超深素填土圆砾层地铁竖井顺逆结合施工技术研究  

Construction Technology of Subway Shaft with the Combination of Bottom-up and Top-down Method in the Ultra-deep Plain Fill Round Gravel Layer

作　　者：卢世德 刘维正[2] 肖洪波 刘冯光 LU Shide;LIU Weizheng;XIAO Hongbo;LIU Fengguang(CCFED Civil Engineering Co.,Ltd.,Changsha 410004,China;School of Civil Engineering,Central South University,Changsha 410075,China)

机构地区：[1]中建五局土木工程有限公司,长沙410004 [2]中南大学土木工程学院,长沙410075

出　　处：《现代交通技术》2025年第1期71-78,共8页Modern Transportation Technology

基　　金：湖南省住房和城乡建设厅科学技术计划项目(KY201943)。

摘　　要：基于湖南省长株潭城际轨道交通西环线一期超深竖井工程,采用MIDAS建立竖井施工三维数值模型,模拟顺逆结合法施工与逆作法施工的全过程,分析了竖井支护结构与地层的变形特征。比较不同工法的变形控制效果、经济性(工期)、施工条件等,提出了适用于超深素填土圆砾层地铁竖井的顺逆结合施工技术,并对该竖井地下连续墙的水平和竖向位移、地表沉降、深层水平位移、支撑轴力进行了监测。结果表明:采用顺逆结合法施工对地层变形的控制效果更好,地表沉降量、基坑长边和短边深层水平位移最大值相对逆作法施工分别减小约10%、18.8%和60%;测得地下连续墙顶水平、竖向位移最大值分别为1 mm、1.3 mm,墙后地表沉降量小于3 mm,深层水平位移最大值为11.6 mm,均在相应的控制值范围内;环框梁支撑的轴力均明显小于控制值,符合设计要求。采用顺逆结合施工方法,可降低成本、节省工期、缩短基坑暴露时长,研究结果可为类似竖井设计与施工提供参考。Based on the ultra-deep shaft project of the Changsha-Zhuzhou-Xiangtan Intercity Railway West Ring Line PhaseⅠin Hunan Province,MIDAS was used to establish a three-dimensional numerical model for shaft construction.The whole construction process of bottom-up and top-down combination method and reverse method was simulated,and the deform-ation characteristics of the shaft support structure and the stratum were analyzed.Based on the comparison of different con-struction methods in terms of deformation control effect,economy(construction period),construction conditions,the bottom-up and top-down combination construction technology suitable for the subway shaft in ultra-deep plain fill round gravel layer was proposed,and the horizontal and vertical displacement,surface settlement,deep horizontal displacement and support-ing axial force of the diaphragm wall of the shaft were monitored.The results show that the bottom-up and top-down combina-tion method has a better control effect on the formation deformation.Compared with the reverse method,the surface settle-ment,the maximum horizontal displacement of the long side and the short side of the foundation pit are reduced by about 10%,18.8%and 60%,respectively;the measured maximum horizontal and vertical displacements of the diaphragm wall top are 1 mm and 1.3 mm respectively,the surface settlement behind the wall is less than 3 mm,the maximum horizontal dis-placement of the deep layer is 11.6 mm,which are all within the corresponding control value range;and the axial force of ring frame beam support is obviously less than the control value,meeting the design requirements.The bottom-up and top-down combination construction method can reduce the cost,save the construction period,and shorten the exposure time of foundation pit.The research results can provide reference for the design and construction of similar shafts.

关 键 词：超深竖井 圆砾层 顺逆结合 数值模拟 变形监测 

分 类 号：U231.3[交通运输工程—道路与铁道工程] TU478[建筑科学—结构工程]