天然与风干状态下冷生亚黏土的崩解形态特征  

Morphological characteristics of the disintegration of cryogenic clay loam,natural and air-dried

作　　者：张泽[1,2] 马巍[1] 赵淑萍[1] 冯文杰[1] 武俊杰[1] 肖东辉[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(MGRI-RSGPU)

出　　处：《冰川冻土》2014年第1期118-122,共5页Journal of Glaciology and Geocryology

基　　金：国家自然科学基金项目(41301070;41301071);中国科学院西部之光博士项目;教育部留学回国人员科研启动基金项目(第46批);冻土工程国家重点实验室自主研究项目(SKLFSE-ZQ-13)资助

摘　　要：土的崩解形态是描述土的崩解过程及探讨其崩解机理重要的必要条件之一,选取了一种高孔隙率、粉黏粒含量较高,且不具有湿陷性的原状冷生轻质亚黏土作为研究对象,对其天然含水量及风干含水量状态下的土样品进行崩解试验.结果表明:天然状态的土样呈块状崩解,而风干状态下的呈鳞片状崩解,且鳞片状崩解的强度及平均速率都大于块状崩解;块状崩解的速率随时间变化较为缓和,而鳞片状崩解的速率随时间变化起伏较大.崩解形态与崩解速率有着紧密的对应关系,与崩解形态相对比,发现崩解速率降低的过程是水侵入土样,且土样中空气压力增大的过程,而速率上升的过程则是土样崩解的过程.Disintegration form of soil is one of the necessary conditions to describe the disintegrating process of soil and to investigate its major disintegration mechanism. A kind of cryogenic light loam was selected to be the research object, which is high porosity, high silty clay content and no collapsibility. The disintegration test was done on the specimens with natural water content and air dried. It is found that the specimens with natural water disintegrate to small rocks, and the air dried specimens disintegrate to small flaky pieces. At the same time, the intensity of the disintegration and the average speed of scaly collapse are greater than those of the massive disrup- tion. Block disintegration rate changes with time moderately, but scaly disintegration rate changes with time greatly. Collapse form has close corresponding relation with disintegration rate. It found that the disintegration rate decreasing is due to water intruding into soil specimen, together with air pressure increasing. The process of the rate rising is the process of disintegration.

关 键 词：土壤崩解 崩解形态 崩解速率 冷生亚黏土 

分 类 号：P642.14[天文地球—工程地质学]