Experimental Study on Mechanical Mechanism of Rock Joints Strength-ened by MICP Technology

Microbial induced carbonate precipitation(MICP)is a new microbial geotechnical technology that has been developed at home and abroad in recent years. MICP,which causes carbonate precipitation through mineralization of microbial metabolism,has been widely used in soil anti-liquefaction and dam reinforcement. Compared with traditional slope reinforcement methods,microbial reinforcement is more environmentally friendly and in line with the concept of sustainable development. In order to explore the cementing effect of MICP technology in completely separated rock joint specimens,an experimental device that can use fluid to cement rock joints in stages is adopted to realize the cementing effect of MICP cementing fluid on joint specimens. The shear strength of joints was investigated under different normal stresses,and the results show that:(1)The MICP technology had a certain cementing effect on rock joints;(2)With the increase of shear displacement,the shear strength of the MICP cementing group and the control gr