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.
Based on a field test and FEM（finite element method） numerical simulation, the loadbearing mechanism of the tunnel anchorage system of suspension bridges with pre-stressed anchor cable was investigated. The key construction process. In the parameters were determined through the back-analysis of the dynamic numerical simulation, interactions between between anchor cable, grout and rockmass were 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 occasion. There exists a least free length of anchor cable to form a new system and their load-bearing confining pressure effect-rock anchored wall to transfer and distribute stresses uniformly in rockmass.
出处
《西南交通大学学报》
EI
CSCD
北大核心
2005年第6期759-764,共6页
Journal of Southwest Jiaotong University
基金
西藏交通厅资助项目(200309)
关键词
隧道式复合锚碇
预应力岩锚
原位试验
数值模拟
compound tunnel anchorage
pre-stressed anchor cable
field test
numerical simulation
作者简介
汪海滨（1971-），男，高级工程师，博士：趼究生，主要研究方向为隧道、桥梁和岩土工程施工力学．
