(1. School of Civil Engineering，Central South University，Changsha，Hunan 410075，China；
2. Yunnan Li Xiang Expressway Investment and Development Co. Ltd.，Kunming，Yunnan 650217，China)
Abstract：Carbonaceous slate is a typical complex rock mass commonly found in the southwestern region. Carbonaceous slate is prone to large deformation and partial collapse during tunnel excavation，and even causes major economic losses and casualties. Taking the Haibaluo Tunnel of the Xiangli expressway as an example，the mechanical characteristics of the large deformation section of the carbonaceous slate tunnel during different stages of the whole construction were investigated based on field monitoring of the displacement of surrounding rock and the internal force of the primary and secondary linings. The research results show that the excavation of the upper step is the main deformation stage of the surrounding rock，and that the deformation of the surrounding rock presents an asymmetrical deformation mode of“smaller at the left and larger at the right” with a maximum settlement(208.9 mm) at the right shoulder. The stress distribution of steel supports along the circumference is“larger at the upper and smaller at the lower”，and the maximum compressive stresses of the upper and lower steps are respectively 550.4 MPa and 134.9 MPa. The safety factors of the vault，the left and right arch shoulders of the primary support and the left invert arch of the secondary lining concrete are less than the limit values. The research results can provide an useful reference for the design，construction of similar projects in the future.
郭 健1，阳军生1，陈 维2，沈 东1，刘 涛2，柴文勇1. 基于现场实测的炭质板岩隧道围岩大变形与衬砌受力特征研究[J]. 岩石力学与工程学报, 2019, 38(4): 832-841.
GUO Jian1，YANG Junsheng1，CHEN Wei2，SHEN Dong1，LIU Tao2，CHAI Wenyong1. Research on large deformation of surrounding rock and mechanical characteristics of lining of carbonaceous slate tunnel based on#br#
field measurement. , 2019, 38(4): 832-841.
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2019, Vol. 38 
