CN101922292B - Coal mine gob-side entry retaining roadside segment bearing unequal strength support principle and application - Google Patents
Coal mine gob-side entry retaining roadside segment bearing unequal strength support principle and application Download PDFInfo
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- CN101922292B CN101922292B CN2010101056097A CN201010105609A CN101922292B CN 101922292 B CN101922292 B CN 101922292B CN 2010101056097 A CN2010101056097 A CN 2010101056097A CN 201010105609 A CN201010105609 A CN 201010105609A CN 101922292 B CN101922292 B CN 101922292B
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Abstract
The invention discloses a support principle which is suitable for coal mine gob-side entry retaining segment bearing roadside support and an application method. After a working surface begins to be exploited, a transport road adopts gob-side entry retaining which is completely preserved to be used as a return airway for the next working surface. According to characteristics of stratum movement, the segment bearing principle is put forward to carry out the roadside unequal strength support. The roadside unequal strength support is that bearing-deformation of a roadside support material carries out support of different strengths according to the segment movement intensity of the stratum in order to adapt to movement characteristics in different phases, namely different stratum movement phases, and correspondingly, the roadside support material has different mechanical properties and bearing-deformation parameters. Roadway support of the transport road is combined support by upper-layer padding and lower-layer padding. The whole padding combination body has not only large deformation amount but also high bearing strength, thus achieving double effects of support and sealing. The coal mine gob-side entry retaining roadside segment bearing unequal strength support principle and the application method are suitable for coal mine underground gob-side entry retaining roadside support.
Description
Technical field
The application relates to that the segmentation of gob side entry retaining roadside support does not wait strong supporting principle and application process under the coal mine.
Background technology
Gob side entry retaining under the coal mine (as shown in Figure 1) is meant complete the remaining in transportation lane of coal-face, leaves next coal-face for and does return airway.
Gob side entry retaining belongs to the large deformation country rock, bears driving and adopts (this working face mining and next working face mining) stress influence for twice, and the ore deposit is pressed and manifested acutely, is a complicated system engineering.Stay the lane to get nowhere, be difficult to the main cause of wide popularization and application: the one, for want of theoretic accurate instruction when gob-side entry retaining support designs, thinks that safety factor is high more good more, causes unnecessary economic loss; The 2nd, when gob side entry retaining designs, often select the unreasonable lane failure that causes staying because of supporting in the lane and roadside support parameter, influence ordinary production and safety of coal mines, and cause great economic loss; The 3rd, construction material, technology, equipment fall behind, and efficient is low, and labour intensity is big.Therefore; Further investigation gob side entry retaining Surrounding Rock Control mechanism; Grasp residing ambient stress of gob side entry retaining and ore deposit thereof pressure and manifest rule, make up Deep Mine gob side entry retaining stress model, sophistication and material; Forming the effective gob-side entry retaining support countermeasure of a cover, is the only way that the gob side entry retaining engineering can be successful.To above-mentioned analysis, should study and be suitable for gob side entry retaining roadside support mechanism and application process.
Summary of the invention
The application's purpose is a kind of coal mine gob-side entry retaining segment bearing roadside support mechanism and application process of being suitable for of invention.The application's technical scheme is: after work plane began exploitation, gob side entry retaining, the complete return airway that remains as next work plane were adopted in the transportation lane.According to characteristics of stratum movement, the segment bearing principle is proposed, carry out the side, lane and do not wait strong supporting.The segment bearing principle is meant that the formation of longwell stope work plane rock movement structure and motion thereof are to be accomplished by twice mining influence stage by stage; The lane is other does not wait strong supporting to be meant that the load metamorphism of roadside support material is according to rock stratum segment movement earthquake intensity; For the movement characteristic that adapts to different phase carries out the supporting of varying strength; Be the different rock movement stages, it is corresponding with it that the roadside support material has different mechanical performance, load metamorphism parameter.Transportation lane roadside support is divided into two-layer filler combination supporting up and down.When selecting material property with technology, technical needs satisfy the requirement of " live, protect to such an extent that live, seal to such an extent that live ", and it is corresponding with it that material property has the characteristics of " just, soften, swollen ".Top board is adopted " given deformation " programme of work, and promptly prop is only born the active force that direct top sinks, the direct top here refers on the coal seam, certain intensity is arranged, and can be with the prop drawing caving rock stratum of inbreak.Upper layer of material adopts the filler (deformation rate 10～50%) that intensity is lower, deflection is big, can realize to top board let pressures in early days, the while can effectively guarantee in time to seal the goaf; Subsurface material adopts the higher filler of intensity, can guarantee to bear the load action power on direct top after the top board dynamic pressure, and not destroy.When upper strata filler distortion 50% is above; Lower floor's filler does not but have stressed; Top comes power all lax by the large deformation of upper strata filler; And be not passed to the filler of lower floor, thus realize that whole filling assembly promptly has bigger deflection that higher bearing strength is arranged again, reach supporting and sealing double effects.
