A long route type goaf paste filling one-time roof contact method

Abstract

The application provides a long-inlet goaf paste body filling one-time roof-contacting method, and belongs to the technical field of mining. The method leads a filling main pipe from a paste body conveying pipe network to a filling stope, the filling main pipe is connected with a three-way ball valve, one end of the three-way ball valve is connected with a sewage pipe, and the other end is connected with a pressure gauge and a matched connecting pipe fitting; the pressure gauge is connected with another three-way ball valve, one end of the three-way ball valve is connected with an end part discharging pipe, and the other end is connected with another three-way ball valve, one end of the three-way ball valve is connected with a middle part discharging pipe, and the other end is connected with a tail part discharging pipe. The application optimizes the arrangement of discharging points, fully utilizes the paste body expansion distance, and makes the slurry of each discharging point fill the deposition slope surface of each other, so that the paste body flowability is overcome, the roof-contacting rate is improved, the filling pipe network pressure change is recorded in real time, the stope filling condition is mastered, the filling quality is ensured, the one-time forced roof-contacting purpose is achieved, the operation accidents caused by pipe blocking and excessive stope filling are effectively avoided, and the safe and efficient filling is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mining, in particular to a long advance type goaf paste filling one-time roof contact method. BACKGROUND

[0002] The filling method is a kind of mining method suitable for mining under complex ore rock conditions. The goaf is filled in time to control ground pressure, ensure production safety, and minimize mining dilution loss rate and consume part of mine solid waste. The key to ground pressure control by filling method is the constraint and effective bearing of the filling body on the boundary rock mass. The filling body exerts motion constraint on the displacement of the key block of the stope boundary, plays a passive resistance role, and thus reduces the stress concentration in the mining space. Therefore, the filling rate of the goaf determines the effect of ground pressure control, and ensuring filling roof contact is the focus of filling mining.

[0003] The filling of long advance type goaf requires good stability and fluidity of the slurry due to the constraint of its narrow space characteristics (length-width ratio ≥ 10, length > 40 m). The concentration of traditional cemented filling is low, and the slurry diffuses and flows in the narrow stope. In the process of slow diffusion, the slurry gradually stratifies, separates, and dehydrates, which easily leads to aggregate accumulation and the formation of an accumulation slope, affecting the roof contact quality. Therefore, for traditional cemented slurry, the roof contact rate is often improved by multiple filling and multiple dehydration operations, but this method has low filling efficiency, and multiple dehydration will lead to cement loss, stratification of the filling body, and reduction of the overall strength of the filling body. The disclosed technical solution provides an artificial overflow groove by damaging the roof or pre-burying components in the false roof to provide operating conditions for forced roof contact, but this technical solution damages the integrity of the long advance roof, forming a stress concentration area and leaving a safety hazard for stope operation.

[0004] Paste filling has the characteristics of no bleeding, no separation, no stratification, and high integrity of the filling body. Reasonable material proportioning and the addition of admixtures can improve the fluidity of the paste, but the self-flow diffusion distance is still limited, and there is a certain self-flow deposition slope (generally 1°-3°), which has a certain influence on the filling roof contact. The paste is filled into the stope by means of pressurized pumping. To ensure good fluidity of the slurry at the outlet of the pipeline, the paste at the discharge outlet often has a certain discharge pressure. Ensuring a certain discharge pressure can increase the diffusion distance of the paste and improve the filling roof contact rate.

[0005] The paste has thixotropic properties, and the paste flow needs to overcome a certain size of yield stress, and the yield stress to be overcome by the paste flow again after the paste is at rest for a period of time will increase, and the yield stress decreases and stabilizes at a certain value with the occurrence and maintenance of flow shear. The filling of the long entry type stope usually arranges the discharge port of the filling pipe at the end of the entry, and during the filling process, the paste will be gradually extruded and diffused from the end to the end of the retaining wall along the entry wall, and with the accumulation of the slurry, the liquid level will gradually rise until the top is filled with the entire stope. The paste gradually reaches the top from the end of the entry to the end of the retaining wall, and the paste that reaches the top first will be deposited and wrapped around the discharge port, and with the advancement of the top, the paste accumulated around the pipe will gradually increase, and due to the existence of the thixotropy of the paste, the discharge pressure of the paste at the discharge port will not be enough to overcome the yield stress of the paste accumulated near the discharge port for a long time, which will eventually cause the filling pipe to be blocked, and the filling accident will be caused. In addition, the paste does not dehydrate, which makes the underground operator unable to determine the filling condition according to the wetting height of the retaining wall, the stope is overfilled, the internal space is in a high pressure state, which causes the slurry to be ejected, even the retaining wall to be collapsed, and a safety accident is caused, which seriously affects the filling efficiency.

