结构面剪切流变及其长期强度试验研究  

Shear creep and long-term strength test research on unconformity plane

作　　者：庞正江[1] 胡建敏[1] 

机构地区：[1]长江科学院岩基研究所,湖北武汉430010

出　　处：《岩土力学》2006年第S2期1179-1182,共4页Rock and Soil Mechanics

摘　　要：针对某电站典型代表性的岩层,进行室内岩石剪切流变试验,对岩块在剪切变形过程中的流变特性进行深入研究,选取扩展的 Burgers 模型建立流变方程,用 MATLAB 工具函数 fminsearch 拟合试验得到的μ-t 非线性函数流变曲线,确定岩体结构面的流变参数,并根据剪切流变试验确定其长期剪切强度。相对瞬时剪切强度,用长期强度进行设计更能保证工程的安全。In view of typical representative rock layer in a power plant,the rock sheafing creep indoor test is carded out,to research creep characteristic in the rock mass shear failure process.This article selects the extended Burgers model to establish sheafing creep equation;and uses the MATLAB tool function fminsearch to fit the nonlinear relation between U and t according to sheafing creep test;determines creep parameters of structural plane in the rock mass;and determines its long-term shearing strength according to the direct shear test.Compared to the instant sheafing strength,using the long-term strength in design is more reliable to guarantee the project security.

关 键 词：剪切流变 扩展的Burgers模型 非线性函数曲线拟合 瞬时剪切强度 长期强度 

分 类 号：TU458~.3[建筑科学—岩土工程]