CN103953343B - A kind of method coal seam tight roof being controlled to caving - Google Patents
A kind of method coal seam tight roof being controlled to caving Download PDFInfo
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- CN103953343B CN103953343B CN201410131025.5A CN201410131025A CN103953343B CN 103953343 B CN103953343 B CN 103953343B CN 201410131025 A CN201410131025 A CN 201410131025A CN 103953343 B CN103953343 B CN 103953343B
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Abstract
The method of caving is controlled to coal seam tight roof, relates to colliery stope and roadway surrounding rock control technology, solve that existing method affects by geostatic stress, poor controllability, the problem that has pollution, be not suitable for high gas layer.Concrete steps of the present invention: 1. just adopt the stage along fully-mechanized mining working open-off cut, just adopt and normal recovery phase along work plane air return way and haulage gate near coal column side, to Roof Rock Strata of Coal Seam construction drill; 2. carry out hydraulic slotted liner technique along boring, slot direction is consistent with the trend of open-off cut, air return way, haulage gate respectively; 3. carry out sealing of hole at the two ends of boring, and implement fracturing in the borehole, the fracturing fracture produced in adjacent boring is communicated with.The present invention be used for high gas layer, tight roof control caving, have controllability good, do not affect by geostatic stress, pollution-free, be easy to operation advantage.
Description
Technical field
The present invention relates to colliery stope and roadway surrounding rock control technology, particularly a kind of coal seam tight roof controls the method for caving.
Background technology
When exploited roof is competent bed, or compose in certain altitude and have the complete competent bed of heavy thickness, or top, coal seam coal thickness large and hard time, adopt at the beginning of work plane and work plane normal back production time, there will be tight roof above coal seam to hang top at above goaf and do not emit, the phenomenon that top coal difficulty is put, at this moment goaf surrounding medium inner accumulated great number of elastic energy, not only affect the stability in tunnel in coal body near goaf, and once inbreak, very easily damage support by pressure, cause the distinguished and admirable disorder in down-hole, form hurricane, the unexpected large area in ground is subsided, even cause casualties.Such as certain ore deposit shallow buried coal seam, top board belongs to sub-tight roof, but lift height is large, during advance of the face 70m, first weighting occurs, occur being cut to the overlying strata on earth's surface are entirely thick by work plane, work plane pillar is bent, and occurs hurricane, distinguished and admirablely to drive in the wrong direction, to emerge black smoke from secondary footrill, form graben on earth's surface.
Known coal seam tight roof controls caving method construction drill on the tight roof of coal seam, then implements fracturing in the borehole or load explosive to carry out explosion or load chemically expansible agent carrying out static blasting etc.These methods can obtain some effects under certain condition, but also Shortcomings, as fracturing the crack that formed control by geostatic stress, therefore, need consider during fracturing to cut the spatial relationship between position, top and geostatic stress; It is large to there is power in charge explosion method, and poor controllability, has the problems such as pollution, is not suitable for the high coal seam of gas bearing capacity and rock stratum, as goaf or high gas layer etc.; Mainly there is poor controllability, high in cost of production shortcoming in static blasting.
Summary of the invention
Object of the present invention is intended to the shortcoming overcoming prior art, there is provided a kind of and the method for caving controlled to coal seam tight roof, solve that existing tight roof controls that caving method affects by geostatic stress, poor controllability, the technical problem that has pollution, be not suitable for high gas layer.
The present invention is achieved through the following technical solutions:
Coal seam tight roof is controlled to a method for caving, comprising: construction drill in roof, implement fracturing in the borehole, it is characterized in that: the concrete steps of described control caving method are:
1. just adopt the stage along fully-mechanized mining working open-off cut, just adopt and normal recovery phase along work plane air return way and haulage gate near coal column side, to Roof Rock Strata of Coal Seam construction drill;
2. carry out hydraulic slotted liner technique along described boring, slot direction is consistent with the trend of described open-off cut, described air return way, described haulage gate respectively;
3. after slot completes, carry out sealing of hole at the two ends of described boring, and implement fracturing in described boring, the fracturing fracture produced in adjacent described boring is communicated with.
