浅埋大跨度隧道施工过程地表沉降变形特征研究

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Abstract According to Mulingguan tunnel of Qingzhou to Linshu highway，the monitoring of ground settlement deformation characteristic on the shallow large-span tunnel in the construction process was carried out，the excavation methods of the three-lane span shallow tunnel were discussed and tunnel ground settlement deformation characteristic under the three-level seven-step parallel tunnel excavation was analyzed. Through field test discovered in the process of the pile roof and before the excavating face，the ground had occurred beforehand settlement displacement. The key step influenced ground deformation near the tunnel center line was first and middle step，then the key step influenced ground deformation near the tunnel arch shoulder was down and last step，it showed that with the tunnel excavation depth increases，the range and depth of its impact on both sides of the tunnel extension. The impact of tunnel excavating face on ground settlement focused on the excavating face within 1 times of the hole diameter D，afterward excavating face one D，the deformation gradually slowed down，and the eventually ground settlement distribution appeared abnormal skewness to the first excavating tunnel. Three-dimensional fast Lagrangian element method was applied to simulate the excavation of shallow large-span tunnel tunnel. The distributions of ground settlement were obtained and the result was in good agreement with that of in-situ monitoring test，the conclusions can provide a reference for other similar projects.

Key words： tunnelling engineering shallow large-span tunnel ground settlement three-bench sexen-tep excavation method key step

Received: 18 February 2011

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https://rockmech.whrsm.ac.cn/EN/Y2011/V30/IS1/3348

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