酸污染条件下花岗岩残积土崩解特性试验研究

通过人工方法制备了不同ｐＨ值的酸性溶液污染的原状花岗岩残积土，探讨了不同ｐＨ值的酸 及浸泡时间对土的崩解特性的影响。研究表明:在同一ｐＨ值的酸作用下，花岗岩残积土在一定时间内 的崩解量随浸泡时间的增加而增加，浸泡时间越久，增加量越大；在浸泡时间相同时，花岗岩残积土在一 定时间内的崩解量随着ｐＨ值的减小而增大，且ｐＨ值越小，增加量越大；同时，在同一浸泡时间下，崩解 速度也随着ｐＨ值的减小相应增大。分析可知，双电层结构的改变和胶结物的溶蚀是花岗岩残积土加速 崩解的主要原因。

Experimental Study on Disintegration Characteristics of Granite Residual Soil Under Acid Pollution

In this paper ,undisturbed granite residual soil contaminated by acidic solution of different pH values was pre -pared ,and the effects of different pH values and soaking time on soil disintegration characteristics were discussed .The results show that under the same pH value ,the disintegration amount of granite residual soil in a certain time will in-crease with the increase of soaking time ,and the longer the soaking time ,the greater the increased value .When the soaking time is the same ,the disintegration amount of granite residual soil increases with the decrease of pH value in a certain time ,and the smaller the pH value ,the greater the increased time .At the same time ,disintegration rate increas-es with the decrease of pH value at the same soaking time .The analysis shows that the dissolution of cement and the change of electrical double layer structure are the main reasons for the accelerated disintegration of granite residual soil .