[0006] In summary, compared with the traditional cemented filling slurry, the long entry type goaf paste filling top has technical difficulties, and the existing technical solutions cannot be completely applied to the paste filling application scene. Therefore, in view of the technical difficulties of the long entry type goaf paste filling, an effective filling technical solution is proposed to improve the filling quality and top rate, ensure the safety and efficiency of the filling operation, and further popularize the paste filling technology. SUMMARY

[0007] The present application provides a long entry type goaf paste filling one-time top method to solve the technical difficulties of the long entry type goaf paste filling.

[0008] The method comprises the following steps:

[0009] S1, laying the filling pipe:

[0010] The filling main pipe is led out from the paste conveying pipe network to the filling stope, the filling main pipe is connected with the three-way ball valve A, one port of the three-way ball valve A is connected with the blowdown pipe, and the other port is connected with the diaphragm pressure gauge and the matching connecting pipe; the diaphragm pressure gauge is connected with the three-way ball valve B, one port of the three-way ball valve B is connected with the end discharge pipe, and the other port is connected with the three-way ball valve C; one port of the three-way ball valve C is connected with the middle discharge pipe, and the other port is connected with the tail discharge pipe.

[0011] S2, filling retaining wall masonry:

[0012] After the filling pipeline is laid, the filling retaining wall is built with masonry material at the actual position needed, and a pressure relief pipe is arranged at each of the top plate and the two side walls of the access of the filling retaining wall;

[0013] S3, filling of the material:

[0014] After the filling retaining wall is built and cured for a certain period of time, the filling preparation work is checked and confirmed to be qualified, the ground paste station is informed to start filling, and the filling is sequentially performed according to the order of the end material discharging pipe, the middle material discharging pipe and the tail material discharging pipe.

[0015] S4, recovery of the pipe fittings and instruments:

[0016] After 24-36 hours from the end of the filling, the three-way ball valve A, the three-way ball valve B, the three-way ball valve C, the ball valve, the diaphragm pressure gauge and the matching connecting pipe fittings are removed and cleaned for maintenance, so as to be reused subsequently.

[0017] The filling main pipe is used to lead the paste slurry from the paste conveying pipe network to the stope, the blowdown pipe is used to lead the pipe lubricating water and pipe washing water to be discharged to the underground blowdown channel, the three-way ball valve is used to control the slurry discharge line, the pressure gauge is used to measure the pressure condition of the filling pipe network, so as to provide a control basis for adjusting the slurry discharge line, the end material discharging pipe, the middle material discharging pipe and the tail material discharging pipe are used to discharge the paste slurry to different parts of the access in different filling stages, the pressure relief pipe is used to discharge the air and the paste slurry in the stope, so as to balance the internal fluid medium pressure of the stope, and the ball valve is used to control the opening and closing state of the pressure relief pipe.

[0018] In the step S1, the end material discharging pipe, the middle material discharging pipe and the tail material discharging pipe are closely attached to the top plate of the access and are fixed by pipe clamps and expansion bolts, the end material discharging pipe and the middle material discharging pipe are arranged on the two sides of the access and are 0.5-1 m away from the side walls of the access, and the tail material discharging pipe is arranged in the middle of the access.

[0019] In the step S1, the discharging port of the end material discharging pipe is arranged at the end of the access and is 2-3 m away from the end of the access, the discharging port of the middle material discharging pipe is arranged in the middle of the access and is 15-20 m away from the discharging port of the end material discharging pipe, and the discharging port of the tail material discharging pipe is arranged near the filling retaining wall and is 5-10 m away from the filling retaining wall.

[0020] In the step S1, the number of the middle material discharging pipes and the number of the three-way ball valves are increased according to the length of the access, the distance between the discharging ports of two or more middle material discharging pipes is controlled to be 15-20 m, and the middle material discharging pipes of adjacent discharging ports are staggered and arranged on the two sides of the access and are 0.5-1 m away from the side walls of the access.

[0021] In the step S2, the thickness of the filling retaining wall meets the requirement of the top bearing capacity of one-time filling.

[0022] The pressure relief pipe in the step S2 passes through the filling retaining wall and extends into the stope by 0.3-0.5 m, and the pressure relief pipe is connected with a ball valve at the outside of the stope and fixed to the floor.