Further, step 1. in, for single competent bed top board, described Roof Rock Strata of Coal Seam is made up of immediate roof and old top; For compound competent bed top board, the old top that described Roof Rock Strata of Coal Seam is made up of immediate roof and, soft stratum layering hard by multilayer is formed.
Further, step 1. in, along the open-off cut of fully-mechanized mining working to Roof Rock Strata of Coal Seam construction drill, after open-off cut construction, before working face wall exploitation, on the roof strata of hydraulic support rear position, along the boring perpendicular to the oblique working face wall of advance of the face direction construction one row; Along work plane air return way and haulage gate to Roof Rock Strata of Coal Seam construction drill, be first advance rib one segment distance, on roof strata outside the tunnel near coal column, the boring of construction one row oblique work plane front entity coal; For single competent bed top board, the immediate roof that boring is passed through above coal seam, arrive old top and overlying rock interface place, for compound competent bed top board, immediate roof above coal seam, the competent bed layering of old top, the soft stratum layering of old top are passed through in boring, arrive Lao Ding the top one deck competent bed layered boundary; The spacing of adjacent boring is 1 ~ 20m, and the degree of depth of boring is 10 ~ 50m, and drilling axis direction and top board vertical line angular separation are 1 ~ 45 °.
Further, step 2. in, for single competent bed top board, described hydraulic slotted liner technique is in open-off cut after all drilling constructions, before working face mining, along all borehole axial from 1m place at the bottom of hole, adopt fallback mode to flow to boring both sides symmetry by high-pressure water shot and implement hydraulic slotted liner technique; Described hydraulic slotted liner technique is after the drilling construction in air return way and haulage gate, and from the upper and lower end of open-off cut, the boring both sides symmetry adopting fallback mode to be flowed in air return way and haulage gate by high-pressure water shot implements hydraulic slotted liner technique; Slot stops to more than old top and immediate roof interface along borehole axial 1m place, and the slot degree of depth on boring both sides is greater than 10mm respectively, and slot width is greater than 10mm respectively.
Further, step 2. in, for compound competent bed top board, always will push up interior competent bed layering along borehole axial from foot of hole to aperture segmentation, i.e. first paragraph, second segment, described hydraulic slotted liner technique is in open-off cut after all drilling constructions, before working face mining, segmentation hydraulic slotted liner technique is implemented to all boring, namely in each always top competent bed layering, hydraulic slotted liner technique is implemented, first paragraph slot pushes up competent bed layered boundary along borehole axial always from apart from the superiors, adopt fallback mode to flow to boring both sides symmetry by high-pressure water shot and implement hydraulic slotted liner technique, to always pushing up the above 1m place of competent bed lower limits apart from the superiors only, hydraulic slotted liner technique in other section of old top competent bed layering is all according to said method carried out, the slot degree of depth on boring both sides is greater than 10mm respectively, and slot width is greater than 10mm respectively.
Further, step 3. in, for single competent bed top board, described sealing of hole carries out sealing of hole along the borehole axial in open-off cut to 1m scope, the above 1m scope of immediate roof and old topcross interface at the bottom of hole; Described sealing of hole be until working face wall push ahead exceed boring 1m and boring be within the scope of face end support supporting time, along the borehole axial in work plane haulage gate and air return way, sealing of hole is carried out to 1m scope, the above 1m scope of immediate roof and old topcross interface at the bottom of hole; Described sealed borehole length is 1m.
