CN102748026B - Short-wall-box-type coal mining method - Google Patents

Abstract

The invention relates to a short-wall-box-type coal mining method. The method is characterized in that: (1) ahead of a working face, along a coal seam trend, a reparation cut eye with a height of 2.5m and a width of 2m is excavated in advance every 30m, wherein the reparation cut eyes are perpendicular to the two drifts; concrete is cast, and an inclined concrete wall is formed, wherein the concrete wall is cast by pumping; (2) with the advancing of the working face, a trend concrete wall with a width of 2m is constructed along the direction of the two drifts behind hinged roof beams of independent supports, wherein the concrete wall is cast by pumping; (3) when the working face reaches the reparation cut eyes, moving is carried out; and (5) with the advancing of the working face, the above processes are repeated, such that a goaf concrete wall is arranged in a box type.

Description

The box coal-mining method of a kind of shortwall

Technical field

The present invention is a kind of new strip coal pillar recovery method in Mineral Engineering field, and particularly relating to a kind of goaf is box shortwall method.

Background technology

For china natural resources relative shortage, the basic characteristics that environment is more fragile, set up the resources conservation of applicable China's national situation, eco-friendly green industrialized road are imperative.In recent years, some experts and scholars proposed " Green Mining Technology ", its essence is from the angle of generalized resources and was familiar with and treats all utilizable resources such as coal, gas, water, soil; Basic point of departure alleviates the harmful effect of coal mining to environment and other resources as far as possible from the angle of mining.Economic activity is effectively organized into the enclosed type energy cycle of matter of " utilization of resources-green industry-resource regeneration ", keep the low consumption of economical production, high-quality, low discarded, thus the impact of economic activity on natural resource is reduced to minimum level.

At present, due to the fast development of Chinese national economy, energy demand rolls up, and along with a large amount of exploitations of coal resources, it is more and more outstanding that village presses down coal problem, affects the sustainable development of many barghs.China only coal mine under the unified-allocation system mine main " three times " pressure coal just reach 137.9 hundred million t, wherein build down 94.68 hundred million t, account for 69% of stagnation pressure coal amount.Almost each mine has coal under villages problem, generally all accounts for 10 ~ 30% of reserves on mine, have up to 40%.

Research and development " three times " pressure coal scale production technique is colliery significant technology issues urgently to be resolved hurrily.And the box coal-mining method of shortwall of the present invention's design, the object controlling strata movement, protection surface buildings and reduce environmental disruption can be reached.

Summary of the invention

The object of this invention is to provide the method that strip coal pillar reclaims under the building of a kind of colliery.The method increase coal recovery rate, decrease the destroying infection of exploitation to surface buildings, extend mine life, improve mine economic benefit.

For achieving the above object, the technical solution used in the present invention is:

(1) first advance, along bearing, the benefit of tunneling highly 2.5m, width 2m in advance perpendicular to two gallerys every 30m cuts eye, and concreting, formability concrete wall, described concrete wall are that pumping is built, and in concrete wall, each quality of materials ratio of concrete is, portland cement: water: sand: rubble: early strength admixture: water reducing agent=1:0.35:1.7:2.4:0.021:0.013;

(2) with the advance of the face, build by laying bricks or stones along two gallery directions at support unit articulated roof beam rear 2m wide move towards concrete wall, move towards concrete wall also for pumping is built, each quality of materials of concrete quality of materials ratio more each than the concrete in same tendency concrete wall in concrete wall;

(3) when the advance of the face is moved to when mending and cut position;

(4) repeat with the above operation of the advance of the face, make goaf concrete wall form box layout.

Preferred concrete maximum particle diameter is less than 25mm.

The box coal-mining method tool of shortwall has the following advantages:

(1) present device less investment, recovery ratio are high, easy to operate, technique simple, mend to cut eye and can tunnel in advance and concreting, and this is conducive to realizing preparation and coal work parallel operations, thus improves production efficiency.

(2) the box concrete wall of the present invention enter goaf, do not stress at first, later along with the raising of box concrete wall intensity, possessed the ability absorbing stress and stress transfer, thus also form " member " on stratum, take part in stratum self-organizing system and activity.Box concrete wall have the effect of stress isolation, not only can level of isolation stress but also can isolate vertical stress.After box concrete wall enter stope, due to actings in conjunction such as box concrete wall, country rock, geostatic stress, excavations, particularly excavate the self-organizing function of system, surrouding rock deformation is controlled, country rock energy dissipation speed is slowed down, thus effectively can control the development of mine structure and surrounding rock failure, prevent unobstructedly freely to destroy slump.

