Pre-grouting reinforcement technology for ground construction of structural fracture zone of mining working face

Abstract

The invention discloses a pre-grouting reinforcement technology for the ground construction of a structural fracture zone of a mining working face. The pre-grouting reinforcement technology comprisesthe following steps of: step (1). performing foundation construction at a drill site; step (2). drilling a straight hole section, and lowering and fixing a first-level casing pipe; step (3). drillinga main branch hole bedding section and grouting, and completing the construction of a main branch hole building angle section and the main branch hole bedding section; and step (4). repeating the step(3) and the step (4), and completing the construction of secondary branch holes one by one. Before the construction of the underground fully mechanized coal mining face, a drilling machine is used onthe ground for drilling, and drills a horizontal grouting hole by using a directional technology; a ground surface grouting pump is used for injecting grout into a stratum rock mass where a fracturedroof of the fully mechanized coal mining face is located, so that the advance reinforcing treatment of the rock mass in the fracture zone of the roof is realized, the construction environment duringthe open-off cut and the working face mining is improved, and the construction progress of the roadway is accelerated. The pre-grouting reinforcement technology has high safety, improves the construction environment of workers, has less pollution to the environment, and is an initiative roof reinforcement technology.

Description

technical field [0001] The invention relates to the technical field of treating broken zones in coal mines and other mines. Specifically, it is a pre-grouting reinforcement process for ground construction in the structurally broken zone of the mining face. Background technique [0002] During the mining process of the fully mechanized mining face, the geological structure is an important factor affecting its safety and efficiency. Especially when a fault is encountered, the roof is broken, the coal seam mining line is difficult to control, and accidents such as slabs and roof fall are prone to occur. Large deformation of the rock, failure of support methods and other damages have a great impact on safe production. When the fully mechanized mining face encounters a fault with a large drop under the condition of a large dip angle, in order to ensure construction safety, it is often necessary to re-cut the hole or Partial eye patching, moving the working face across the struct...

AI Technical Summary

Problems solved by technology

Disadvantages: ①During grouting construction, the excavation process of the working face is completely stopped. If the cracks are very developed, it is necessary to construct a grout stop pad or a grout stop wall, resulting in a very low roadway excavation efficiency; ②The depth of the grouting drilling is shallow, and the reinforcement range It is very small, and at the same time, the space of the working face is limited, and large-scale equipment cannot be used. The grouting pressure is small, and the grout diffusion distance is limited;

④The working environment at the construction site is poor and there are many unsafe hidden dangers

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