超深TRD工法下基坑逆作法施工对周边环境影响分析
  • 作者: 秦志龙
论文摘要

超深TRD工法下基坑逆作法施工对周边环境影响分析

秦志龙

(上海建工二建集团有限公司,上海 200080)

[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

[中图分类号]TU435  [文献标识码]A          [文章编号]1002-8498(2021)07-0035-05

Numerical and Monitoring Analysis on Environment of Inverse Foundation Construction By TRD Method  

QIN Zhilong

(Shanghai Second Construction Group Co., Ltd.Shanghai 200080, China)

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 26.4mm. The maximum settlement deformation value of surrounding soil was 22.6mm. The maximum settlement deformation value of the south side pipeline was 7.08~18.99mm and the west side pipeline was 6.04~19.03mm. The maximum value of the outside water table is 600mm 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

[作者简介] 秦志龙,工程师,E-mail: yuhuigeo1989@163.com

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