核废料贮存裂隙岩体中THM耦合过程的有限元分析  

Finite-element method for the coupled Thermal-Hydro-Mechanical processed in fractured rocks surrounding nuclear waste repositories

作　　者：刘亚晨[1] 席道瑛 

机构地区：[1]中国科学技术大学地球与空间科学系,合肥230026 [2]福建省漳州市建设工程质量监督站,漳州363000

出　　处：《水文地质工程地质》2003年第3期81-87,共7页Hydrogeology & Engineering Geology

基　　金：国家自然科学基金资助(49772163)

摘　　要：本文首先给出了核废料贮存裂隙岩体中THM耦合作用的数学模型,然后用加权残数法,建立了以结点位移、水压力和温度为求解量的有限元计算格式,提出了数值模拟渗流、附加应力和热载耦合作用的有限元分析方法,最后给出了一个BMT1问题的算例。An important part of the safety analysis of nuclear waste storage is an assessment of the coupling of rock mass stability,tectonic stresses、ground water flow through the repository and thermal loading.To gain a proper understanding of coupled behavior of rock masses,considerable work is attempted to increase property understanding of the various aspects of coupled phenomenon involving thermal(T)、hydrological(H)、mechanical(M)processes in this paper,and analyzes the mechanical and permeable parameters properties for coupled thermohydromechanical processes in the fracture rock mass media to be treated as an equivalent continuum.Thereby we establish exploratory mathematical models by modeling coupled THM processes in the geologic media.The research results of this paper can be summarized as: On the aspect of mechanical behavior models of the fracture rock mass,mechanic function is described with the relationship between effective elastic moduli(dry or saturated cracks)of the fracture mass and elastic moduli of the rock,having been derived by O'Connell.According to the implication of the crackdensity parameter in the relationship,we derive mathematical relationship between the crackdensity and the fabric tensor introduced by Oda under temperature effect. As for models of hydraulic behavior,this paper makes a thorough study on aperture of rock joins、the number of open cracks after heating in rock mass、the fracture interconnectivity、tectonic stresses、the dilation due to shear sliding and chemical composition,and utilize fluid permeability tensor proposed by Oda,the tensor field of permeability in the fracture rock mass with coupled THM properties is derived. Depending on theory analyses,thermalhydromechanical coupling constitutive relationship and the definite equations in fractured rock mass are deduced. On the aspect of numerical analysis,the finiteelement formulae for coupled THM models are derived in this paper by utilizing theory of the weighted sur

关 键 词：核废料贮存裂隙岩体 THM耦合作用 数学模型 加权残数法 位移 水压力 温度 有限元分析方法 热载耦合作用 

分 类 号：TL942.21[核科学技术—辐射防护及环境保护]