软岩多轴流变特性及其对拱坝的影响  

RHEOLOGICAL PROPERTY OF SOFT ROCK UNDER MULTIAXIAL COMPRESSION AND ITS EFFECT ON DESIGN OF ARCH DAM

作　　者：刘光廷[1] 胡昱[1] 陈凤岐[1] 徐增辉[1] 

机构地区：[1]清华大学水利水电工程系,北京100084

出　　处：《岩石力学与工程学报》2004年第8期1237-1241,共5页Chinese Journal of Rock Mechanics and Engineering

基　　金：清华大学"985"科研基金项目

摘　　要：尝试利用多轴非线性流变模型,将砾岩在多轴应力条件下的流变试验成果应用于实际工程,使仿真数值计算结果更接近实际情况。与干燥状态相比,泡水后软岩除了瞬时变形模量大幅度降低外,流变也很显著,这会对坝体应力带来明显的影响。考虑了侧压对岩石流变的影响,由于侧压作用,软岩流变减少,拱坝拉应力区域缩减,拉应力值也有一定程度的降低。A nonlinear model and multiaxial rheological experiment results of soft rock are applied to practice,and the simulation agrees well with the reality. The deformation modulus decreases evidently and the nonlinear rheological property is more significant when the rock is immersed,which will affect the stress distribution of arch dams. In addition,it is found that the rheology of soft rock decreases with lateral pressure,so that the stress state of arch dam is improved.

关 键 词：岩石力学 软岩 多轴试验 非线性 流变特性 拱坝 变形模量 

分 类 号：TV223.1[水利工程—水工结构工程] TV642.4