CN101122235A - Method for controlling wall rock of fully mechanized coal face goaf side coalbed laneway - Google Patents
Method for controlling wall rock of fully mechanized coal face goaf side coalbed laneway Download PDFInfo
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- CN101122235A CN101122235A CNA2007100238005A CN200710023800A CN101122235A CN 101122235 A CN101122235 A CN 101122235A CN A2007100238005 A CNA2007100238005 A CN A2007100238005A CN 200710023800 A CN200710023800 A CN 200710023800A CN 101122235 A CN101122235 A CN 101122235A
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Abstract
The invention is a method to control a wall rock in a side coal seam laneway in a goaf of a fully mechanized caving face. Based on the geology data of the fully mechanized caving face, which is measured at site, and the mine pressure data of a neighboring working face, exploitation of which is completed, stability of a large structure of a cover rock on the laneway is analyzed and width of a narrow coal pillar preset in at the side of the goaf is determined to make the laneway located in an area, where the coal vertical stress is relatively low, and a high-performance anchor support controlling the laneway wall rock makes the wall rock form a small loading structure in the anchor fixing area. The small structure makes full use of the self-loading capability of the wall rock, and is easily adaptable to the wall rock deformation to ensure the laneway support is smooth and is not returned for repair. The anchor support is provided with the low cost, the high speed and the low labor intensity. Compared with the manner of laneway protection by large coal pillars, the manner of laneway protection by the small coal pillars reduces the loss of coal resources, promotes the recovery rate of fully-mechanized mining, and is provided with the favorable economic and social benefits.
Description
Technical field
The present invention relates to a kind of method of heading surrounding rock stability control, be applicable to the control of fully mechanized coal face along goaf side heading surrounding rock stability.
Background technology
The mining production technique has become the important technical of China's coal-mine high-yield and high-efficiency and the important development direction of coal mining technology at present.Combine the fundamental research of putting the stope Surrounding Rock Control and obtained very big achievement, but the research of comprehensive coal face goaf side stability of the roadway control is less, become restriction and combine the principal element that discharge technique further develops.For a long time, mainly adopt big coal column (about about 30m) to protect the lane mode for fully mechanized coal face goaf side heading, but big coal column protects the rate of recovery that the lane has reduced longwall top coal caving, cause the significant wastage of coal resources, the recovery utilization rate that how to improve this non-renewable resources becomes the problem that the whole industry is paid close attention to.Combine and to put back to the supporting of adopting the tunnel, especially adopting sky side gob side entry driving and adopt support patterns such as log hut, metallic support more, the report that adopts bolt support is also arranged, but cost height in application, supporting effect is poor, roadway deformation is serious, and the exploitation that influences fully mechanized coal face has hindered to combine puts giving full play to of capacity of equipment.
Summary of the invention
The object of the present invention is to provide a kind of minimizing coal resources waste, improve the longwall top coal caving rate of recovery, reduce roadway support longwall top coal caving is limited, the country rock method of utilizing size structure control fully mechanized coal face goaf side coalbed laneway that supporting effect is good.
Technology contents of the present invention is as follows:
A. press data according to the geologic data and the adjacent work plane ore deposit that finishes of having exploited of field measurement comprehensive coal face, determine the parameter value of crucial piece, the stability of crucial piece in the overlying strata body macrostructure on the analysis tunnel;
B. according to the value of the parameter of crucial piece, make the tunnel be arranged in the relatively low zone of coal body vertical stress under the overlying strata body macrostructure, according to coal mine roadway rocvk classification, under medium stable wall rock condition, reserving narrow coal pillar width is 3.5～5m;
C. according to reserving narrow coal pillar width along the goaf side digging laneway, adopt the left-handed nothing of high performance 20MnSi to indulge the supporting of muscle twisted steel anchor rod, resin explosive roll is selected in the anchoring agent of anchor pole for use; Wherein full length fastening is adopted in the anchoring of roofbolt, and two help the anchoring of anchor pole to adopt the lengthening anchoring; Bolt pretension is controlled at 20～30kN; In anchor rod anchored scope, form the roadway surrounding rock minor structure.
The matching used convex supporting plate of described bolt support employing and anchor pole, antifriction packing ring, quick mounting nut, wire lath, steel band and reinforcing bar ladder; The rock-bolt length of described bolt support is 2.0～2.5m, and diameter is Φ 20～Φ 22mm, and the bore diameter that is complementary with bolt diameter is Φ 28mm; Described anchor rod anchored resin explosive roll diameter is Φ 23mm～Φ 25mm; The length of its lengthening anchoring is 1～1.5m.
