黄土无侧限抗压强度的试验研究  

Experimental Research on Unconfined Compression Strength of Loess

作　　者：高建伟[1] 余宏明[1] 李科[1] 

机构地区：[1]中国地质大学工程学院,湖北武汉430074

出　　处：《安全与环境工程》2014年第4期132-137,共6页Safety and Environmental Engineering

基　　金：国家自然科学基金项目(41272377)

摘　　要：为了研究黄土填料无侧限抗压强度特性随其含水率、干密度的变化规律,本文对22种不同含水率、干密度组合的黄土试样进行了室内无侧限抗压强度试验,通过对试验数据及应力-应变曲线的分析,分别研究了黄土试样的无侧限抗压强度、弹性模量与含水率、干密度的关系。结果表明:同一含水率下,随着干密度的增加,黄土试样的无侧限抗压强度和弹性模量呈线性增长,且其增长速率随含水率增加而线性降低;同一干密度下,随着含水率的增加,黄土试样的无侧限抗压强度以二次函数的形式衰减,当黄土试样含水率为16%以上时,其衰减速率变缓,黄土试样无侧限抗压强度值基本处于同一水平,而黄土试样的弹性模量随含水率增加而线性降低,降低速率随干密度的增加而呈线性增长;黄土试样的无侧限抗压强度与弹性模量之间具有良好的线性相关性。该研究可为黄土作为建筑填料时的施工安全提供科学依据。For the purpose of studying the varying pattern of the unconfined compressive strength（UCS）of loess with the changes of water content and dry density,this paper makes indoor UCS tests on 22 loess samples with different kinds of water content and dry density and analyzes the stress-strain curves of test data.The results show that under the same water content,the UCS and elastic modulus（EM）of loess increase linearly with the increase of dry density and the growth rate has a linear decrease with the increase of water content;the UCS decreases and has a quadratic functional relationship with the increase of water content under the same dry density;the UCS decreases slightly when water content is higher than 16%,and the EM decreases linearly with the increase of water content and its lowering rate increases linearly with the increase of dry density.In addition,the results also prove a good linear correlation between the UCS and the EM.The study provides the scientific basis for the construction with loess as building packing.

关 键 词：黄土 无侧限抗压强度 干密度 含水率 弹性模量 

分 类 号：X94[环境科学与工程—安全科学] TU411.6[建筑科学—岩土工程]