Shield Tunnel Subsidence Influence Factor Analysis and Construction Optimization
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摘要: 以北京地铁10#线某盾构法隧道施工为背景,分析了盾构施工中各因素对地表变形的影响.结果表明:地基变形模量的提高,能减小地面沉降和施工过程中的差异沉降;围岩应力释放率越小,地面沉降和施工过程中的差异沉降越小;盾构正面土压力越大,越容易引起前方土体隆起,减少最终沉降,同时,越容易增大施工过程中的差异沉降;等代层变形模量越大或者越小有利于减少沉降,居中时沉降最大.通过对施工参数优化,使得盾构推进过程中对周围地面和结构物的影响最小.Abstract: This paper analysed the surface deformation caused by shield construction parameters, which refer to the background of a shield tunnel construction of Beijing subway 10th line.The results show that increase rock deformation modulus can reduce surface subsidence and differential settlement, when the rock stress release rate is smaller, and the surface subsidence and differential settlement is smaller.When shield positive soil pressure is greater it causes Uplift in front of soil and reduce final settlement, but it increases the differential settlement in the course of construction, when the equivalent circle zone deformation modulus is larger or smaller, the settlement is small.Through parameters optimization, it makes the influence on the ground surface and structures deformation to the minimum.
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Keywords:
- shield tunneling /
- tunnel /
- construction parameters /
- subsidence /
- stress release /
- optimization
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