Composite grouting reinforcement technology for deep roadway surrounding rock

The single grouting method and grouting material can not achieve an ideal grouting effect under the complex geological conditions of deep roadway surrounding rock. In order to solve this problem, a composite grouting reinforcement technology for deep roadway surrounding rock is proposed. Taking the 3210 isolated island working face of a mine in Shanxi Province as an example, this paper expounds on the principle and application of the composite grouting reinforcement technology. Firstly, combined with the geomechanical test results of the field test area and the physical and mechanical parameters of coal and rock mass, the range of each cracked zone of 3210 return air roadway is calculated. Secondly, based on the crack characteristics of surrounding rock zones, three-step grouting technology is proposed. The technology includes shallow low-pressure infiltration grouting, deep high-pressure cracking grouting and supplementary grouting. The depth of each borehole in the three-step grouting technology is determin