Experimental Research on Microbial Grouting Effect on Strength of Granite Residual Soil in Guangdong
Be aimed at the issue that granite residual soil slopes are prone to landslide in heavy rainfall in Guangdong,the use of microbial induced calcium carbonate precipitation technique to improve the mechan-ical properties of granite residual soil was performed.The specimens of granite residual soil with a average particle diameter of 0.179 mm and 1.547 mm respectively,taken from Zhaoqing and Qingyuan in Guang-dong,were grounted by MICP and tested their mechanisal properties before and after being grouted.The results showed that both types of granite residual soil had been successfully cemented,and the particle sizes and composition of soil influenced the cemented effect by MICP.Their uniaxial unconfined compressive strength reached 2.74 MPa and 3.36 MPa respectively.Triaxial compression tests were also conducted,and the test result indicated that the cohesion of specimens from both sites were improved.