隧道穿越上软下硬地层引起的地面沉降规律研究
岳强1陈新1杨馨茹2,3张琳2左言华2兄广为2丁红军1刘浩1杨永军4于广明2
Study on Land Subsidence Law Caused by Tunnel Passing through Upper-soft Lowerhard Strata
YUE Qiang1CHEN Xin1YANG Xinru2,3ZHANG Lin2ZUO Yanhua2XIONG Guangwei2DING Hongjun1LIU Hao1YANG Yongjun4YU Guangming2
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作者信息:1.中国建筑五局华南公司, 510304, 广州
2.青岛理工大学土木工程学院, 266033, 青岛
3.中天设计集团有限公司长春分公司, 130012, 长春
4.中铁十五局集团城市轨道交通工程有限公司, 471003， 洛阳
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Affiliation:1.China Construction Fifth Engineering Bureau South China Company, 510304, Guangzhou, China
2.Qingdao University of Technology, 266033, Qingdao, China
3.Zhongtian Design Group Co., Ltd., Changchun Branch, 130012, Changchun, China
4.China Railway 15th Bureau Group Urban Rail Transit Engineering Co., Ltd., 471003, Luoyang, China
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关键词:
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Key words:
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DOI:10.16037/j.1007－869x.20220143
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中图分类号/CLCN:U455.43
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栏目/Col:土建工程
摘要:
［目的］上软下硬地层盾构施工具有较大难度，盾构机对软岩与硬岩的切削效果与盾构机推进受到的阻力不同，将使地层受到较大扰动，引起较大地面沉降，影响城市建（构）筑物安全与隧道安全施工,故有必要对其进行深入研究。［方法］以某市隧道工程为例，进行上软下硬地层隧道盾构施工引起的地面沉降规律研究。引入地层复合比，推导隧道断面软硬岩不同占比施工引起的地面最大沉降值计算公式；以地层复合比为变量，采用Midas有限元软件建立地层复合比分别为0、25%、50%、75%和100%的隧道开挖模型；根据数值计算结果分析地层复合比对地面沉降的影响，并将地面最大沉降理论计算值、数值模拟值与现场监测值作对比分析。［结果及结论］最终研究成果可为上软下硬地层中隧道施工引起的地面沉降问题提供借鉴。
Abstracts:
［Objective］ Shield construction in upper-soft lower-hard strata is relatively challenging. Different cutting effects of shield machine on soft and hard rocks, as well as the different resistance encountered during shield propulsion, will cause great disturbance to the strata, and the resulted relatively large land subsidence will affect the safety of urban buildings (structures) and tunnel construction. Therefore, it is necessary to conduct an in-depth research on this issue. ［Method］ Taking a tunnel project in a certain city as an example, the law of land subsidence caused by shield tunnel construction in upper-soft lower-hard strata is studied. By introducing the stratum composite ratio, a calculation formula of the maximum land subsidence caused by construction with different soft and hard rocks proportions in the tunnel section is derived; using the stratum composite ratio as a variable, tunnel excavation models with strata composite ratios of 0, 25%, 50%, 75% and 100% respectively are established with finite element software Midas; the influence of strata composite ratio on land subsidence is analyzed according to the numerical calculation results, and a comparative analysis of the theoretical calculation value, numerical simulation value and field monitoring value of the maximum land subsidence is carried out. ［Result & Conclusion］ Final research results can provide references for the land subsidence problem caused by tunnel construction in upper-soft lower-hard strata
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