Inf1uence of Metro Shield Tunnel Construction on Ground Disturbance

doi:10.3969/j.issn.1674-0696.2014.01.09

Abstract

Abstract: Construction of shield tunnel will inevitably disturb the sUITounding ground. Construction parameters of shield tunnel were important factors which induced the ground disturbance. These parameters included support pressure in the face , 0- ver excavation of shield machine , grouting pressure and time in the tail etc. By the numerical simulation of the shield tunnel driving process , the influence of shield tunnel construction parameters on ground surface settlement and the load of the tunnel and segment intemal force were studied. Results indicate that support pressure in the excavation section is the main factor that affects the ground movement ahead of shield machine. Over excavation , grouting pressure and time in the tail have great influence on the ground movement , the extemal loading and the intemal force distribution of the tunnel and segment lining structure. The results also show that when the construction parameters are controlled in a reasonable range , the disturbance induced by shield tunnel construction , ground settlement and segment intemal force can be effectively decreased.

Key words: shield tunnel, driving, ground disturbance, numerical simulation

摘要： 盾构掘进不可避免地会对周围地层产生扰动，其中盾构自身的施工过程参数是引起地层扰动的重要因素，这些施工过程参数包括掘削面支护压力、盾构机超挖量、盾尾注浆压力、注浆时间等。通过对地铁盾构隧道掘进过程的数值模拟，研究盾构施工参数对地层扰动的影响规律。结果表明:掘削面支护压力是影响盾构机前方的地表沉降的主要因素，盾构机超挖量、盾尾注浆压力及注浆时间3 者对地层的位移、管片衬砌承受的外荷载及结构内力分布均具有显著影响。研究表明，将盾构施工的关键参数控制在一个合理的范围内时，可以有效地减小盾构施工对地层的扰动，从而降低地表沉降和管片结构内力。

关键词: 盾构隧道, 掘进, 地层扰动, 数值模拟

CLC Number:

U455.43

Fang Yong , Yang Bin , Yang Zhihao , Fu Yapeng. Inf1uence of Metro Shield Tunnel Construction on Ground Disturbance[J]. Journal of Chongqing Jiaotong University(Natural Science), 2014, 33(1): 36-41.

方勇，杨斌，杨志浩，符亚鹏. 地铁盾构隧道施工对地层扰动的影晌因素分析[J]. 重庆交通大学学报（自然科学版）, 2014, 33(1): 36-41.

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