既有区间隧道上方填方施工对隧道衬砌变形及受力影响分析

AnalysisThe Influence of Filling Construction on The Deformation and Stress of Tunnel Lining

目前对于地铁区间上方不均匀堆载的计算分析大部分采用数值计算的方法进行分析,而地层结构法计算分析,土层计算参数设置对数值计算最终计算结构影响较大。通过合理简化确定隧道上方填方对隧道产生的超载,采用分层总和法对填方后隧道变形进行分析,采用隧道荷载-结构模型对填方前后隧道衬砌内力进行分析,计算结果较好的反应了填方施工对隧道的影响。本工程计算结果表明,填方导致隧道产生1.639 mm收敛变形,衬砌内力增加最大约25%,对隧道产生较大影响。

At present,most of the calculation and analysis of the uneven load above the subway section are carried out by the numerical calculation method.While the calculation and analysis of the stratum structure method,the calculation parameters of the soil layer has a great influence on the final calculation.In this paper,through reasonable simplification to deter mine the overload caused of the filling above the tunnel,the layered summation method is used to analyze the deformation of the tunnel after the filling,and the tunnel load-structure model is used to analyze the internal force of the tunnel lining before and after the filling.The calculation results reflect the influence of the filling construction above the tunnel.The calculation results of this project show that the filling causes 1.639 mm convergence deformation of the tunnel,and the internal force of the lining increases by about 25%,filling construction has a greati MPact on the tunnel.