Coal mine gob-side entry retaining roadside segment bearing unequal strength support principle of the present invention and application process are applicable to gob side entry retaining roadside support under the coal mine.
Coal mine gob-side entry retaining roadside segment bearing unequal strength support method construction sequence of the present invention is following:
1, set prestress anchorage cable (12) on the old top (1) and the direct top (2) of Liu Xiang tunnel (3), stablize the rock stratum supporting capacity to transfer the deep, (4) 0.5m, array pitch 2m are helped in anchor cable (12) position on distance.Set the vertical old top of angle (1) and directly push up (2), 5 ° of downward biases, the supporting capacity of prestress anchorage cable (12) and length are determined by the top board lithology.
2, on distance group (4) 0.5m, 1.0m each make a call to two hydraulic props (5) align reaming and connect back timber (6) supporting, hydraulic prop (5) contacts firmly with base plate (7).Hydraulic prop (5) has enough setting loads, and working resistance is not less than 250KN, and hydraulic prop (5) lives that post has more than the 400mm can the amount of contracting, so that control the deflection of top board effectively, the retention time of hydraulic prop (5) generally is advisable with 28d.After the concrete time need pass through observation, confirm to treat stability of cavern roof after tilted forward beat.
3, (4) 1.7m of group mends the plate anchor pole (11) of pinching on distance,, prevent filling side roof collapse, return afterwards and remove hydraulic prop (5) and articulated roof beam (6);
4, estimate according to rock stratum (old top (1) and direct top (the 2)) characteristics of motion; Expectation is adopted the deflection of old top (10) contact spoils (8) for the first time and is adopted the deflection that old top (9) contacts spoil (8) with the second time, confirms thickness, the intensity of thickness, intensity and lower floor's supporting (14) of the upper strata supporting (13) of roadside support;
5, the width of upper strata obturation (13) and lower floor's obturation (14) is generally with the institute extracting seam thickness and equates, concrete width is according to cutting top calculation of resistance decision;
6, arrange lower floor's filling bag (17); Guarantee that lower floor's filling bag (17) laying puts in place; Lower floor's filling bag (17) can be full of the space body of the filling of wanting and do not pushed down by material (14) when guaranteeing subsurface material (14) filling, guarantees that the drift angle of lower floor's filling bag (17) can be by subsurface material (14) filling;
7, arrange upper strata filling bag (16); Guarantee that upper strata filling bag (16) laying puts in place; Upper strata filling bag (16) can be full of the space body of the filling of wanting and do not pushed down by upper layer of material (13) when guaranteeing upper layer of material (13) filling, guarantees that the drift angle of upper strata filling bag (16) can be got up to contact top board (2) by upper layer of material (13) filling;
8, for will closely connecting together between upper strata filling bag (16) and the lower floor's filling bag (17); Guarantee that upper strata filling bag (16) and lower floor's filling bag (17) are full of tight between subsurface material (14) and upper layer of material (13) back, compacting is tight; Mould netting (15) with up and down two-layer filler encirclement with long, strengthen the stable type and the bulk strength of obturation;
9, filling operation: adopt the filling pump, and guarantee slip casting effect in strict accordance with operating instruction.
