CN103953343A - Method for controlling roof caving under condition of hardroof in coal seam - Google Patents
Method for controlling roof caving under condition of hardroof in coal seam Download PDFInfo
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- CN103953343A CN103953343A CN201410131025.5A CN201410131025A CN103953343A CN 103953343 A CN103953343 A CN 103953343A CN 201410131025 A CN201410131025 A CN 201410131025A CN 103953343 A CN103953343 A CN 103953343A
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Abstract
The invention relates to a method for controlling roof caving under condition of hardroof in coal seam, which belongs to the technical field of coal mining and tunnel surrounding rocks controlling, and solves the problems of influence by crustal stress, poor controllability, pollution and inapplicability for high gas seam in the prior art. The method comprises the following steps: 1) constructing and boring rock stratum at the top of the coal seam along an open-off cut of a fully mechanized working face at the beginning of mining process and along one side of a return air laneway and a transporting mining roadway of the working face close to a coal column at a primarily mining phase and at a normal robbing phase; 2)implementing the operation of hydraulic slotting along a borehole, wherein the slotting direction is respectively consistent with the direction of the open-off cut, the return air laneway and the transporting mining roadway; and 3) sealing holes at two ends of the borehole, implementing hydraulic fracturing in the boring, and communicating the pressing cracks generated in the adjacent boreholes. The method for controlling roof caving under condition of hardroof in coal seam is used for controlling roof caving of high gas seam and hardroof, and has the advantages of good controllability, no influence by crustal stress, no pollution and easy operation.
Description
Technical field
The present invention relates to colliery stope and roadway surrounding rock control technology, particularly a kind of coal seam tight roof is controlled the method for caving.
Background technology
When exploited roof is competent bed, or compose and have the complete competent bed of large thickness in certain altitude, or top, coal seam coal thickness is large and when hard, at work plane, just adopt and during the normal back production of work plane, there will be top, coal seam tight roof not emit on the outstanding top of above goaf, the phenomenon that top coal difficulty is put, at this moment goaf around coal body inner accumulated great number of elastic energy, not only affect the stability in tunnel near the coal body in goaf, once and 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.Certain ore deposit shallow buried coal seam for example, top board belongs to sub-tight roof, but lift height is large, and first weighting occurs during advance of the face 70m, appearance is thickly cut to the overlying strata on earth's surface are complete by work plane, and work plane pillar is bent, and occurs hurricane, distinguished and admirable drive in the wrong direction, from the secondary footrill black smoke of emerging, forms graben on earth's surface.
Known coal seam tight roof is controlled caving method construction drill on the tight roof of coal seam, then in boring, implements fracturing or pack explosive into carry out explosion or pack chemically expansible agent into carrying out static blasting etc.These methods can obtain some effects under certain condition, but also Shortcomings, crack as formed in fracturing is controlled by geostatic stress, therefore, need consider to cut the spatial relationship between position, top and geostatic stress during fracturing; Charge explosion method exists power large, and poor controllability has the problems such as pollution, is not suitable for coal seam and rock stratum that gas bearing capacity is high, 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 overcome the shortcoming of prior art, a kind of method of coal seam tight roof being controlled to caving is provided, solves that existing tight roof controls that caving method is subject to that geostatic stress affects, poor controllability, have pollution, be not suitable for the technical problem of high gas layer.
The present invention is achieved through the following technical solutions:
A method of coal seam tight roof being controlled to caving, comprising: to construction drill in roof, implement fracturing in boring, it is characterized in that: the concrete steps of described control caving method are:
1. the stage of just adopting 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 one side, to Roof Rock Strata of Coal Seam construction drill;
2. along described boring, carry out hydraulic slotted liner technique, slot direction is consistent with the trend of described open-off cut, described air return way, described haulage gate respectively;
3. after slot completes, at the two ends of described boring, carry out sealing of hole, and implement fracturing in described boring, the fracturing fracture producing in adjacent described boring is communicated with.
Further, step 1. in, for single competent bed top board, described Roof Rock Strata of Coal Seam consists of immediate roof and old top; For compound competent bed top board, described Roof Rock Strata of Coal Seam consists of immediate roof and old top hard by multilayer, that soft stratum layering forms.
