Rock and Soil Mechanics ›› 2020, Vol. 41 ›› Issue (12): 4045-4053.doi: 10.16285/j.rsm.2020.5436

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Mechanism research of a new constant resistance yielding device for tunnels

ZHANG Chuan-qing1 , LÜ Hao-an1, 2, LIU Xiao-yan1, 2, ZHOU Hui1 , GAO Yang1 , YAN Dong-ming3   

  1. 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China 2. University of Chinese Academy of Sciences, Beijing 100049, China 3. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou, Zhejiang 310058, China
  • Online:2020-12-11 Published:2021-04-29
  • Contact: LÜ Hao-an, male, born in 1996, Postgraduate, majoring in underground engineering support and numerical calculation. E-mail:
  • About author: ZHANG Chuan-qing, male, born in 1977, PhD, Professor, PhD supervisor, mainly engaged in research on deep rock mechanics and deep disaster prevention.
  • Supported by:
    the Yalong River Joint Fund of the National Natural Science Foundation of China(U1865203), the National Natural Science Foundation of China(51709257) and the Hubei Province Natural Science Foundation Innovation Group(2018CFA013).

Abstract: The constant resistance yielding support is the ideal form of support for squeezing tunnel. Current technology is difficult to satisfy the safety requirements of high bearing capacity, large deformation and load stability at the same time. In response to this problem, the constant resistance yielding device based on the principle of tension-compression conversion (CRYD-TCC) was developed inspired by the metal drawing process in combination with the working characteristics of steel arch support. In this paper, the working principle of the CRYD-TCC was discussed, and its mechanical response law and characteristics were analyzed. Through the indoor test and numerical simulation, the influence of the design parameters was analyzed, and the performance measurement index of the CRYD-TCC was determined. The analysis shows that: 1) The CRYD-TCC can constantly resist deformation under pressure; when installed in the steel arch joint allowing it to be part of the steel arch, the device can ensure the stability of the arch, improve its large deformation adaptability while providing constant support for the surrounding rock. 2) Based on the four design parameters: the cone angle, the friction coefficient, the cross-section shrinkage rate and the diameter of the pressure bar, the device can realize pressure resistance and pressure control with satisfactory load stability, which can provide important technical support for soft-rock tunnel large deformation and the stability control of support.

Key words: yielding support, squeezing large deformation, constant resistance yielding device, numerical simulation