高水位区地下连续墙穿越粉砂层槽壁稳定性数值分析
  • 作者: 严朝锋,张孟喜,周忠群
论文摘要

高水位区地下连续墙穿越粉砂层槽壁稳定性数值分析*

严朝锋1,张孟喜2,周忠群2 

(1.中铁二十局集团第一工程有限公司,江苏 苏州 2151512.上海大学力学与工程科学学院,上海 200444)

[摘要]依托苏州春申湖路快速化改造工程湖中区段地下连续墙施工,通过采用有限元软件对湖区地下连续墙成槽施工进行数值模拟,与实际地下连续墙施工中的超声波检测结果进行对比,从而分析高水位区穿越粉砂层槽壁变形特征和影响规律。研究表明:考虑承压水作用时,粉砂层槽壁侧向位移较大,易发生槽壁失稳破坏;考虑泥皮作用时,对粉砂层槽壁侧向位移影响较小,但对粉砂层的塑性应变影响却较为明显;高地下水位对粉砂层稳定性影响较大,从粉砂层的抗剪强度考虑,内摩擦角和黏聚力对粉砂层稳定性均有重要影响,但内摩擦角影响程度较黏聚力大。

[关键词]地下工程;地下连续墙;承压水;槽壁侧向位移;超声波检测;有限元分析

[中图分类号]TU753    [文献标识码]A    [文章编号]1002-8498(2021)18-0051-06

Numerical Analysis of the Stability of Diaphragm Wall Crossing Silty Sand in High Water Area

YAN Chaofeng1, ZHANG Mengxi2, ZHOU Zhongqun2 

(1.China Railway 20th Bureau Group First Engineering Co., Ltd., Suzhou, Jiangsu 215151, China; 2.School of Mechanics and Engineering Sciences,Shanghai University, Shanghai 200444, China)

Abstract:Relying on diaphragm wall in lake constriction of Suzhou Chunshenhu Road rapid transformation project, the finite element software is adopted to numerically simulate the construction. Combining the actual diaphragm wall, the ultrasonic detection figure and calculated values are compared to analyze deformation characteristics and the influence law under high water area crossing through the powder sand slurry.The results show that firstly, when the effect of artesian water is considered, the silt trench wall moves more laterally, and the trench wall is prone to instability and failure. Secondly, when considering the effect of mud crust, it has little effect on the lateral movement of silt layer, but more obvious effect on the plastic strain of silt layer. Thirdly, high groundwater level has great influence on the stability of silt layer. Considering the shear strength of silt layer, the internal friction angle and cohesion have important influence on the stability of silt layer, but the influence of internal friction angle is greater than cohesion.

Keywords:underground;diaphragm wall;artesian water;lateral displacement of trench;ultrasonic testing;finite element analysis

* 中铁二十局科研立项:复杂地质超深地下连续墙施工防坍技术研究(YF1901SD048

[作者简介]严朝锋,高级工程师,Email:596004281@qq.com

 

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