岩土二元体地层下曲线地铁盾构施工响应模拟分析与施工参数优化设计
孙捷城1,2,4谯殿君3王建5王渭明3吕显州3
SUN Jiecheng1,2,4QIAO Dianjun3WANG Jian5WANG Weiming3LYU Xianzhou3
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作者信息:1.济南轨道交通集团有限公司， 250100， 济南
2.东南大学交通学院， 210096， 南京
3.山东科技大学， 266590， 青岛
4.济南交通发展投资有限公司， 250100， 济南
5.青岛地铁集团有限公司第三建设分公司, 266045， 青岛
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Affiliation:1.Jinan Rail Transit Group Co., Ltd., 250100, Jinan, China
2.Transport College, Southeast University, 210096, Nanjing, China
3.Shandong University of Science and Technology, 266590, Qingdao, China
4.Jinan Transit Development Investment Co., Ltd., 250100, Jinan, China
5.Qingdao Metro Group Co., Ltd. Third Construction Branch, 266045, Qingdao, China
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关键词:
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Key words:
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DOI:10.16037/j.1007－869x.20231021
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中图分类号/CLCN:U445.43
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栏目/Col:土建工程
摘要:
［目的］岩土二元体地层作为一种典型的上软下硬复合地层，其复杂的地质条件对曲线地段盾构隧道施工的地层变形机制及力学响应具有显著影响，深入分析不同施工条件下的响应至关重要。［方法］以济南轨道交通3号线滩头站—稻香站区间盾构施工为背景，采用数值模拟与现场监测结合的研究方法，系统分析了围岩变形、管片应力应变及施工参数优化的关键问题，揭示了岩土二元体地层下的施工力学响应，并在此基础上优化设计了施工措施与参数。［结果及结论］岩土二元体对于曲线地段隧道的影响大于直线地段隧道，曲线地段盾构的位移最大值出现在左拱肩处，且曲线地段盾构左拱肩的受影响范围要大于拱顶；在岩土二元体区域，曲线地段盾构处的围岩变形明显大于直线盾构，但曲线地段盾构隧道的变化幅度始终小于直线盾构隧道，且表现为拱顶沉降比拱底隆起更敏感；曲线地段盾构管片的第一、三主应力及变形量均大于直线地段盾构，尤其在距离岩土二元体2 m范围内应力增幅显著。提出了“微扰动精细化掘进+洞内超前注浆加固”的综合控制方案和相应参数，并验证了其有效性，揭示了岩土二元体地层倾角对注浆加固范围的影响规律，指出当倾角小于65°时需适当增大加固宽度。
Abstracts:
［Objective］ The rock-soil binary stratum is a typical upper-soft and lower-hard composite stratum. Due to its complex geological conditions, this stratum significantly influences the stratum deformation mechanism and mechanical response of shield tunnel construction in curved sections. It is crucial to carry out an in-depth analysis on the response under different construction conditions. ［Method］ Taking the shield tunneling construction between Tantou Station and Daoxiang Station section of Jinan Rail Transit Line 3 as the background, a research method combining numerical simulation and on-site monitoring is adopted to systematically analyze the key issues of surrounding rock deformation, segment stress and strain, and construction parameter optimization, revealing the construction mechanical responses of the two under the rock-soil binary stratum, and optimizing the construction measures and parameters on this basis. ［Result & Conclusion］ The rock-soil binary stratum has a greater impact on curved tunnels than on straight tunnels, with the maximum curved shield tunnel displacement occurring at the left arch shoulder, and the affected range of the left arch shoulder in the curved section shield is larger than that of the vault. In the rock-soil binary zone, the surrounding rock deformation of the curved section shield is significantly greater than that of the straight shield, yet the deformation amplitude of the curved section shield tunnel remains smaller than that of the straight shield tunnel, with the vault settlement being more sensitive than the arch bottom uplift. The first and third principal stresses and deformations of the curved section shield segments are greater than those in the straight section, especially within 2 m from the rock-soil binary, the stress increase is significant. A comprehensive control scheme and corresponding parameters of "micro-disturbance refined excavation + inner tunnel advanced grouting reinforcement" are proposed, and its effectiveness is verified, revealing the influence law of the rock-soil binary stratum dip angle on the grouting reinforcement range, and pointing out that when the dip angle is less than 65°, the reinforcement width needs to be appropriately increased.
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