Beneficial effect of the present invention: by analyzing to covering the disrumpent feelings form of old rimrock layer on the fully mechanized coal face goaf side, determine formed macrostructure in rock stratum and crucial piece stability thereof, can reserve narrow coal pillar width under crucial piece is 3.5～5m place digging laneway, protecting the lane mode with big coal column (about 30m) compares, significantly reduce the waste of coal resources, improved the rate of recovery of longwall top coal caving.3.5 just in time being in the vertical stress that forms in the coal body, reduces in the district～5m place digging laneway, be convenient to the maintenance in tunnel, adopt the high-performance bolt support to make the roadway surrounding rock of control form the bearing structure of an integral body, what make full use of country rock self holds ability, outside country rock had compliance, the assurance tunnel safety uses, the normal exploitation of work plane; Compare with the metallic support supporting and to have reduced the roadway support cost, improved the driving work efficiency, alleviated labor strength, have good economic and social benefit.
Description of drawings
Fig. 1 is an overlying strata body macrostructure generalized section on the fully mechanized coal face goaf side heading of the present invention.
Fig. 2 is fully mechanized coal face goaf side heading of the present invention and last overlying strata body macrostructure floor map.
Fig. 3 is a roadway bolt supporting and protection structure schematic diagram of the present invention.
Among the figure: the crucial piece of 1-, the last overlying strata body of 2-macrostructure, 3-fully mechanized coal face, 4-comprehensive coal face are along the goaf side heading, and 5-reserves narrow coal column, the adjacent work plane that finishes of having exploited of 6-, the left-handed nothing of 7-is indulged the muscle twisted steel anchor rod; L
1-narrow coal pillar width, L
2The fracture position of the rock stratum of-macrostructure 2 in coal body is apart from adjacent distance of having exploited the work plane that finishes, L
3-side direction fracture span, L
4-crucial piece is along the length of advance of the face direction, L
5-fully mechanized coal face length, L
6-roofbolt spacing, L
7-narrow coal column is helped anchor pole spacing, L
8-entity coal group anchor pole spacing, α-top, anchor pole angle of inclination, base angle.
The specific embodiment
Below in conjunction with accompanying drawing embodiments of the invention are further described:
The country rock method of control fully mechanized coal face goaf side coalbed laneway of the present invention is as follows:
One, goes up the stability analysis of overlying strata body macrostructure
1. be example with certain colliery, press data, know that tunnel 4 average buried depths are 500m according to this colliery actual measurement fully mechanized coal face geologic information and adjacent ore deposit of having exploited the work plane that finishes, the average thick 8.28m of coal, seam inclination is 3～7 °, and the coal bed joints cranny development belongs to the weak broken coal seam.The cohesion in coal seam is 2.2Mpa, and angle of internal friction is 20 °, and density is 1.5g/cm
3The top in coal seam, place is followed successively by the thick middle sandstone of 0.2m thick grey mud stone, 2.06m thick grey black siltstone, 22.02m etc. from lower to upper.The length L of fully mechanized coal face 3
6Be 180m, adjacent old top periodic weighting step pitch of having exploited the work plane 6 that finishes is 16m.
2. according to the sheaf theoretic basic principle of known key, rock stratum in the above-mentioned data is thick in the middle sandstone of 22.02m is defined as macrostructure 2, shown in Figure 1, the zone that plays a major role in the stability of macrostructure 2 is crucial piece 1, and the basic parameter of crucial piece 1 is determined as follows:
Shown in Figure 2, crucial piece 1 is along the length L of advance of the face direction
4Step pitch during with old top periodic weighting is identical, is 16m.
The side direction fracture span L of crucial piece 1
3, the yield line method law theory design formulas of employing plate
The fracture position of the rock stratum of macrostructure 2 in coal body is L apart from adjacent distance of having exploited the work plane that finishes
2, under the condition of the medium stable rock stratum on this pit coal layer top, draw L by numerical simulation calculation
2=6.5m.
3. an end of crucial piece 1 touches cash in the work plane 6 that finishes and is subjected to supporting role adjacent the exploitation, is subjected to adopting the support of sky lateral edges coal body in comprehensive coal face 3, the side direction fracture span L of crucial piece 1
3Be that fracture position is apart from adjacent distance L of having exploited the work plane that finishes
2Twice many, thereby crucial piece 1 horizontal thrust and the frictional force effect that are subjected to adjacent block a and b and provide simultaneously forms articulated structure, so crucial piece 1 is stable, promptly macrostructure 2 is stable, this just provides assurance to the reservation supporting roadway with narrow coal pillar.
Two, the location arrangements in tunnel
Parameter L according to above-mentioned crucial piece 1
2=6.5m, tunnel 4 is arranged in the 6.5m scope, because destruction is to a certain degree taken place for the coal body of this scope, its intensity reduces, so tunnel 4 is arranged in this zone, suffered vertical stress is less, is convenient to the maintenance in tunnel.
