黄土隧道基底树根桩加固效果的数值分析  

Numerical Analysis of Reinforcement Effect of Root Pile in Loess Tunnel

作　　者：丁浩 赖金星[1] 刘厚全[1] 王修领 贺思悦 DING Hao;LAI Jinxing;LIU Houquan;WANG Xiuling;HE Siyue(School of Highway,Chang an University,Xian 710064,Shaanxi,China)

机构地区：[1]长安大学公路学院,陕西西安710064

出　　处：《筑路机械与施工机械化》2018年第1期116-120,共5页Road Machinery & Construction Mechanization

基　　金：西部交通建设科技项目(2014 318J272 10);陕西省工业科技攻关项目(2015GY185);长安大学中央高校基本科研业务费专项资金项目(310821172004;310821153312;310821165011)

摘　　要：为研究树根桩加固软弱黄土隧道对基底沉降的影响,依托榆林某黄土铁路隧道,采用有限元方法对隧底有无树根桩加固的2种工况进行数值模拟,通过对比分析2种工况下隧道边墙角区域和隧底的变形,研究树根桩对隧道基底的加固效果。结果表明:采用树根桩加固后,隧底隆起由16.6cm减小到2.1cm,加固范围内隧底隆起减少68.3%;边墙角区域隆起从8.5cm减少到3.4cm,减幅为58.21%;此外,加固后的拱顶沉降也有所减小。树根桩在较大程度上提高了土层的承载力,加固效果明显。In order to study the effect of strengthening weak loess tunnel with root piles on the foundation settlement,based on a loess railway tunnel in Yulin,the finite element method was applied to conduct the numerical simulation of tunnel floor under two working conditions with and without root pile reinforcement.By comparing the deformation of the tunnel corner area and the floor under the two conditions,the reinforcement effect of the root piles was studied.Results show that after the root piles are applied,the floor lift plummets from the original 16.6 cm to 2.1 cm,and the deformation within the range of reinforcement is reduced by 68.3%;the lift in corner area drops from 8.5 cm to 3.4 cm,and the deformation decreases by 58.21%;in addition,the settlement of the vault is reduced.The root piles show obvious reinforcement effect by greatly enhancing the bearing capacity of the soil.

关 键 词：隧道工程 基底加固 有限元 树根桩 

分 类 号：U414.03[交通运输工程—道路与铁道工程]