渭武高速木寨岭隧道大变形控制技术研究  

Research on Large Deformation Control Technology in Muzhailing Tunnel of Weiyuan-Wudu Expressway

作　　者：陈文渊 CHEN Wenyuan(China Railway 21st Bureau Group 3rd Engineering Co.Ltd.,Xianyang Shaanxi 712000,China)

机构地区：[1]中铁二十一局集团第三工程有限公司,陕西咸阳712000

出　　处：《铁道建筑技术》2024年第8期153-157,共5页Railway Construction Technology

基　　金：中铁二十一局集团有限公司科研开发项目(2017B-3)。

摘　　要：针对传统被动支护体系在大变形隧道中常会发生破坏、侵限等工程问题,依托渭武高速木寨岭隧道工程,对基于预应力锚索的主动支护体系采用数值模拟和理论分析相结合的方法,提出大变形支护强度匹配和变形协调综合设计方法,并对主动支护体系大变形控制效果进行研究。结论表明:(1)支护结构强度需与围岩压力相匹配,支护应综合提供1~2 MPa的支护力以实现变形控制;(2)利用预应力锚索的伸长量配合初支无仰拱开口式设计,允许支护结构与围岩协调变形,释放部分围岩压力,可有效避免支护结构发生破坏。木寨岭3#斜井现场应用结果表明:基于预应力锚索的主动支护技术在隧道变形控制和支护破坏控制方面均达到了预期效果,验证了支护体系的有效性。Traditional passive support systems often encounter engineering problems such as support damage and clearance violation in large deformation tunnels.Relying on the Muzhailing Tunnel project of the Weiyuan-Wudu Expressway,an active support system based on prestressed anchor cables was proposed using numerical simulation and theoretical analysis methods.A comprehensive design method for strength matching and deformation coordination of large deformation support was proposed,and the control effect of large deformation of the active support system was studied.The conclusion shows that:(1)the strength of the support structure needs to match the pressure of the surrounding rock,the support should provide a comprehensive support force of 1-2 MPa to achieve deformation control;(2)by utilizing the elongation of prestressed anchor cables in conjunction with the opening primary support without inverted arch,it allows for coordinated deformation between the support and surrounding rock,releasing some of the surrounding rock pressure,and effectively avoiding damage to the support structure.The on-site application results of Muzhailing 3#inclined shaft show that the active support system based on prestressed anchor cables has achieved the expected results in tunnel deformation control and support failure control,verifying the effectiveness of the support system.

关 键 词：大变形 主动支护 预应力锚索 变形控制 数值分析 

分 类 号：U457.2[建筑科学—桥梁与隧道工程]