CN105627849A - Fast blasting demolition method for underground coal mine fire dam - Google Patents

Abstract

The invention discloses a fast blasting demolition method for an underground coal mine fire dam, and relates to the technical field of underground coal mine fire dam demolition. The method is used for solving the problems that in the prior art, the demolition cost of the underground coal mine fire dam is high, efficiency is low, and safety is not high. The method comprises the steps that the fire dam to be demolished is subjected to blast hole cutting, and the angle of a blast hole ranges from 45 degrees to 60 degrees; water is injected into the blast hole; a pressure trigger device is fixed in the blast hole, and an explosive is placed in the pressure trigger device; a guard railing is arranged on the blasting face of the fire dam to be demolished according to the blasting safety distance; and the explosive in the pressure trigger device is detonated outside the blasting safety distance, and blasting demolition is achieved.

Description

A kind of airtight wall quick bursting method for dismounting of underground coal mine

Technical field

The present invention relates to underground coal mine airtight wall demolition technique field, relate to a kind of airtight wall quick bursting method for dismounting of underground coal mine more specifically.

Background technology

China is coal production big country, wherein central and west regions 64% mine is gassy mine, and the development along with coal mining technology, mine heat power disaster phenomenon occurs very frequent, once the accident such as the inner coal spontaneous ignition in coal seam or gas leakage, for avoiding loss of life and personal injury and equipment property damage, being badly in need of adopts an effective measure to working face and coal seam carries out shutoff, but after the condition of a disaster is effectively controlled, first need to remove airtight.

Current mine airtight wall method for dismounting mainly contains manual demolition method, quiet power voiceless demolition and expansion dismounting method, but to abolish the time long for manual demolition method, and efficiency is low, and labour intensity is big; Although quiet power voiceless demolition and the operation of expansion dismounting method are comparatively safe, but abolishing that efficiency is lower, to abolish the time long, cost is higher. The impacts such as mine airtight wall surrounding environment is complicated, construction period nervous, recovery pressure is big, circumstance complication is changeable, airtight section roof and floor and both sides roadway surrounding rock easily break, therefore, existing demolition technique can not meet the airtight wall of efficient mine and remove demand.

In sum, in prior art, there is the airtight wall of underground coal mine, to remove cost height, efficiency low, and the problem that security is not high.

Summary of the invention

The embodiment of the present invention provides a kind of airtight wall quick bursting method for dismounting of underground coal mine, there is the airtight wall of underground coal mine in order to solve to remove cost height, efficiency low in prior art, and the problem that security is not high.

The embodiment of the present invention provides a kind of airtight wall quick bursting method for dismounting of underground coal mine, comprising:

Treating and tear airtight wall open and carry out blast hole cutting, described blast hole angle is between 45 �㡫60 ��;

Water filling in described blast hole;

Pressure triggering is fixed in described blast hole, in described pressure triggering, it is placed with explosive;

According to safety distance for blasting, meet quick-fried protective grating is set waiting to tear open airtight wall;

Outside described safety distance for blasting, ignite explosive in described pressure triggering, it is achieved demolition blasting.

The degree of depth of described blast hole, determine by following formula:

$l\≥\frac{1}{\sin \mathrm{\α}}(H+h_1)$

Wherein, l is the degree of depth of blast hole, and �� is blast hole angle; H tears airtight wall height open for waiting; h₁For bottom outdrill.

Described safety distance for blasting is down-hole hydraulic pressure bulk blasting stone fling distance, determines by following formula:

$V_1\sqrt{\frac{2h}{g}}\≤S\≤\frac{{V_1}^2}{g}$

Wherein, S is safety distance for blasting, V₁For flying stone speed; H is that fragment disperses drop; G is universal gravity constant.

Described fly stone speed, determine by following formula:

$V_1={\[\frac{(K_1-K_2)\mathrm{\μ}}{2{\mathrm{\π\ρR}}^2{\mathrm{\δ}}_1}\]}^{1/2}$

Wherein, K₁��K₂It is respectively the 1st, the 2nd underwater shock wave Energy harvesting coefficient, and K₁=0.31, K₂=0.17; �� is blast merit, and ��=4 �� 10⁵; �� tears airtight wall density open for waiting; R is that Bao Yuan center is to waiting the distance tearing airtight wall open; ��₁For waiting to tear airtight wall equivalence wall thickness open.

In the embodiment of the present invention, directly to water filling in blast hole with angle, simple to operate, cost-saving, efficiency height; Meet quick-fried protective grating is set waiting to tear open airtight wall, ensure that personnel equipment's safety in airtight wall demolishing process, reduce difficulty of construction.

Accompanying drawing explanation

In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, embodiment and accompanying drawing will be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.

A kind of underground coal mine airtight wall quick bursting method for dismounting schematic flow sheet that Fig. 1 provides for the embodiment of the present invention;

The blast hole layout drawing that Fig. 2 provides for the embodiment of the present invention;

The pressure triggering schematic diagram that Fig. 3 provides for the embodiment of the present invention.

Description of reference numerals:

1-impacts wave duct, room, 2-medicine chamber, and 3-ignites mechanism, and 4-ignites stay cord.

Embodiment

The embodiment of the present invention provides a kind of airtight wall quick bursting method for dismounting of underground coal mine, comprising: treating and tear airtight wall open and carry out blast hole cutting, described blast hole angle is between 45 �㡫60 ��; Water filling in described blast hole; Pressure triggering is fixed in described blast hole, in described pressure triggering, it is placed with explosive; According to safety distance for blasting, meet quick-fried protective grating is set waiting to tear open airtight wall; Outside described safety distance for blasting, ignite explosive in described pressure triggering, it is achieved demolition blasting.

