冻土旁压试验与单轴试验对比  

Comparison Between Pressuremeter Test and Uniaxial Compression Test of Frozen Soil

作　　者：张虎[1] 张建明[1] 苏凯[1] 刘世伟[1] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室,兰州730000

出　　处：《吉林大学学报（地球科学版）》2015年第5期1479-1484,共6页Journal of Jilin University：Earth Science Edition

基　　金：国家自然科学基金项目(40971045);冻土工程国家重点实验室自主研究课题(SKLFSE-ZY-02-6)

摘　　要：为了认识冻土旁压试验结果与常规试验结果之间的关系,在室内分别开展了冻结重塑黏土的旁压试验和单轴压缩试验,并对试验结果进行了对比分析。结果表明,在各级荷载作用下旁压曲线一般都呈现应变速率衰减的趋势,而单轴曲线在冻土破坏时会出现渐进流动阶段。旁压试验的应力-应变曲线呈现应变硬化型,而且出现初始拟弹性阶段;而单轴试验的应力-应变曲线则属于应变软化型,并在轴向应变大约为10%时达到剪应力峰值。温度相同时,旁压试验的剪切强度以及初始弹性模量都要大于单轴试验,且温度越低差值越大。In order to identify the relationship between pressuremeter tests and indoor tests,the pressuremeter tests and uniaxial tests were performed and the comparisons between the test results were analyzed.The results indicate that the pressuremeter creep curve presents a decaying form;while a progressive flow stage appears in the uniaxial test once the frozen soil is broken.The stress-strain curves of pressuremeter test manifest a strain-hardening character with an initial quasi-elastic stage;while the uniaxial test shows a strain-softening stress-strain curve with peak strength at the axial strain of 10%.At the same temperature,the shear strength as well as the initial deformation modulus of pressuremeter test are greater than those of uniaxial tests;and the difference increases with the decreasing of temperature.

关 键 词：旁压试验 单轴压缩试验 剪切强度 初始弹性模量 

分 类 号：TU413.3[建筑科学—岩土工程]