压实过程对红黏土的孔隙分布影响研究  

Research on effect of compaction on pore size distribution of laterite soil

作　　者：谈云志[1,2] 孔令伟[2] 郭爱国[2] 万智[3] 

机构地区：[1]三峡大学三峡库区地质灾害教育部重点实验室,湖北宜昌443002 [2]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,武汉430071 [3]湖南省交通科学研究院,长沙410015

出　　处：《岩土力学》2010年第5期1427-1430,共4页Rock and Soil Mechanics

基　　金：交通部西部交通建设科技项目(No.200631878530);中国科学院知识创新工程重要方向项目(No.kzcx2-yw-150);岩土力学与工程国家重点实验室重点项目(No.SKLZ0803)

摘　　要：为研究压实作用对红黏土孔隙分布的影响,采用液氮冻干法对经过压力板仪脱至残余含水率后的压实试样进行干燥,继而利用孔隙仪测试其孔隙分布特征。结果表明,不同干密度试样的孔隙分布特征在孔径d>10μm范围内差异性比较明显,干密度越大分布在该范围内的孔隙越少,但所有试样的大部分孔隙主要分布在孔径d<0.1μm的范围内,并且分布密度十分相似。换言之,常规压实作用只能改变土体某一较大孔径范围内的孔隙,而对小孔径的孔隙改变不大,这也对于说明红黏土路基填料的压实,常规的压实作用对提高土体的压实度幅度有一定范围。To investigate the effect of compaction on the pore size distribution characteristic of laterite soil,the compacted soil samples which were firstly subjected to pressure plate to dehydrated to their residual water content were dried by liquid nitrogen freeze-drying method;and then the corresponding pore size distribution was measured.The results show that,among samples with different dry density,the differences of characteristics of pore size distribution are obvious in the case that the pore size is larger than 10 μm.And the greater the dry density is,the fewer the pores of soil in this scope.However,most of pores of samples are mainly distributed in the range where pore size is finer than 0.1 μm and their pore distribution density are almost the same,which means that conventional compaction of soil can only change the larger pore size,no significant change for the smaller one.This also indicates that the conventional compaction has a limit effect on the compactness of the roadbed which was filled with laterite soil.

关 键 词：红黏土 孔隙分布 压实 

分 类 号：TU443[建筑科学—岩土工程]