Further, step 3. in, for single competent bed top board, in described boring, implement fracturing, be in all boring of open-off cut implement a fracturing, fracturing fracture to boring both sides expansion, until fracturing fracture entirety be communicated with; Fracturing is implemented in described boring, that a fracturing is implemented to work plane haulage gate and air return way internal drilling, a fracturing carries out when work plane is pushed ahead and exceeded adjacent next bore position 1m and hole and be positioned at face end support supporting scope, in the same manner a fracturing is implemented, until be communicated with an adjacent upper fracturing fracture of holing to adjacent next one boring; Push ahead in process at work plane, all adopt a fracturing mode to carry out pressure break to boring all in haulage gate and air return way, until fracturing fracture entirety is communicated with.
Further, step 3. in, for compound competent bed top board, described sealing of hole carries out sealing of hole along borehole axial to not implementing slot boring within the scope of the upper and lower two ends 1m of first paragraph slot, in the boring of first paragraph slot, fracturing is implemented after sealing of hole, fracturing fracture is to the expansion of boring both sides, pressure break is stopped apart from time over half when extension length reaches adjacent drilling hole, then along borehole axial to second segment always push up in competent bed layering do not implement within the scope of upper and lower two ends 1m slot boring carry out sealing of hole, fracturing is implemented in the boring of second segment slot, fracturing fracture is to the expansion of boring both sides, pressure break is stopped apart from time over half when extension length reaches adjacent drilling hole, with identical sealing of hole and fracturing mode, competent bed layering is pushed up always to other section in boring and implement fracturing, in identical staged fracturing mode, pressure break is implemented to adjacent boring, until adjacent borehole fracturing fracture propagation is communicated with, split and cut all boring of intraocular and all adopt segmentation fracturing mode to carry out pressure break, until fracturing fracture entirety is communicated with, to the drilling and sealing in work plane haulage gate and air return way, treat that working face wall is pushed ahead to exceed boring 1m, and boring is when being within the scope of face end support supporting, along borehole axial, sealing of hole is carried out to the boring not implementing slot within the scope of the upper and lower two ends 1m of first paragraph slot, in the boring of first paragraph slot, fracturing is implemented after sealing of hole, pressure break is stopped apart from time over half when fracturing fracture extension length reaches adjacent drilling hole, then along borehole axial, sealing of hole is carried out to the boring not implementing slot within the scope of the upper and lower two ends 1m of second segment slot, in the boring of second segment slot, fracturing is implemented after sealing of hole, pressure break is stopped apart from time over half when fracturing fracture extension length reaches adjacent drilling hole, with identical sealing of hole and fracturing mode, competent bed layering is pushed up always to other section in boring and implement fracturing, push ahead at work plane and exceed adjacent next bore position 1m, and boring is when being positioned at face end support supporting scope, in the same manner segmentation fracturing is implemented to adjacent next one boring, until be communicated with an adjacent upper fracturing fracture of holing, sealed borehole length is 1m.
The present invention compared with prior art, owing to providing a kind of control caving method that hydraulic slotted liner technique and fracturing combine, work plane roof is made to form clamped, the three unconfined hanging decks in limit of rib on one side, this hanging deck can spontaneous caving with the advance of the face, fundamentally eliminates old top first weighting and top board large area and hangs the stope that reveals and cause and the restive hidden danger of roadway surrounding rock.
The present invention is used for the control caving of complicated geological, high gas layer under mining condition, tight roof, have controllability good, do not affect by geostatic stress, pollution-free, the advantage that is easy to operation.
Accompanying drawing explanation
Fig. 1 is the technology arrangement figure that the present invention is directed to the caving of single competent bed Roof Control;
Fig. 2 is I-I sectional drawing of Fig. 1;
Fig. 3 is II-II sectional drawing of Fig. 1;
Fig. 4 is III-III sectional drawing of Fig. 1;
Fig. 5 is IV-IV sectional drawing of Fig. 1;
Fig. 6 is the technology arrangement figure that the present invention is directed to the caving of compound competent bed Roof Control;
Fig. 7 is V-V sectional drawing of Fig. 6;
Fig. 8 is VI-VI sectional drawing of Fig. 6;
Fig. 9 is VII-VII sectional drawing of Fig. 6;
Figure 10 is VIII-VIII sectional drawing of Fig. 6.
