A method for strengthening the bottom plate of working face by grouting at the top of Austrian ash

A technology of grouting reinforcement and working face, which is applied in earthwork drilling, wellbore lining, tunnel lining, etc. It can solve the problems that cannot satisfy the safety production in the deep part of the mining area, and achieve the effect of increasing production and extending service life

Inactive Publication Date: 2016-01-13
SHANDONG UNIV OF SCI & TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the guiding ideology of water prevention and control of "five ash is based on treatment, and Austrian ash is mainly on prevention" can no longer meet the needs of safe production in deep mining areas, and the Austrian ash must be actively treated

Method used

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  • A method for strengthening the bottom plate of working face by grouting at the top of Austrian ash
  • A method for strengthening the bottom plate of working face by grouting at the top of Austrian ash
  • A method for strengthening the bottom plate of working face by grouting at the top of Austrian ash

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Embodiment

[0027] In this embodiment, the working face is transformed by grouting at the top of Austrian ash in a certain mining area, and the specific process is as follows:

[0028] (1) Feasibility analysis of grouting at the top of Austrian ash: the Austrian ash aquifer is not an aquifer as traditionally considered, but a multi-layered aquifer with the characteristics of strata control, structure control, and rhythm. The aquifer sections are relatively independent and interrelated. The top of the Ordovician limestone mainly refers to the upper part of the Fengfeng Formation of the Middle Ordovician limestone, and the thickness of the upper part of the Fengfeng Formation is 154.68m. There are three layers, such as figure 1 Shown:

[0029] The upper part (0-20m) of the Austrian ash top is a relatively weak water-bearing layer section, and the range of 0-10m is a relatively water-resistant layer section, forming the "capping layer" required for the grouting reconstruction of the Austria...

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Abstract

The invention belongs to the technical field of mine Ordovician limestone aquifer grouting transformation, and relates to a method for reinforcing a working surface bottom plate by Ordovician limestone top grouting. According to the method, on the basis of analyzing the feasibility of the Ordovician limestone top grouting, a working surface, threatened by Ordovician limestone water, of lower group coal is analyzed, and a region of the working surface bottom plate transformed by the Ordovician limestone top grouting is determined; by starting from a water bursting coefficient, the Ordovician limestone top grouting depth is determined; the Ordovician limestone top grouting condition of the lower group seam is analyzed; concrete requirements are made for the grouting transformation work of each coal seam; then, a design of a grouting inclined hole three-stage sleeve and a principle of uniformly forming drill holes on the working surface are adopted, and the effectiveness and the pertinence of the Ordovician limestone aquifer grouting are ensured; finally, various methods are adopted for evaluating the grouting effect in a combined way; a region threatened by the Ordovician limestone water can be divided in time; the Ordovician limestone grouting thickness can be determined in time; the working surface bottom plate is reinforced through grouting; the safe mining of the working surface threatened by the Ordovician limestone water is ensured; the output of a resource-exhausted mine is improved; and the service life of the mine is prolonged.

Description

Technical field: [0001] The invention belongs to the technical field of grouting transformation of Austrian ash aquifers in mines, and relates to a technique for transforming the floor of a working face by grouting at the top of the Austrian ash, in particular to a method for reinforcing the bottom plate of the working face by grouting at the top of the Austrian ash. Background technique: [0002] With the increase of mining depth in North China coalfields in recent years, the mine pressure and the water pressure of the Austrian ash aquifer have also increased significantly. The hazards of ash water inrush cannot be guaranteed simply by prevention, and the research on active ash control technology must be carried out in order to ensure the safe mining of coal reserves threatened by ash water in deep mines. [0003] The control of karst water in the coal mine floor has mainly gone through the following development process: (1) large-scale industrial water release test technol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D11/10
CPCE21D11/105
Inventor 施龙青高卫富韩进王丹丹
Owner SHANDONG UNIV OF SCI & TECH
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