旋喷桩在偏压隧道围岩加固中的数值分析及应用  

Numerical simulation and application of jet grouting pile to surrounding rock consolidation of unsymmetrial loading tunnel

作　　者：杨秀竹[1] 黄建陵[1] 赵建群 雷金山[1] 成多智 

机构地区：[1]中南大学土木建筑学院,湖南长沙410075 [2]中铁五局湘桂铁路一标指挥部,湖南东安425900

出　　处：《铁道科学与工程学报》2011年第1期73-76,共4页Journal of Railway Science and Engineering

基　　金：湖南省自然科学基金资助项目(07JJ3104);南宁铁路局湘桂铁路科技攻关项目(NXG1003)

摘　　要：针对某浅埋偏压隧道采用地表旋喷桩加固措施的实际情况,对三台阶法开挖隧道时围岩的位移和应变响应进行了数值分析,并与未采用地表加固情况进行了比较。计算结果表明:采用三台阶法开挖隧道,上台阶开挖引起较大的竖向位移和应变,而中台阶和下台阶开挖产生很小的竖向位移和应变,这主要是因为上台阶位于土层中,中台阶有一部分位于岩层中,下台阶完全位于岩层中。采用三台阶法分部开挖,最大剪应变均位于上台阶开挖右拱脚处。隧道上覆土层采用旋喷桩加固后,可以有效控制围岩变形。Jet grouting piles method was used to reinforce overlying soil of shallow buried tunnel under unsymmetrical pressure.Numerical simulation was chosen to analyze displacement and strain response during tunnelling with three steps excavation method under condition of reinforcement and unreinforcement.The results show that larger vertical displacement and shear strain occurs during excavation of upper bench,and it changes very little when center and subjacent bench were excavated.This is because upper bench is located in soil,part of center bench in rock,and the whole subjacent bench in rock.Largest shear strain occurs at the arch foot of upper bench.It is concluded that jet grouting piles method can control surrounding rock deformation effectively.

关 键 词：偏压隧道 膨胀土 旋喷枪 竖向位移 剪应变 

分 类 号：U452.12[建筑科学—桥梁与隧道工程]