压实度与初始含水率对红黏土崩解特性的影响  

Effects of Compactness and Initial Water Content on Disintegration Characteristics of Red Clay

作　　者：李善梅[1,2] 吴孟 蒙剑坪[1,2] 刘之葵[1,2] LI Shanmei;WU Meng;MENG Jianping;LIU Zhikui(Guangxi Key Laboratory of Geomechanics&Geotechnical Engineering,Guilin University of Technology,Guilin 541004,China;College of Civil Engineering&Architecture,Guilin University of Technology,Guilin 541004,China;Chongqing Institute of Geology and Mineral Resources,Chongqing 401120,China)

机构地区：[1]桂林理工大学广西岩土力学与工程重点实验室,广西桂林541004 [2]桂林理工大学土木与建筑工程学院,广西桂林541004 [3]重庆地质矿产研究院,重庆401120

出　　处：《河南科技大学学报（自然科学版）》2021年第4期54-59,M0006,共7页Journal of Henan University of Science And Technology:Natural Science

基　　金：国家自然科学基金项目(41867039);广西自然科学基金项目(2017GXNSFAA198238);广西中青年教师基础能力提升项目(2019KY0277,2020KY06028);桂林理工大学博士启动基金项目(RD19100185);广西岩土力学与工程重点实验室开放基金项目(桂科能19-Y-21-3);广西建筑新能源与节能重点实验室开放基金项目(桂科能19-J-21-11)。

摘　　要：为了研究压实度和初始含水率对红黏土的崩解影响机制,将取自桂林市南郊的红黏土压制成不同压实度和初始含水率的试样,采用自制仪器进行崩解性试验,计算不同时间的累积崩解率。同时,基于非饱和土力学分析不同初始条件下红黏土的崩解机制。试验结果表明:非饱和红黏土的崩解率随压实度增大而增大,随初始含水率增大则先减小后增大,最优含水率土样的崩解率最低。水流入渗过程中提高孔隙气压、降低基质吸力、产生膨胀力以及(超)静孔隙水压力,是不同压实度和初始含水率红黏土崩解的主要影响因素。To study the effect of compactness and initial water content on the disintegration of red clay,the samples with different compactness and initial water content were pressed by the red clay taken from the southern suburb of Guilin.The disintegrating property experiment was carried out with a self-made instrument,and the cumulative disintegration rates at different times were calculated.Meanwhile,the disintegration mechanism of red clay under different initial conditions was analyzed based on unsaturated soil mechanics.The experimental results show that the disintegration rates of unsaturated red clay increase with the increasing of compactness,decrease firstly and then increase with the increasing of initial moisture content.The disintegration rate of optimum moisture content soil sample is the lowest.In the process of water flow infiltration,increasing pore pressure,reducing matric suction and generating expansive force and(over)static pore water pressure are the main factors affecting the disintegration of red clay with different compaction degrees and initial moisture content.

关 键 词：红黏土 崩解 压实度 初始含水率 

分 类 号：TU411.91[建筑科学—岩土工程]