超深TRD工法下基坑逆作法施工对周边环境影响分析
摘要：以上海某超深TRD工法下基坑逆作法开挖为工程背景，建立了基坑开挖对周边管线的变形影响数值分析模型，并根据现场监测结果对围护结构变形、地面沉降变形、地下水位变化及周边管线变形进行系统分析。结果表明：有限元分析及监测结果较为接近，基坑施工对围护体系的变形及对周边环境的影响均在规范允许范围内。围护体系最大水平变形值为26.4mm,周边土体最大沉降变形值为22.6mm,南侧管线最大沉降变形值为7.08～18.99mm,西侧管线最大沉降变形值为6.04～19.03mm,坑外水位最大变化值为地表下600mm,均小于监测报警值。TRD工法的连续性、封闭性、隔水性及稳定性较好且施工深度远大于常规双轴及三轴搅拌桩止水帷幕。
关键词：基坑TRD工法逆作法数值模拟监测
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参考文献[1] 王卫东，陈永才，吴国明.TRD水泥土搅拌墙施工环境影响分析及微变形控制措施 [J] .岩土工程学报，2015,37(S1):1-5.
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[6] 王刚，张少钦，张慧华，等.TRD 围护结构深基坑施工监测及结果分析[J].施工技术，2012,41(24):8-12.
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[2] 谢兆良，李星，叶锡东.TRD工法在紧邻地铁深基坑工程中的应用 [J].地下空间与工程学报，2015,11(S1):163-166.
[3] 王卫东，翁其平，陈永才.56m 深TRD 工法搅拌墙在深厚承压含水层中的成墙试验研究[J].岩土力学，2014,35(11) :3247-3252.
[4] 谭轲，王卫东，邸国恩.TRD 工法型钢水泥土搅拌墙的承载变形性状分析[J] .岩土工程学报，2015,37(S2):191-196.
[5] 魏祥，梁志荣，李博，等.TRD 水泥土搅拌墙在武汉地区深基坑工程中的应用[J] .岩土工程学报，2014,36(S2):222-226.
[6] 王刚，张少钦，张慧华，等.TRD 围护结构深基坑施工监测及结果分析[J].施工技术，2012,41(24):8-12.
[7] 黄炳德，王卫东，邸国恩.上海软土地层中TRD水泥土搅拌墙强度检测与分析[J] .土木工程学报，2015,48(S2):108-112.
Numerical and Monitoring Analysis on Environment of Inverse Foundation Construction By TRD Method
Abstract: Based on Shanghai inverse foundation construction engineering by TRD method, the numerical model of foundation construction impact on pipeline was established. Meanwhile, the horizontal and vertical displacement of enclosure pile, the settlement deformation of road, the groundwater level outside the foundation excavation and the displacement of underground pipeline were analyzed based on construction monitoring data. The results show that: the numerical analysis and monitoring results were relatively close, and the influence of foundation construction on containment system and the surrounding environment were within the controllable range. The maximum horizontal deformation value of the enclosure system was 26.4 mm. The maximum settlement deformation value of surrounding soil was 22.6 mm. The maximum settlement deformation value of the south side pipeline was 7.08～18.99 mm and the west side pipeline was 6.04～19.03 mm. The maximum value of the outside water table is 600 mm below the surface. All above were less than the monitoring alarm value. TRD method has the advantages of continuity, closure, isolation and stability and the construction depth is far bigger than that of other mixing pile.
Keywords: foundation excavation; TRD construction method; top-down method; numerical simulation; monitoring
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