文献类型：期刊文献

英文题名：Model test on deformation and failure mechanism of tunnel support with layered rock mass under high ground stress

作者：Zhang, Bo[1];Tao, Zhigang[2];Guo, Pengfei[3];Yang, Kang[4];Yang, Yi[4]

机构：[1]Hebei GEO Univ, Sch Urban Geol & Engn, Shijiazhuang 050031, Peoples R China;[2]China Univ Min & Technol, Sch Mech & Civil Engn, Beijing 100083, Peoples R China;[3]Shaoxing Univ, Sch Civil Engn, Shaoxing 312000, Peoples R China;[4]Guanxi Rd & Bridge Engn Grp Co LTD, Nanning 530200, Peoples R China

年份：2023

卷号：150

外文期刊名：ENGINEERING FAILURE ANALYSIS

收录：SCI-EXPANDED(收录号：WOS:001029544800001)、、EI(收录号：20231914074122)、Scopus(收录号：2-s2.0-85158866010)、WOS

基金：Acknowledgements This research is financially supported by the National Natural Science Foundation of China (No. 41941018)

语种：英文

外文关键词：Tunnel; Floor heave; Physical model test; NPR anchor cable; Field test

外文摘要：To control the large deformation of the Changning Tunnel, based on the constant resistance and energy absorption characteristics of the NPR anchor cable, first, through the physical model test, the mechanics of the NPR anchor cable controlling the deformation of the floor heave was studied, including the temperature field, strain field, and displacement field during the tunnel excavation and loading process. Then, through field tests, the control effect of NPR anchors was studied. The results of the model test show that under the support of NPR anchor cables, with the increase of geostress, the asymmetric deformation of the vault and floor is obvious. During the loading process, the shallow rock mass pressure strain area at both ends of the floor is larger, squeezing the floor and causing strong temperature changes and floor heave failures of the rock mass, while the deep rock mass strain value changes smoothly and is relatively stable. After the axial force of the NPR anchor cable transitions from the growth stage to the stable state, the rock mass deformation converges and stops growing. In the field test, the NPR anchor cable can reduce the primary support deformation from more than 2000 mm to 108 mm, and reduce the stress on the support structure, which is helpful in avoiding the risk of initial support deformation and secondary lining damage in the deep-buried, layered rock mass tunnels.