万中正, 王传银, 刘杨, 姜之阳, 王其宽, 张彬, 刘硕, 王汉勋. 2021: 大断面矩形管廊顶进反力力学效应数值模拟研究. 工程地质学报, 29(S1): 28-37. DOI: 10.13544/j.cnki.jeg.2021-0505
    引用本文: 万中正, 王传银, 刘杨, 姜之阳, 王其宽, 张彬, 刘硕, 王汉勋. 2021: 大断面矩形管廊顶进反力力学效应数值模拟研究. 工程地质学报, 29(S1): 28-37. DOI: 10.13544/j.cnki.jeg.2021-0505
    WAN Zhongzheng, WANG Chuanyin, LIU Yang, JIANG Zhiyang, WANG Qikuan, ZHANG Bin, LIU Shuo, WANG Hanxun. 2021: NUMERICAL ANALYSIS OF THE MECHANICAL EFFECT OF REACTION FORCE OF RECTANGULAR PIPE JACKING IN LARGE SECTION. JOURNAL OF ENGINEERING GEOLOGY, 29(S1): 28-37. DOI: 10.13544/j.cnki.jeg.2021-0505
    Citation: WAN Zhongzheng, WANG Chuanyin, LIU Yang, JIANG Zhiyang, WANG Qikuan, ZHANG Bin, LIU Shuo, WANG Hanxun. 2021: NUMERICAL ANALYSIS OF THE MECHANICAL EFFECT OF REACTION FORCE OF RECTANGULAR PIPE JACKING IN LARGE SECTION. JOURNAL OF ENGINEERING GEOLOGY, 29(S1): 28-37. DOI: 10.13544/j.cnki.jeg.2021-0505

    大断面矩形管廊顶进反力力学效应数值模拟研究

    NUMERICAL ANALYSIS OF THE MECHANICAL EFFECT OF REACTION FORCE OF RECTANGULAR PIPE JACKING IN LARGE SECTION

    • 摘要: 为研究大断面矩形管廊顶进反力对后背墙体系的影响,以北京市通州区畅和西路综合管廊项目为工程背景,采用ABAQUS软件建立顶管始发井后背墙体系的仿真模型,结合管廊顶进全过程中顶力监测数据对后背墙反向施加千斤顶顶推力,对不同顶进阶段中后背体系及周围土层的受力和变形情况进行了分析。数值模拟结果表明:在反力作用下,加载区后背土体水平位移随深度的增加,先增大后减小,前壁土体水平位移随深度的增加,逐渐减小;井周地表土体随距井周距离的增大,水平位移逐渐减小,且在加固区范围内,土体位移下降显著,而竖向位移无明显变化;加载区后背土压力增大,整体小于被动土压力,大于静止土压力,前壁土压力减小,整体小于静止土压力,大于主动土压力;加载中心处土体反力和位移随着顶力的增加呈线性变化趋势;始发井不同位置混凝土支撑受反力作用影响显著。

       

      Abstract: With the background of the comprehensive pipe corridor project in Changhe West Road, Tongzhou District, Beijing, the simulation model of the back wall system of the pipe jacking initiation shaft was established by ABAQUS software in order to study the effect of jacking reaction force on the back wall system of rectangular pipe corridor with large section. This report analyses force and deformation of the back wall system and the surrounding soil layer in different jacking stages, by combining the jacking force monitoring data during the whole process of pipe corridor jacking. The numerical simulation results show five main results. The horizontal displacement of the back-back soil in the loading area increases and then decreases with the increase of depth under the action of the reaction force, while the horizontal displacement of the front wall soil gradually decreases with the increase of depth. The horizontal displacement of the surface soil around the wall gradually decreases with the increase of distance from the well perimeter; and the soil displacement decreases significantly within the reinforcement area, while the vertical displacement does not change significantly. The overall soil pressure is smaller than the passive soil pressure when back soil pressure in the loading area increases; and the overall soil pressure is smaller than the static soil pressure when the overall soil pressure at the front wall decreases. The soil reaction force and displacement at the loading centre show a linear trend with the increase of the top force. The concrete support at different locations of the starting well is significantly affected by the reaction force.

       

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