Detailed description of the invention
Embody the exemplary embodiments of feature & benefits of the present invention, will describe in detail in the following description by reference to the accompanying drawings.Be understood that the present invention can have various changes in different embodiments, it neither departs from protection scope of the present invention, and explanation wherein and to be shown in be use when explain in essence, and be not used to limit the present invention.
Embodiment 1:
As shown in Fig. 1,2,3,4,5, a kind of method to coal seam single competent bed Roof Control caving, at a flat seam 8(thickness 3m), the mud stone of immediate roof 9(thickness 2m), the limestone of old top 10(thickness 10m) in, after open-off cut 5 is constructed, before working face wall 1 not yet exploits, on the roof strata at hydraulic support 2 rear, along the boring 6 perpendicular to the oblique working face wall 1 of advance of the face direction construction one row.The spacing of adjacent boring is 5m, drilling axis direction and 15 °, top board vertical line angular separation, drilling depth 12.5m, and boring 6 immediate roofs 9 of passing through above coal seam 8 arrive old top 10 and overlying rock 11 interface place (referring to Fig. 2); After in open-off cut 5, all boring 6 is constructed, before working face mining, hydraulic slotted liner technique 13(is implemented referring to Fig. 3 to all boring 6), hydraulic slotted liner technique 13 is realized by high-pressure water jet method, high-pressure water jet is along boring 6 axially from 1m place at the bottom of hole, and retrusive is symmetrical hydraulic slotted liner technique to boring 6 both sides, and the slot degree of depth on 6 both sides of holing is greater than 10mm respectively, slot width is greater than 10mm respectively, and slot stops to more than old top 10 and immediate roof 9 interface along borehole axial 1m place; Said process is all adopted to carry out slot to the boring 6 in open-off cut 5.After slot completes, along boring 6 axially to 1m scope, immediate roof 9 at the bottom of hole and pushing up the above 1m scope of 10 interface carries out sealing of hole 12 always, sealed borehole length is 1m; Then in boring 6, implement a fracturing (referring to Fig. 3), fracturing fracture 14 is expanded to boring 6 both sides.In the same manner a fracturing is implemented to adjacent boring 6 until adjacent boring 6 fracturing fractures 14 expand connection.A fracturing mode is all adopted to carry out pressure break to boring 6 all in open-off cut 5, until fracturing fracture 14 entirety is communicated with.
As shown in Figure 1, in work plane air return way 3 and haulage gate 4, in first advance rib 1 one segment distance, on the roof strata outside the tunnel near coal column 7, the boring 6(of construction one row oblique work plane front entity coal is referring to Fig. 4 and Fig. 5); The spacing of adjacent boring is 5m, drilling axis direction and 15 °, top board vertical line angular separation, drilling depth 12.5m, and the boring immediate roof 9 of passing through above coal seam 8 arrives the interface place (referring to Fig. 4 and Fig. 5) of main roof strata 10 and overlying rock 11; After two crossheading internal drilling constructions, from open-off cut about 5 end, hydraulic slotted liner technique 13(is implemented referring to Fig. 3 to the boring 6 in two crossheadings), hydraulic slotted liner technique 13 is realized by high-pressure water jet method.High-pressure water jet is axial from 1m position at the bottom of hole along boring 6, retrusive is symmetrical hydraulic slotted liner technique to boring 6 both sides, the slot degree of depth on boring both sides is greater than 10mm respectively, and slot width is greater than 10mm respectively, and slot stops along borehole axial 1m place to distance always top 10 and immediate roof 9 interface.Said process is all adopted to carry out slot to the boring 6 in work plane haulage gate 5 and air return way 4.After slot completes, until working face wall push ahead exceed boring 1m and boring is within the scope of face end support supporting time, along borehole axial to 1m scope at the bottom of hole, immediate roof 9 and pushing up the above 1m scope of 10 interface carries out sealing of hole 12 always; Sealed borehole length is 1m.Then in boring 6, implement a fracturing (referring to Fig. 3), fracturing fracture 14 is to the expansion of boring both sides.Work plane push ahead exceed adjacent next bore position 1m and boring be positioned at face end support supporting scope time, to adjacent the next one boring in the same manner implement a fracturing, until be communicated with an adjacent upper fracturing fracture of holing 14.Push ahead in process at work plane, all adopt a fracturing mode to carry out pressure break to boring 6 all in two crossheadings, until fracturing fracture 14 entirety is communicated with.
