CN102011611A - Strip-type filling method of high water-swelling material for controlling movement and deformation of overlying strata - Google Patents

Strip-type filling method of high water-swelling material for controlling movement and deformation of overlying strata Download PDF

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Publication number
CN102011611A
CN102011611A CN 201010565597 CN201010565597A CN102011611A CN 102011611 A CN102011611 A CN 102011611A CN 201010565597 CN201010565597 CN 201010565597 CN 201010565597 A CN201010565597 A CN 201010565597A CN 102011611 A CN102011611 A CN 102011611A
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China
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filling
coal
deformation
band
water
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CN 201010565597
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Chinese (zh)
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石建新
王苇
刘树江
李志佩
王向宏
韩吉玉
路连营
王龙珍
王德良
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淄博市王庄煤矿
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Priority to CN 201010565597 priority Critical patent/CN102011611A/en
Publication of CN102011611A publication Critical patent/CN102011611A/en

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Abstract

The invention belongs to the fields of coal mining and filling, and particularly relates to a strip-type filling method of a high water-swelling material for controlling movement and deformation of overlying strata. The filling method is applicable to a coal mining face of a coal bed with the thickness of less than 3m. The method comprises the following steps: determining the limit span L and the safety span M of key strata according to a key strata theory for strata control, then determining the width N of a filling strip through calculation according to the support strength of a filling material, and filling the filling strip with the high water-swelling material. In the invention, by controlling the key strata, the most economical filling ratio can be determined and the maximum benefit can be realized; when no-coal pillar extraction is realized, movement and deformation of the overlying strata are fully controlled within the allowable range, thus realizing gentle and uniform surface subsidence in small quantity; by means of the high water-swelling material, high-recovery mining of coal resources under any condition is realized, and the safety degree of the coal mining face is greatly improved; and normal excavation engineering layout is not affected during the filling process, thus reducing influence on production and achieving high production efficiency.

