Point source type spaced grouting damage reducing method by roof caving crack expansion filling and directional drilling

A technology of directional drilling and grouting, which is applied in the fields of backfill, earth-moving drilling, safety devices, etc., can solve the problems of unsuitable large-scale promotion and implementation of coal mining enterprises, affecting the production layout of efficient coal mining, and reducing the service life of mines, etc. Achieve the effect of reducing coal transportation efficiency, controlling uneven settlement of overlying rock, and reducing aggregate transportation costs

Active Publication Date: 2020-06-26
XIAN UNIV OF SCI & TECH
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Problems solved by technology

However, the mining method of retaining coal pillars causes waste of resources and reduces the service life of the mine on the one hand; on the other hand, it affects the production layout and eff

Method used

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  • Point source type spaced grouting damage reducing method by roof caving crack expansion filling and directional drilling
  • Point source type spaced grouting damage reducing method by roof caving crack expansion filling and directional drilling
  • Point source type spaced grouting damage reducing method by roof caving crack expansion filling and directional drilling

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Embodiment 1

[0034] refer to Figure 1~4 , aiming at the situation that the broken body completely fills (including nearly completely filled) the goaf after the natural collapse of the roof, a method of using the roof collapse to fill and directional drilling point source interval grouting to reduce damage, specifically includes the following steps:

[0035] The first step, due to the complexity of on-site coal mine geological mining, it is necessary to determine the overall height of the caving zone through the empirical relationship between the mining height and the caving zone and the mining geological data of the actual coal mine, and determine the stacking height through the limit caving step of the roof. Pile spacing L, while taking into account a certain safety reserve factor (it is recommended to refer to the relevant specification to take a value of 1.25); the stacking pile spacing L is the calculated value after multiplying the limit span by the safety factor.

[0036] The second...

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Abstract

The invention discloses a point source type spaced grouting damage reducing method by roof caving crack expansion filling and directional drilling. The method comprises the following steps of: after coal mining operation is carried out, a roof naturally caves to form a state of full filling or near-complete filling; firstly, spaced underground directional drilling is adopted to the upper part of acaving broken body, and a PVC (polyvinyl chloride) casing pipe and a grouting pipe are synchronously laid to realize fixed-point grouting, wherein the performance of a grouting material is selected by referring to a relevant national standard and is subjected to targeted mix proportion design, and a proper accelerator is selected to accurately control the initial setting time of grout; and then,a grouting flow meter and a grouting pressure meter are laid on a grouting pipeline to realize the accurate and real-time monitoring of a grouting quantity, and meanwhile, a spiral spray nozzle is selected to carry out surface-shaped injection grouting. Through grouting pipeline pressure control and flow monitoring, the grouting quantity and a grouting speed are determined, and finally, a point source type spaced grouting stack pile body layout scheme is formed.

Description

technical field [0001] The invention relates to the technical field of coal mine mining, in particular to a method for reducing damage by using roof collapse and swell filling and directional drilling point-source interval grouting. Background technique [0002] The status of coal as the core energy source in my country will not change in the short term, but with the increase of coal production in my country year by year, many mining damage problems have been brought about, which have a significant impact on the surface ecology and groundwater environment. Especially for the ecologically fragile area of ​​the Ordos Basin, where there is drought and little rain, water resources are scarce, and the ecological environment is fragile. The contradiction between large-scale mining of coal resources and ecological environment protection is very prominent. A large number of previous coal mining practices have shown that coal mining will change the distribution of the underground str...

Claims

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Application Information

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IPC IPC(8): E21F15/00E21F15/08
CPCE21F15/00E21F15/08
Inventor 王双明石智军申艳军王生全郝建帅白志鹏侯新
Owner XIAN UNIV OF SCI & TECH
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