The new self-stressing grouting materials developed included Superfine Portland Cement of 92%, expansion agent content of 8%, early strength agent content of 2%, water reducer content of 1.5%. It had higher strength and better effect than the anchor net. The results showed that the new prestressed anchor-grouting reinforcement could restore the loose surrounding rock to the approximately three-dimensional stress state. The effect of the new prestressed anchor-grouting reinforcement was verified by numerical simulation and engineering application. The paper investigated the mechanism and method of the new prestressed anchor-grouting reinforcement.
The self-stressing grouting material was first proposed by us. It combines prestressed anchor and self-stressing grouting reinforced material for broken rock. The paper proposed a new prestressed anchor-grouting reinforcement method for underground broken rock with engineering background of anchor net failed to control the track haulage roadway of Daxing Mine. Grouting has been proposed as an effective reinforcement method for fractured rock. The surrounding rock of the the substation roadway with the multiple support methods failed to control was effectively controlled by the self-stress grouting reinforcement method. The peak strength and elastic modulus of the self-stress grouting reinforced sandstone were 1.11 and 1.043 times those of the ordinary grouting reinforced sandstone.
As the distance from the slurry stone increases, the effect of self-stress on the rock mass gradually decreases. The larger the swelling stress of the slurry stone, the more obvious the reinforcement effect on the fractured rock mass. So, the ultimate shear strength of the slurry-rock interface was improved. The results showed that the compressive stress at the slurry-rock interface was increased due to the swelling stress of the self-stress slurry stone. Based on the self-stress grouting reinforcement model of fractured rock mass, the mechanism and effect of self-stress grouting for reinforcing fractured rock mass were investigated by theoretical analysis, physical experiments, and field experiments with the engineering background of the substation roadway of Pingmei No.10 Mine. Its advantages include increasing the compactness of the slurry stone and improving the stress of grouting reinforced rock mass. The paper proposed the new self-stress grouting reinforcement method for fractured rock mass. However, ordinary cement-based grouting materials have self-shrinkage due to hydration reaction, resulting in the grouting reinforcement effect of the fractured rock mass being greatly reduced. Grouting has been proposed as a effective reinforcement method for the fractured rock of underground engineering.
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