软土地层地铁盾构隧道管片收敛变形整治方案
陈春红周奇辉邢玉芳张琼方
Improvement Scheme for Metro Shield Tunnel Segment Convergence Deformation in Soft Soil Stratum
CHEN ChunhongZHOU QihuiXING YufangZHANG Qiongfang
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作者信息:中国电建集团华东勘测设计研究院有限公司， 310014， 杭州
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Affiliation:POWERCHINA Huadong Engineer Co., Ltd., 310014, Hangzhou, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2023.09.033
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中图分类号/CLCN:U455.43
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栏目/Col:应用技术
摘要:
目的：由于外部作业扰动影响，地铁盾构隧道管片易发生横断面收敛变形增大的情况，进而导致管片病害多发，影响地铁运营安全。因此，需针对管片的收敛变形整治措施开展研究。方法：以杭州某地铁区间隧道为例，介绍了其隧道管片收敛变形情况及管片主要病害分布情况；分析了隧道管片横断面收敛变形机理；提出一种隧道管片横断面收敛变形整治方案——MJS (全方位高压喷射)工法桩+微扰动注浆，并分析了所提整治措施的整治效果。结果及结论：所提整治方案对隧道管片收敛变形状况改善较为明显，管片收敛变形整治量基本可以达到10~20 mm，达到管片横断面收敛变形的20%~40%；由于MJS工法桩的隔离作用，整治后管片收敛回弹量较小，基本在5 mm以内，约为收敛整治量的20%；在施工期加强隧道底部注浆能有效防止施工期和后期隧道沉降变形；隧道管片横断面收剑变形整治对隧道的竖向变形和水平变形影响均较小。
Abstracts:
Objective: Due to external operation disturbance, metro shield tunnel segments are prone to increased convergence deformation in the transverse sections, leading to multiple segment defects and compromising metro operation safety. Therefore, it is necessary to research improvement measures for the convergence deformation of tunnel segments. Method: Taking an interval tunnel in Hangzhou Metro as an example, the convergence deformation and distribution of tunnel segment major defects are introduced. The mechanism of tunnel segment transverse section convergence deformation is analyzed. An improvement scheme for transverse section convergence deformation of tunnel segments is proposed, consisting of MJS (metro jet system) piles and microdisturbance grouting, and the effectiveness of the proposed improvement measures is evaluated. Result & Conclusion: The proposed improvement scheme significantly improves the convergence deformation condition of tunnel segments, with the improvement amount of segment convergence deformation reaching 1020 mm, accounting for 20%40% of the convergence deformation in the segment transverse section. Due to the isolating effect of MJS piles, the segment rebound deformation after improvement is minimal, generally within 5 mm, which is approximately 20% of the convergence improvement amount. Reinforcing the tunnel bottom grouting during construction effectively prevents settlement deformation during and after the construction phase. The influence on tunnel vertical and horizontal deformations is minimal before and after the aforementioned improvement.
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