Description of drawings
Fig. 1 is a gob side entry retaining sketch map under the coal mine; Fig. 2, Fig. 3 are the application's the sequence of construction first step and the second step sketch mapes;
Marginal data: 1-pushes up always, and 2-directly pushes up, 3-tunnel, the last group of 4-, 5-hydraulic prop; 6-articulated roof beam, 7-base plate, 8-spoil, 9-are adopted old top for the second time; 10-adopts old top, 11-anchor pole, 12-prestress anchorage cable, 13-upper strata filler for the first time; 14-lower floor filler, 15-is long to mould netting, 16-upper strata filling bag, 17-lower floor filling bag.
The specific embodiment
1, set prestress anchorage cable (12) on the old top (1) and the direct top (2) of Liu Xiang tunnel (3), stablize the rock stratum supporting capacity to transfer the deep, (4) 0.5m, array pitch 2m are helped in anchor cable (12) position on distance.Set the vertical old top of angle (1) and directly push up (2), 5 ° of downward biases, the supporting capacity of prestress anchorage cable (12) and length are determined by the top board lithology.
2, on distance group (4) 0.5m, 1.0m each make a call to two hydraulic props (5) align reaming and connect back timber (6) supporting, hydraulic prop (5) contacts firmly with base plate (7).Hydraulic prop (5) has enough setting loads, and working resistance is not less than 250KN, and hydraulic prop (5) lives that post has more than the 400mm can the amount of contracting, so that control the deflection of top board effectively, the retention time of hydraulic prop (5) generally is advisable with 28d.After the concrete time need pass through observation, confirm to treat stability of cavern roof after tilted forward beat.
3, (4) 1.7m of group mends the plate anchor pole (11) of pinching on distance,, prevent filling side roof collapse, return afterwards and remove hydraulic prop (5) and articulated roof beam (6);
4, estimate according to rock stratum (old top (1) and direct top (the 2)) characteristics of motion; Expectation is adopted the deflection of old top (10) contact spoils (8) for the first time and is adopted the deflection that old top (9) contacts spoil (8) with the second time, confirms thickness, the intensity of thickness, intensity and lower floor's supporting (14) of the upper strata supporting (13) of roadside support;
5, the width of upper strata obturation (13) and lower floor's obturation (14) is generally with the institute extracting seam thickness and equates, concrete width is according to cutting top calculation of resistance decision;
6, arrange lower floor's filling bag (17); Guarantee that lower floor's filling bag (17) laying puts in place; Lower floor's filling bag (17) can be full of the space body of the filling of wanting and do not pushed down by material (14) when guaranteeing subsurface material (14) filling, guarantees that the drift angle of lower floor's filling bag (17) can be by subsurface material (14) filling;
7, arrange upper strata filling bag (16); Guarantee that upper strata filling bag (16) laying puts in place; Upper strata filling bag (16) can be full of the space body of the filling of wanting and do not pushed down by upper layer of material (13) when guaranteeing upper layer of material (13) filling, guarantees that the drift angle of upper strata filling bag (16) can be got up to contact top board (2) by upper layer of material (13) filling;
8, for will closely connecting together between upper strata filling bag (16) and the lower floor's filling bag (17); Guarantee that upper strata filling bag (16) and lower floor's filling bag (17) are full of tight between subsurface material (14) and upper layer of material (13) back, compacting is tight; Mould netting (15) with up and down two-layer filler encirclement with long, strengthen the stable type and the bulk strength of obturation;
9, filling operation: adopt the filling pump, and guarantee slip casting effect in strict accordance with operating instruction.
