关键词:

挤压性围岩, 隧道, 让压技术, 让压节点, 可让式支护

Abstract:

In order to solve the problem that the initial support structure of the tunnel is damaged due to deformation of soft rock under high ground stress, the pressure relief technology of surrounding rock is studied, and a pressure relief joint that can relief the support displacement and reduce the pressure of the surrounding rock is proposed. Based on the finite element simulation and the 1:1 prototype joint axial loading test, the influence of bolt preload and groove shape on the working performance of the pressure relief joint is analyzed. The analysis results show that: (1) The pressure joint can be set in a manner The deformation is released, and the resistance against deformation is stable; (2) The preload and the shape of the chute have a significant effect on the performance of the pressure relief joint. The greater the preload, the narrower the chute, and the higher the sliding resistance; (3) Diameter shrinkage The chute type consumes a lot of energy and has a high safety reserve. The pressure relief joint has the function of releasing the energy of the surrounding rock and can provide stable resistance during the working process, which can provide a reference for the pressure relief technology of the tunnel.

Key words: extruded surrounding rock, tunnel, pressure relief technology, pressure relief joint, yielding support