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 the roof strata in the outside, tunnel near coal column, the boring of construction one row oblique work plane the place ahead entity coal; For single competent bed top board, the immediate roof of top, coal seam is passed through in boring, arrive old top and overlying rock interface place, for compound competent bed top board, immediate roof, the competent bed layering of old top, the soft stratum layering of old top of top, coal seam passed through in boring, arrives one deck competent bed layering border, Lao Ding the top; 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 at the bottom of hole, start, adopt fallback mode to flow to the symmetrical hydraulic slotted liner technique of implementing in boring both sides by high-pressure water shot; 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, adopts fallback mode to flow to the symmetrical hydraulic slotted liner technique of implementing in boring both sides in air return way and haulage gate by high-pressure water shot; Slot is to stopping along borehole axial 1m place apart from old top and immediate roof interface are above, and the slot degree of depth on boring both sides is greater than respectively 10mm, and slot width is greater than respectively 10mm.
Further, step 2. in, for compound competent bed top board, to always push up interior competent bed layering along borehole axial from foot of hole to aperture segmentation, it is first paragraph, second segment, described hydraulic slotted liner technique is in open-off cut after all drilling constructions, before working face mining, all boring is implemented to segmentation hydraulic slotted liner technique, in each old top competent bed layering, implement hydraulic slotted liner technique, first paragraph slot is along competent bed layering border, the old top of the borehole axial Cong Ju the superiors, adopt fallback mode to flow to the symmetrical hydraulic slotted liner technique of implementing in boring both sides by high-pressure water shot, the above 1m of old top competent bed lower limits of Zhi Ju the superiors place 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 respectively 10mm, and slot width is greater than respectively 10mm.
Further, step 3. in, for single competent bed top board, described sealing of hole be along the borehole axial in open-off cut to hole at the bottom of 1m scope, the above 1m scope of immediate roof and old topcross interface carry out sealing of hole; Described sealing of hole is to push ahead and surpass boring 1m and boring within the scope of face end support supporting time until working face wall, along the borehole axial in work plane haulage gate and air return way to hole at the bottom of 1m scope, the above 1m scope of immediate roof and old topcross interface carry out sealing of hole; Described sealed borehole length is 1m.
Further, step 3. in, for single competent bed top board, in described boring, implement fracturing, be to implementing a fracturing in all boring of open-off cut, fracturing fracture, to boring both sides expansion, is communicated with until fracturing fracture is whole; In described boring, implement fracturing, that work plane haulage gate and air return way internal drilling are implemented to a fracturing, a fracturing is at work plane, to push ahead to surpass when adjacent next bore position 1m and boring are positioned at face end support supporting scope to carry out, adjacent next boring is implemented to a fracturing in the same manner, until be communicated with the fracturing fracture of an adjacent upper boring; At work plane, push ahead in process, to all boring in haulage gate and air return way, all adopt a fracturing mode to carry out pressure break, until fracturing fracture is whole, be communicated with.
Further, step 3. in, for compound competent bed top board, described sealing of hole is to implementing slot boring within the scope of the upper and lower two ends 1m of first paragraph slot, not carry out sealing of hole along borehole axial, after sealing of hole, in the boring of first paragraph slot, implement fracturing, fracturing fracture is to the expansion of boring both sides, when reaching adjacent drilling hole, extension length stops pressure break when over half, then along borehole axial, to implementing slot boring within the scope of upper and lower two ends 1m in the competent bed layering of the old top of second segment, do not carry out sealing of hole, in the boring of second segment slot, implement fracturing, fracturing fracture is to the expansion of boring both sides, when reaching adjacent drilling hole, extension length stops pressure break when over half, with identical sealing of hole and fracturing mode, other section old top competent bed layering in holing is implemented to fracturing, in identical staged fracturing mode, adjacent boring is implemented to pressure break, 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 is whole, be communicated with, to the drilling and sealing in work plane haulage gate and air return way, to treat that working face wall is pushed ahead to surpass boring 1m, and while holing within the scope of face end support supporting, along borehole axial, to implementing the boring of slot within the scope of the upper and lower two ends 1m of first paragraph slot, do not carry out sealing of hole, after sealing of hole, in the boring of first paragraph slot, implement fracturing, when reaching adjacent drilling hole, fracturing fracture extension length stops pressure break when over half, then along borehole axial, to implementing the boring of slot within the scope of the upper and lower two ends 1m of second segment slot, do not carry out sealing of hole, after sealing of hole, in the boring of second segment slot, implement fracturing, when reaching adjacent drilling hole, fracturing fracture extension length stops pressure break when over half, with identical sealing of hole and fracturing mode, other section old top competent bed layering in holing is implemented to fracturing, at work plane, push ahead and surpass adjacent next bore position 1m, and when boring is positioned at face end support supporting scope, adjacent next boring is implemented to segmentation fracturing in the same manner, until be communicated with the fracturing fracture of an adjacent upper boring, sealed borehole length is 1m.
