Virtual Supporting Force Method for Tunnel Support Timing Based on the Concept of Active Deformation Control of Surrounding Rock

被引：0
|
作者：
Zhou Z. [1 ]
He C. [1 ]
Chen Z. [1 ]
Ma W. [2 ]
Wang B. [1 ]
Zou W. [2 ]
机构：
[1] Key Laboratory of Transportation Tunnel Engineering of Ministry of Education, Southwest Jiaotong University, Chengdu
[2] Railway Engineering Research Institute, China Academy of Railway Sciences Corporation Limited, Beijing
来源：
Zhongguo Tiedao Kexue/China Railway Science | 2022年 / 43卷 / 06期
关键词：
Active deformation control; Advanced support; Primary support; Support system; Support timing; Tunnel;
D O I：
10.3969/j.issn.1001-4632.2022.06.09
中图分类号：
学科分类号：
摘要：
Based on the longitudinal space and time effects of tunnels, a virtual supporting force method for solving the tunnel support timing was constructed to achieve the purpose of active deformation control of the surrounding rock by adjusting the support timing. According to the Drucker-Prager yield criterion, the support timing control standard was established using the overall safety factor of the free surface unit of surrounding rock, and the problem of longitudinal space of tunnel was transformed into that of time using the assumption of fixed tunneling rate of tunnel face. Based on the relationship between the stress release rate and the overall displacement completion coefficient of the surrounding rock and the longitudinal propulsion of the tunnel face, the mechanical model and the virtual supporting force method for solving the support timing of the support system (primary support or advanced support) were proposed. Relying on the Maoxian tunnel of Chengdu-Lanzhou Railway, the maximum support timing of the support system with different surrounding rock levels, different buried depths and different lateral pressure coefficients was solved, respectively. Comparing the monitoring results of tunnel deformation with the calculation results obtained by the solution method with and without the advanced support, the effectiveness of the method was verified. The results show that the safety factors of the vault and the bottom are larger than those of the waist for the level Ⅲ surrounding rock of the tunnel. The level of surrounding rock has the greatest influence on the support timing, followed by the stress level and the buried depth, respectively. The absolute error between the calculation results obtained by the solution method and the measured results of the tunnel is only 1.3 cm. The support timing has a significant effect on the active control of surrounding rock deformation. © 2022, Editorial Department of China Railway Science. All right reserved.
引用
收藏
页码：76 / 88
页数：12
相关论文
共 24 条
  • [1] FANG Xinghua, YANG Zeng, YANG Junsheng, Et al., Large Deformation Characteristics and Control Measures of Surrounding Rock in Altered Granite Stratum of High Ground Stress Tunnel, China Railway Science, 41, 5, pp. 92-101, (2020)
  • [2] CHEN Z Q, HE C, YANG W B, Et al., Impacts of Geological Conditions on Instability Causes and Mechanical Behavior of Large-Scale Tunnels: a Case Study from the Sichuan-Tibet Highway, China [J], Bulletin of Engineering Geology and the Environment, 79, 7, pp. 3667-3688, (2020)
  • [3] MENG Wei, HE Chuan, YAN Qixiang, Et al., Application of p-Value Approach in Inversion of Initial Geo-Stress Field of Rock Masses, China Railway Science, 42, 1, pp. 71-79, (2021)
  • [4] TIAN Siming, WANG Wei, TANG Guorong, Et al., Study on Countermeasures for Major Unfavorable Geological Issues of Tunnels on Sichuan-Tibet Railway, Tunnel Construction, 41, 5, pp. 697-712, (2021)
  • [5] WANG Bo, YU Wei, LIU Jinchao, Et al., Timely-Active Support Theory and Its Application in Transportation/Hydraulic Tunnels Based on Pre-Stressed Anchorage System, China Journal of Highway and Transport, 33, 12, pp. 118-129, (2020)
  • [6] ZHENG Gang, PAN Jun, CHENG Xuesong, Et al., Passive Control and Active Grouting Control of Horizontal Deformation of Tunnels Induced Neighboring Excavation, Chinese Journal of Geotechnical Engineering, 41, 7, pp. 1181-1190, (2019)
  • [7] KANG Hongpu, JIANG Pengfei, HUANG Bingxiang, Et al., Roadway Strata Control Technology by Means of Bolting-Modification-Destressing in Synergy in 1, 000 m Deep Coal Mines, Journal of China Coal Society, 45, 3, pp. 845-864, (2020)
  • [8] (1993)
  • [9] YANG Ling, HAN Lijun, WEI Liyuan, Research on Tunnel Supporting Time Based on Virtual Supporting Force, Modern Tunnelling Technology, 49, 1, pp. 66-71, (2012)
  • [10] SU Kai, CUI Jinpeng, ZHANG Zhimin, Method of Choosing Initial Supporting Time during Tunnel Excavations, Journal of Central South University: Science and Technology, 46, 8, pp. 3075-3082, (2015)
123