(3) application of the present invention can realize the recovery completely of strip coal pillar, the rate of extraction 32% ~ 60% can be improved, prevent from exploiting the impact caused environment, realize exploitation consistent with environmental harmony, enable Coal Resource Development obtain best economic benefit and environmental benefit.

Accompanying drawing explanation

Accompanying drawing is the work plane schematic diagram implementing coal-mining method of the present invention.

In figure: 1-haulage way, 2-is inclined to concrete wall, and 3-moves towards concrete wall, 4-work plane, 5-support unit.

Detailed description of the invention

See accompanying drawing 1, which depict the work plane using the box coal-mining method of shortwall of the present invention.In method implementation process, first along bearing, the benefit of tunneling highly 2.5m, width 2m in advance perpendicular to two gallerys every 30m cuts eye, and concreting, formability (being parallel to work plane direction) concrete wall, then select High-grade Conventional Mining Technique normally to mine; Along with the advance of the face, at support unit articulated roof beam rear, build the wide trend of 2m (perpendicular to work plane direction) concrete wall by haulage way side in time along gallery direction, move towards concrete wall and be inclined to concrete wall to be interconnected, form case structure.When the advance of the face cuts a position to mending, move when being namely inclined to concrete wall position, namely working face equipment entirety moves to new coal mining position, crosses tendency concrete wall and restarts to mine.Repeat with the above operation of the advance of the face, goaf concrete wall are arranged in " box ".Above-mentioned each concrete wall are pumping and build, and the match ratio of pumping of concrete is determined by theory measurement and test.Each quality of materials ratio is, portland cement: water: sand: rubble: early strength admixture: water reducing agent=1:0.35:1.7:2.4:0.021:0.013, in concrete, maximum particle diameter is less than 25mm, is preferably less than 15mm, ensures that the concrete uniformity is to improve the intensity of concrete wall.

Operating principle of the present invention:

(1) surperficial support action.By applying kinematic constraint to the displacement of stope Key Blocks, box concrete wall can prevent under low-stress, excavate space periphery rock mass Progressive failure spatially.

(2) local support action.The quasi-continuity rigid body displacement of wall rock mass helped by the stope caused by contiguous mining activity, makes box concrete wall play the effect of passive antibody.The supporting pressure acted on box concrete wall and rock mass interface allows to produce very high local stress gradients at stope periphery.

(3) overall support action.If box concrete wall are subject to suitable constraint, it can play a kind of effect of overall support unit in the structure of mine.That is, induced displacement that rock mass and box concrete wall interface are dug up mine will cause the distortion of box concrete wall, and this kind of distortion result in the reduction of stress state in the near-field region of whole mine.

The box coal-mining method of shortwall can effectively control being caving of base object model; although produce flexural deformation under the load effect of key stratum overlying strata at an upper portion thereof; but because absciss layer space is little; key stratum and supporting body thereof directly act on the soft layer under it; along with the increase of deflection; the supporting role power that its underpart soft layer gives is strengthened, thus limits the bending deformation quantity of key stratum, reaches the object of protection surface buildings.

The above; be only patent of the present invention preferably detailed description of the invention; but the protection domain of patent of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope of patent diselosesll of the present invention; the change that can expect easily or replacement, within the protection domain that all should be encompassed in patent of the present invention.

Claims (2)

1. the box coal-mining method of shortwall, is characterized in that its activities is as follows:

(1) first advance, along bearing, the benefit of tunneling highly 2.5m, width 2m in advance perpendicular to two gallerys every 30m cuts eye, and concreting, formability concrete wall, described tendency concrete wall are that pumping is built, and each quality of materials ratio of concrete is, portland cement: water: sand: rubble: early strength admixture: water reducing agent=1:0.35:1.7:2.4:0.021:0.013;

(2) with the advance of the face, at support unit back timber rear, by haulage way side to build by laying bricks or stones along two gallery directions 2m wide move towards concrete wall, describedly move towards concrete wall also for pumping is built, each quality of materials of its concrete is than with each quality of materials ratio of the concrete in described tendency concrete wall; The described concrete wall that move towards are interconnected with tendency concrete wall;

(3) when the advance of the face is moved to when mending and cut position;

(4) repeat with the above operation of the advance of the face, make goaf concrete wall form box layout.

2. the box coal-mining method of shortwall according to claim 1, concrete maximum particle diameter is less than 25mm.