干湿循环作用下干密度对红黏土强度影响分析  

Effect of Dry Density on Red Clay Strength under Drying-Wetting Cycles

作　　者：刘宝臣[1] 王良玉 崔延硕 郑元 李蜀江 LIU Baochen;WANG Liangyu;CUI Yanshuo;ZHENG Yuan;LI Shujiang(College of Civil Engineering and Architecture,Guangxi University of Science and Technology,Guilin 541004;China MCC5 Group Corp.LTD,Chengdu 610000;Jiangsu Zhongnan Construction Industry Group Co.Ltd.,Nantong 226000)

机构地区：[1]桂林理工大学土木与建筑工程学院,广西桂林541004 [2]中国五冶集团有限公司,成都610000 [3]江苏中南建筑工业集团有限公司,江苏南通226000

出　　处：《土工基础》2022年第5期787-790,共4页Soil Engineering and Foundation

基　　金：桂科能基金(16-J-21-6)。

摘　　要：为了研究干密度对干湿循环条件下桂林红黏土的影响,制备了不同干密度试样进行干湿循环,并对试样做剪切、压缩、渗透试验。试验结果表明,在最优含水率作用下,土体抗剪强度随着干密度的增加而增大;含水率和干密度一定时,土体抗剪强度随着干湿循环次数的增加而降低;含水率和循环次数一定时,干密度大的土体收缩性低,随着干湿循环次数增加,土体收缩性显著降低;含水率和循环次数一定时,干密度增大,压缩系数减小,随着干湿循环次数增加,压缩模量增大;含水率一定时,渗透系数随着干密度的增加而减小,随着干湿循环的增加而增加。In order to study the effect of dry density on Guilin red clay under drying-wetting cycles,soil samples with different dry densities were prepared under various dry-wet cycles.Then prepared sampled were performed with various tests,such as,shear strength,one dimension compression,and permeability.The test results show that under the effect of the optimal moisture content,the shear strength of the soil increases with the increase of dry density;when the moisture content and dry density are constant,the shear strength of the soil decreases with the increase of the number of drying-wetting cycles;When the moisture content and the number of cycles is constant,the soil with high dry density has the low shrinkage property.As the number of drying and wetting cycles increases,the shrinkage of the soil decreases significantly;when the moisture content and the number of cycles is constant,the dry density increases and compresses The coefficient decreases,as the number of wetting-drying cycles increases,the compressive modulus increases;when the moisture content is constant,the permeability coefficient decreases with the increase of dry density,and increases with the increase of wetting-drying cycles.

关 键 词：红黏土 干密度 干湿循环 抗剪强度 线缩率 体缩率 压缩系数 压缩模量 渗透系数 

分 类 号：TU411[建筑科学—岩土工程]