Description

The high-water expansion material strips belt placement method of control overlying rock movement and deformation
Technical field
The present invention relates to a kind of high-water expansion material strips belt placement method of controlling the overlying rock movement and deformation, be applicable to the coal-face of thickness, belong to coal mining filling field in coal seam below 3 meters.
Background technology
Along with the continuous increase of coal in China mining rate, the land subsidence that causes because of exploitation becomes increasingly conspicuous to the influence of environment; And along with the exploitation time prolongation, superficial part (more than 600 meters) recoverable reserves is fewer and feweri, the cost of production and the safety cost of deep mining are more and more higher.How effectively solving ambient influnence and effective superficial part resource of pressing coal still can't exploit at present because of " three times " of utilizing of subsiding and causing because of coal mining, is the important topic that current coal industry faces.
Prevent to exploit the surface settlement that causes, subside; protection above ground structure and attachment; known exploitation method has three kinds: first room and pillar mining; it is to be exploited into the pillars of a house shape of comparison rule by the exploitation coal body; by staying the mineral building studding established, section isolated coal pillar etc. to support overburden weight; and reach control roof strata destruction and collapse, reduce to adopt purpose to the influence of ground building.The coal recovery rate of room and pillar mining is lower than 40%, and supporting means shortcoming, and roof fall accident easily takes place, and it is few that China uses at present.It two is filling minings, and it is that the development and the expansion that stop the roof strata inbreak to destroy finally reach and slows down subsidence with material bashings such as spoil, loess, river sands, the purpose of protection ground building.As patent publication No. is CN1936271A " method of filling coal-steam-free extraction working surface goaf by coal mine waste rock ", disclose a kind of with coal mine waste rock by the way of filling-up mechanicallys such as transporter and belt to the goaf.These class methods are subjected to the limitation of material, equipment, technology, charges can't be closely knit be full of the goaf, and this method all can't be in operation under the supporting condition safely and effectively, so preventing to still have bigger limitation on the subsidence the equipment of goaf operation and personnel.It three is band exploitation and attached mode with waste filling, and it is the ribbon that the coal seam that will be exploited is divided into rule, adopts one; stay one; by reducing to exploit the absolute productive area in coal seam in the piece section, reduce the face of land and move and be out of shape the purpose of protection ground building and reach.As patent publication No. is that " cave filling coal-mining method ", the patent publication No. of CN1483921A is " utilizing spoil displacement village to press down the exploitation method of coal " of CN1952349A, " exploitation method of replacement of banded coal under building by waste rock " that patent publication No. is CN1963149A etc., and the method for announcement just belongs to this type of.The coal recovery rate of these class methods is low, and less than 50%, though attached way with gangue refill has certain effect to slowing down surface settlement, extremely low and cost of winning increases aspects such as a lot, poor stability and considers to have lost more than gain with regard to some from resource recovery.Be in " building or structure press down the whole exploitation methods of coal big band cooperative type " of CN1410655A also just like patent publication No., what announce is that a kind of the jumping earlier adopted, again jumping is adopted the coal seam section that is stayed and carry out quick method of adopting by force simultaneously, it also is a kind of of band exploitation, though the rate of extraction of this method has had large increase, but the inhomogeneities of subsidence is still bigger, and the crucial later stage adopt by force the surface movement and deformation of stage under different regions and coal seam conditions be difficult to guaranteed, therefore, can the influence factor of effect of settling that reach expection bigger, has greater risk.
In sum, at present the home and abroad does not still have behind a kind of seam mining effectively control overlying rock movement and deformation, prevents ground settlement, avoids influencing the Roof Control method of environment.
Summary of the invention
According to above deficiency of the prior art, the technical problem to be solved in the present invention is: provide a kind of can utilize the overlying rock lithology, by the method for high-water expansion material strips belt part filling effectively control the movement and deformation of overlying rock behind the seam mining, the high-water expansion material strips belt placement method of the control overlying rock movement and deformation of problem such as the exploitation rate of recovery that coal is pressed in solution " three times " is low and safe coefficient is low, be particularly useful for the coal-face of thickness in coal seam below 3 meters.
The technical solution adopted for the present invention to solve the technical problems is: a kind of high-water expansion material strips belt placement method of controlling the overlying rock movement and deformation, and it is characterized in that: this method is undertaken by following step:
(1) analyzes the coal roof lithologic feature, find out rock stratum---the key stratum that the exploitation back plays a major role to face of land sedimentation and deformation, calculate and actual observation, determine the limit span L and the safe span M of key stratum by theory, according to the support strength of filler, calculate and determine filling strip width N;
(2) arrange the filling band: perpendicular or parallelly arrange the filling band at interval, make M+N≤L in coal-face;
The filler of described filling band is selected the high-water expansion material for use, the slip that this high-water expansion material is made up of flyash, expansion agent, delayer, curing compound and water, solid-to-liquid ratio is 1: 1.2~1.5, and expansion rate is 10~30%, and each raw material is formed by following proportioning:
Flyash 300~400kg/m 3
Expansion agent 0.2~1kg/m 3
Delayer 0.6~0.8kg/m 3
Curing compound 30~100kg/m 3
Water 800~1000kg/m 3
Wherein, described expansion agent is an aluminium powder, and delayer is a land plaster, and curing compound is lime or cement.
Pass through high-water expansion filling material; can satisfy timely filling, fully connect the requirement of top, rapid solidification; filling band and key stratum can carry out effective support to overlying rock, just as bridge pier and bridge, thereby reach the purpose of controlling surface deformable, protection above ground structure and attachment.