A kind of underground coal mine airtight wall quick bursting method for dismounting schematic flow sheet that Fig. 1 provides for the embodiment of the present invention; Comprise the following steps:

Step S101, treats and tears airtight wall open and carry out blast hole cutting, and described blast hole angle is between 45 �㡫60 ��;

The described blast hole degree of depth, determine by following formula:

$l\≥\frac{1}{\sin \mathrm{\α}}(H+h_1)$

Wherein, l is the degree of depth of blast hole, and �� is blast hole angle; H tears airtight wall height open for waiting; h₁For bottom outdrill.

Described blast hole array pitch is as shown in Figure 2;

As shown in Figure 2, wait the blast hole torn open on airtight wall, cut two explosive holes to centre erecting of body of wall, in the laterally middle cutting one explosive hole of body of wall.

Step S102, water filling in described blast hole.

Step S103, is fixed on pressure triggering in described blast hole, is placed with explosive in described pressure triggering;

Preferably, as shown in Figure 3, described pressure triggering, comprises and impacts wave duct 1, room, medicine chamber 2, ignition mechanism 3 and ignite stay cord 4; Described pressure triggering is fixed in the blast hole waiting to tear airtight wall open, described impact wave duct 1 one end is stretched in described blast hole, being provided with room, medicine chamber 1 in described impact wave duct 1, described impact wave duct 1 the other end connects described ignition mechanism 3, and described ignition mechanism 3 is connected with described ignition stay cord 4.

Step S104, according to safety distance for blasting, meets quick-fried and arranges protective grating waiting to tear open airtight wall;

Described safety distance for blasting is down-hole hydraulic pressure bulk blasting stone fling distance, determines by following formula:

$V_1\sqrt{\frac{2h}{g}}\≤S\≤\frac{{V_1}^2}{g}$

Wherein, S is safety distance for blasting, V₁For flying stone speed; H is that fragment disperses drop; G is universal gravity constant.

Described fly stone speed, determine by following formula:

$V_1={\[\frac{(K_1-K_2)\mathrm{\μ}}{2{\mathrm{\π\ρR}}^2{\mathrm{\δ}}_1}\]}^{1/2}$

Wherein, K₁��K₂It is respectively the 1st, the 2nd underwater shock wave Energy harvesting coefficient, and K₁=0.31, K₂=0.17; �� is blast merit, and ��=4 �� 10⁵; �� tears airtight wall density open for waiting; R is that Bao Yuan center is to waiting the distance tearing airtight wall open; ��₁For waiting to tear airtight wall equivalence wall thickness open.

Step S105, outside described safety distance for blasting, ignites explosive in described pressure triggering, it is achieved demolition blasting;

It should be noted that, outside safety distance for blasting, pull the ignition stay cord 4 on pressure triggering, ignite the explosive in pressure triggering, impact after wave duct 1 is hit and produce very big pressure wave, pressure wave makes device for storing liquid broken, and is propagated by the water in blast hole in the way of static hydraulic pressure, thus utilizes water to propagate shockwave fragmentation and wait to tear airtight wall open.

In the embodiment of the present invention, directly to water filling in blast hole with angle, simple to operate, cost-saving, efficiency height; Meet quick-fried protective grating is set waiting to tear open airtight wall, ensure that personnel equipment's safety in airtight wall demolishing process, reduce difficulty of construction.

Although having described the preferred embodiments of the present invention, but those skilled in the art once the substantially creative concept of cicada, then these embodiments can be made other change and amendment. Therefore, it is intended that the appended claims shall be construed comprise preferred embodiment and fall into all changes and the amendment of the scope of the invention.

Obviously, the present invention can be carried out various change and modification and not depart from the spirit and scope of the present invention by the technician of this area. Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these change and modification.

Claims (4)

1. the airtight wall quick bursting method for dismounting of underground coal mine, it is characterised in that, comprising:

Treating and tear airtight wall open and carry out blast hole cutting, described blast hole angle is between 45 �㡫60 ��;

Water filling in described blast hole;

Pressure triggering is fixed in described blast hole, in described pressure triggering, it is placed with explosive;

According to safety distance for blasting, meet quick-fried protective grating is set waiting to tear open airtight wall;

Outside described safety distance for blasting, ignite explosive in described pressure triggering, it is achieved demolition blasting.

2. the method for claim 1, it is characterised in that, the degree of depth of described blast hole, determine by following formula:

$l\≥\frac{1}{\sin \mathrm{\α}}(H+h_1)$

Wherein, l is the degree of depth of blast hole, and �� is blast hole angle; H tears airtight wall height open for waiting; h₁For bottom outdrill.

3. the method for claim 1, it is characterised in that, described safety distance for blasting is down-hole hydraulic pressure bulk blasting stone fling distance, determines by following formula:

$V_1\sqrt{\frac{2h}{g}}\≤S\≤\frac{V_1^2}{g}$

Wherein, S is safety distance for blasting, V₁For flying stone speed; H is that fragment disperses drop; G is universal gravity constant.

4. method as claimed in claim 3, it is characterised in that, described in fly stone speed, determine by following formula:

$V_1={\[\frac{(K_1-K_2)\mathrm{\μ}}{2{\mathrm{\π\ρR}}^2{\mathrm{\δ}}_1}\]}^{1/2}$

Wherein, K₁��K₂It is respectively the 1st, the 2nd underwater shock wave Energy harvesting coefficient, and K₁=0.31, K₂=0.17; �� is blast merit, and ��=4 �� 10⁵; �� tears airtight wall density open for waiting; R is that Bao Yuan center is to waiting the distance tearing airtight wall open; ��₁For waiting to tear airtight wall equivalence wall thickness open.