Method for improving stability of roadway surrounding rock

Abstract

The invention relates to a method for improving the stability of a roadway surrounding rock, which belongs to the technical field of underground engineering surrounding rack stability under the high-stress condition and is characterized in that the method belongs to a method for forming a bearing pad layer belt and changing the stress distribution of the roadway surrounding rock through pressing and filling bearing pad layer materials into a deep part rock body of the roadway surrounding rock so that the deep part rock body of the roadway surrounding rock has an active support effect, and thestress of the surrounding rock in the superficial position on the periphery of a roadway is reduced, and the method aims at improving the stability of the roadway surrounding rock under the conditionof maintaining the completeness of the surrounding rock in the superficial position on the periphery of the roadway. Compared with the existing method for improving the stability of the high-stress roadway surrounding rock, the method has the substantial characteristics and obvious effects that the implementation is easy, the effect for controlling the stability of the surrounding rock is obvious, the cost is low, safety and reliability are realized, and the like.

Description

technical field [0001] The invention discloses a method for improving the stability of the roadway surrounding rock, which belongs to the technical category of the stability of the underground engineering surrounding rock under high stress conditions. The active supporting force of the deep rock mass of the surrounding rock improves the stress distribution state of the surrounding rock of the high-stress roadway. The purpose is to improve the stability of the high-stress roadway under the condition of maintaining the integrity of the surrounding rock surrounding the superficial part of the roadway. Background technique [0002] Under the condition of high stress (deep self-gravity stress field, residual structural stress field or support stress field caused by excavation), the stability control of underground engineering surrounding rock is a major technical problem, which has been regarded as a key and difficult point at home and abroad for decades. According to research, t...

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Problems solved by technology

[0002] Under the condition of high stress (deep self-gravity stress field, residual structural stress field or support stress field caused by excavation), the stability control of underground engineering surrounding rock is a major technical problem, which has been regarded as a key and difficult point at home and abroad for decades According to the research, the current existing methods for controlling the stability of roadway surrounding rock under high stress conditions can be classified into five categories: the first category is passive rigid support technology, such as masonry, reinforced concrete pouring, shotcrete and scaffolding, etc., but in Under high stress conditions, this type of support body will be fractured, collapsed, twisted, and folded; the second type is active reinforcement to improve the self-supporting capacity of surrounding rock, such as anchoring with anchor rods and cables and the surrounding rocks that have been broken in the shallow part. Grouting reinforcement in rocks, etc., but under high stress conditions, this kind of anchorage or reinforcement will have a large overall deformation, or even break the anchor and cable, resulting in damage and collapse of the surrounding rock of the roadway; the third type is pressure support technology, For example, shrinkable scaffolding is used, or deformation space is reserved behind scaffolding or masonry, large deformation cushions are placed, or large deformation anchor rods and cables are used, etc. At the expense of shifting the surrounding rock stress to the deep, but under high stress conditions, it is difficult for this kind of support body and roadway space to meet the requirements of yielding pressure on the deformation of surrounding rock; the fourth category is pressure relief technology, such as in the roadway Drilling, cutting, excavating pressure relief grooves, softening by water injection or weakening by loosening and blasting are carried out in the surrounding rock to achieve the purpose of releasing high stress in the surrounding rock in the shallow part. However, under high stress conditions, this method will not only damage the The integrity of the surrounding rock in the superficial part of the roadway is compromised, and it cannot meet the requirements of large deformation of the roadway under high stress conditions.

The fifth category is the far-field pressure relief of the roadway, such as pre-mining the release layer above or around the design position of the roadway, or pre-excavating the pressure relief roadway to achieve the purpose of reducing the stress of the surrounding rock of the roadway, but this method requires pre-excavation. Layer conditions, such as special pre-excavation pressure relief roadway, will increase the amount of roadway excavation

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