After above-mentioned fracturing, work plane roof forms clamped, the three unconfined hanging decks in limit of rib on one side, this hanging deck, with advance of the face spontaneous caving, fundamentally eliminates old top first weighting and top board large area and hangs the stope that reveals and cause and the restive hidden danger of roadway surrounding rock.
Embodiment 2:
As shown in Fig. 6,7,8,9,10, a kind of method to coal seam compound competent bed Roof Control caving, at a flat seam 8(thickness 3m), the mud stone of immediate roof 9(thickness 2m), old top packsand layering 15(thickness 4m), old top mud stone layering 16(thickness 1m), old apex stone limestone layering 17(thickness 5m) in, after open-off cut 5 is constructed, before working face wall 1 not yet exploits, on the roof strata at hydraulic support 2 rear, along the boring 6 perpendicular to the oblique working face wall 1 of advance of the face direction construction one row.The spacing of adjacent boring is 5m, drilling axis direction and 15 °, top board vertical line angular separation, drilling depth 12.5m, immediate roof 9, always top sandstone layering 15, always top mud stone layering 16 and old apex stone limestone layering 17 above coal seam 8 are passed through in boring, arrive overlying rock 11 and old apex stone limestone layering 17 interface place.In open-off cut 5 after all drilling constructions, before working face mining, segmentation hydraulic slotted liner technique 13 is implemented to all boring 6.First paragraph slot axially starts from 1m place at the bottom of hole along boring 6, adopts fallback mode to flow to boring 6 both sides symmetry by high-pressure water shot and implements hydraulic slotted liner technique 13, and slot is to apart from old apex stone limestone layering 17 and oldly push up the above 1m of mud stone layering 16 interface and stop everywhere; Second segment slot is along holing 6 axially from distance old top mud stone layering 16 and always pushing up below fine sand rock stratum 15 interface 1m place, adopt fallback mode to flow to boring 6 both sides symmetry by high-pressure water shot and implement hydraulic slotted liner technique 13, slot only pushes up the above 1m place of packsand layering 15 interface to apart from immediate roof 9 with old, the slot degree of depth on boring both sides is greater than 10mm respectively, and slot width is greater than 10mm respectively.Said process is all adopted to carry out slot to open-off cut 5 internal drilling.After slot completes, axially carry out sealing of hole 12 to not implementing slot boring within the scope of the upper and lower two ends 1m of first paragraph slot along boring 6, sealed borehole length is 1m.In the boring of first paragraph slot, implement fracturing after sealing of hole, fracturing fracture 14, to the expansion of boring both sides, stops pressure break when extension length reaches more than 2.5m.Then axially carry out sealing of hole 12 to not implementing slot boring within the scope of the upper and lower two ends 1m of second segment slot along boring 6, sealed borehole length is 1m.In the boring of second segment slot, implement fracturing after sealing of hole, fracturing fracture 14, to the expansion of boring both sides, stops pressure break when extension length reaches more than 2.5m.Pressure break is implemented to adjacent boring until the expansion of adjacent borehole fracturing crack 14 is communicated with in identical staged fracturing mode.Segmentation fracturing mode is all adopted to carry out pressure break to boring 6 all in open-off cut 5, until fracturing fracture 14 entirety is communicated with.
