摘要
隧道衬砌结构在施工过程中容易出现空洞区域,严重影响了隧道运营的长期稳定性,为研究衬砌结构局部减薄对隧道变形及力学特性的影响,开展了1000组不同隧道埋深、减薄位置角度、减薄长度及减薄厚度条件下的数值模拟计算,通过统计分析不同工况条件下的数值模拟计算结果发现:衬砌减薄位置对最大变形位置影响较小,隧道最大压应力主要集中在隧道的左右拱脚位置,其中多数情况下隧道右边局部减薄容易造成隧道左拱脚位置压应力集中。衬砌局部减薄有可能造成左拱脚及右拱脚处拉应力集中,而更多条件下衬砌局部减薄有可能造成局部减薄区域附近拉应力集中,对于拉应力集中主要为左右拱脚处及减薄区域附近。基于1000组数值模拟计算结果,建立了CART隧道破损预测模型,并通过2个算例验证该模型的合理性及有效性,该研究数值模拟研究可为隧道局部减薄力学分析及隧道稳定性预测提供依据。
The cavity area commonly appears in lining structures in engineering practice,which has great influences on the long-term stability of tunnel operation.In order to investigate the influences of thickness reduction of lining structures on displacement and mechanical characteristics of tunnels,1000 groups of numerical simulations with different buried depths,angles of local thickness reduction location,reduction lengths and thicknesses of linings of tunnel the conducted.Through analysis of the numerical simulation results,it can be concluded that the local thickness reduction area has less influences on displacement.Tthe maximum compressive stress of the tunnel is mainly concentrated at the left and right arch feet of the tunnel,and local thinning at the right side of the tunnel is prone to causing stress concentration at the left arch feet of the tunnel.Local thinning of linings may cause tensile stress concentration at the left and right arch feets,while under more conditions,local thinning of linings may cause tensile stress concentration near the local thinning area.The tensile stress concentration mainly occurs at the left and right arch feets and near the thinning area.Based on the 1000 groups of numerical simulation results,the CART tunnel damage predictive model is established.Meanwhile,2 numerical examples verify the validity of the predictive model.This study provide numerical simulation basis for the mechanical and stability analysis of tunnels under local thickness reduction.
作者
林杰
祝江林
黄思璐
肖强
黄玉冰
雷斯达
周攀
LIN Jie;ZHU Jianglin;HUANG Silu;XIAO Qiang;HUANG Yubing;LEI Sida;ZHOU Pan(Research and Development center for Highway Construction and Maintenance Technology,Wuhan 430000,China;Hubei Jiaotou Intelligent Testing Co.,LTD,Wuhan 430000,China)
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2024年第S02期177-182,共6页
Chinese Journal of Geotechnical Engineering
基金
交通运输部在役干线公路基础设施与安全应急数字化试点项目:湖北省在役干线公路基础设施智能养护试点(212)
湖北省交通运输厅科技项目:基于大数据技术的湖北高速公路隧道养护智能决策研究(2022-11-4-5)。
关键词
衬砌结构
局部减薄
决策树模型
数值模拟研究
lining structure
local thinning
decision tree model
numerical simulation
作者简介
林杰(1982-),男,正高级工程师,主要从事公路工程智能装备与大数据方向研究。E-mail:12034432@qq.com;通信作者:黄思璐(E-mail:574533139@qq.com)。
