土岩地层暗挖城市地铁隧道拱顶临界覆岩厚度预测及应用  

Prediction and application of the critical overburden thickness for urban subway tunnel in soil and rock stratum

作　　者：纪方 刘浩[1,2] 王洪涛 范忠超 Ji Fang;LLiu Hao;Wang Hongtao;Fan Zhongchao(Bejing Jiaotong University,Bejing 100044,China;Jinan Rail Transit Group Construction Investment Co.,Ltd.,Shandong 250100,China;Shandong Jianzhu University,Shandong 250101,China)

机构地区：[1]北京交通大学,北京100044 [2]济南轨道交通集团有限公司,山东济南250100 [3]山东建筑大学,山东济南250101

出　　处：《土木工程学报》2024年第S1期109-116,共8页China Civil Engineering Journal

基　　金：国家自然科学基金项目(52374093);中国博士后科学基金资助项目(2022M711314);山东省自然科学基金(ZR2022ME088);济南市科研带头人工作室项目(202333054)。

摘　　要：以济南地铁4号线典型土岩地层暗挖隧道工程为依托,构造提出了隧道拱顶覆岩的理论破坏分析模型,利用塑性极限分析上限法,推导得到了隧道拱顶临界覆岩厚度与隧道洞内支护力的理论计算公式,分析得出不同岩体力学参数、隧道设计参数对隧道拱顶临界覆岩厚度的影响规律。在此基础上考虑不同隧道拱顶覆岩厚度影响,开展了土岩复合顶层隧道开挖数值模拟对比研究,揭示了不同拱顶覆岩厚度下隧道围岩变形破坏特征,并与理论结果进行了对比分析,验证了本文理论方法的有效性。本文研究成果可为土岩复合地层暗挖隧道合理埋设选取与围岩支护设计提供一定理论参考。Based on the typical soil-rock stratum tunnel project of Jinan Metro Line 4,this paper constructs a theoretical failure analysis model of tunnel vault overburden rock.Using the upper bound method of plastic limit analysis,the theoretical calculation formula of the critical overburden rock thickness of tunnel vault and the supporting force within the tunnel is derived.The influence of different rock mass mechanical parameters and tunnel design parameters on the critical overburden rock thickness of tunnel vault is analyzed.On this basis,considering the influence of different tunnel vault overburden thickness,a comparative study of numerical simulation of soil-rock composite top-layer tunnel excavation was carried out.The study revealed the deformation and failure characteristics of tunnel surrounding rock under different vault overburden thickness,and compared with the theoretical results to verify the effectiveness of the theoretical method in this paper.The research results of this paper can provide theoretical reference for deformation control and support design of surrounding rock of tunnel in soil-rock composite stratum.

关 键 词：土岩复合地层 暗挖隧道 覆岩厚度 极限分析 数值模拟 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]