摘要
基于损伤效应,采用有限元软件建立隧道洞口段三维数值模型,并结合现场监测分析考虑与不考虑损伤范围两种情况下麻栗垭隧道洞口段稳定性与安全性.由爆破实验结果得出爆破损伤影响范围约为5.0m,通过与现场监测数据对比可知,考虑围岩损伤效应后数值模拟能更准确反映围岩应力、应变分布规律.经检验,工程支护体系具有足够的安全度.考虑损伤效应后的模拟结果与现场监测值更加符合,拱顶沉降和周边收敛误差分别减小了12.1%和32.8%,数值模拟误差明显降低.运用监控量测与数值模拟相互印证的方法可以更准确地分析隧道结构的稳定性,更好地指导施工,从而为麻栗垭隧道及类似地质下的隧道设计和施工提供理论依据.
Based on the damage effects of rocks and combine the finite element method with field tests ,stability and safety of Maliya tunnel were analyzed under the conditions of damage and no dam-age .Blasting test shows that the influence range of blasting damage is about 5 .0 m .By comparing monitored data and calculation results ,the model considering damage can reflect the law of strain and stress distribution of surrounding rocks more accurately .The support system has enough degree of safety by inspection . The deviation of vault settlement and convergence are reduced by 12 .1% and 32 .8% respectively and the error in numerical simulation has been optimized .The combination of nu-merical simulation and field test can precisely analysis the stability of structure and efficiently guide construction .The analysis results can provide technical guidance for the design and construction of Maliya tunnel and the tunnel which has the similar to pographical and geologic conditions .
作者
吴小萍
唐冬冬
费广海
杨献章
Wu Xiaoping Tang Dongdong Fei Guanghai Yang Xianzhang(l School of Civil Engineerin National Engineering Laboratory for High Speed Railway Construction, Central South University, Changsha 410075, China Hunan Zhang-sang Expressway Construction and Development Co. Ltd. , Zhangjiajie 427000, Hunan China)
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2016年第12期25-30,共6页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
中国铁路总公司科技研究开发计划资助项目(2014G005-A)
湖南省交通科技项目(201436)
关键词
浅埋偏压隧道
爆破
损伤效应
损伤范围
数值模拟
shallow tunnel under unsymmetrical pressure
blasting
damage effect
damage zone
numerical simulation
