花岗岩残积土应力路径试验研究  

EXPERIMENTAL RESEARCH ON STRESS PATHS OF GRANITE RESIDUAL SOIL

作　　者：陈伟文 陈志波[1] 刘胜 韦毅 

机构地区：[1]福州大学环境与资源学院资源与城乡建设系,福州350116 [2]地质工程福建省高校工程研究中心,福州350116 [3]国土资源部丘陵山地地质灾害防治重点实验室,福州350116

出　　处：《工业建筑》2017年第12期11-16,共6页Industrial Construction

基　　金：福建省自然科学基金(2017J01481);国土资源部丘陵山地地质灾害防治重点实验室开放基金(ZY-2017-16);河海大学岩土力学与堤坝工程教育部重点实验室开放基金(2016003)

摘　　要：由于常规的三轴剪切试验不能反映实际工程中多种应力路径对土体力学特性的影响,以福州地区花岗岩残积砾质黏性土为研究对象,进行了常规三轴固结排水剪切试验、K0固结排水剪切试验、K0固结侧向减载试验和K0固结侧向减载轴向加载试验等多种室内试验,对不同应力路径条件下土体的抗剪强度、应力与应变的变化情况做出比较分析,总结了花岗岩残积土在复杂应力路径下土体的变形特性及强度特征。研究表明:在不同的土体应力路径情况下,土体所对应的强度参数及变形参数具有明显的差异性,花岗岩残积土在不同的应力路径情况下应力-应变曲线均呈现应变硬化型,在实际工程中,应综合考虑各种工况,以应对土体强度及变形的变化对工程进展的影响。In engineering practice,conventional triaxial tests cannot reflect the effects of various stress paths on the mechanical behavior of granite residual soil.Taking granite residual gravel clay in Fuzhou area as research object,the four types of tests,including triaxial consolidated drained shear test,K0-consolidation drained shear test,the lateral unloading K0-consolidation test and the lateral unloading axial loading K0-consolidation test,were carried out.The stress-strain curves and shear strength were studied under various stress paths,and the characteristics of strength and deformation of granite residual soil under different stress paths were summarized.The test results showed that the parameters of strength and deformation under different stress paths were obviously different.In engineering practice,various working conditions should be considered in order to cope with the influence of soil strength and deformation on the progress of the project.

关 键 词：应力路径 花岗岩残积土 力学性状 K0固结 各向异性 

分 类 号：TU41[建筑科学—岩土工程]