Coal body between the work plane 6 that tunnel 4 and mining of adjacent finish is for reserving narrow coal column 5, its width L
1By the limit equilibrium theory formula:
L
1＝x
1+x
2+x
3
In the formula: x
1The fracture area width value in close goaf in the-narrow coal column;
x
2The narrow coal column one side anchor bar effective length value in-tunnel;
x
3The coal column stability coefficient of-coal seam thickness is by 0.2 (x
1+ x
2) calculate;
M-adopts in the coal seam thick; The A-coefficient of horizontal pressure; μ is a poisson's ratio; φ
0The angle of internal friction of-coal seam interface; C
0The cohesion of-coal seam interface; The k-factor of stress concentration; The average unit weight in γ-rock stratum; H-tunnel buried depth; P
x-to the supporting resistance of coal group.
Calculate L
1Be 4.3m.
Three, the driving in tunnel and supporting
According to the width L that reserves narrow coal column 5
1Be 4.3m, along goaf side driving rectangular shaped roadways 4, shown in Figure 3, the width in tunnel 4 is 3.7m, is 3.0m highly, adopts high performance anchor pole to carry out supporting.The vertical muscle twisted steel anchor rod 7 of the left-handed nothing of 20MnSi that 3 specifications of installation are Φ 20 * 2200mm in the middle of back; The vertical muscle twisted steel anchor rod 7 of the left-handed nothing of 20MnSi that two jiaos are installed 2 specifications is Φ 20 * 2500mm, the anchor pole inclined angle alpha is 30 °; Every anchor pole is with 2 of 1 of CK2350 resin explosive roll and Z2350 resin explosive rolls, and ultrafast type resin explosive roll is placed on the boring end, and anchorage style is a full length fastening; Anchor pole spacing L
6Be 800mm, lay diamond mesh and W steel band.
4 liang of vertical muscle twisted steel anchor rods 7 of the left-handed nothing of 20MnSi that Φ 20 * 2200mm installs in group in the tunnel, wherein coal column group is 5, spacing L
7Be 650mm; 4 in entity coal group, spacing L
8Be 800mm; Anchor pole near back or base plate is in tilted layout, and inclined angle alpha is 30 °; Every anchor pole uses 2 Z2350 resin explosive rolls, and two help to be the lengthening anchorage style, and anchorage length is 1.4m; The wire lath that adopts the 10# iron wire to be made, and reserving the reinforcing bar ladder that narrow coal column side increase Φ 14mm reinforcing bar is made.
The boring aperture of above-mentioned anchor pole 7 is Φ 28mm; The annex of anchor pole 7 comprises convex supporting plate, antifriction packing ring, quick mounting nut; Pretightning force during skyhook 7 is controlled at 20～30kN.
Because high performance bolt support is adopted in tunnel 4, in anchor pole 7 anchoring scopes, form the roadway surrounding rock minor structure, minor structure can fully improve the self-bearing capacity of country rock, outside surrouding rock deformation had compliance, thereby suppress revolution, the sinking of macrostructure 2 during tunnel 4 drivings and working face extraction effectively, guarantee the stable of macrostructure 2.
Claims (4)
1. method of controlling the fully mechanized coal face goaf side coalbed laneway country rock is characterized in that:
A. press data according to the geologic data and the adjacent work plane ore deposit that finishes of having exploited of field measurement comprehensive coal face, determine the parameter (L of crucial piece (1)
2, L
3) value, analyze on the tunnel stability of crucial piece (1) in the overlying strata body macrostructure (2);
B. according to the parameter (L of crucial piece (1)
2) value, make the tunnel be arranged in the relatively low zone of coal body vertical stress under the overlying strata body macrostructure (2), according to coal mine roadway rocvk classification, under medium stable wall rock condition, the reservation coal pillar width is 3.5～5m;
C. according to reserving coal pillar width along goaf side digging laneway (4), adopt the left-handed nothing of high performance 20MnSi to indulge the supporting of muscle twisted steel anchor rod, resin explosive roll is selected in the anchoring agent of anchor pole for use; Full length fastening is adopted in the anchoring of roofbolt in the bolt support (7), and two help the anchoring of anchor pole (7) to adopt the lengthening anchoring; Bolt pretension is controlled at 20～30kN; In anchor rod anchored scope, form the roadway surrounding rock minor structure.
2. the method for control fully mechanized coal face goaf side coalbed laneway country rock according to claim 1 is characterized in that: described bolt support employing and the matching used convex supporting plate of anchor pole (7), antifriction packing ring, quick mounting nut, wire lath, steel band and reinforcing bar ladder.
3. the method for control fully mechanized coal face goaf side coalbed laneway country rock according to claim 1, it is characterized in that: the anchor pole of described bolt support (7) length is 2.0～2.5m, diameter is Φ 20～Φ 22mm, and the bore diameter that is complementary with anchor pole (7) diameter is Φ 28mm.
4. the method for control fully mechanized coal face goaf side coalbed laneway country rock according to claim 1 is characterized in that: described anchor rod anchored resin explosive roll diameter is Φ 23mm～Φ 25mm; The length of its lengthening anchoring is 1～1.5m.
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| CN200710023800A CN101122235B (en) | 2007-10-31 | 2007-10-31 | Method for controlling wall rock of fully mechanized coal face goaf side coalbed laneway |
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