矿物成分相关的黏土一维压缩特性分析  

One-dimensional compressibility of soft clay related to clay minerals

作　　者：金银富[1] 张爱军[2] 尹振宇[1] 朱启银[1] 王建华[1] 

机构地区：[1]上海交通大学土木工程系,上海200240 [2]西北农林科技大学土木工程系,陕西杨凌712100

出　　处：《岩土工程学报》2013年第1期131-136,共6页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(41240024);上海市浦江人才计划项目(11PJ1405700);高等学校博士学科点专项科研基金(20110073120012);欧盟玛丽居里行动计划(PIAPP-GA-2011-286397)

摘　　要：为了探索不同黏土矿物成分对黏土一维压缩特性的影响,采用高岭土、伊利土、蒙脱石及绿泥石,按不同质量比例混合来制备重塑土样,进行室内标准一维压缩试验。大量试验结果对比表明:①高岭土与伊利土混合土样的压缩指数(Cc)和回弹指数(Cs)都随伊利土含量的增加而增加;②高岭土、伊利土与蒙脱石混合土样的Cc和Cs随蒙脱石含量的增加而增大,且蒙脱石的作用占主导地位;③高岭土、伊利土、蒙脱石及绿泥石混合土样的Cc和Cs随蒙脱石与绿泥石二者含量之和的增加而增大,且蒙脱石的作用占主导地位。基于试验结果,总结出各黏土矿物成分影响的压缩指数与回弹指数的非线性表达式。此外,试验表明所有混合土样的压缩指数与回弹指数的比值(Cc/Cs)介于6.1和9.1之间变化。In order to investigate the influence of minerals on the compressibility of clay, the artificial mixtures with different weight proportions of clay minerals （i.e., kaolinite, illite, montmorillonite and chlorite） are prepared. The conventional oedometer tests are carried out on these remolded soil samples. Comparisons among the experimental results indicate that （1） for mixtures of kaolinite and illite, the compression index and rebound index increase with the increase of the content of illite; （2） for mixtures of kaolinite, illite and montmorillonite, they increase with the content of montmorillonite; and （3） for mixtures of kaolinite, illite, montmorillonite and chlorite, they increase with the content of montmorillonite and chlorite, and the montmorillonite has the dominant contribution. Based on both the compression and rebound indices considering the Cc/Cs for all mixtures varies from 6.1 to 9.1. the experimental results, two nonlinear equations are proposed for influence of clay minerals. In addition, it is found that the value of Cc/Cs for all mixtures varies from 6.1 to 9.1.

关 键 词：高岭土 伊利土 蒙脱石 绿泥石 压缩指数 回弹指数 

分 类 号：TU47[建筑科学—结构工程]