不同含水量亚黏土的崩解特性实验研究  

Experimental study of the disintegration characteristics of loam with different moisture content

作　　者：张泽[1] 马巍[1] PENDIN Vadim V 张中琼[1] 何瑞霞[1] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室,甘肃兰州730000 [2]俄罗斯国立地质勘探大学,俄罗斯联邦莫斯科117997

出　　处：《水文地质工程地质》2014年第4期104-107,124,共5页Hydrogeology & Engineering Geology

基　　金：中科院西部之光博士项目;国家自然科学基金优秀国家重点实验室研究项目(41023003);中科院寒旱所青年人才基金;冻土工程国家重点实验室自主立项课题(SKLFSE-ZQ-13)

摘　　要：为了分析土的初始含水量与其崩解性的相关关系,选取了一种高孔隙率、粉黏粒含量较高,且不具有湿陷性的轻质亚黏土作为研究对象。对7组不同含水量的土样品进行崩解试验,发现随着初始含水量的增大,其崩解时间越长,初始含水量接近于风干含水量的土样品能够完全崩解,当初始含水量为天然含水量时,土样品崩解的过程是由"内"到"外",由整体崩解为大块,然后再崩解为更小的块状;当初始含水量为风干含水量时,土样品崩解过程是由"外"到"内"以鳞片状一层一层地崩解;随着土样初始含水量的增大其崩解速率逐渐变小,初始含水量接近风干含水量时,土样在完全崩解的过程中,其崩解敏感性较强;初始含水量接近天然含水量的情况下,在不完全崩解的过程中,其崩解敏感性较弱。Soil disintegration has a close relationship with the initial water content. A kind of light loam with high porosity and high clay content and without collapsibility as the research object was selected in order to analyze the correlation between the initial soil water content and the disintegration. The disintegration test of samples of 7 groups with different moisture content was conducted. It is found that the time of complete disintegration increases with the increasing initial moisture content,and the soil sample,in which the initial water content is close to air drying moisture content,can be completely disintegrated,and disintegration time is much less than that of the soil samples,in which the initial moisture content is close to the natural moisture content. When the initial water content is equal to the natural water content,the process of the disintegration of soil samples is from the ＂inside＂to＂outside＂,the soil samples disintegrate to chunks,and then break up into smaller clumps. When the initial water content is equal to the air drying moisture content,soil samples disintegrate from ＂outside＂to ＂inside＂with scaly layers and layers. The rate of disintegration becomes smaller with the increasing soil initial water content. Under the condition of the initial water content approach equal to the air drying moisture content,the sensitivity of disintegration is stronger in the process of complete disintegration. Under the condition of the initial moisture content equal to the natural moisture content,soil samples do not completely disintegrate,and the sensitivity of disintegration is weak in the process.

关 键 词：土的崩解 初始含水量 崩解时间 崩解速率 崩解特征 

分 类 号：TU41[建筑科学—岩土工程]