上软下硬复合地层初支拱盖法围岩变形与力学特性研究  

The deformation and mechanical properties of surrounding rock of primary support arch-cover construction method in upper-soft and lower-hard stratum

作　　者：孔超 高新强 姚勇[1,2] 朱晓雨 张俊儒[4] KONG Chao;GAO Xinqiang;YAO Yong;ZHU Xiaoyu;ZHANG Junru(Civil Engineering and Architecture,Southwest University of Science and Technology Civil,Mianyang,Sichuan 621000,China;Shock and Vibration of Engineering Materials and Structures Key laboratory of Sichuan Province,Southwest University of Science and Technology Civil,Mianyang,Sichuan 621010,China;School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang,Hebei 050043,China;Key Laboratory of Transportation Tunnel Engineering,Ministry of Education,Southwest Jiaotong University,Chengdu,Sichuan 610031,China)

机构地区：[1]西南科技大学土木工程与建筑学院,四川绵阳621000 [2]西南科技大学工程材料与结构冲击振动四川省重点实验室,四川绵阳621010 [3]石家庄铁道大学土木工程学院,河北石家庄050043 [4]西南交通大学交通隧道工程教育部重点实验室,四川成都610031

出　　处：《岩石力学与工程学报》2020年第S01期2634-2644,共11页Chinese Journal of Rock Mechanics and Engineering

基　　金：中国铁路总公司科技研发计划系统性重大项目(P2018G007);河北省教育厅重点项目(ZD2017248)。

摘　　要：以贵阳地铁二号线阳明祠单拱大跨地铁车站为背景,对上软下硬复合地层初支拱盖法施工力学特性进行研究,通过开展相似比为1︰50的室内模型试验,结合有限元极限分析法,对比分析不同工况下初支拱盖施工过程中围岩变形规律以及拱盖结构极限承载能力,研究结果表明:(1)拱盖能够有效抑制围岩及初支变形,特别是隧道下部开挖阶段;(2)合适的拱盖施做时机能够保证各施工步序转换过程中围岩及支护变形的平稳发展;(3)拱盖拱脚处围岩强度及隧道下部(边墙和底板)支护结构是决定拱盖承载能力的关键;(4)有限元极限分析法所得结果与室内试验结果吻合较好,可以作为室内试验的补充分析。研究成果可为初支拱盖法的设计及施工提供理论指导。The model test(similar ratio:1︰50)has been implemented based on the Yangmingci subway station,and the finite element limit analysis method has been applied.The law of surrounding rock deformation,progressive failure mode and ultimate bearing capacity has been studied.The results show that:(1)The arch cover can effectively restrain the deformation of surrounding rock,especially in the lower excavation stage of tunnel.(2)The deformation of surrounding rock and support can be developed smoothly during the construction sequence by the appropriate timing of arch cover application.(3)The strength of surrounding rock at the arch foot and the side wall and invert are the key to ensure the bearing capacity of the tunnel with arch cover.(4)the results obtained by the finite element limit analysis method are in good agreement with the results of the model test,which can be used as a supplementary analysis of the laboratory test.The research results can provide theoretical guidance for the design and construction of the primary support arch-cover construction method.

关 键 词：岩石力学 上软下硬复合地层 初支拱盖法 模型试验 有限元极限分析法 施工力学 

分 类 号：TU45[建筑科学—岩土工程]