Energy-absorption yield tunnel support system and method suitable for weak broken wall rock

Abstract

The invention discloses an energy-absorption yield tunnel support system and method suitable for weak broken wall rock. The system comprises a plurality of grid steel frames. The grid steel frames are consistent with the section of a tunnel in shape and of a sealed structure. Steel tubes are disposed in the grid steel frames and connected with the same through sealed yield energy-absorption devices. The combined supports formed by the grid steel frames, the steel tubes and the yield energy-absorption devices are disposed in the tunnel in an equal-interval manner. Adjacent combined supports are connected through longitudinal beams. Reserved holes are symmetrically formed in the longitudinal beams at intervals. Anchor rods or anchor cables for applying prestress are anchored into rock stratums through the reserved holes so as to form a three-dimensional integral support from the wall rock. The system has the advantage that the problem of instability and failure, caused by large wall rock deformation due to the fact that the weak broken wall rock is subjected to long-term train dynamic load, earthquake load and faulting load, of the support system is solved.

Description

technical field [0001] The present invention relates to a new type of tunnel support structure for absorbing and allowing pressure and its implementation method, in particular to a tunnel support structure system suitable for weak and broken surrounding rock under the action of train dynamic load, earthquake load and fault active load for a long time and its implementation method. Background technique [0002] In order to maintain the rapid and healthy development of my country's economy, realize the transformation of the economic structure system smoothly, and open up the blood vessels connecting the economic lifelines of various regions - expressways, railways, and subways - it is imminent. To get rich, build roads first, and the country has increased the construction of traffic roads in various regions. In recent years, no matter whether it is to increase the intensity of western development or to alleviate the urban traffic pressure, urban subways are being built in ful...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the surrounding rock of this type of tunnel is subjected to train dynamic load, earthquake load and fault active load for a long time, the large deformation of the surrounding rock leads to the instability and damage of the support system. For tunnels with weak and broken surrounding rocks under the action of earthquake load and fault active load, the supporting structure is composed of core tube and steel grid, which has the characteristics of pressure absorption and pressure reduction; at the same time, the implementation method of this structure is introduced in detail.

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