[0023] The specific steps in the step S3 are as follows:

[0024] S31, pipe lubrication and thickening stage:

[0025] The three-way ball valve B and the three-way ball valve A are adjusted to discharge the pipe lubrication water and the substandard slurry to the underground sewage channel through the sewage pipe, and the ball valve at the pressure relief pipe is kept in the fully open state;

[0026] S32, initial filling stage:

[0027] The slurry is taken from the outlet of the sewage pipe to determine the concentration, and after confirming that the slurry reaches the designed concentration, the three-way ball valve B and the three-way ball valve C are adjusted to discharge the paste slurry from the end downpipe into the stope, and the measured value of the diaphragm pressure gauge is recorded to determine the pressure of the paste discharge pipe under the normal state;

[0028] S33, forced roof connecting stage:

[0029] The measured value change rule of the diaphragm pressure gauge is recorded, and when the measured pressure value sharply increases, the three-way ball valve B and the three-way ball valve C are adjusted to discharge the paste slurry from the middle downpipe, and the measured value of the diaphragm pressure gauge returns to the size of the normal discharge pipe pressure;

[0030] The measured value change rule of the diaphragm pressure gauge is continuously recorded, and when the measured pressure value sharply increases again, the three-way ball valve C is adjusted to discharge the paste slurry from the tail downpipe;

[0031] The pressure relief pipe is observed, and when the pressure relief pipe stably discharges the paste, the surface paste station is informed to stop washing the pipe, and the three-way ball valve A is adjusted to discharge the paste slurry to the underground sewage channel through the sewage pipe, and the ball valve at the pressure relief pipe is closed to keep the stope in the full pressure roof connecting state;

[0032] The measured value change of the diaphragm pressure gauge is continuously recorded, and if the measured value of the diaphragm pressure gauge sharply rises, the ball valve of the pressure relief pipe is opened to discharge part of the paste, and the filling roof connecting is completed.

[0033] The filling main pipe, the sewage pipe, the end downpipe, the middle downpipe, the tail downpipe and the connecting pipes between the pipes in the steps S1 and S2 adopt the steel wire mesh framework polyethylene composite pipe, which has pressure bearing capacity;

[0034] The pressure relief pipe adopts the steel wire mesh framework polyethylene composite pipe, which has pressure bearing capacity.

[0035] The three-way ball valve is made of wear-resistant and pressure-resistant material, has equal-diameter pipe orifice and Y-shaped structure, has wear resistance and pressure resistance, and reduces local loss of the filling pipe network.

[0036] The diaphragm pressure gauge has a range of 0-3.00 MPa, the diaphragm of the pressure gauge is tangent to the inner wall of the connecting pipe and directly contacts the paste, and the measurement accuracy is improved.

[0037] Compared with the prior art, the technical scheme has at least the following beneficial effects:

[0038] The scheme is based on the rheological properties of the paste and the stope flow law, optimizes the arrangement of the discharge points, fully utilizes the extension distance of the paste, and makes the paste slurry of each discharge point fill the deposition slope surface of each other, overcomes the deficiency of the paste flowability, improves the roof contact rate, sets the pipeline control pipe and the detection instrument, records the pressure change of the filling pipe network, masters the stope filling condition, and uses the stope filling condition as the basis for controlling the paste discharge line, ensures the filling quality, achieves the purpose of one-time forced roof contact, effectively avoids the operation accidents caused by pipe blocking and excessive stope filling, ensures safe and efficient filling, and provides a new idea for paste filling in long advance-type goaf. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical scheme in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0040] Figure 1 The process flow chart of the long advance-type goaf paste filling one-time roof contact method of the present application is shown in the figure.

[0041] Figure 2 The arrangement schematic diagram of the long advance-type goaf paste filling one-time roof contact method of the present application is shown in the figure.

[0042] Figure 3 The figure is Figure 2 the enlarged schematic diagram of the middle part.

[0043] Figure 4 The figure is Figure 2 the B-B sectional view of the figure.

[0044] Figure 5 The figure is Figure 2 the C-D sectional view of the figure.

[0045] Figure 6 The figure is Figure 2 the C-E sectional view of the figure.

