Experimental study on primary lining form of tunnels in phyllite on Chengdu—Lanzhou railway
Li Lei1 Tan Zhongsheng1 Yu Yu2 Jiang Bo2 Zhang Mengjin3
1. Beijing Jiaotong University， Beijing 100044， China
2. China Railway Eryuan Engineering Group Co., Ltd., Chengdu 610031, China
3. China Railway 17 Bureau Group Co., Ltd., Taiyuan 030006, China
Abstract：The large deformation of surrounding rocks is easily caused by excavating tunnels in squeezing soft rocks. It is very important to control the large deformation of soft rock by selecting the reasonable steel frame of the initial support. In this paper, based on the Maoxian tunnel of Chengdu-Lanzhou railway, through the field test and numerical calculation, the selection of the primary support steel frame of the tunnel with large deformation of the squeezing soft rock is studied. The main conclusions are as follows: (1) The steel frame with low strength should not be used as the first layer support of tunnel in squeezing soft rock, and the first layer support should be able to ensure the reasonable shape of the tunnel. (2) The tunnel with large squeezing deformation should be supported by multiple layers and multiple supports, and the stress of surrounding rock should be released to ensure the long-term stability of the tunnel. (3) The excavation of the tunnel with large deformation is mainly caused by partial excavation method, which can easily lead to the uneven stress of the supporting structure, and the support should be closed rapidly in advance to improve the structural stress.
李磊 谭忠盛 喻渝 姜波 张孟金. 成兰铁路千枚岩隧道初期支护形式试验研究[J]. 土木工程学报, 2017, 50(S1): 19-24.
Li Lei Tan Zhongsheng Yu Yu Jiang Bo Zhang Mengjin. Experimental study on primary lining form of tunnels in phyllite on Chengdu—Lanzhou railway. 土木工程学报, 2017, 50(S1): 19-24.
