锚杆支护对砂泥岩地层铁路隧道仰拱变形及受力的影响  

Influence of Bolt Support on Inverted Arch Deformation and Stress of Railway Tunnel in Sand-mudstone Stratum

作　　者：赵进文 刘占博 王俊杰 张海龙[4] ZHAO Jinwen;LIU Zhanbo;WANG Junjie;ZHANG Hailong(College of River and Ocean Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Power China Huadong Engineering Limited Corporation,Hangzhou 310058,China;School of Materials Science and Engineering,Chongqing Jiaotong University,Chongqing 400074,China;School of Civil Engineering,Chongqing University of Arts and Sciences,Chongqing 402160,China)

机构地区：[1]重庆交通大学河海学院,重庆400074 [2]中国电建集团华东勘测设计研究院有限公司,杭州310058 [3]重庆交通大学材料科学与工程学院,重庆400074 [4]重庆文理学院土木工程学院,重庆402160

出　　处：《铁道建筑》2024年第7期106-110,共5页Railway Engineering

基　　金：重庆市建设科技项目(城科字2022第8-12号);重庆交通大学市级研究生联合培养基地项目(JDLHPYJD2020026)。

摘　　要：以成渝中线(成都—重庆)某砂泥岩地层隧道为例,采用数值模拟研究锚杆支护参数对仰拱竖向变形、受力的影响。结果表明:在仰拱处施加锚杆能有效提高支护结构与底部岩层的完整性,减小仰拱竖向变形及受力;单个锚杆有效控制面积对仰拱竖向变形、受力有影响,综合考虑推荐锚杆间距×排距为1.2 m×1.4 m,即单个锚杆有效控制面积为1.68 m2方案;随着锚杆长度增加仰拱竖向变形、受力均减小,但锚杆长度大于4.5 m后锚杆长度增加对仰拱变形、受力影响不明显。在依托工程仰拱处施加长4.5 m、间距×排距为1.2 m×1.4 m的锚杆,对仰拱竖向变形、受力的控制效果良好。施加锚杆支护后仰拱竖向变形、受力的数值模拟结果与工程实际监测情况相符。Taking a tunnel in the middle line of Chengdu-Chongqing in sand-mudstone stratum as an example,the influence of bolt support parameters on the vertical deformation and stress of the inverted arch were studied by numerical simulation.The results show that,the application of bolts at the inverted arch can effectively improve the integrity of the supporting structure and the bottom rock formation,and reduce the vertical deformation and stress of the inverted arch.The effective control area of bolt has direct impacts on vertical deformation and stress of the inverted arch,and the optimal space of bolts is 1.2 m×1.4 m(effective control area of the bolt is 1.68 m2).With the increase of the bolt length,the vertical deformation and stress of the inverted arch decrease.The deformation and stress of inverted arch are not obviously affected when the length of the bolt is more than 4.5 m.The bolts scheme is applied at the inverted arch of the railway tunnel with the 4.5 m length and 1.2 m×1.4 m space,which has a good effect on controlling the vertical deformation and stress of inverted arch,and is consistent with the actual monitoring situation of the project.

关 键 词：铁路隧道 砂泥岩地层 数值模拟 仰拱 变形控制 锚杆有效控制面积 锚杆长度 

分 类 号：U459.1[建筑科学—桥梁与隧道工程]