[0046] Figure 7 C-F profile diagram of Figure 2

[0047] Figure 8 C-F profile diagram of Figure 5

[0048] Figure 9 C-F profile diagram of Figure 6

[0049] Figure 10 C-F profile diagram of Figure 7

[0050] Wherein the figure mark explanation is as follows:

[0051] 1-adjacent access; 2-access goaf; 3-pressure relief pipe; 4-ball valve; 5-end downcomer; 6-middle downcomer; 7-tail downcomer; 8-three-way ball valve B; 9-diaphragm pressure gauge; 10-filling main pipe; 11-drain pipe; 12-pipe clamp; 13-filling retaining wall; 14-top plate; 15-bottom plate; 16-deposition slope; 17-extrusion diffusion slope; 18-deposition slurry; 19-extrusion diffusion slurry; 20-discharge slurry; 21-top space; 22-buried pipe; 23-slurry discharge line. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme of the embodiments of the present application will be described clearly and completely below with reference to the drawings of the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the described embodiments of the present application, all other embodiments obtained by those skilled in the art without any creative effort fall within the scope of protection of the present application.

[0053] Unless otherwise defined, the technical terms or scientific terms used in the present application shall be understood as the usual meanings understood by those skilled in the art to which the present application belongs. It should be noted that "up", "down", "left", "right", "front", "back" and the like used in the present application are only used to represent relative positional relationships, and when the absolute positions of the described objects are changed, the relative positional relationships may also be changed accordingly.

[0054] The present application provides a long-access goaf paste filling one-time top connecting method.

[0055] As shown in Figure 1 and Figure 2 , the method comprises the following steps:

[0056] S1, laying filling pipe;

[0057] ​​​​The filling main pipe is connected with a three-way ball valve A, one end of the three-way ball valve A is connected with a sewage pipe, and the other end is connected with a diaphragm pressure gauge and a matched connecting pipe fitting; the diaphragm pressure gauge is connected with a three-way ball valve B, one end of the three-way ball valve B is connected with an end portion discharging pipe, and the other end is connected with a three-way ball valve C; one end of the three-way ball valve C is connected with a middle portion discharging pipe, and the other end is connected with a tail portion discharging pipe;

[0058] S2, filling retaining wall masonry:

[0059] After the filling pipeline is laid, the filling retaining wall is masonryed at the actual position needed by using masonry material, and one discharge pipe is arranged at each of the positions where the filling retaining wall is located at the intersection of the roof and the two sides of the roadway;

[0060] S3, filling discharging:

[0061] After the filling retaining wall is masonryed and reaches the maintenance time length, it is checked and confirmed that the filling preparation work is qualified, the ground paste station is informed to start filling, and the filling is sequentially carried out according to the order of the end portion discharging pipe, the middle portion discharging pipe and the tail portion discharging pipe;

[0062] S4, pipe fitting instrument recovery:

[0063] After the filling is completed for 24-36 hours, the three-way ball valve A, the three-way ball valve B, the three-way ball valve C, the ball valve, the diaphragm pressure gauge and the matched connecting pipe fitting are removed and cleaned and maintained for subsequent repeated use.

[0064] In the step S1, the end portion discharging pipe, the middle portion discharging pipe and the tail portion discharging pipe are closely attached to the roof of the roadway and are fixed by pipe clamps and expansion bolts; the end portion discharging pipe and the middle portion discharging pipe are arranged on the two sides of the roadway and are located at a distance of 0.5-1 m from the side walls of the roadway; and the tail portion discharging pipe is arranged in the middle of the roadway.

[0065] In the step S1, the discharging port of the end portion discharging pipe is arranged at the end portion of the roadway and is located at a distance of 2-3 m from the end portion of the roadway; the discharging port of the middle portion discharging pipe is arranged at the middle portion of the roadway and is located at a distance of 15-20 m from the discharging port of the end portion discharging pipe; and the discharging port of the tail portion discharging pipe is arranged near the filling retaining wall and is located at a distance of 5-10 m from the filling retaining wall.

[0066] In the step S1, the number of the middle portion discharging pipes and the number of the three-way ball valves are increased according to the length of the roadway, the distance between the discharging ports of two or more middle portion discharging pipes is controlled to be 15-20 m, and the middle portion discharging pipes of adjacent discharging ports are arranged on the two sides of the roadway and are located at a distance of 0.5-1 m from the side walls of the roadway.

[0067] In the step S2, the thickness of the filling retaining wall meets the requirement of one-time filling and top bearing.

[0068] In the step S2, the discharge pipe extends into the stope by 0.3-0.5 m, and the discharge pipe is connected with a ball valve at one end outside the stope and is fixed to the floor.

