隧道穿越红黏土接触带初期支护优化研究  

Research on the Optimization of Initial Support Parameters for Tunnel Passing Through Red Clay Contact Zone

作　　者：李雪峰 尚应超 谷笑旭 于介[3] 杨文波[2] 蒋雅君[2] LI Xuefeng;SHANG Yingchao;GU Xiaoxu;YU Jie;YANG Wenbo;JIANG Yajun(The Fifth Engineering Co.Ltd of China Railway First Engineering Group,Xi'an,Shaanxi 710054,China;South west Jiaotong University,Chengdu,Sichuan 610031,China;China Railway First Survey and Design Institute Group Co.Ltd,Xi'an,Shaanxi 710043,China)

机构地区：[1]中铁一局集团第五工程有限公司,西安710054 [2]西南交通大学,成都610031 [3]中铁第一勘察设计院集团有限公司,西安710043

出　　处：《铁道工程学报》2019年第9期49-53,共5页Journal of Railway Engineering Society

基　　金：中国铁路总公司科技研究开发计划课题(2017G007-G)

摘　　要：研究目的:不同岩性接触带地质条件复杂,围岩软硬不均,隧道变形与常规地层隧道有所不同。本文以贾塬隧道穿越红黏土与砂岩夹泥岩接触带地段为依托,建立相应数值模拟分析模型,对初支厚度、拱架间距、锚杆长度和间距在控制围岩变形和初支应力方面的效果进行分析。研究结论:(1)隧道穿越红黏土与砂岩夹泥岩接触带时,开挖扰动引起的洞周变形占总变形量较大;(2)初期支护厚度和钢拱架间距两个参数对隧道变形和初支应力控制效果明显;(3)边墙锚杆的长度和间距对隧道变形影响不明显;(4)该成果可为隧道穿越不同岩性接触带时的支护参数优化提供参考。Research purposes:The geological conditions of different lithologic contact belts are complex,the surrounding rocks are unevenly soft and hard,and the tunnel deformation is different from that of conventional formation tunnels.In this paper,based on the Jiayuan tunnel crossing the contact zone between red clay and sandstone mudstone,the corresponding numerical simulation analysis model is established,the effect of the initial thickness,arch spacing,bolt length and spacing on controlling the surrounding rock deformation and initial stress is analyzed.Research conclusions:(1)When the tunnel passes through the contact zone between red clay and sandstone mudstone,the deformation of the tunnel caused by excavation disturbance accounts for a large amount of total deformation.(2)The effect of the two parameters of initial support thickness and steel arch spacing on controlling the tunnel deformation and initial support stress is obvious.(3)The length and spacing of the side wall anchors have no obvious influence on the tunnel deformation.(4)The result can provide reference for the optimization of support parameters when the tunnel crosses different lithologic contact belts.

关 键 词：不同岩性接触带 应力 变形 数值模拟 初期支护 

分 类 号：U455[建筑科学—桥梁与隧道工程]