The Influence Of Different Grouting Methods On the Surface Environment Of Short Clear Distance Tunnel

Based on a four-line parallel short-clearance subway tunnel in Beijing, this paper takes the finite element method to thoroughly conduct research on the ground settlement caused by the parallel short-clearance tunnel construction. It simulates the effects of four types of reinforcement methods for deep hole grouting reinforcement, deep hole grouting and radial grouting reinforcement, reinforcement of anchor rods, and deep hole grouting reinforcement for tension anchor rods on ground settlement under different clearance conditions. The conclusions suggested that the effect of controlling the ground settlement decreased which proved that the reinforcement of tension anchors is the best, followed by deep hole grouting reinforcements. Grouting is better than radial supplementary grouting combined reinforcement. The surface settlement curve of the four-line parallel short clear-distance tunnel under the Grade VI surrounding rock is in the form of a single peak, as the maximum value shows near the center of No. 2 and No. 3 caves. The numerical simulation is consistent with the field measurement law, which shows that the finite element simulation calculation method is significant in predicting the influence of short clear distance tunnels on the ground settlement during construction