Abstract
During the tunnel construction under the road, the shallower the tunnel depth, the greater the effect of the surface settlement. Thus, to analyze the ground settlement caused by tunnel construction under ultrasmall distance, the research is based on a tunnel in Ningqiang County and uses numerical simulation and measurement to analyze the ground settlement and the effect of reinforcement measures. The research draws the following conclusions. For the ultrasmall distance tunnel under road construction, the combination of pipe shed and advanced small pipe grouting reinforcement measures inhibits the surface settlement. After the advanced small pipe is reinforced, the surface settlement value is reduced by about 25%, and the reinforcement effect is more obvious after the increase of the large pipe shed. The surface settlement value is reduced by about 60%. The surface settlement caused by the excavation of the circular soil accounts for about 50%–60% of the total settlement value, which is for the whole construction. The key processes, which involve the combination of reinforcement measures, focused on the suppression of surface settlement caused by the excavation of the circular soil. After the reinforcement measures, the variation of the settlement groove width was not obvious but the curvature and peak value of the settlement groove is reduced significantly.
Highlights
Research ArticleResearch on Ground Settlement Regularity of Soft Rock Tunnel under Ultrasmall Distance
During the construction of the tunnel under passing the highway, the existing road pavement is susceptible to disasters, such as subsidence, cracking, and collapse caused by the disturbance of the tunnel excavation, which affects the normal operation of the existing traffic line [1]. e risk of pavement disaster is higher under ultraclose distances
Li [4] analyzed the effects of excavation method, reserved bench length, advanced support, and tunnel burial depth on ground settlement based on the Harbin subway tunnel
Summary
Research on Ground Settlement Regularity of Soft Rock Tunnel under Ultrasmall Distance. Us, to analyze the ground settlement caused by tunnel construction under ultrasmall distance, the research is based on a tunnel in Ningqiang County and uses numerical simulation and measurement to analyze the ground settlement and the effect of reinforcement measures. For the ultrasmall distance tunnel under road construction, the combination of pipe shed and advanced small pipe grouting reinforcement measures inhibits the surface settlement. After the advanced small pipe is reinforced, the surface settlement value is reduced by about 25%, and the reinforcement effect is more obvious after the increase of the large pipe shed. E surface settlement caused by the excavation of the circular soil accounts for about 50%–60% of the total settlement value, which is for the whole construction. E key processes, which involve the combination of reinforcement measures, focused on the suppression of surface settlement caused by the excavation of the circular soil. The variation of the settlement groove width was not obvious but the curvature and peak value of the settlement groove is reduced significantly
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