The present invention compared with prior art, due to a kind of control caving method that provides hydraulic slotted liner technique and fracturing to combine, make work plane roof form clamped, the three unconfined hanging decks in limit of rib on one side, this hanging deck, with advance of the face meeting spontaneous caving, has fundamentally been eliminated outstanding stope and the restive hidden danger of roadway surrounding rock causing of revealing of old top first weighting and top board large area.
The present invention is for the high gas layer under complicated geological, mining condition, the control caving of tight roof, has advantages of that controllability is good, is not subject to that geostatic stress affects, pollution-free, easy operating.
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.
The specific embodiment
The exemplary embodiments that embodies feature & benefits of the present invention, describes in detail in the following description in connection with accompanying drawing.Be understood that the present invention can have various variations on different embodiment, it neither departs from protection scope of the present invention, and explanation wherein and to be shown in be when the use that explain in essence, but not in order 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), always push up the limestone of 10(thickness 10m) in, after open-off cut 5 construction, before working face wall 1 not yet exploits, on the roof strata at hydraulic support 2 rears, 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, 15 ° of drilling axis direction and top board vertical line angular separations, and drilling depth 12.5m, the immediate roof 9 that 8 tops, coal seam are passed through in boring 6 arrives old top 10 and overlying rock 11 interface places (referring to Fig. 2); After interior all boring 6 constructions of open-off cut 5, before working face mining, all boring 6 is implemented to hydraulic slotted liner technique 13(referring to Fig. 3), hydraulic slotted liner technique 13 realizes by high-pressure water jet method, high-pressure water jet axially starts from 1m at the bottom of hole along boring 6, and retrusive is to the symmetrical hydraulic slotted liner technique in boring 6 both sides, and the slot degree of depth on boring 6 both sides is greater than respectively 10mm, slot width is greater than respectively 10mm, and slot is to stopping along borehole axial 1m place apart from old top 10 and immediate roof 9 interfaces are above; To the boring 6 in open-off cut 5, all adopt said process to carry out slot.After slot completes, along boring 6, axially 1m scope, immediate roof 9 at the bottom of hole are carried out to sealing of hole 12 with the above 1m scope of old top 10 interface, sealed borehole length is 1m; Then in boring 6 fracturings of interior enforcement (referring to Fig. 3), fracturing fracture 14 is to boring 6 both sides expansions.In the same manner adjacent boring 6 is implemented to a fracturing until 14 expansions of 6 fracturing fractures of adjacent boring are communicated with.To open-off cut 5, interior all boring 6 all adopts a fracturing mode to carry out pressure break, until fracturing fracture 14 is whole, 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 distances, on the roof strata in the outside, tunnel near coal column 7, the boring 6(of construction one row oblique work plane the place ahead entity coal is referring to Fig. 4 and Fig. 5); The spacing of adjacent boring is 5m, 15 ° of drilling axis direction and top board vertical line angular separations, and drilling depth 12.5m, the interface place (referring to Fig. 4 and Fig. 5) of the old rimrock layer 10 of immediate roof 9 arrival with the overlying rock 11 of 8 tops, coal seam is passed through in boring; After two crossheading internal drillings constructions, from open-off cut 5 Shang Xia end, to the boring 6 enforcement hydraulic slotted liner technique 13(in two crossheadings referring to Fig. 3), hydraulic slotted liner technique 13 realizes by high-pressure water jet method.High-pressure water jet is along holing 6 axially from 1m position at the bottom of hole, retrusive is to the symmetrical hydraulic slotted liner technique in boring 6 both sides, the slot degree of depth on boring both sides is greater than respectively 10mm, and slot width is greater than respectively 10mm, and slot is to stopping along borehole axial 1m place apart from old top 10 and immediate roof 9 interfaces are above.To the boring 6 in work plane haulage gate 5 and air return way 4, all adopt said process to carry out slot.After slot completes, until working face wall, push ahead and surpass boring 1m and boring within the scope of face end support supporting time, along borehole axial to hole at the bottom of 1m scope, immediate roof 9 carry out sealing of hole 12 with the above 1m scope of old top 10 interface; Sealed borehole length is 1m.Then in boring 6 fracturings of interior enforcement (referring to Fig. 3), fracturing fracture 14 is to the expansion of boring both sides.At work plane, push ahead when surpassing adjacent next bore position 1m and boring and being positioned at face end support supporting scope, adjacent next boring is implemented to a fracturing in the same manner, until be communicated with the fracturing fracture 14 of an adjacent upper boring.At work plane, push ahead in process, to all boring 6 in two crossheadings, all adopt a fracturing mode to carry out pressure break, until fracturing fracture 14 is whole, be communicated with.