[0069] The specific steps in the step S3 are as follows:

[0070] S31, pipe lubrication concentration stage:

[0071] Adjust the three-way ball valve B and the three-way ball valve A, so that the pipe lubrication water and the substandard slurry are discharged to the underground sewage channel through the sewage pipe, and the pressure relief pipe ball valve is kept in the fully open state;

[0072] S32, initial filling stage:

[0073] The slurry concentration is determined from the outlet of the sewage pipe, and after confirming that the slurry reaches the design concentration, the three-way ball valve B and the three-way ball valve C are adjusted, so that the paste slurry is discharged from the end downpipe into the stope, and the measured value of the diaphragm pressure gauge is recorded to determine the paste discharge pipe pressure under normal conditions.

[0074] S33, forced roof connecting stage:

[0075] The measured value change rule of the diaphragm pressure gauge is recorded, and when the measured pressure value sharply increases, the three-way ball valve B and the three-way ball valve C are adjusted, so that the paste slurry is discharged from the middle downpipe, and the measured value of the diaphragm pressure gauge returns to the normal discharge pipe pressure.

[0076] The measured value change rule of the diaphragm pressure gauge is continuously recorded, and when the measured pressure value sharply increases again, the three-way ball valve C is adjusted, so that the paste slurry is discharged from the tail downpipe.

[0077] The pressure relief pipe is observed, and when the pressure relief pipe stably discharges the paste, the surface paste station is informed to stop washing the pipe, and the three-way ball valve A is adjusted, so that the paste slurry is discharged to the underground sewage channel through the sewage pipe, and the ball valve at the pressure relief pipe is closed, so that the stope is kept in the full pressure roof connecting state.

[0078] The measured value change of the diaphragm pressure gauge is continuously recorded, and if the measured value of the diaphragm pressure gauge sharply rises, the pressure relief pipe ball valve is opened to discharge part of the paste, and the filling roof connecting is completed.

[0079] The filling main pipe, the sewage pipe, the end downpipe, the middle downpipe, the tail downpipe and the connecting pipe between each pipe in the steps S1 and S2 adopt the steel wire mesh framework polyethylene composite pipe, which has pressure bearing capacity.

[0080] The pressure relief pipe adopts the steel wire mesh framework polyethylene composite pipe, which has pressure bearing capacity.

[0081] The three-way ball valve is made of wear-resistant and pressure-resistant material, has equal-diameter pipe openings and Y-shaped structure, and has wear-resistant and pressure-resistant capacity; the ball valve is made of wear-resistant and pressure-resistant material, has equal-diameter pipe openings, and has wear-resistant and pressure-resistant capacity.

[0082] The diaphragm pressure gauge has a range of 0-3.00 MPa, and the diaphragm of the pressure gauge is tangent to the inner wall of the connecting pipe and directly contacts the paste.

[0083] The specific implementation process will be described below.

[0084] In the specific implementation, the structure parameters of the long advance entry stope are: width 5 m, height 4 m, and length 50 m.

[0085] The mass concentration of the paste slurry is 77%-79%, the slump is 26 cm, and the self-flow deposition slope is 2°.

[0086] The specific filling roof-contacting process is as follows:

[0087] S1, laying of the filling pipeline:

[0088] As shown in Figure 2 and Figure 3 , Figure 4 , the filling main pipe 10 is led out from the paste delivery pipe network to the filling stope, the filling main pipe 10 is connected to the three-way ball valve A, one port of the three-way ball valve A is led out to the blowdown pipe 11, and the other port is connected to the diaphragm pressure gauge 9 and the matching connecting pipe; the diaphragm pressure gauge 9 is connected to the three-way ball valve B 8, one port of the three-way ball valve B 8 is led out to the end part of the discharge pipe 5, and the other port is led out to the three-way ball valve C; one port of the three-way ball valve C is led out to the middle part of the discharge pipe 6, and the other port is led out to the tail part of the discharge pipe 7.

[0089] The filling main pipe 10 is used to lead out the paste slurry from the paste delivery pipe network to the entry goaf 2; the blowdown pipe 11 is used to lead out and discharge the pipe cleaning water, pipe washing water and the like to the underground blowdown channel; the three-way ball valves are used to control the slurry discharge line; the diaphragm pressure gauge 9 is used to measure the filling pipe network pressure condition, so as to provide a control basis for adjusting the slurry discharge line 23; and the end part of the discharge pipe 5, the middle part of the discharge pipe 6 and the tail part of the discharge pipe 7 are used to discharge the paste slurry to different parts of the entry goaf 2 in different filling stages.

