三峡工程基础岩体泥化结构面力学性能研究

岩石力学试验参数的工程应用,必须充分考虑岩石的不均匀性和试件的代表性。为此,作者在三峡工程基岩泥化面力学性能的测试过程中,采取了两个措施。首先,对结构面充填物做了颗粒分析和矿物分析,将泥化面分成夹泥和夹绿帘石两种类型,分别进行成果整理。其次,据不同糙度情况,采用不同强度取值准则,并通过单点法和多点法相结合途径,使用了单点抗剪断强度参数计算方法。试验获得了如下成果:1、夹泥和夹绿帘石结构面的力学性能,包括抗剪强度上、下限值,残余强度下限值,切向和法向刚度;2、泥化面考虑糙度效应的本构方程。

Mechanical property tests of the weak discontinuities at the Three Gorges dam foundation

Helerogeneity of rock mass and representative of its samples must be fully consideredin engineering application of rock mechanical test parameters. So, the auther adopted two mea-sures in the process of mechanical behavior test of argillazation plane for foundation rock of theThree Gorges project. Firstly. granulometric analysis and mineralogical analysis of the structureplane fill were conducted. Two types, muddy intercalation and epidote intercalation, were divid-ed for the argillazation planes and their test results were sorted out respectively. Secondly. differ-ent criteria of strength value adoption were taken according to different conditions of roughness incombination with the integration of both single point method and multipoint method, calculationof single point shear strength parameters was used. The following test results were obtained: 1.mechanical behavior of structural plane for argillazation and epidote intercalation, including upperand lower limit of shear strength, lower limit of residual strength, tangential and normal rigidi-ty; 2. constitutive equation of argillazation plane paying respect to roughness effect.