浅埋岩溶地层溶腔与地铁隧道不同位置关系下的施工力学特性
陈俊1何绪虎2王祥1谷文军3陈兵2王士民2
Construction Mechanical Characteristics of Shallow Karst Stratum Cavity and Subway Tunnel under Different Position Relationships
CHEN Jun1HE Xuhu2WANG Xiang1GU Wenjun3CHEN Bing2WANG Shimin2
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作者信息:1.贵阳市公共交通投资运营集团有限公司， 550081， 贵阳
2.西南交通大学交通隧道工程教育部重点实验室， 610031， 成都
3.中铁开发投资集团有限公司， 650500， 昆明
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Affiliation:1.Guiyang Public Transport Investment and Operation Group Co., Ltd., 550081, Guiyang, China
2.Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, 610031, Chengdu, China
3.China Railway Development and Investment Group Co., Ltd., 650500, Kunming, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2025.04.023
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中图分类号/CLCN:U231.3
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栏目/Col:研究报告
摘要:
［目的］溶腔与新建隧道位置关系复杂。地铁隧道围岩中的溶腔会影响隧道洞内施工及地面环境安全。对此有必要探明溶腔与隧道不同位置关系下对地铁隧道施工的力学特性。［方法］采用ANSYS有限元软件建立数值模型，对隧道洞周位移、初期支护受力、溶腔位移、溶腔应力及地面沉降进行分析。［结果及结论］溶腔的形成会使原地层应力场发生改变，溶腔周边一定范围地层应力得到释放。不同溶腔位置下隧道开挖后初期支护结构受力规律基本相同，溶腔的存在不明显改变初期支护结构的最终受力。对于溶腔顶底部最大位移差，拱底溶腔工况最大，拱顶溶腔工况次之，拱腰溶腔工况最小。无溶腔工况、拱顶溶腔工况、拱腰溶腔工况及拱底溶腔工况下，地面沉降最大值分别为5.37 mm、4.24 mm、4.84 mm、4.42 mm。不同位置溶腔不影响地面沉降变化的总体趋势。
Abstracts:
［Objective］ The relationship between the cavity and the newly built tunnel is complex, and the cavity in the surrounding rock of the subway tunnel can affect the construction inside the tunnel and the safety of the ground environment. Therefore, it is necessary to explore the influence of different positional relationships between the cavity and the tunnel on mechanical characteristics of the subway tunnel construction. ［Method］ A numerical model is established using ANSYS finite element software to analyze tunnel peripheral displacement, initial support stress, cavity displacement, cavity stress, and land subsidence. ［Result & Conclusion］ The formation of a cavity may change the original stratum stress field, and the stratum stress in a certain range around the cavity will be released. The stress law of the initial support structure after tunnel excavation is basically the same at different cavity locations, and the existence of the cavity does not significantly change the final stress of the initial support structure. In terms of the maximum displacement difference from cavity top to bottom, the largest one occurs in the arch bottom cavity condition, followed by the vault cavity condition, and the smallest occurs in arch waist cavity condition. Under the no cavity, vault cavity, arch waist cavity, and arch bottom cavity conditions, the maximum land subsidence are 5.37 mm, 4.24 mm, 4.84 mm, and 4.42 mm, respectively. Cavities at different locations will not affect the overall trend of land subsidence changes.
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