By after above-mentioned fracturing, one side rib of work plane roof formation is clamped, the three unconfined hanging decks in limit, this hanging deck, with advance of the face spontaneous caving, has fundamentally been eliminated outstanding stope and the restive hidden danger of roadway surrounding rock causing of revealing of old top first weighting and top board large area.
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 construction, before working face wall 1 not yet exploits, on the roof strata at hydraulic support 2 rears, 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, 15 ° of drilling axis direction and top board vertical line angular separations, drilling depth 12.5m, immediate roof 9, old top sandstone layering 15, old top mud stone layering 16 and old apex stone limestone layering 17 that 8 tops, coal seam are passed through in boring, arrive overlying rock 11 and old apex stone limestone layering 17 interface places.After the interior all drilling constructions of open-off cut 5, before working face mining, all boring 6 is implemented to segmentation hydraulic slotted liner technique 13.First paragraph slot axially starts from 1m at the bottom of hole along boring 6, adopts fallback mode to flow to the symmetrical hydraulic slotted liner technique 13 of implementing in boring 6 both sides by high-pressure water shot, and slot is to stop with the above 1m of old top mud stone layering 16 interface apart from old apex stone limestone layering 17 everywhere; Second segment slot axially starts with fine sand rock stratum, the old top following 1m of 15 interface from distance old top mud stone layering 16 along boring 6, adopt fallback mode to flow to the symmetrical hydraulic slotted liner technique 13 of implementing in boring 6 both sides by high-pressure water shot, slot is to stopping with the old top packsand layering above 1m of 15 interface place apart from immediate roof 9, the slot degree of depth on boring both sides is greater than respectively 10mm, and slot width is greater than respectively 10mm.To open-off cut, 5 internal drillings all adopt said process to carry out slot.After slot completes, along boring 6, axially to implementing slot boring within the scope of the upper and lower two ends 1m of first paragraph slot, do not carry out sealing of hole 12, sealed borehole length is 1m.After sealing of hole, in first paragraph slot boring, implement fracturing, fracturing fracture 14 is expanded to boring both sides, when extension length reaches 2.5m, stops pressure break when above.Then along boring 6, axially to implementing slot boring within the scope of the upper and lower two ends 1m of second segment slot, do not carry out sealing of hole 12, sealed borehole length is 1m.After sealing of hole, in second segment slot boring, implement fracturing, fracturing fracture 14 is expanded to boring both sides, when extension length reaches 2.5m, stops pressure break when above.In identical staged fracturing mode, adjacent boring is implemented to pressure break until 14 expansions of adjacent borehole fracturing crack are communicated with.To open-off cut 5, interior all boring 6 all adopts segmentation fracturing mode to carry out pressure break, until fracturing fracture 14 is whole, 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 distances, in the outside, tunnel near coal column 7, the boring 6(of construction one row oblique work plane the place ahead entity coal is referring to Fig. 9,10).The adjacent spacing of wells is 5m, 15 ° of drilling axis direction and top board vertical line angular separations, drilling depth 12.5m, immediate roof 9, old top packsand layering 15, old top mud stone layering 16 and old apex stone limestone layering 17 that 8 tops, coal seam are passed through in boring, arrive overlying rock 11 and old apex stone limestone layering 17 interface places.After two crossheading internal drillings constructions, from open-off cut 5 Shang Xia end, to two crossheading internal drillings 6 enforcement segmentation hydraulic slotted liner technique 13(referring to Fig. 8).First paragraph slot axially starts from 1m at the bottom of hole along boring 6, to stop with the above 1m of old top mud stone layering 16 interface apart from old apex stone limestone layering 17 everywhere; Second segment slot axially starts with the following 1m of old top packsand layering 15 interface from distance old top mud stone layering 16 along boring 6, to stopping with the old top packsand layering above 1m of 15 interface place apart from immediate roof 9.Slot axially starts from 1m at the bottom of hole along boring 6, and retrusive symmetry is carried out, and the slot degree of depth on boring both sides is greater than respectively 10mm, and slot width is greater than respectively 10mm.To the boring 6 in work plane haulage gate 5 and air return way 4, all adopt said process to carry out slot.After slot completes, until working face wall, push ahead and surpass boring 1m and boring 6 within the scope of face end support supporting time, along boring 6, axially to implementing slot boring within the scope of the upper and lower two ends 1m of first