粘性土土洞形成的水化学侵蚀实验

Hydrochemical erosion test of formation of clayey soil hole

一般认为地下环境中土洞的形成，进一步导致坍塌．其主要成因是地下水动力条件的急剧变化，而目前的研究尚未考虑水体化学侵蚀这一因素。作者通过粘性土崩解实验认为，不同水质的水体对土体崩解的影响存在明显差别，水动力作用对其具有促进作用。在地面坍塌的灾害研究中，由于各种因素导致的地下水体化学成分的变化对土体崩解、土洞形成的影响是不能忽视的。

It is commonly thought that the major mechanism of formation of soil hole that progressively leads to collapse is the abrupt change of hydraulic condition in the subsurface environment. But the factcr of hydrochemical erosion has not yet been considered among present researches. The disintegration test of clayey soil in the paper shows that water rnasses of different water quality especially the polluted ones, not only have clearly different abilitles to influence the disintegration processes, but also have obvious acceleration processes under the abrupt changes of hydraulic conolition.