As shown in Figure 6, in work plane air return way 3 and haulage gate 4, in first advance rib 1 one segment distance, outside the tunnel near coal column 7, the boring 6(of construction one row oblique work plane front entity coal is referring to Fig. 9,10).The adjacent spacing of wells is 5m, drilling axis direction and 15 °, top board vertical line angular separation, drilling depth 12.5m, immediate roof 9, always top packsand layering 15, always top mud stone layering 16 and old apex stone limestone layering 17 above coal seam 8 are passed through in boring, arrive overlying rock 11 and old apex stone limestone layering 17 interface place.After two crossheading internal drilling constructions, from open-off cut about 5 end, segmentation hydraulic slotted liner technique 13(is implemented referring to Fig. 8 to two crossheading internal drillings 6).First paragraph slot axially starts from 1m place at the bottom of hole along boring 6, to apart from old apex stone limestone layering 17 and oldly push up the above 1m of mud stone layering 16 interface and stop everywhere; Second segment slot, along holing 6 axially from apart from old top mud stone layering 16 and always pushing up below packsand layering 15 interface 1m place, only pushes up the above 1m place of packsand layering 15 interface to apart from immediate roof 9 with old.Slot is along boring 6 axially from 1m place at the bottom of hole, and retrusive symmetry is carried out, and the slot degree of depth on boring both sides is greater than 10mm respectively, and slot width is greater than 10mm respectively.Said process is all adopted to carry out slot to the boring 6 in work plane haulage gate 5 and air return way 4.After slot completes, until working face wall push ahead exceed boring 1m and boring 6 is within the scope of face end support supporting time, axially carries out sealing of hole 12 to not implementing slot boring within the scope of the upper and lower two ends 1m of first paragraph slot along boring 6, sealed borehole length is 1m.In the boring of first paragraph slot, implement fracturing (referring to Fig. 8) after sealing of hole, fracturing fracture 14, to the expansion of boring both sides, stops pressure break when extension length reaches more than 2.5m.Then axially carry out sealing of hole 12 to not implementing slot boring within the scope of the upper and lower two ends 1m of second segment slot along boring 6, sealed borehole length is 1m.In the boring of second segment slot, implement fracturing (referring to Fig. 8) after sealing of hole, fracturing fracture 14, to the expansion of boring both sides, stops pressure break when extension length reaches more than 2.5m.Work plane push ahead exceed adjacent next bore position 1m and boring is positioned at face end support supporting scope time, in the same manner segmentation fracturing is implemented to adjacent next one boring, until with adjacent upper one hole 6 fracturing fracture 14 be communicated with.Push ahead in process at work plane, all adopt segmentation fracturing mode to carry out pressure break to boring 6 all in two crossheadings, until fracturing fracture 14 entirety is communicated with.
After above-mentioned fracturing, work plane roof forms clamped, the three unconfined hanging decks in limit of rib on one side, this hanging deck, with advance of the face spontaneous caving, fundamentally eliminates old top first weighting and top board large area and hangs the stope that reveals and cause and the restive hidden danger of roadway surrounding rock.
Embodiment 3:
As shown in Fig. 1,2,3,4,5, a kind of method to coal seam single competent bed Roof Control caving, at a flat seam 8(thickness 3m), the mud stone of immediate roof 9(thickness 2m), the limestone of old top 10(thickness 5m) in, the spacing of adjacent boring is 20m, drilling axis direction and 45 °, top board vertical line angular separation, drilling depth 10m, controls the method for caving with embodiment 1.
Embodiment 4:
As shown in Fig. 6,7,8,9,10, a kind of method to coal seam compound competent bed Roof Control caving, at a flat seam 8(thickness 3m), the mud stone of immediate roof 9(thickness 4m), old top packsand layering 15(thickness 16m), old top mud stone layering 16(thickness 5m), old apex stone limestone layering 17(thickness 25m) in, the spacing of adjacent boring is 1m, drilling axis direction and 1 °, top board vertical line angular separation, drilling depth 50m, controls the method for caving with embodiment 2.
