Practice Study on Grouting Treatment Engineering of Broken Rock Mass

Abstract

The fractured rock mass is the unfavorable geology often exposed during the construction of the subway. Combined with the problem of seepage water in the side wall of the Xiangjiang Road station of Qingdao Metro, it explores effective means to control the fractured rock mass. Through the engineering hydrogeology and the surrounding environment analysis of the foundation pit, the ground curtain grouting scheme of the whole station is adopted to block the groundwater outside the pit of the station. The grouting borehole design, grouting parameter design, grouting dynamic monitoring control, etc. are determined in turn, wherein the grouting material adopts 800 mesh ultra-fine cement, fully considering the crack opening problem. The grouting method adopts forward section grouting, which fully considers the problem of poor integrity of fractured rock mass. Finally, the effectiveness of the grouting method is verified by engineering test section. The research results show that the super-fine cement ground surface curtain grouting method can better solve the problem of seepage water in fractured rock, and can provide reference for similar projects.