复合地层中大直径盾构下穿建筑物群施工技术
叶至盛1杨凤梅2
Construction Technology of Large-diameter Shield Structure Undercrossing Building Group in Compound Stratum
YE ZhishengYANG Fengmei
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作者信息:1.1. 中电建铁路建设投资集团有限公司， 100044, 北京；
2.2. 中国电建华东勘测设计研究院有限公司， 310014， 杭州
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Affiliation:Power China Railway Construction Investment Group Co., Ltd., 100044, Beijing, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2022.10.008
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中图分类号/CLCN:U455.43
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栏目/Col:研究报告
摘要:
鉴于城市轨道交通区间下穿建筑物过程中沉降不易控制、安全风险大的现状，结合某大直径盾构区间下穿建筑物群的工程案例，总结出渣土改良方法、掘进控制参数、出土量控制及综合注浆等成套施工技术，大直径盾构掘进中遇地层变化和土仓结泥饼问题的处理方法，以及大直径盾构在复合地层中采用的泥膜护壁带压开仓换刀技术，有效控制了建筑物和地表沉降。对盾构机下穿段进行了数值模拟分析，并与其监控量测结果进行了对照，验证了上述工程技术措施的可行性。
Abstracts:
In view of the situation that settlement is hard to control and safety risk is high when urban rail transit interval undercrosses buildings, combined with the engineering case of certain large-diameter shield structure interval undercrosses building group, a complete set of construction technologies are summarized, including residue improvement measures, tunneling control parameters, excavation volume control and comprehensive grouting, treatment measures of stratum change and mud cake formation in soil chamber during large-diameter shield structure tunneling, and the mud membrane method adopted by large-diameter shield structure for opening and changing tools in the composite stratum. The set of technologies effectively controls building and ground surface settlements. After numerical simulation analysis of TBM (tunnel boring machine) in undercrossing section, and compared with the monitoring measured result, the feasibility of the above engineering technology measures is verified.
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