公路隧道中系统锚杆的功效研究  

Study of efficacy of systematic anchor bolts in highway tunnels

作　　者：陈力华[1,2] 林志[2] 李星平[2] 

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]招商局重庆交通科研设计院有限公司,重庆400067

出　　处：《岩土力学》2011年第6期1843-1848,共6页Rock and Soil Mechanics

基　　金：西部交通建设科技项目"公路隧道松弛荷载预测理论与预警系统及设计方法研究"资助(No.200631874024)

摘　　要：系统锚杆是锚喷支护的重要组成部分,目前广泛应用到公路隧道的初期支护中。然而,系统锚杆到底对隧道结构的稳定起到多少作用一直没有有效的定量计算方法。以某高速公路隧道为例,用有限元强度折减法计算了不同地质条件下锚杆对隧道安全系数大小的影响。结合有限元数值模拟,通过对锚杆各种效应的分析后得到如下结论:在很多地质条件下锚杆对公路隧道稳定性影响不大,建议在有条件的情况下可以逐步开展取消系统锚杆的工程试验验证,为公路隧道不设置系统锚杆提供更多的工程依据。A support structure of systematic anchor bolts is a key part in the system of shotcrete-bolt suppcrts,and it is widely used in preliminary bracing of hiqhway tunnel at present.However,there is no effective quantitative way to calculate the role of the systematic anchor bolts for the stability of tunnel structure.Taking a certain expressway tunnel for example,the influence of anchor bolts on safety factors of tunnels under different geological conditions is calculated with FEM strength reduction method.Together with FEM numerical simulating and analysis to various kinds of effects from anchor bolts,conclusions can be drawn as follows.The anchor bolts have little influence on stability of expressway tunnel under much more geological conditions;therefore,it is suggested that experimental verification of canceling the systematic anchor bolts should be carried out gradually if possible,so as to provide more engineering basis for canceling anchor bolts in highway tunnels.

关 键 词：隧道 有限元强度折减法 安全系数 系统锚杆 

分 类 号：U451[建筑科学—桥梁与隧道工程]