SU1642008A1 - Method of safeguarding mine working in stratified medium - Google Patents

Abstract

The invention relates to the protection of workings maintained at the border with the developed space during mining of coal seams. The goal is to increase the reliability of production by eliminating the collapse of the cut-off roof console on the lining and reducing the cost of blasting by reducing the amount of drilling and explosives. of the developmental workings in the roof rocks of the drill of the fan of wells, the number of which in the fan is equal to the number of roof layers to be cut off The first well from the reservoir of the fan passes through the drill of the first layer of roofing rocks and the formation of a grinding zone of rock with its maximum radius at the point of intersection of the zone with the upper bedding layer of the first layer of rock. Subsequent bore holes of the fan are drilled through the point of intersection of the crushing zone of rocks from the previous well with the upper bedding layer of the underlying layer of rocks. according to the formula given, starting from the side of the reservoir in each subsequent well, the beginning of the charge is shifted deep into the array to the top flat ti penultimate strata underlying layer sawmills The charges in wells blown to form zones grinding rock which collapse occurs severed console roof rock the mined-out space lava yl 2 E

Description

The invention relates to mining and can be used in the protection of preparatory workings supported on the border with the developed space when mining coal seams.

The purpose of the invention is to improve the reliability of production by eliminating the collapse of the cut-off roof console on the lining of production and reducing the cost of drilling and blasting operations as a result of reducing the volume of drilling operations and reducing the consumption of explosives.

Fig 1 shows the development system with the protection of the preparatory development on the border with the goaf,

Fig. 2 shows the location of wells and charges, section A-A in Fig. 1.

The method is carried out as follows.

Preparatory production 1 is supported behind the clearing hole 2. The immediate roof of the reservoir is represented by layers 3,4 and 5 with bedding planes 6.7 between them. To cut off the hanging console in front of the clearing hole from the preparatory development of the drill fan 8 in the rock of the immediate roof. each fan is assumed to be equal to the number of cut layers of roof rocks. Depending on the physicomechanical

TO

YU

oh oh

00

the rock properties of each layer, the type and mass of the explosive and the borehole diameter, using known methods determine the radius of the grinding zone around the well for each layer.

The wells are drilled at an angle. The angle between adjacent wells is determined from the ratio

mi / sin (oi -1 –m + oi) n / sin a, -, + -i,

where 2 mi is the total power n of the compartment 1

myh layers;

сь - i + 1 angle between the i-th and (1 + 1) -th wells;

 the angle of inclination of the 1st well to the reservoir;

P is the maximum radius of the zone of rock measurement in the i-th layer using the method of enumeration of variants taking into account the thickness of layers 3 and 4. The first well from the formation is drilled at an angle of 45 ° to the formation with penetration of the first layer of roof rocks. The charge of the first well is placed at the intersection with the first layer 3. The beginning of the charge of the second well is shifted to the upper boundary of the bedding plane 6 of the first cut-off layer 3 from the formation. The beginning of the charge of the third well is shifted to the upper boundary of the bedding plane 7 of the second layer of the cut-off layer 4 Then, the blasting of charges of wells is started, starting from the first from the reservoir, in a short time (for example, after 10 ms). At the same time, around the wells, grinding zones 9 are formed by explosion.

The first well is designed to cut off the first layer from the formation. In this case, the layer is re-routed so that the radius of the grinding zone 9 at the point of its intersection with the upper bedding layer 6 of this layer is maximum (segment AB in Fig. 2). In order to intersect the rock grinding zones in the bedding plane 6, the second well is positioned so that it passes through the point of intersection of the rock breakage zone from the previous well with the bedding plane b (point C). When locating wells, it is necessary to take into account that the boundaries of the zones of the destroyed rocks are not above production. Otherwise, the angle of inclination of the first well to the reservoir is reduced

The blasting of boreholes is carried out shortly, starting from the bottom. At the same time, after the first well from the formation is detonated, the layer cut off by it is orbited into the developed area, separating along the fracture zone and the bedding plane. Then the second layer will fall, etc. The successive collapse of the layers of snow is less dynamic.

