Construction Sequence Optimization of Overlap Shield Tunnel Beneath Water Supply Pipe in Close Distance
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摘要: 依托苏州地铁3号线现代大道站~娄江大道站区间重叠盾构隧道下穿给水管段,采用数值方法分析不同施工顺序(先下后上、先上后下)对新建结构-既有结构-地表力学性能的影响,综合考虑地表沉降、给水管与隧道衬砌结构力学性能,给出重叠隧道下穿给水管施工顺序建议。结合现场监测结果,分析施工对给水管变形的影响,得到以下结论:1)重叠隧道两次施工均会对给水管产生两次扰动,且不利影响会叠加;2)下部隧道施工对地表沉降与给水管变形影响小于上部隧道施工产生的影响;3)综合考虑,推荐采用先下后上的施工顺序;4)重叠隧道的施工引起给水管的变形不影响给水管的正常使用。Abstract: Based on the overlap shield tunnel beneath the water supply pipe between Xiandaidadao Station and Loujiangdadao Station of Suzhou Metro Line 3, numerical method was used to analyze the mechanical properties of new structure-existing structure-earth’s surface under different construction sequences ("first lower then upper" or "first upper then lower"). And the better construction sequence was recommended considering the earth’s surface settlement, the water supply pipe deformation and the shield lining deformation. Combined with site monitor results, the influence of construction on water supply pipe was analyzed. Through the above research, the following conclusions were obtained: 1) constructions of overlapping tunnels caused two disturbances to the water supply pipe, and the adverse effects gradually increased; 2) the influence of lower tunnel construction on earth’s surface settlement and water supply pipe deformation was less than that of upper tunnel construction; 3) the construction sequence "first lower then upper" should be recommended; 4) the deformation of the water supply pipe caused by the construction of overlapping tunnels could meet the requirements of normal use of the water supply pipe.
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Key words:
- overlap shield tunnel /
- shield /
- beneath /
- construction sequence
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