The present invention specifically can implement in a variety of forms and not depart from spirit or the essence of invention, so be to be understood that, above-described embodiment is not limited to aforesaid details, and should explain widely in claim limited range, therefore fall into change in claim or its equivalent scope and remodeling and all should be claim and contained.
Claims (1)
1. one kind controls the method for caving to coal seam tight roof, comprise step: 1. just adopt the stage along fully-mechanized mining working open-off cut, just adopt and normal recovery phase along work plane air return way and haulage gate near coal column side, to Roof Rock Strata of Coal Seam construction drill, for single competent bed top board, described Roof Rock Strata of Coal Seam is made up of immediate roof and the hard old top of single thick-layer, for compound competent bed top board, the old top that described Roof Rock Strata of Coal Seam is made up of immediate roof and, soft stratum layering hard by multilayer is formed; 2. carry out hydraulic slotted liner technique along described boring, slot direction is consistent with the trend of described open-off cut, described air return way, described haulage gate respectively; 3. after slot completes, carry out sealing of hole at the two ends of described boring, and implement fracturing in described boring, the fracturing fracture produced in adjacent described boring is communicated with; It is characterized in that:
Described step 1. in, along the open-off cut of fully-mechanized mining working to Roof Rock Strata of Coal Seam construction drill, after open-off cut construction, before working face wall not yet exploits, on the roof strata of hydraulic support rear position, along the boring perpendicular to the oblique working face wall of advance of the face direction construction one row; Along work plane air return way and haulage gate to Roof Rock Strata of Coal Seam construction drill, be first advance rib one segment distance, on roof strata outside the tunnel near coal column, the boring of construction one row oblique work plane front entity coal; For single competent bed top board, the immediate roof that boring is passed through above coal seam, arrive old top and overlying rock interface place, for compound competent bed top board, immediate roof above coal seam, the competent bed layering of old top, the soft stratum layering of old top are passed through in boring, arrive Lao Ding the top one deck competent bed layered boundary; The spacing of adjacent boring is for being 1 ~ 20m, and the degree of depth of boring is 10 ~ 50m, and drilling axis direction and top board vertical line angular separation are 1 ~ 45 °;
Described step 2. in, for single competent bed top board, described hydraulic slotted liner technique is in open-off cut after all drilling constructions, before working face mining, along all borehole axial from 1m place at the bottom of hole, adopt fallback mode to flow to boring both sides symmetry by high-pressure water shot and implement hydraulic slotted liner technique, described hydraulic slotted liner technique is after the drilling construction in air return way and haulage gate, from the upper and lower end of open-off cut, the boring both sides symmetry adopting fallback mode to be flowed in air return way and haulage gate by high-pressure water shot implements hydraulic slotted liner technique, slot stops to more than old top and immediate roof interface along borehole axial 1m place, the slot degree of depth on boring both sides is greater than 10mm respectively, slot width is greater than 10mm respectively, for compound competent bed top board, always will push up interior competent bed layering along borehole axial from foot of hole to aperture segmentation, described hydraulic slotted liner technique is in open-off cut after all drilling constructions, before working face mining, segmentation hydraulic slotted liner technique is implemented to all boring, namely in each always top competent bed layering, hydraulic slotted liner technique is implemented, first paragraph slot is along borehole axial from apart from the superiors push up competent bed layered boundary 1m place always, adopt fallback mode to flow to boring both sides symmetry by high-pressure water shot and implement hydraulic slotted liner technique, to always pushing up the above 1m place of competent bed lower limits apart from the superiors only, hydraulic slotted liner technique in other section of old top competent bed layering is all according to said method carried out, the slot degree of depth on boring both sides is greater than 10mm respectively, and slot width is greater than 10mm respectively,