As a result of the layer-by-layer cutting off of the hanging roof console, the borehole of the fan cuts off the corresponding layer due to the displacement of the charge in it to the section of its intersection with this sequence. G.ri this with removal

The 0 layer from the formation increases its cut-off angle. Therefore, the cantilever collapse line, connecting the fracture zones around the wells, is outside the production area, and the cantilevered arm is maximum.

5 F o rumlula and z o bre tem

A method of protecting preparatory production in a layered environment, including drilling from a preparatory production into the roof rocks of the well fans, the number of which in the fan is equal to the number of roof layers being cut off, the wells being charged with WB charges, and the formation of grinding zones of rocks by blasting charges to explosives in the wells, t that

5 improving the security of production by eliminating the collapse of the cut-off roof console on the lining and reducing the cost of drilling and blasting operations as a result of reducing the volume of drilling operations and reducing the consumption of explosives, the first well of the fan from the formation passes through the first layer of roof rocks and the grinding zone is formed rocks with its maximum radius at the point of intersection of the zone

5 with the upper bedding layer of the first layer of rock, the subsequent bore holes of the fan are drilled through the intersection point of the grinding zone from the previous well with the upper bed layer of the underlying rock layer, and the angle between adjacent wells is taken from the ratio

P

% mi / sin (", -, + 1 +",) n / sin Oi - (, + D i 1

where 2 rrji is the total power n of the cut off

i 1

layers;

“I is the (i -M) angle between the i-th and 0 + 1) th wells;

From the angle of inclination of the i-th well to the reservoir;

P is the maximum radius of the grinding zone of the rocks by an explosion in the i-th layer, and starting from the reservoir side, in each subsequent well, the beginning of the charge is shifted into the depth of the array to the upper plane of the last but one bed below

rock layer

rl

and

ji .L j. . ... V .. .U ... .. .....

fig 2

/ /

r in

one

FIG L

four

Claims (1)

15 claims A method of protecting preparatory workings in a layered environment, including drilling from the preparatory workings into the roof rocks, the number of fans, the number of which is 20 in the fan, the number of clipped layers of the roof, charging the wells with explosive charges and the formation of crushing zones of "explosions of explosive charges" in the wells, the fact that, with the goal of 25 increasing the reliability of protection of the workings by eliminating the collapse of the cut-off roof console on the support of the workings and reducing the cost of drilling and blasting operations as a result of a decrease in the volume of drilling operations and to lower the explosive flow rate, the first fan hole from the formation passes through the first layer of roofing rocks and forms a grinding zone with its maximum radius at the intersection of zone 35 with the upper bedding plane of the first rock layer; subsequent fan wells are drilled through the intersection of the rock grinding zone from the previous wells with an upper bedding plane of 40 of the underlying rock layer, while the angle between adjacent wells is taken from the relation η X mi / sin (a, - v + v + «v) = Γ | / sin о, + ή, i = 1 η where X pi - total power η cut-off i = 1 5 layers; “Ί - (ι + ι) the angle between the ί-th and (! + 1) -th wells; Oi- the angle of inclination of the i-th well to the reservoir; p is the maximum radius of the zone of crushing of rocks by explosion in the i-th layer. and, starting from the side of the formation, in each subsequent well, the beginning of the charge is displaced deep into the massif to the upper bedding plane of the penultimate underlying layer of rocks. Figure 1 Compiled by V. Cherkasheninov Editor A. Dolinich Tehred M. Morgenthal Corrector N. King Order 1130 Circulation 307 Subscription VNIIIPI of the State Committee for Inventions and Discoveries under the State Committee for Science and Technology of the USSR 113035, Moscow, Zh-35, Raushskaya nab., 4/5 Production and Publishing Plant Patent, Uzhgorod, Gagarin St. 101