上覆软弱路基加固对既有地铁隧道沉降的影响规律  

Influence of Overlying Soft Roadbed Reinforcement on the Settlement Pattern of Existing Subway Tunnels

作　　者：卢华喜[1,2] 刘甦宇 罗青峰 吴必涛[1,2] LU Hua-xi;LIU Su-yu;LUO Qing-feng;WU Bi-tao(School of Civil Engineering,East China Jiaotong University,Nanchang 330013,China;State Key Laboratory of Rail Transit Infrastructure Performance Monitoring and Assurance,East China Jiaotong University,Nanchang 330013,China;School of Architecture and Engineering,Nanchang Institute of Technology,Nanchang 330044,China)

机构地区：[1]华东交通大学土木建筑学院,南昌330013 [2]华东交通大学轨道交通基础设施性能监测与保障国家重点实验室,南昌330013 [3]南昌理工学院建筑工程学院,南昌330044

出　　处：《科学技术与工程》2024年第7期2947-2955,共9页Science Technology and Engineering

基　　金：国家自然科学基金(51868022);江西省自然科学基金(GJJ180300)。

摘　　要：为研究道路施工引起下方既有地铁隧道的沉降问题,在地铁隧道上方斜穿施工道路的基础上,进行了现场隧道沉降变形实测研究,分析了道路在路基注浆加固、路床和路面结构层施工阶段中地铁隧道的沉降曲线。建立地铁隧道-土体-道路模型对道路施工的注浆加固过程及路床和路面结构层施工进行模拟,通过比较地铁隧道沉降计算结果与现场实测值,验证了该精细化模型的准确性。基于此,分析了路床和路面结构层总施工厚度、道路土体性质、隧道下卧土层、隧道衬砌强度等关键参数对地铁隧道的沉降影响规律。结果表明:地铁隧道的沉降值与施工厚度呈正相关关系;道路的存在对隧道的沉降影响越小,其弹性模量和泊松比对地铁隧道沉降几乎没有影响;卧土层的弹性模量越大,土层越不易变形,且地铁隧道沉降越小;衬砌弹性模量增大对地铁隧道沉降影响反而越小。In order to study the settlement of the existing subway tunnel below caused by road construction,on the basis of the construction road diagonally above the subway tunnel,a field tunnel settlement deformation measurement study was conducted to analyze the settlement curve of the subway tunnel in the roadbed grouting reinforcement,roadbed and pavement structure layer construction stages.A subway tunnel-soil-road model was established to simulate the slurry reinforcement process of road construction and the construction of roadbed and pavement structure layer,and the accuracy of the refined model was verified by comparing the calculated results of underpass tunnel settlement with the actual measured values on site.Based on this,the influence law of key parameters such as the total construction thickness of roadbed and pavement structure layer,the nature of road soil,the submerged soil layer of tunnel,and the strength of tunnel lining on the settlement of the subway tunnel was analyzed.The results show these as follows.the settlement value of the subway tunnel is positively correlated with the construction thickness.The presence of the road has less influence on the settlement of the tunnel,and its elastic modulus and Poisson's ratio have almost no influence on the settlement of the subway tunnel.The larger the elastic modulus of the lying soil layer,the less deformable the soil layer is,and the smaller the settlement of the subway tunnel is,the increase in the elastic modulus of the lining has less influence on the settlement of the subway tunnel instead.

关 键 词：道路施工 地铁隧道沉降 施工厚度 土体性质 衬砌强度 

分 类 号：U459.3[建筑科学—桥梁与隧道工程]