三种红层岩石常规三轴压缩下的强度与变形特性研究  

STRENGTH AND DEFORMATION OF THREE TYPES OF RED BEDS UNDER CONVENTIONAL TRIAXIAL COMPRESSION

作　　者：周应华[1] 周德培[1] 封志军[1] 

机构地区：[1]西南交通大学土木工程学院,成都610031

出　　处：《工程地质学报》2005年第4期477-480,共4页Journal of Engineering Geology

基　　金：交通部西部交通建设科技项目"红层软岩地区公路修建技术研究"(合同号:2002-318-000-26)

摘　　要：利用MTS815Teststar程控伺服岩石力学试验系统研究了川东地区一红层边坡中的砂岩、粉砂岩和泥岩围压为0～3MPa的应力-应变全过程曲线,建立了峰值强度、峰值强度前弹性模量以及峰值强度后的弹性模量和围压的关系.将低围压下红层的全应力-应变曲线概化成5个阶段,分别为压密段、弹性段、屈服段、应变软化段和塑性流动阶段.试验结果得出,红层弹性模量随围压的增加而提高且变化明显,砂岩和粉砂岩在此围压内为脆性破坏,泥岩为塑性破坏的规律.Complete stress-strain curves for sandstone, siltstone and mudstone in a red bed slope from east Sichuan province are obtained were obtained under confining pressures from 0 to 3 MPa using MTS815 Teststar, a rock mechanics servo system. The results showed that peak strength, with the confining pressure. The complete stress -strain curves can be tic, yield, strain softening pressure. Brittle failure is yield strength and relaxation modulus vary divided into five phases： compacting, elastic, yield, strain softening and plastic flow. Elasticity modulus of the red bed increases rapidly with the confining pressure. Brittle failure is observed in sandstone and siltstone, while plastic failure is observed in mudstone.

关 键 词：红层 三轴试验 峰值强度 弹性模量 全过程曲线 

分 类 号：TU411.6[建筑科学—岩土工程]