Claims (1)
1. coal mine gob-side entry retaining roadside segment bearing unequal strength support method, step is following:
Step 1, the old top (1) of Liu Xiang tunnel (3) and directly top (2) set prestress anchorage cable (12), stablize the rock stratum supporting capacity to transfer the deep, (4) 0.5m, array pitch 2m are helped in prestress anchorage cable (12) position on distance; Set the vertical old top of angle (1) and directly push up (2), downward bias 5o, the supporting capacity of prestress anchorage cable (12) and length are determined by the top board lithology;
Step 2, on distance group (4) 0.5m, 1.0m each make a call to two hydraulic props (5) align reaming and connect back timber (6) supporting, hydraulic prop (5) contacts firmly with base plate (7); Hydraulic prop (5) has enough setting loads; Working resistance is not less than 250KN; Hydraulic prop (5) lives that post has more than the 400mm can the amount of contracting, so that control the deflection of top board effectively, the retention time of hydraulic prop (5) generally is advisable with 28d; After the concrete time need pass through observation, confirm to treat stability of cavern roof after tilted forward beat;
Step 3, (4) 1.7m of group mends the plate anchor pole (11) of pinching on distance, prevents filling side roof collapse, returns afterwards and removes hydraulic prop (5) and articulated roof beam (6);
Step 4, estimate according to the rock movement rule; Expectation is adopted the deflection of old top (10) contact spoils (8) for the first time and is adopted the deflection that old top (9) contacts spoil (8) with the second time, confirms thickness, the intensity of thickness, intensity and lower floor's supporting (14) of the upper strata supporting (13) of roadside support;
The width of step 5, upper strata supporting (13) and lower floor's supporting (14) is generally with the institute extracting seam thickness and equates, concrete width is according to cutting top calculation of resistance decision;
Step 6, layout lower floor's filling bag (17); Guarantee that lower floor's filling bag (17) laying puts in place; Lower floor's filling bag (17) can be full of the space body of the filling of wanting and do not pushed down by lower floor's supporting (14) when guaranteeing lower floor's supporting (14) filling, guarantees that the drift angle of lower floor's filling bag (17) can be by lower floor's supporting (14) filling;
Step 7, layout upper strata filling bag (16); Guarantee that upper strata filling bag (16) laying puts in place; Upper strata filling bag (16) can be full of the space body of the filling of wanting and do not pushed down by upper strata supporting (13) when guaranteeing upper strata supporting (13) filling, guarantees that the drift angle of upper strata filling bag (16) can be got up to contact top board (2) by upper strata supporting (13) filling;
Step 8, for will closely connecting together between upper strata filling bag (16) and the lower floor's filling bag (17); Guarantee that upper strata filling bag (16) and lower floor's filling bag (17) are full of tight between lower floor's supporting (14) and upper strata supporting (13) back, compacting is tight; Mould netting (15) with upper strata supporting (13) and lower floor's supporting (14) encirclement with long, strengthen the stability and the bulk strength of obturation;
Step 9, filling operation: adopt the filling pump, and guarantee slip casting effect in strict accordance with operating instruction.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101056097A CN101922292B (en) | 2010-02-04 | 2010-02-04 | Coal mine gob-side entry retaining roadside segment bearing unequal strength support principle and application |
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| CN2010101056097A CN101922292B (en) | 2010-02-04 | 2010-02-04 | Coal mine gob-side entry retaining roadside segment bearing unequal strength support principle and application |
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| CN101922292B true CN101922292B (en) | 2012-11-07 |
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| CN102146797B (en) * | 2011-01-21 | 2012-12-12 | 中国矿业大学 | Short-section temporary gob-side entry retaining method |
| CN102678173B (en) * | 2012-05-12 | 2014-07-02 | 山东科技大学 | High-strength leakproof packing structure of gob-side entry retaining roadside and construction method thereof |
| CN102720498B (en) * | 2012-06-20 | 2015-06-17 | 鄂托克前旗长城煤矿有限责任公司 | Gob-side entry retaining mining process for coal face |
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| CN108825236B (en) * | 2018-05-28 | 2019-09-27 | 西安科技大学 | A kind of shallow embedding coal seam group near interval roof periodic presses Support Resistance to determine method |
| CN109403973A (en) * | 2018-09-26 | 2019-03-01 | 四川省煤炭产业集团有限责任公司 | A kind of flexible type shield gob-side entry retaining method |
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