合肥老黏土地层矩形顶管引起的地表沉降分析  

Analysis of Surface Settlement Caused by Rectangular Pipe Jacking in Hefei Old Clay Stratum

作　　者：李志敏[1] LI Zhimin(China Railway Siyuan Survey and Design Group Co.Ltd,Wuhan,Hubei 430063,China)

机构地区：[1]中铁第四勘察设计院集团有限公司,武汉430063

出　　处：《铁道工程学报》2024年第4期18-23,共6页Journal of Railway Engineering Society

基　　金：国家重点研发计划(2022YFC3800900);中铁第四勘察设计院集团有限公司院控科研项目(2022K056)。

摘　　要：研究目的:矩形顶管法因为有效空间利用率高、覆土浅等优点,近年来在工程中得到广泛的应用。本文基于耀远路站1号、2号矩形顶管过街出入口工程实例,采用随机介质理论、Plaxis有限元分析、工程现场监测的方法,分析合肥老黏土地层中顶管施工引起的地表沉降变形规律,以期为类似工程提供参考。研究结论:(1)合肥老黏土地层中的顶管施工主要引起上部地层沉降,沉降主要由管节与土体之间的建筑空隙造成;(2)随着顶管的掘进,地表沉降呈现出先缓慢增加后急剧增加最后又趋于平缓的特点,顶管施工主要影响范围以开挖面为分界线,前部影响范围约为3z0(z0为顶管埋深),后部影响范围约为z0;(3)横向地表沉降基本以顶管中心线为轴线对称布置,影响范围约为中心线两侧各2z0;(4)本研究成果可为老黏土地层中矩形顶管的设计和施工提供参考。Research purposes:Rectangular pipe jacking method has been widely used in engineering in recent years because of its advantages of high effective space utilization and shallow soil cover.Based on the example of Yaoyuan Road Station No.1 and No.2 rectangular pipe-jacking crossing entrance project,this paper analyzes the ground surface settlement and deformation law caused by pipe-jacking construction in Hefei-old clay stratum by using random medium theory,Plaxis finite element analysis and engineering site monitoring methods,and provides reference for similar projects.Research conclusions:(1)Pipe jacking in the Hefei-old clay stratum mainly caused the settlement of the upper stratum,which was mainly caused by the building gap between the pipe joint and the soil.(2)With the driving of pipe jacking,the surface settlement presents the characteristics of a slow increase at first,then a sharp increase,and finally tends to be flat.The main influence range of pipe jacking construction is divided by the excavation face,and the influence range of the front is about 3z0,and the influence range of the rear is about z0.(3)The transverse surface settlement is basically symmetrical with the center line of the pipe jacking as the axis,and the influence range is about 2z0 on both sides of the center line.(4)The research results can provide a basis for the design and construction of rectangular pipe jacking in old clay strata.

关 键 词：矩形顶管 地面沉降 随机介质理论 合肥老黏土 

分 类 号：TU473[建筑科学—结构工程]