花岗岩蚀变土力学特性试验研究  

Experimental study on mechanical properties of altered granite

作　　者：康文献 周进[2] 张瑞旗 

机构地区：[1]河南卓越建设工程有限公司,郑州450016 [2]华北水利水电大学,郑州450045

出　　处：《工程勘察》2016年第9期6-10,29,共6页Geotechnical Investigation & Surveying

基　　金：河南省科技创新人才计划项目(154100510006);河南省重点科技攻关项目(152102210111);新疆维吾尔自治区科技援疆项目(201491105);新疆自治区高层次人才引进工程

摘　　要：本文以抽水蓄能电站工程区花岗岩蚀变土为对象,掌握其基本物性指标,并探讨该土体作为坝体填筑材料在95%压实系数下渗透、变形和强度等特性,进一步分析和计算了试样的应力应变关系及邓肯—张模型参数。试验结果表明:当试样压实系数为95%时,属于低渗透性,中等压缩性,且有一定的粘聚力及较高的内摩擦角;其应力应变表现出硬化特性,剪切初期表现出剪缩性,当应变达到某一定值后,表现出剪胀特性;利用邓肯—张模型能较好地反应土体的应力应变本构关系,并确定相关参数。研究成果为实际工程中利用花岗岩蚀变土提供了参考依据。The study is carried out on granite altered soil in the project site of pumped storage power station. Its basic physical property indexes are obtained,and the other properties such as seepage,deformation and strength of the compacted dam filling material with 95% compaction factor are discussed.The stress-strain relationship of the specimen and the parameters of Duncan-Chang model are analyzed and calculated. The results show that the sample with a compaction coefficient of 95% is low in permeability,medium in compressibility,and a little cohesive and with relatively high internal friction angle; the stressstrain character is a hardening type,shear shrinkage occurs at the early stage and shear expansion appears when the strain reached a certain value; the stress-strain relationship of soils is simulated well with Duncan-Chang model and the relative parameters can be determined. The study results could provide a basis for the use of granite altered soil.

关 键 词：花岗岩蚀变土 力学特性 应力应变特性 邓肯—张模型 

分 类 号：TU41[建筑科学—岩土工程]