Tunnel yielding type shoring system

Abstract

The invention discloses a tunnel yielding type shoring system and relates to the field of traffic and mining soft rock large-deformation tunnels. Stretchable units are arranged on a shoulder part and a waist part of each steel arch frame; the stretchable units are connected with the steel arch frame through flanges; each stretchable unit is composed of a stretchable component and a rectangular rubber damper; stretchable components are arranged at the two ends of each steel arch frame; a deforming slot is reserved between the stretchable components; the rectangular rubber damper is arranged in the deforming slot; a separating plate is arranged between the rectangular rubber damper and a sprayed concrete layer; a plurality of yielding anchor rods are arranged on the sprayed concrete layer at intervals. According to the invention, a combined body composed of the yielding anchor rods, the stretchable components, the steel arch frame, the rectangular rubber damper and the sprayed concrete generates uniformly harmonious deformation with the surrounding rock, so that the surrounding rock stability can be effectively maintained by a certain supporting resistance, and meanwhile, the shoring system is allowed to generate a certain displacement, and the functions of shoring, yielding and unloading can be achieved.

Description

technical field [0001] The invention relates to a tunnel yielding support system, which belongs to the technical field of traffic and mining soft rock large deformation tunnels. Background technique [0002] In recent years, with the start of a large number of post-disaster reconstruction projects and the deepening of the western development year by year, more and more tunnel projects have passed through a wide range of soft rock formations, especially through phyllite formations, such as the established Xuefengshan Tunnel, Wangjia Beach Tunnel, Longxi Tunnel, and the Chenglan Railway Tunnel under construction. The phyllite that the above-mentioned tunnels pass through is characterized by poor properties, low strength, and easy softening when exposed to water. Development in the direction of development, the problem of large deformation disasters is highlighted during the construction of soft rock tunnels passing through high geostress areas, which seriously endangers the sa...

AI Technical Summary

Problems solved by technology

[0002] In recent years, with the start of a large number of post-disaster reconstruction projects and the deepening of the western development year by year, more and more tunnel projects have passed through a wide range of soft rock formations, especially through phyllite formations, such as the established Xuefengshan Tunnel, Wangjia Beach Tunnel, Longxi Tunnel, and the Chenglan Railway Tunnel under construction. The phyllite that the above-mentioned tunnels pass through is characterized by poor properties, low strength, and easy softening when exposed to water. The problem of large deformation disasters is highlighted during the construction of soft rock tunnels passing through high geostress areas, seriously endangering the safety of tunnel construction and operation

[0003] There are not many domestic studies on the large deformation of soft rock tunnels. At present, the U-shaped steel retractable arch support is widely used; the soft and expansive surrounding rock of the Tianxinshan Tunnel entrance section of Ganlong Railway adopts flexible and shrinkable I-shaped brackets. steel support; Yang Le, You Chun'an, etc. used grid retractable support in the Lisen Cement long-distance conveying tunnel; each of the above-mentioned supports has some defects of its own, and the shrinkage effect is not ideal. The traditional support Methods and techniques are difficult to solve the problem of large deformation of weak surrounding rock

Images