西南交通大学学报 2005, 40(6) 759-764 DOI:     ISSN: 0258-2724 CN: 51-1277/U

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隧道式复合锚碇
预应力岩锚
原位试验
数值模拟
本文作者相关文章
汪海滨
高 波
PubMed
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隧道式复合锚碇的作用机理

汪海滨;高 波

西南交通大学土木工程学院,四川成都610031

摘要

采用原位模型试验和有限元(ANSYS软件)数值分析,研究了悬索桥带预应力岩锚的隧道式锚碇系统的 承载机理,根据施工动态过程反演确定关键参数.锚碇-围岩、岩锚-注浆体-围岩相互作用力学行为采用无厚度接 触单元模拟.结果表明,岩锚初始预应力控制着锚碇体和岩锚对主缆荷载的分担和参与时机,岩锚存在最小自由 段长度,以均匀分布和传递围岩应力,形成岩石锚固墙新围压效应.

关键词 隧道式复合锚碇   预应力岩锚   原位试验   数值模拟   

Load-BearingM echanism ofCompound TunnelAnchorage

WANGHai-bin;GAO Bo

School ofCivilEng., Southwest JiaotongUniversity, Chengdu 610031, China

Abstract:

Based on a field test and FEM( finite elementmethod) numerical simulation, the load- bearingmechanism of the tunnelanchorage system ofsuspension bridgeswith pre-stressed anchor cable was investigated. The key parameters were determined through the back-analysis of the dynamic construction process. In the numerical simulation, interactions between anchorage and rockmass and between anchor cable, grout and rockmasswere simulated with zero-thickness contact elements. The research indicates that the initial pre-stress and free length of anchor cable determine the loads participated by anchor cable and anchorage on the tunnel anchorage system and their load-bearing occasion. There exists a least free length ofanchor cable to form a new confining pressure effect—rock anchoredwall to transfer and distribute stresses uniformly in rockmass.

Keywords: pre-stressed anchor cable   field test   numerical simulation    compound tunnel anchorage  
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