It is as follows to select for use the high-water expansion material to carry out the processing step of filling:
A, making filling counterfort comprise side barricade and bottom surface barricade, and side barricade and bottom surface barricade surround the filling area;
B, the high-water expansion material is transported in the filling area that filling counterfort surrounds, treats to stop filling operation after the filling area is full of by pipeline, and with the top opening sealing of filling area.
Described method of arranging the filling band perpendicular to coal-face:
From open-off cut, equally spaced layout is perpendicular to the filling band of coal-face in the goaf, it is filling band horizontally set, spacing≤L between the two adjacent filling bands, the cycle of filling operation on the coal seam directly the complete situation in top decide, can fill with the every circulation one of coal-face, also can be in one-period is pressed step pitch one fill, carry out cycling by above-mentioned steps, stop adopting line up to arrival and stop operation.
For above-mentioned strip filling method, directly push up not inbreak in the district as long as wait to fill, enrich on the top that connects that does not influence filling, and the length that just can suitably increase primary filling like this can be by reducing the effect that the filling number of times reach the raising pack effectiveness.
The described method that is parallel to coal-face layout filling band:
From open-off cut, equally spaced layout is parallel to the filling band of coal-face in the goaf, and promptly the filling band vertically is provided with, and filling operation is carried out with the propelling of coal-face, and concrete operations are as follows:
A, from open-off cut beginning, during the advance distance of coal-face≤M, begin to set up the filling band;
B, when the filling width reaches N, stop filling, coal-face continue to advance;
C, be advanced into when coal-face takes up from a last filling bar≤M apart from the time, set up the filling band again;
Carry out cycling by above-mentioned steps, stop adopting line up to arrival and stop operation.
The present invention is applicable to the coal-face of thickness in coal seam below 3 meters, according to the key stratum theory of CONTROL OF STRATA MOVEMENT, utilizes the high-water expansion material its goaf to be carried out the part placement method of strip-type.This strip filling method can realize the high-recovery exploitation of the coal resources under any condition; and can improve the safe coefficient of coal-face significantly; do not influence normal process for stoping; easy to operate; when realizing no pillar extraction; the sedimentation and deformation on the coal seam overlying rock movement and deformation and the face of land can be controlled at building allows in the very low range of distortion; realize that the mild even deflection in the face of land is minimum; reach protection face of land building and attachment; do not cause ground surface environment to destroy; realize green exploitation purpose; and by utilizing key stratum and intensity abundance; the girder structure that initiatively connects the filling band formation on top supports the above rock stratum of key stratum, reaches the purpose of control overlying rock movement and deformation.
The beneficial effect that the present invention had is: a kind of high-water expansion material strips belt placement method of controlling the overlying rock movement and deformation is provided, be applicable to the coal-face of thickness in coal seam below 3 meters, key stratum theory according to CONTROL OF STRATA MOVEMENT, can take different filling ratios at the lithology of coal seam overlying rock, make the movement and deformation of overlying rock be controlled in the allowed band fully, and, can determine most economical pack completeness by the control key stratum, realize maximizing the benefits; When realizing no pillar extraction, the sedimentation and deformation on the coal seam overlying rock movement and deformation and the face of land can be controlled at building allows in the very low range of distortion, realize that the mild even deflection in the face of land is minimum, reach protection face of land building and attachment, do not cause ground surface environment to destroy, realize the green purpose of exploiting; Utilize the high-water expansion material that the part placement method of strip-type is carried out in the goaf, can realize the high-recovery exploitation of the coal resources under any condition, and can improve the safe coefficient of coal-face significantly; Do not influence normal mining operation in the stowing operation and arrange little impact on production, production efficiency height.
Description of drawings
Fig. 1 is parallel to the structural representation that coal-face is arranged the filling band;
Fig. 2 is perpendicular to the structural representation that coal-face is arranged the filling band.
Among the figure: 1, goaf; 2, filling area; 3, coal-face
The specific embodiment
Below in conjunction with accompanying drawing embodiments of the invention are described further:
The high-water expansion material strips belt placement method of control overlying rock movement and deformation, this method is undertaken by following step:
(1) analyzes the coal roof lithologic feature, find out rock stratum---the key stratum that the exploitation back plays a major role to face of land sedimentation and deformation, calculate and actual observation by theory, determine the limit span L and the safe span M of key stratum, support strength according to filler, calculate and determine filling strip width N, the girder structure that utilizes filling band and key stratum to form supports the above rock stratum of key stratum, reaches the purpose of control overlying rock movement and deformation;
(2) arrange the filling band: perpendicular or parallelly arrange the filling band at interval, make M+N≤L in coal-face;
The filler of described filling band is selected the high-water expansion material for use, the slip that this high-water expansion material is made up of flyash, expansion agent, delayer, curing compound and water, expansion agent is selected aluminium powder for use, and delayer is selected land plaster for use, curing compound is selected lime for use, each raw material is formed by following proportioning: flyash 300~400kg, aluminium powder 0.2~1kg, land plaster 0.6~0.8kg, cement 30~100kg, water 800~1000kg, solid-to-liquid ratio is 1: 1.2~1.5, expansion rate is 10~30%.Pass through high-water expansion filling material; can satisfy timely filling, fully connect the requirement of top, rapid solidification; filling band and key stratum can carry out effective support to overlying rock, just as bridge pier and bridge, thereby reach the purpose of controlling surface deformable, protection above ground structure and attachment.
