干-湿循环条件下川中膨胀岩崩解特性的试验研究

Experimental study on disintegration characteristics of swelling rock in central Sichuan under dry-wet cycle

为了研究膨胀岩崩解过程与崩解物粒径的变化规律,以川中红层膨胀岩为例,进行了干-湿循环条件下膨胀岩的崩解性试验。结果表明:干-湿循环条件下,膨胀岩试样崩解状态变化与崩解物颗粒含量变化紧密相关。膨胀岩浸水时间越长,试样的崩解程度相对越强,但相差不大,且崩解物颗粒越小,浸水时间对其崩解程度的影响越小;对比试样的膨胀率发展和崩解程度可以得出,试样膨胀和崩解在浸水初的短时间内迅速吸水发展,之后速率变缓,膨胀速率和崩解程度正相关。

Taking the central Sichuan red-swelled swelling rock as an example,the disintegration test of swelling rock under dry-wet cycle was carried out,and the disintegration process and the change rule of the disintegration particle size were studied.The results showed that under the dry-wet cycle conditions,the change of the disintegration state of the swelling rock sample was closely related to the change of the partical content of the disintegration.The longer the immersion time of the swelling rock in the test was,the stronger the disintegration degree of the sample was,but the difference was not signifecent,and the smaller the disintegration granule was,the smaller the influence of the immersion time on the disintegration degree was.Comparing with the expansion rate and the degree of disintegration of the sample,it could be concluded that the expansion rate and disintegration of the sample rapidly absorbed water and develoedped in the short time at the beginning of immersion,and then the rate became slower.There was a positive correlation between the expansion rate and the degree of disintegration.