[0090] As shown in Figure 8 , Figure 9 and Figure 10 , the end part of the discharge pipe 5, the middle part of the discharge pipe 6 and the tail part of the discharge pipe 7 are closely attached to the entry roof 14 and are fixed by the pipe clamp 12 and the expansion bolt.

[0091] The discharge port of the end part of the discharge pipe 5 is arranged near the end part of the entry goaf 2, and is 2 m away from the end part of the entry; the discharge port of the middle part of the discharge pipe 6 is arranged near the middle part of the entry goaf 2, and is 20 m away from the discharge port of the end part of the discharge pipe; and the discharge port of the tail part of the discharge pipe 7 is arranged near the filling retaining wall 13, and is 8 m away from the retaining wall.

[0092] The end part of the discharge pipe 5 and the middle part of the discharge pipe 6 are arranged on the two sides of the entry goaf 2, and are 0.5 m away from the side walls of the entry; and the tail part of the discharge pipe 7 is arranged in the middle of the entry goaf 2.

[0093] The filling main pipe 10, the drain pipe 11, the end downcomer 5, the middle downcomer 6, the tail downcomer 7 and the connecting pipe between each pipe are made of steel wire mesh framework polyethylene composite pipe, Φ108, PN 2.50MPa.

[0094] The three-way ball valve is made of wear-resistant and pressure-resistant material, and has equal-diameter pipe orifice.

[0095] The diaphragm pressure gauge has a range of 0-3.00MPa, and the diaphragm of the pressure gauge is tangent to the inner wall of the connecting pipe, and directly contacts the paste.

[0096] S2, filling retaining wall masonry:

[0097] After the filling pipeline is laid, the filling retaining wall 13 is masonryed at the designed position of the adjacent entry 1 goaf using water filtering blocks, the block size is 390mmx190mmx190mm, the retaining wall thickness is 590mm, which meets the one-time top filling bearing thickness requirement.

[0098] At the designed position of the filling retaining wall 13, one relief pipe 3 is arranged at each angle between the entry roof 14 and the two side walls, the relief pipe 3 extends into the stope by 0.3m, and the other end of the relief pipe 3 is connected with the ball valve 4 and fixed to the floor 15.

[0099] The relief pipe 3 is used for discharging air and paste slurry in the stope, so as to balance the internal fluid medium pressure of the stope; the ball valve 4 is used for controlling the opening and closing state of the relief pipe.

[0100] The relief pipe is made of steel wire mesh framework polyethylene composite pipe, Φ108, PN 2.50MPa; the ball valve is made of wear-resistant and pressure-resistant material, and has equal-diameter pipe orifice.

[0101] S3, filling downcomer:

[0102] After the filling retaining wall 13 is masonryed and reaches the maintenance time, the filling preparation work is checked and confirmed to be qualified, and the ground paste station is informed to start filling.

[0103] Pipe wetting and thickening stage: control the three-way ball valve, so that the pipe wetting water and the unqualified slurry are discharged to the underground drain channel through the drain pipe 11. Keep the ball valve 4 of the relief pipe 3 in the fully open state.

[0104] Initial filling stage: take the slurry from the outlet of the drain pipe 11 to determine the concentration, and after confirming that the slurry reaches the designed concentration, adjust the three-way ball valve, so that the paste slurry is discharged from the end downcomer 5 into the entry goaf 2, record the measured value of the diaphragm pressure gauge 9, and determine that the paste discharge pipe pressure is 0.5MPa-0.6MPa under normal condition.

[0105] If Figure 5 , Figure 6 and Figure 7As shown, the stage paste slurry is discharged to the end of the access through the end of the discharge pipe 5, with the gradual accumulation of paste at the end of the access, extrusion diffusion slurry 19 along the access wall from the end to the end of the retaining wall diffusion, flow, paste diffusion process forming extrusion diffusion slope 17, gradually paved access floor 15, forming the deposited slurry 18; extrusion diffusion slurry 19 is not pushed to the place, the deposited paste forms a deposition slope 16, and the discharge slurry 20 is further diffused on the deposition slope 16, gradually covering the deposition slope 16, the liquid level rises, filling the upper top contact empty area 21. The "end of the discharge pipe", "middle of the discharge pipe" and "tail of the discharge pipe" are sequentially buried by the slurry during the entire filling process to form a buried pipeline 22.

