基于拱效应的软岩大断面隧道锚杆作用效应研究  

Support Mechanism Behavior of Bolts for Large Cross-section Tunnel in Soft Rock Based on Arch Effect

作　　者：何本国[1] 张志强[1] 阚呈[1] 曹苏亚[1] 李俊逸[1] 

机构地区：[1]西南交通大学交通隧道工程教育部重点实验室,成都610031

出　　处：《武汉理工大学学报》2013年第1期103-107,共5页Journal of Wuhan University of Technology

基　　金：国家自然科学基金(51278427;51078318);新世纪优秀人才支持计划(NCET-10-0667);铁道部科技研究开发重大项目(2009G020-B-1);中央高校基本科研业务费专项资金(SWJTU11ZT33);教育部创新团队发展计划(IRT0955)

摘　　要：研究了锚杆在软岩隧道施工过程中不同部位锚杆荷载传递和动态调控过程。施工初期主要依靠拱部锚杆来促进拱效应形成,最大轴力先升高而后逐渐降低,中性点向围岩深部移动,形成动态"压力拱"现象,建议客运专线软岩大断面隧道拱部只需打设短锚杆或注浆可有效促进拱效应形成,控制隧道围岩稳定性。It has been a focus under debate on supporting effect of bolt in soft rock for a long time. Loading transfer and dynamic regulation of bolting for different positions were studied during construction. Formation of arch effect de- pends on vault bolt basically at the initial stages of excavation. The maximum axial force of vault bolt rises firstly and then decreases gradually. The neutral point position moves to tunnel. Dynamic arch effect is formed. Bolting or short bolts can make arch effect formed effectively and improve the tunnel stability integrally.

关 键 词：大断面隧道 锚杆 中性点 拱效应 施工力学 

分 类 号：TU453[建筑科学—岩土工程]