岩体结构类型与水力学模型

 岩体水力学是一门研究岩体内一定温度条件下渗透力与应力相互作用关系及其耦合作用对岩体及岩体工程稳定性影响的交叉学科。为了准确描述岩体的水力学问题, 定义了有关名词。依据岩体的水力学特征, 把岩体的结构分为五类, 即: 准孔隙连续介质、裂隙网络介质、双重介质、岩溶管道网络介质以及岩溶溶隙- 管道介质。以岩体结构类型、达西定律、立方定律等为基础, 推导了在变温度和变应力条件下的孔隙型、裂隙型及管道型岩体的渗透定理, 并将岩体渗流场、温度场与应力场耦合模型分为两大类, 即: 集中参数型模型和分布参数型模型。

TYPES OF ROCK MASS STRUCTURE AND HYDROMECHANICAL MODELS IN ROCK MASS

Rock mass hydraulics is a new discipline for studying the interaction between seepage forces and stress with variable geotemperature in rock mass and effects of those coupled forces on stability of rock mass or engineering.In order to describe hydromechanical characteristic of rock mass,some basic concepts are defined. According to site investigation,the void structure of rock mass can be classified as six types,namely pore structure,sparse fracture network structure,dense fracture network structure,structure combining sparse fracture network with pore solid,structure combining dense fracture network with sparse fracture network,and structure combining fractures with conduits in karst.On the basis of hydromechanical characteristic of rock mass,the rock mass structure can be conceptualized as five types,namely quasi-pore continuum,fracture network medium,double porosity media,conduit network medium in karst,and fracture and conduit media in karst.Based on structural types of rock mass,the seepage laws of pore rock mass,fractured rock mass and conduit in karst rock mass are presented,in which the laws take into account the effects of changing stress and temperature,From practical application point view,the models of coupled stress,seepage and temperature fields in rock mass can be classified as two types,that is lumped parameter model and distributed parameter model.The former includes multi-variable auto-regression model,artificial neutral network model, and nonlinear chaos dynamical model. The latter includes continuum model, equivalent continuum model,fracture network model, double porosity media model,and generalized double porosity media model.