Experimental Study on Disintegration Characteristics of Soft Rock under Acidic Environment

Abstract

Abstract The Red-bed soft rock is widely distributed in South China, and it has been exposed to acid rain for a long time, which brings great risks to the stability of the engineerings. Therefore, the Red-bed soft rock in South China is selected as the research object. A disintegration test under acidic environment was carried out, and the law of grain size change during disintegration is obtained. The reaserch shows that: (1) Disintegration is a process in which large particles gradually transform into small particles; (2) Acidic environment promotes the disintegration of Red-bed soft rock, and the stronger the acidity, the stronger the disintegration; (3) In acidic environment, the disintegration of Red-bed soft rock can be divided into three stages: water absorption stage, rapid disintegration stage and slow disintegration stage; (4) Red-bed soft rock disintegration to different acidic solutions is different, which HNO3 dominates the disintegration than H2SO4; (5) Due to the dissolution of mud, the main minerals participate in the reaction, causing rock cementation loss withpores larger, and finally lead to the softening and disintegration of the Red-bed soft rock.