It is as follows to select for use the high-water expansion material to carry out the processing step of filling:
A, making filling counterfort comprise side barricade and bottom surface barricade, and side barricade and bottom surface barricade surround the filling area;
B, the high-water expansion material is transported in the filling area that filling counterfort surrounds, treats to stop filling operation after the filling area is full of by pipeline, and with the top opening sealing of filling area.
Described method of arranging the filling band perpendicular to coal-face:
From open-off cut, equally spaced layout is perpendicular to the filling band of coal-face in the goaf, it is filling band horizontally set, spacing≤L between the two adjacent filling bands, the cycle of filling operation on the coal seam directly the complete situation in top decide, can be once with the every flow pack of coal-face, also can be in one-period be pressed step pitch filling once, carry out cycling by above-mentioned steps, stop adopting line up to arrival and stop operation.
For above-mentioned strip filling method, directly push up not inbreak in the district as long as wait to fill, enrich on the top that connects that does not influence filling, and the length that just can suitably increase primary filling like this can be by reducing the effect that the filling number of times reach the raising pack effectiveness.
The described method that is parallel to coal-face layout filling band:
From open-off cut, equally spaced layout is parallel to the filling band of coal-face in the goaf, and promptly the filling band vertically is provided with, and filling operation is carried out with the propelling of coal-face, and concrete operations are as follows:
A, from open-off cut beginning, during the advance distance of coal-face≤M, begin to set up the filling band;
B, when the filling width reaches N, stop filling, coal-face continue to advance;
C, be advanced into when coal-face takes up from a last filling bar≤M apart from the time, set up the filling band again;
Carry out cycling by above-mentioned steps, stop adopting line up to arrival and stop operation.The present invention is applicable to the coal-face of thickness in coal seam below 3 meters, according to the key stratum theory of CONTROL OF STRATA MOVEMENT, utilizes the high-water expansion material its goaf to be carried out the part placement method of strip-type.This strip filling method can realize the high-recovery exploitation of the coal resources under any condition; and can improve the safe coefficient of coal-face significantly; do not influence normal process for stoping; easy to operate; when realizing no pillar extraction; the sedimentation and deformation on the coal seam overlying rock movement and deformation and the face of land can be controlled at building allows in the very low range of distortion; realize that the mild even deflection in the face of land is minimum; reach protection face of land building and attachment; do not cause ground surface environment to destroy; realize green exploitation purpose; and by utilizing key stratum and intensity abundance; the girder structure that initiatively connects the filling band formation on top supports the above rock stratum of key stratum, reaches the purpose of control overlying rock movement and deformation.
Specifically the strip filling method in conjunction with six layers of coal and nine layers of coal specifies the present invention:
1, six layers of coal are arranged the filling band perpendicular to coal-face:
1. six layers of coal top board lithologic analysis and filling size are determined:
Six layers of coal are divided into two-layer up and down.Thick 0.2~0.3 meter of day-coal, thick 0.6~0.8 meter of lower floor's coal, complete thick about 1 meter; Middle horsestone is 1 meter thick flour sand or powder mud alternating layers.For ease of test, 2 meters of full-seam minings, immediate roof is 5 meters thick siltstones, is 0.4 meter thick seam on it, is 5 meters thick siltstones on again.By analysis, this type of first weight step pitch is greater than 20 meters, between 20~30 meters.For safety, determine that limit span is 25 meters, safe span is 20 meters, and coal-face adopts the inclination longwell to face upward and adopts layout, and 90 meters of face lengths are arranged a filling band, 15 meters of filling bar bandwidth, pack completeness 50% for 15 meters at interval;
2. the filling step of mining:
From the coal-face open-off cut beginning, build a filling counterfort, filling at interval every 15 meters.With the propelling of coal-face, during three or eight systems, two classes of coal minings, one class of filling; During four or six systems, class Three mines, and one class of filling stops adopting line until coal-face, as shown in Figure 2.
Because it is timely that this kind mode is exploited the back filling, do not cause goaf top plate to sink, through ground observation, do not observe deflection, therefore this high-water expansion material strips belt part placement method can be good at controlling the movement and deformation of overlying rock.
2, nine layers of coal are parallel to coal-face layout filling band:
1. nine layers of coal top board lithologic analysis and filling size are determined:
The nine layers of direct top of coal major part are 3.0 meters thick igneous rock, and part piece section is a mud stone, are the limestone about 1 meter on it, are 4.3 meters thick siltstones and 4.0 meters thick packsands and siltstone packsand alternating layers on again.According to experience with mining, this type first weight step pitch is greater than 15 meters, between 15 meters~25 meters.For safety, determine that limit span is 20 meters, safe span is 15 meters, 10 meters of packwall width, 10 meters at interval of two adjacent filling bands, pack completeness 50%;
2. the filling step of mining:
Coal-face advances from open-off cut, when reaching 10 meters, the goaf builds filling counterfort I at the close standing props place, when work plane advances 2 meters again, build filling counterfort II at the close standing props place, form confined space between barricade I and the II like this, reserve filling mouth place from air return way barricade II and carry out filling, finish filling for the first time.Build barricade III for 2 meters at interval, carry out the filling second time, so flow pack is five times, 10 meters of filling bands are wide, use with quadrat method filling second band after 10 meters at interval again, and so circulation finishes until first coal-face, carry out adjacent working face mining again, as shown in Figure 1.
Through observation,, adopt dark 230~270 meters 1.2~1.5 meters of mining heights, 10 meters at interval of fillings, 10 meters of filling bar bandwidth, pack completeness 50%, under the situation of the rate of extraction 100%, the surface settlement after the exploitation is at 0~50mm, and the effect of control overlying rock movement and deformation also clearly.