[0106] Forced roof contact stage: record the change rule of the measured value of the diaphragm pressure gauge 9, when the measured pressure value increases sharply, adjust the three-way ball valve to discharge the paste slurry from the middle of the discharge pipe 6, and the measured value of the diaphragm pressure gauge 9 returns to the normal discharge pipe pressure; continue to record the change rule of the measured value of the diaphragm pressure gauge 9, when the measured pressure value increases sharply again, adjust the three-way ball valve to discharge the paste slurry from the tail of the discharge pipe 7; observe the pressure relief pipe 3, when the paste is stably discharged from the 3 pressure relief pipe, inform the ground paste station to stop washing the pipe, and adjust the three-way ball valve to discharge the paste slurry through the blowdown pipe 11 to the underground blowdown channel, and at the same time close the ball valve 4 at the pressure relief pipe 3 to maintain the full pressure roof contact state of the stope; continue to record the change of the measured value of the diaphragm pressure gauge 9, if the value of the diaphragm pressure gauge 9 is found to rise sharply, open the ball valve 4 of the pressure relief pipe 3 to discharge part of the paste, and complete the filling roof contact.

[0107] In this stage, due to the proximity of the discharge port to the end of the access, as the paste liquid level rises, the paste near the end of the access first contacts the roof, and as the roof surface gradually advances to the end of the filling retaining wall 13, the paste gradually buries the discharge port of the end of the discharge pipe 5, and as the roof surface advances, the paste accumulated at the discharge port of the end of the discharge pipe 5 gradually increases. Due to the existence of thixotropy of the paste, the paste discharge pressure of the end of the discharge pipe 5 is not enough to overcome the yield stress of the paste flow near the discharge port, the end of the discharge pipe 5 is blocked, causing the filling pipe network pressure to rise, and the measured value of the diaphragm pressure gauge 9 increases; after adjusting the three-way ball valve, the paste is discharged from the middle of the discharge pipe 6 and the tail of the discharge pipe 7, the roof surface gradually advances to the vicinity of the filling retaining wall 13, and overflows through the pressure relief pipe 3, completing the roof contact.

[0108] S4, pipe instrument recovery: after 24-36 hours of filling, the paste coagulates to form a certain strength, the three-way ball valve, ball valve, diaphragm pressure gauge and supporting connecting pipe fittings are removed and cleaned for maintenance, so as to be reused subsequently.

[0109] The above is a long advance route type goaf paste filling one-time roof contacting method embodiment technical scheme provided by the present application, based on the rheological properties of the paste and its stope flow law, by optimizing the arrangement of the unloading points, fully utilizing the paste expansion distance while making the slurry of each unloading point fill the deposition slope surface of each other, overcoming the deficiency of the paste fluidity, improving the roof contacting rate; setting the pipeline control pipe fittings and detection instruments, by recording the filling pipe network pressure change, mastering the stope filling condition, taking this as the basis for controlling the paste discharge line, ensuring the filling quality, achieving the purpose of one-time forced roof contacting, at the same time effectively avoiding the operation accidents caused by pipe blocking and excessive stope filling, ensuring safe and efficient filling.

