摘要
调查分析了矮寨特大悬索桥茶洞岸岩体施工期间所暴露的地质缺陷及稳定问题;采用三维数值分析方法,计算了在岩体开挖后、施加主缆荷载后等工况下,隧道锚、索塔基础与公路隧道围岩及山体的稳定性,及构筑物相互影响;提出了工程支护的措施。研究结果表明:岩体稳定问题主要集中在桥台边坡上,施加工程设计荷载不会对岩体稳定造成明显影响,构筑物之间相互影响不大;隧道锚因围岩挤压效应而产生强大的抗拔能力,其承载能力可能被严重低估。
Geological defects and stability problems of Chadong bank of Aizhai Super Suspension Bridge exposed in the excavation are investigated and analyzed.Based on these,by means of three-dimensional numerical analysis,surrounding rock stability of tunnel-type anchorage,caber tower and highway tunnel,as well as mountain stability are analyzed in different construction stages,including the condition stage after the rock mass excavation and the exertion of design load.Rock mass reinforcement is designed based on the results of numerical analysis.Analysis results show that stability problems focus on the stability of abutment slope,the influence of the design load on stability of rock mass is very limited,and mutual effects between structures are also limited.Tunnel-type anchorage can generate very huge pull-resistance force,which is caused by surrounding rock mass＇ ＇squeezing effect＇ and the bearing capacity of tunnel-type anchorage may be underestimated severely.
出处
《重庆交通大学学报（自然科学版）》
CAS
北大核心
2011年第6期1298-1302,共5页
Journal of Chongqing Jiaotong University(Natural Science)
基金
交通运输部西部交通建设科技项目(200631879846)
关键词
矮寨特大悬索桥
隧道式锚碇
岩体稳定分析
岩体加固
地质分析
Aizhai Super Suspension Bridge
tunnel-type anchorage
rock mass stability analysis
rock mass reinforcement
geological analysis
