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Ground pre-grouting strengthening technology for deep long-distance roadway surrounding rock

A long-distance, pre-grouting technology, applied in tunnels, tunnel linings, underground chambers, etc., can solve the problems of poor working environment at the construction site, inability to use large-scale equipment, and limited grout diffusion distance, etc., to achieve good reinforcement effect and solidification Time is controllable and the effect of improving the construction environment of workers

Active Publication Date: 2014-06-04
BEIJING CHINA COAL MINE ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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; ③Reinforcement grout is mainly chemical grout, which is costly and is not conducive to environmental protection
④The working environment at the construction site is poor and there are many unsafe hidden dangers

Method used

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  • Ground pre-grouting strengthening technology for deep long-distance roadway surrounding rock
  • Ground pre-grouting strengthening technology for deep long-distance roadway surrounding rock
  • Ground pre-grouting strengthening technology for deep long-distance roadway surrounding rock

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Embodiment Construction

[0028] In this embodiment, the ground pre-grouting reinforcement process of the surrounding rock of the deep and long-distance roadway includes the following steps:

[0029] (a) Use a drilling rig to open ground grouting drilling holes on the ground. The ground grouting drilling includes a casing section, a deflection section and a horizontal reinforcement section. The surface entrance of the open hole and ground grouting drilling is arranged along the direction of the roadway; the depth of the bottom opening of the casing section entering the stable bedrock is greater than or equal to 10m, the specification of the casing is Φ168*8mm seamless geological pipe, and the drilling of the casing section of the straight hole The hole deviation rate is less than or equal to 3‰, and the distance between the ground entrances of two adjacent ground grouting drilling holes is 200 meters; the curvature of the drilling trajectory in the deflection section is 5° / 30m; the apex angle of the dri...

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Abstract

The invention discloses a ground pre-grouting construction technology suitable for strengthening deep long-distance roadway surrounding rock, and particularly relates to a ground pre-grouting strengthening technology for deep long-distance roadway surrounding rock. The ground pre-grouting strengthening technology for the deep long-distance roadway surrounding rock includes the following steps that firstly, a ground grouting drill hole is formed in the ground through a drilling machine, the ground grouting drill hole comprises a casing pipe segment, a deflecting segment and a horizontal strengthening segment, a casing pipe segment drill hole is internally provided with a casing pipe, the deflecting segment and the horizontal strengthening segment are provided with rock open holes, and ground inlets of the ground grouting drill hole are formed in the walking direction of a roadway; secondly, grout is injected into a stratum rock body where the horizontal strengthening segment exists through a grouting pump located on the ground, and beforehand strengthening government of the roadway surrounding rock is achieved. According to the ground pre-grouting construction technology for strengthening the deep long-distance roadway surrounding rock, strengthening and grouting of the whole roadway surrounding rock can be achieved, and the ground pre-grouting construction technology is suitable for active strengthening of the coal mine large-range roadway surrounding rock and is high in safety and adaptability.

Description

technical field [0001] The invention relates to the field of roadway surrounding rock reinforcement in coal mine construction, in particular to a roadway surrounding rock reinforcement construction technology suitable for formations with long roadway distance, deep burial and poor surrounding rock stability. Background technique [0002] With the depletion of shallow coal resources, the mining of deep coal resources is becoming more and more common. However, the deep coal-measure strata are greatly affected by unpredictable factors such as complex geological conditions and high ground pressure. During the excavation process of underground roadways, they face construction risks such as sidewalls, falling blocks, and development of fissure water-conducting channels. Moreover, After the roadway is completed, damages such as excessive ground deformation of the surrounding rock, failure of support methods, and late water gushing will also occur. Therefore, the research on reinfo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/10
Inventor 刘书杰冯旭海安许良高岗荣高晓耕袁东锋孙光贺文陈振国史卫河周卫金王从平胡华军
Owner BEIJING CHINA COAL MINE ENG CO LTD
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