[0110] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A long advance longwall goaf paste filling one roof contact method, characterized in that, It comprises the following steps: S1, laying filling pipeline: The filling main pipe is led out from the paste conveying pipe network to the filling stope, the filling main pipe is connected with three-way ball valve A, one end of three-way ball valve A is connected with the sewage pipe, the other end is connected with the diaphragm pressure gauge and the matching connecting pipe; the diaphragm pressure gauge is connected with three-way ball valve B, one end of three-way ball valve B is connected with the end discharge pipe, the other end is connected with three-way ball valve C; one end of three-way ball valve C is connected with the middle discharge pipe, the other end is connected with the tail discharge pipe; S2, filling retaining wall masonry: After the filling pipeline is laid, the filling retaining wall is masonryed at the actual position using masonry material, and one discharge pipe is arranged at each of the intersection of the inlet way roof and the two side walls of the filling retaining wall; S3, filling discharging: After the filling retaining wall is masonryed and the maintenance time is reached, the filling preparation work is checked and confirmed to be qualified, the ground paste station is informed to start filling, and the filling is sequentially carried out according to the order of the end discharge pipe, the middle discharge pipe and the tail discharge pipe; S4, pipe instrument recovery: After 24-36 hours of filling, three-way ball valve A, three-way ball valve B, three-way ball valve C, ball valve, diaphragm pressure gauge and matching connecting pipe are removed and cleaned for maintenance, so as to be reused later; In step S1, the end discharge pipe, the middle discharge pipe and the tail discharge pipe are closely attached to the inlet way roof and are fixed by pipe clamp and expansion bolt; the end discharge pipe and the middle discharge pipe are arranged on the two sides of the inlet way, 0.5-1 m away from the side wall of the inlet way; the tail discharge pipe is arranged in the middle of the inlet way; In step S3, the specific steps are as follows: S31, pipe lubrication and thickening stage: Adjust three-way ball valve B and three-way ball valve A, so that the pipe lubrication water and the non-standard slurry are discharged to the underground sewage channel through the sewage pipe, and the ball valve at the discharge pipe is kept in fully open state; S32, initial filling stage: The slurry concentration is determined from the outlet of the sewage pipe, and after the slurry concentration reaches the design concentration, three-way ball valve B and three-way ball valve C are adjusted, so that the paste slurry is discharged from the end discharge pipe into the stope, the measured value of the diaphragm pressure gauge is recorded, and the normal state paste discharge pipe pressure is determined; S33, forced roof connecting stage: The measured value change rule of the diaphragm pressure gauge is recorded, when the measured pressure value sharply increases, three-way ball valve B and three-way ball valve C are adjusted, so that the paste slurry is discharged from the middle discharge pipe, and the measured value of the diaphragm pressure gauge returns to the normal discharge pipe pressure; The measured value change rule of the diaphragm pressure gauge is continuously recorded, when the measured pressure value sharply increases again, three-way ball valve C is adjusted, so that the paste slurry is discharged from the tail discharge pipe; The discharge pipe is observed, when the discharge pipe stably discharges the paste, the ground paste station is informed to stop washing the pipe, and three-way ball valve A is adjusted, so that the paste slurry is discharged to the underground sewage channel through the sewage pipe, and the ball valve at the discharge pipe is closed, so that the stope is kept in full pressure roof connecting state; The measured value change of the diaphragm pressure gauge is continuously recorded, if the measured value of the diaphragm pressure gauge sharply increases, the ball valve at the discharge pipe is opened to discharge part of the paste, and the filling roof connecting is completed.

2. The long advance cut-and-fill paste backfill method according to claim 1, wherein, The end discharge pipe discharge port in the step S1 is arranged at the end of the access, 2-3 m away from the end of the access; the middle discharge pipe discharge port is arranged at the middle of the access, 15-20 m away from the end discharge pipe discharge port; and the tail discharge pipe discharge port is arranged near the filling retaining wall, 5-10 m away from the filling retaining wall.

3. The long advance cut-and-fill paste backfill method according to claim 1, wherein, In the step S1, the number of middle discharge pipes and the number of three-way ball valves are increased according to the length of the access, the distance between two or more middle discharge pipe discharge ports is controlled to be 15-20 m, and the adjacent discharge ports are staggered and arranged on the two sides of the access, 0.5-1 m away from the sidewall of the access.

4. The long advance cut-and-fill paste backfill method according to claim 1, wherein, In the step S2, the thickness of the filling retaining wall meets the requirement of one-time filling roof bearing.

5. The longwall gobs paste backfill one roof contact method as claimed in claim 1, wherein, In the step S2, the pressure relief pipe penetrates through the filling retaining wall and extends into the stope by 0.3-0.5 m, and the pressure relief pipe is connected with a ball valve at one end outside the stope and fixed to the floor.

6. The longwall gob paste backfill one-pass roof- contact method of claim 1 wherein, In the steps S1 and S2, the filling main pipe, the drain pipe, the end discharge pipe, the middle discharge pipe, the tail discharge pipe and the connecting pipes between the pipes are made of steel wire mesh framework polyethylene composite pipes, which have pressure bearing capacity. The pressure relief pipe is made of a steel wire mesh framework polyethylene composite pipe, which has pressure bearing capacity.

7. The longwall gob paste backfill one-pass roof- contact method of claim 1 wherein, The three-way ball valve is made of wear-resistant and pressure-resistant material, has equal-diameter pipe ports, Y-shaped structure, and has wear resistance and pressure bearing capacity; and the ball valve is made of wear-resistant and pressure-resistant material, has equal-diameter pipe ports, and has wear resistance and pressure bearing capacity.

8. The longwall gob paste backfill one-pass roof- contact method of claim 1 wherein, The diaphragm pressure gauge has a range of 0-3.00 MPa, the diaphragm of the pressure gauge is tangent to the inner wall of the connecting pipe, and directly contacts the paste.

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