Abstract
Based on shallow parallel underground tunnel and double-line shield tunnel of Jinan Rail Transit Line R3, this paper proposes two reinforcement measures including bored piles and curtain grouting in the middle of the tunnel, making a numerical analysis and comparison of the reinforcement effect. The results show that the influence of later tunnel construction on the deformation of earlier tunnel can be effectively reduced after taking two reinforcement measures respectively and the reinforcement effect of the bored piles is better.
Highlights
With the increase in parallel construction of small-pitch tunnels[1], the resulting engineering risks and construction difficulties are increasing[2,3,4,5,6]
When the clear distance of the tunnel is too small, certain reinforcement measures should be taken to increase the stability of the surrounding rock, so as to reduce the deformation of the surrounding rock of the tunnel and reduce the risk of the tunnel
It is of great engineering significance to study the reinforcement measures of tunnels under the condition of small clear distance parallel construction
Summary
With the increase in parallel construction of small-pitch tunnels[1], the resulting engineering risks and construction difficulties are increasing[2,3,4,5,6]. It is of great engineering significance to study the reinforcement measures of tunnels under the condition of small clear distance parallel construction. Based on shallow parallel underground tunnel and double-line shield tunnel of Jinan Rail Transit Line R3, this paper proposes two methods for the construction and reinforcement of small-pitch tunnels suitable for this project, namely curtain grouting method and drilling bored pile method. MIDAS/GTS software is used to numerically simulate the two reinforcement methods and analyze the reinforcement effects. It will provide technical support and reference for similar projects in the future
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