The deformation and mechanical properties of surrounding rock of primary support arch-cover construction method in upper-soft and lower-hard stratum
KONG Chao1，2，GAO Xinqiang3，YAO Yong1，2，ZHU Xiaoyu1，2，ZHANG Junru4
(1. Civil Engineering and Architecture，Southwest University of Science and Technology Civil，Mianyang，Sichuan 621000，China；
2. Shock and Vibration of Engineering Materials and Structures Key laboratory of Sichuan Province，Southwest University of Science and Technology Civil，Mianyang，Sichuan 621010，China；3. School of Civil Engineering，Shijiazhuang Tiedao University，Shijiazhuang，Hebei 050043，China；4. Key Laboratory of Transportation Tunnel Engineering，Ministry of Education，Southwest Jiaotong University，Chengdu，Sichuan 610031，China)
Abstract：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.
孔 超1，2，高新强3，姚 勇1，2，朱晓雨1，2，张俊儒4. 上软下硬复合地层初支拱盖法围岩变形与力学特性研究[J]. 岩石力学与工程学报, 2020, 39(S1): 2634-2644.
KONG Chao1，2，GAO Xinqiang3，YAO Yong1，2，ZHU Xiaoyu1，2，ZHANG Junru4. The deformation and mechanical properties of surrounding rock of primary support arch-cover construction method in upper-soft and lower-hard stratum. , 2020, 39(S1): 2634-2644.
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2020, Vol. 39 
