碎裂挤压兼岩层弯折型大变形隧道研究  

Research on large deformation tunnel with fractured compression and rock layer bending

作　　者：李政辉 Li Zhenghui(China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu Sichuan 610031,China)

机构地区：[1]中铁二院工程集团有限责任公司,四川成都610031

出　　处：《山西建筑》2024年第22期157-159,共3页Shanxi Architecture

摘　　要：依托西南山区某铁路隧道的建设过程,系统研究总结了在水平缓倾岩层中修建隧道,受高地应力影响而产生大变形的作用机理及应对措施,结论表明:高地应力环境下近水平、中薄层和软硬相间岩层的弯曲变形是产生大变形病害的主要原因;碎裂挤压兼岩层弯折型大变形表现为岩性以硬质砂岩为主,岩石的强度较高、节理发育,与强度较低的薄层页岩互层,围岩岩体的整体强度较低,且由于岩层产状近水平,岩层的破坏表现出弯曲折断的特征;针对该隧道水平缓倾岩层,由高地应力引起的弯曲变形,采取加大仰拱矢跨比、设置全环钢架、设置全环长锚杆、二次衬砌全环配置钢筋等措施,能有效地防止隧道出现变形、底鼓问题。This article is based on the construction process of a railway tunnel in the southwestern mountainous area,and systematically studies and summarizes the mechanism and countermeasures of large deformation caused by high ground stress when constructing tunnels in horizontally gently inclined rock layers.The conclusion shows that the bending deformation of near horizontal,medium thin layer,and soft hard alternating rock layers under high ground stress environment is the main cause of large deformation diseases;The large deformation caused by fragmentation compression and rock layer bending is mainly characterized by hard sandstone,with high strength and well-developed joints,interbedded with thin shale with lower strength.The overall strength of the surrounding rock mass is low,and due to the nearly horizontal attitude of the rock layer,the failure of the rock layer shows the characteristics of bending and fracture;In response to the bending deformation caused by high ground stress in the horizontally inclined rock layer of the tunnel,measures such as increasing the rise span ratio of the arch,setting up a full ring steel frame,setting up a full ring long anchor rod,and configuring steel bars for the entire ring of the secondary lining can effectively prevent deformation and floor heave problems in the tunnel.

关 键 词：水平缓倾 高地应力 岩爆 大变形 

分 类 号：TU997[建筑科学—市政工程] U456.1[建筑科学—桥梁与隧道工程]