paragraph slot, do not carry out sealing of hole 12, sealed borehole length is 1m.After sealing of hole, in first paragraph slot boring, implement fracturing (referring to Fig. 8), fracturing fracture 14 is expanded to boring both sides, when extension length reaches 2.5m, stops pressure break when above.Then along boring 6, axially to implementing slot boring within the scope of the upper and lower two ends 1m of second segment slot, do not carry out sealing of hole 12, sealed borehole length is 1m.After sealing of hole, in second segment slot boring, implement fracturing (referring to Fig. 8), fracturing fracture 14 is expanded to boring both sides, when extension length reaches 2.5m, stops pressure break when above.At work plane, push ahead when surpassing adjacent next bore position 1m and boring and being positioned at face end support supporting scope, adjacent next boring is implemented to segmentation fracturing in the same manner, until be communicated with the fracturing fracture 14 of an adjacent upper boring 6.At work plane, push ahead in process, to all boring 6 in two crossheadings, all adopt segmentation fracturing mode to carry out pressure break, until fracturing fracture 14 is whole, be communicated with.
By after above-mentioned fracturing, one side rib of work plane roof formation is clamped, the three unconfined hanging decks in limit, this hanging deck, with advance of the face spontaneous caving, has fundamentally been eliminated outstanding stope and the restive hidden danger of roadway surrounding rock causing of revealing of old top first weighting and top board large area.
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), always push up the limestone of 10(thickness 5m) in, the spacing of adjacent boring is 20m, 45 ° of drilling axis direction and top board vertical line angular separations, 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, 1 ° of drilling axis direction and top board vertical line angular separation, drilling depth 50m, controls the method for caving with embodiment 2.
The present invention can specifically 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 be in claim limited range explain widely, therefore fall into variation in claim or its equivalent scope and remodeling and all should be claim and contain.
Claims (8)
1. coal seam tight roof is controlled to a method for caving, being comprised: to construction drill in roof, in boring, implement fracturing, it is characterized in that: the concrete steps of described control caving method are:
1. the stage of just adopting 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 one side, to Roof Rock Strata of Coal Seam construction drill;
2. along described boring, carry out hydraulic slotted liner technique, slot direction is consistent with the trend of described open-off cut, described air return way, described haulage gate respectively;
3. after slot completes, at the two ends of described boring, carry out sealing of hole, and implement fracturing in described boring, the fracturing fracture producing in adjacent described boring is communicated with.
2. according to the method for coal seam tight roof being controlled to caving claimed in claim 1, it is characterized in that: step 1. in, for single competent bed top board, described Roof Rock Strata of Coal Seam consists of immediate roof and the hard old top of single thick-layer; For compound competent bed top board, described Roof Rock Strata of Coal Seam consists of immediate roof and old top hard by multilayer, that soft stratum layering forms.
3. according to the method for coal seam tight roof being controlled to caving claimed in claim 1, it is characterized in that: 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 the roof strata in the outside, tunnel near coal column, the boring of construction one row oblique work plane the place ahead entity coal; For single competent bed top board, the immediate roof of top, coal seam is passed through in boring, arrive old top and overlying rock interface place, for compound competent bed top board, immediate roof, the competent bed layering of old top, the soft stratum layering of old top of top, coal seam passed through in boring, arrives one deck competent bed layering border, Lao Ding the top; 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 °.
4. according to the method for coal seam tight roof being controlled to caving claimed in claim 1, it is characterized in that: 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 at the bottom of hole, start, adopt fallback mode to flow to the symmetrical hydraulic slotted liner technique of implementing in boring both sides by high-pressure water shot; 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, adopts fallback mode to flow to the symmetrical hydraulic slotted liner technique of implementing in boring both sides in air return way and haulage gate by high-pressure water shot; Slot is to stopping along borehole axial 1m place apart from old top and immediate roof interface are above, and the slot degree of depth on boring both sides is greater than respectively 10mm, and slot width is greater than respectively 10mm.