Claims (6)

1. high-water expansion material strips belt placement method of controlling the overlying rock movement and deformation, it is characterized in that: this method is undertaken by following step:
(1) analyzes the coal roof lithologic feature, find out rock stratum---the key stratum that the exploitation back plays a major role to face of land sedimentation and deformation, calculate and actual observation, determine the limit span L and the safe span M of key stratum by theory, according to the support strength of filler, calculate and determine filling strip width N;
(2) arrange the filling band: perpendicular or parallelly arrange the filling band at interval, make M+N≤L in coal-face;
The filler of above-mentioned filling band is selected the high-water expansion material for use.
2. the high-water expansion material strips belt placement method of control overlying rock movement and deformation according to claim 1 is characterized in that: it is as follows to select for use the high-water expansion material to carry out the processing step of filling:
A, making filling counterfort comprise side barricade and bottom surface barricade, and side barricade and bottom surface barricade surround the filling area;
B, the high-water expansion material is transported in the filling area that filling counterfort surrounds, treats to stop filling operation after the filling area is full of by pipeline, and with the top opening sealing of filling area.
3. the high-water expansion material strips belt placement method of control overlying rock movement and deformation according to claim 1 is characterized in that: described method of arranging the filling band perpendicular to coal-face:
From open-off cut, equally spaced layout is perpendicular to the filling band of coal-face in the goaf, it is filling band horizontally set, spacing≤L between the two adjacent filling bands, the cycle of filling operation on the coal seam directly the complete situation in top decide, can fill with the every circulation one of coal-face, also can be in one-period is pressed step pitch one fill, carry out cycling by above-mentioned steps, stop adopting line up to arrival and stop operation.
4. the high-water expansion material strips belt placement method of control overlying rock movement and deformation according to claim 1 is characterized in that: the described method that is parallel to coal-face layout filling band:
From open-off cut, equally spaced layout is parallel to the filling band of coal-face in the goaf, and promptly the filling band vertically is provided with, and filling operation is carried out with the propelling of coal-face, and concrete operations are as follows:
A, from open-off cut beginning, during the advance distance of coal-face≤M, begin to set up the filling band;
B, when the filling width reaches N, stop filling, coal-face continue to advance;
C, be advanced into when coal-face takes up from a last filling bar≤M apart from the time, set up the filling band again;
Carry out cycling by above-mentioned steps, stop adopting line up to arrival and stop operation.
5. the high-water expansion material strips belt placement method of control overlying rock movement and deformation according to claim 1, it is characterized in that: the slip that described high-water expansion material is made up of flyash, expansion agent, delayer, curing compound and water, solid-to-liquid ratio is 1: 1.2~1.5, expansion rate is 10~30%, and each raw material is formed by following proportioning:
Flyash 300~400kg/m 3
Expansion agent 0.2~1kg/m 3
Delayer 0.6~0.8kg/m 3
Curing compound 30~100kg/m 3
Water 800~1000kg/m 3
6. the high-water expansion material strips belt placement method of control overlying rock movement and deformation according to claim 5, it is characterized in that: described expansion agent is an aluminium powder, and delayer is a land plaster, and curing compound is lime or cement.
CN 201010565597 2010-11-30 2010-11-30 Strip-type filling method of high water-swelling material for controlling movement and deformation of overlying strata CN102011611A (en)

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CN2011103886701A CN102392644A (en) 2010-11-30 2011-11-30 Stripped fluid expansion filling mining method for below middle thick coal seam

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