Composite support device of dynamic pressure softrock tunnel based on steel pipe concrete bracket

Abstract

The invention relates to a composite support device of a dynamic pressure softrock tunnel based on a steel pipe concrete bracket, which comprises a steel pipe concrete bracket, wherein a flexible pressure sharing and releasing layer is arranged between the steel pipe concrete bracket and supported surrounding rock. The composite support device also comprises a surrounding rock grouting and reinforcing device, wherein the surrounding rock grouting and reinforcing device comprises a plurality of hollow surrounding rock grouting anchor rods, and the surrounding rock is grouted by the hollow anchor rods; after being injected with a concrete layer, the surrounding rock is covered by a flexible seal layer; and the steel pipe concrete bracket is provided with a vertical column shaped or Y-shaped or T-shaped high-strength steel pipe concrete strut. The high-strength steel pipe concrete bracket and the flexible pressure sharing and releasing layer are two necessary technologies; and the flexible seal layer, the surrounding rock grouting and reinforcement and the high-strength steel pipe concrete strut are three optional technologies. The flexible pressure sharing and releasing layer is combined with the steel pipe concrete bracket so that the whole support system combines hardness with softness, has simple structure, low cost and high support resistance and can effectively control the stability of large deformed tunnels of deep well softrock dynamic pressure, and the like.

Description

technical field [0001] The invention relates to a support device for a soft rock roadway, in particular to a composite support device for a dynamic pressure soft rock roadway based on a steel tube concrete support. Background technique [0002] With the increase of coal mine mining depth, the problem of soft rock is becoming more and more serious, and the support problem of dynamic pressure soft rock roadway is becoming more and more prominent. The characteristics of dynamic pressure soft rock roadway include the following three aspects: first, the rock mass environment where the surrounding rock is located, which is characterized by weak, broken, loose rock mass, complex structural stress, and frequent disturbances; and mechanical properties, manifested as low rock strength, severe weathering, large rheology, and large expansion; third, the engineering characteristics of the surrounding rock, which are manifested in the strong pressure from the roadway, and the deformation ...

AI Technical Summary

Problems solved by technology

[0006] For the surrounding rock control of the dynamic pressure soft rock roadway, the existing support technology either cannot achieve the expected support effect, it is difficult to control the long-term deformation of the dynamic pressure soft rock roadway, the support resistance is insufficient, and the deformation of the roadway is large; If the investment is too high, it is difficult for the coal mine to bear the support cost, which is not conducive to the high production and high efficiency of the coal mine

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