5. according to the method for coal seam tight roof being controlled to caving claimed in claim 1, it is characterized in that: step 2. in, for compound competent bed top board, to always 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, all boring is implemented to segmentation hydraulic slotted liner technique, in each old top competent bed layering, implement hydraulic slotted liner technique, first paragraph slot starts along 1m place, competent bed layering border, the old top of the borehole axial Cong Ju the superiors, adopt fallback mode to flow to the symmetrical hydraulic slotted liner technique of implementing in boring both sides by high-pressure water shot, the above 1m of old top competent bed lower limits of Zhi Ju the superiors place 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 respectively 10mm, and slot width is greater than respectively 10mm.
6. according to the method for coal seam tight roof being controlled to caving claimed in claim 1, it is characterized in that: step 3. in, for single competent bed top board, described sealing of hole be along the borehole axial in open-off cut to hole at the bottom of 1m scope, the above 1m scope of immediate roof and old topcross interface carry out sealing of hole; Described sealing of hole is to push ahead and surpass boring 1m and boring within the scope of face end support supporting time until working face wall, along the borehole axial in work plane haulage gate and air return way to hole at the bottom of 1m scope, the above 1m scope of immediate roof and old topcross interface carry out sealing of hole; Described sealed borehole length is 1m.
7. according to the method for coal seam tight roof being controlled to caving claimed in claim 1, it is characterized in that: step 3. in, for single competent bed top board, in described boring, implement fracturing, to implementing a fracturing in all boring of open-off cut, fracturing fracture, to the expansion of boring both sides, is communicated with until fracturing fracture is whole; In described boring, implement fracturing, that work plane haulage gate and air return way internal drilling are implemented to a fracturing, a fracturing is at work plane, to push ahead to surpass when adjacent next bore position 1m and boring are positioned at face end support supporting scope to carry out, adjacent next boring is implemented to a fracturing in the same manner, until be communicated with the fracturing fracture of an adjacent upper boring; At work plane, push ahead in process, to all boring in haulage gate and air return way, all adopt a fracturing mode to carry out pressure break, until fracturing fracture is whole, be communicated with.
8. according to the method for coal seam tight roof being controlled to caving claimed in claim 1, it is characterized in that: step 3. in, for compound competent bed top board, described sealing of hole is to implementing slot boring within the scope of the upper and lower two ends 1m of first paragraph slot, not carry out sealing of hole along borehole axial, after sealing of hole, in the boring of first paragraph slot, implement fracturing, fracturing fracture is to the expansion of boring both sides, when reaching adjacent drilling hole, extension length stops pressure break when over half, then along borehole axial, upper and lower two ends 1m scope in the competent bed layering of the old top of second segment is not implemented to slot boring and carry out sealing of hole, in the boring of second segment slot, implement fracturing, fracturing fracture is to the expansion of boring both sides, when reaching adjacent drilling hole, extension length stops pressure break when over half, with identical sealing of hole and fracturing mode, other section old top competent bed layering in holing is implemented to fracturing, in identical staged fracturing mode, adjacent boring is implemented to pressure break, 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 is whole, be communicated with, to the drilling and sealing in work plane haulage gate and air return way, to treat that working face wall is pushed ahead to surpass boring 1m, and while holing within the scope of face end support supporting, along borehole axial, to implementing the boring of slot within the scope of the upper and lower two ends 1m of first paragraph slot, do not carry out sealing of hole, after sealing of hole, in the boring of first paragraph slot, implement fracturing, when reaching adjacent drilling hole, fracturing fracture extension length stops pressure break when over half, then along borehole axial, to implementing the boring of slot within the scope of the upper and lower two ends 1m of second segment slot, do not carry out sealing of hole, after sealing of hole, in the boring of second segment slot, implement fracturing, when reaching adjacent drilling hole, fracturing fracture extension length stops pressure break when over half, with identical sealing of hole and fracturing mode, other section old top competent bed layering in holing is implemented to fracturing, at work plane, push ahead and surpass adjacent next bore position 1m, and when boring is positioned at face end support supporting scope, adjacent next boring is implemented to segmentation fracturing in the same manner, until be communicated with the fracturing fracture of an adjacent upper boring, sealed borehole length is 1m.
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