Described step 3. in, for single competent bed top board, described sealing of hole carries out sealing of hole along the borehole axial in open-off cut to 1m scope, the above 1m scope of immediate roof and old topcross interface at the bottom of hole, described sealing of hole be until working face wall push ahead exceed boring 1m and boring be within the scope of face end support supporting time, along the borehole axial in work plane haulage gate and air return way, sealing of hole is carried out to 1m scope, the above 1m scope of immediate roof and old topcross interface at the bottom of hole, described sealed borehole length is 1m, for single competent bed top board, fracturing is implemented in described boring, implement a fracturing in all boring of open-off cut, fracturing fracture is to the expansion of boring both sides, until fracturing fracture entirety is communicated with, fracturing is implemented in described boring, that a fracturing is implemented to work plane haulage gate and air return way internal drilling, a fracturing pushes ahead at work plane to exceed adjacent next bore position 1m, and boring is carried out when being positioned at face end support supporting scope, in the same manner a fracturing is implemented to adjacent next one boring, until be communicated with an adjacent upper fracturing fracture of holing, push ahead in process at work plane, a fracturing mode is all adopted to carry out pressure break to boring all in haulage gate and air return way, until fracturing fracture entirety is communicated with, for compound competent bed top board, described sealing of hole carries out sealing of hole along borehole axial to not implementing slot boring within the scope of the upper and lower two ends 1m of first paragraph slot, in the boring of first paragraph slot, fracturing is implemented after sealing of hole, fracturing fracture is to the expansion of boring both sides, pressure break is stopped apart from time over half when extension length reaches adjacent drilling hole, then along borehole axial, slot boring is not implemented to second segment upper and lower two ends 1m scope in competent bed layering of always pushing up and carry out sealing of hole, fracturing is implemented in the boring of second segment slot, fracturing fracture is to the expansion of boring both sides, pressure break is stopped apart from time over half when extension length reaches adjacent drilling hole, with identical sealing of hole and fracturing mode, competent bed layering is pushed up always to other section in boring and implement fracturing, in identical staged fracturing mode, pressure break is implemented to adjacent boring, until adjacent borehole fracturing fracture propagation is communicated with, split and cut all boring of intraocular and all adopt segmentation fracturing mode to carry out pressure break, until fracturing fracture entirety is communicated with, to the drilling and sealing in work plane haulage gate and air return way, treat that working face wall is pushed ahead to exceed boring 1m, and boring is when being within the scope of face end support supporting, along borehole axial, sealing of hole is carried out to the boring not implementing slot within the scope of the upper and lower two ends 1m of first paragraph slot, in the boring of first paragraph slot, fracturing is implemented after sealing of hole, pressure break is stopped apart from time over half when fracturing fracture extension length reaches adjacent drilling hole, then along borehole axial, sealing of hole is carried out to the boring not implementing slot within the scope of the upper and lower two ends 1m of second segment slot, in the boring of second segment slot, fracturing is implemented after sealing of hole, pressure break is stopped apart from time over half when fracturing fracture extension length reaches adjacent drilling hole, with identical sealing of hole and fracturing mode, competent bed layering is pushed up always to other section in boring and implement fracturing, push ahead at work plane and exceed adjacent next bore position 1m, and boring is when being positioned at face end support supporting scope, in the same manner segmentation fracturing is implemented to adjacent next one boring, until be communicated with an adjacent upper fracturing fracture of holing, sealed borehole length is 1m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410131025.5A CN103953343B (en) | 2014-04-03 | 2014-04-03 | A kind of method coal seam tight roof being controlled to caving |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410131025.5A CN103953343B (en) | 2014-04-03 | 2014-04-03 | A kind of method coal seam tight roof being controlled to caving |
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| Publication Number | Publication Date |
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| CN103953343A CN103953343A (en) | 2014-07-30 |
| CN103953343B true CN103953343B (en) | 2016-03-30 |
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| CN201410131025.5A Active CN103953343B (en) | 2014-04-03 | 2014-04-03 | A kind of method coal seam tight roof being controlled to caving |
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