures,negitive pore and fracture water pressures,flow velocities of groundwater,permeability correction factors for pore and fracture and stresses in the surrounding rock mass were investigated in the numerical simulation.The results show that the stiffness of dual-porosity medium is changed because of using different fracture continuity rates;so the state and level of stresses in the rock mass are modified,and then the porosity and permeability of pore and fracture are altered;therefore the variations of values,distributions of pore and fracture pressures as well as water flow velocities are caused.

关 键 词：裂隙贯通率 双重孔隙-裂隙介质 热-水-应力耦合 有限元分析 

分 类 号：O242.21[理学—计算数学]