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Study on the Performance of Twin Shield Tunnel Excavation below Existing Multi-Arch Culvert Bridge in Close Vicinity

涵洞 拱门 发掘 护盾 岩土工程 工程类 结算(财务) 侧向土压力 跨度(工程) 桥(图论) 基础(证据) 变形(气象学) 结构工程 地质学 法学 岩石学 医学 海洋学 万维网 计算机科学 内科学 付款 政治学
作者
Xiaohua Bao,Zhizao Bao,Jun Shen,Shidong Wu,Shuming Yang,Xiangsheng Chen
出处
期刊:Applied sciences [Multidisciplinary Digital Publishing Institute]
卷期号:13 (22): 12285-12285
标识
DOI:10.3390/app132212285
摘要

Various adjacent construction projects are inevitably encountered during the large-scale construction of urban underground transportation. The case of a twin shield tunnel excavated below an existing multi-arch culvert bridge in close vicinity has not yet been thoroughly studied. A case of a shield tunnel excavation below an existing multi-arch culvert bridge in Foshan is presented. First, a fully coupled three-dimensional model incorporating fluid and solid interactions was established to simulate the twin shield tunnel excavation below the existing multi-arch culvert bridge in close vicinity. Subsequently, the numerical model was validated using the modified Peck empirical formula. Finally, the influence of different foundation reinforcement deformation moduli, tunnel excavation face support pressures and grouting pressures on ground deformation was discussed. The results indicate that the area most significantly affected by the excavation of the tunnel passing underneath is not within the section of the multi-arch culvert bridge after applying the foundation reinforcement design. The area most significantly impacted is concentrated as the shield tunnel commences excavation and advances beneath the location corresponding to the 1-hole of the steel corrugated pipe. The range of influence of the ground disturbance extends approximately 7 m in front of the excavation face before the tunnel passed through. The range of ground disturbance decreases to 4–6 m in front of the excavation face after the tunnel passed through. The excavation face support pressure and grouting pressure have a minor impact on the settlement of the multi-arch culvert bridge under this reinforcement design. The results provide useful references for the reinforcement design for tunnel excavation adjacent to existing structures.
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