Protective structure and support system and method for controlling deformation and damage of tunnel surrounding rock

Abstract

The invention discloses a protective structure and supporting and protecting systems for controlling tunnel surrounding rock deformation and failure and a construction method thereof. The protective structure comprises two pressing plates which are spaced at a set distance, a buffering and damping device is fixed between the two pressing plates, the buffering and damping device and the two pressing plates are fixed to be of an integrated structure, the structure is arranged between the supporting and protecting systems of two sections of tunnel surrounding rock, and the two pressing plates are connected with the supporting and protecting systems of the two sections of tunnel surrounding rock respectively. According to the protective structure and the supporting and protecting systems, through arrangement of the rigid pressing plate on the upper layer, flexible air bags and springs on the middle layer and the rigid pressing plate on the lower layer, the rigid-flexible combined supporting and protecting systems are achieved, and the tunnel construction safe requirements under the soft and fractured geological conditions such as the loose soil texture, the upper soft and lower hard soil texture, the water-enriched and soft soil texture and the swell-shrink soil texture; the supporting and protecting systems can reduce the pressure of soil laid on the tunnel face, reduce an arch apex and ground surface settlement, improve the self-stabilization capacity of the surrounding rock and lower the construction cost and difficulty, the construction technology is simple and can be easily operated by constructors, and the working efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering, in particular to a protection structure, a support system and a method for controlling deformation and damage of tunnel surrounding rock. Background technique [0002] In the construction of tunnel projects under soft and broken geological conditions such as loose soil, soft top and bottom hard, water-rich soil and expansion-contraction soil, if the initial deformation and stability of the tunnel surrounding rock cannot be effectively controlled, the tunnel construction and its surrounding areas will be affected. The environment has extremely adverse effects, and in severe cases, it will lead to instability and damage to the surrounding rock of the tunnel, endangering the safety of workers and the orderly progress of construction. Tunnel surrounding rock in soft and broken geological areas such as loose soil, soft top and hard bottom, water-rich soft and expansion-contraction soi...

AI Technical Summary

Problems solved by technology

However, the application of prestress limits the self-stabilizing deformation of the surrounding rock at the initial stage of tunnel excavation, cannot make full use of the self-supporting capacity of the surrounding rock, increases the stress of the initial support system, and is not conducive to the structural safety during the operation period.

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