CN-116877177-B - Gas control method for floor roadway with directional rock holes replacing extraction pipelines

CN116877177BCN 116877177 BCN116877177 BCN 116877177BCN-116877177-B

Abstract

A gas control method for the bottom plate roadway of directional rock hole instead of extraction pipeline includes such steps as designing and constructing the extraction system for bottom plate roadway instead of extraction pipeline, designing and constructing the construction track parameters of directional rock hole, correcting the construction track parameters of directional rock hole twice, calculating the inclination angle of extraction branch hole, regulating the construction, plugging the extraction branch hole, connecting the extraction branch hole with single hole, installing and monitoring unit, designing and constructing the drainage device, and synchronous extraction. The invention can realize pipeline-free, low-cost and full-period extraction in the bottom plate roadway, reduce the engineering quantity of the mine in the aspects of installation, maintenance, dismantling and the like of the extraction system, and improve the gas extraction treatment effect of the mine and the extraction safety of the working face.

Inventors

LIU XIAO
LIU ZHONGYI
WANG CHAOFENG
CHEN JIANWEI
Du Liuqun
XUE XIAOGANG
YANG CHENGTAO
REN PEILIANG
LIN HAIXIAO
QIN JIANHUI
ZHANG ZHIFENG
PAN JIENAN
HAN YONGQIANG
XUAN DEQUAN

Assignees

河南理工大学

Dates

Publication Date: 20260508
Application Date: 20230630

Claims (9)

1. The floor roadway gas treatment method for replacing the extraction pipeline by the directional rock hole is characterized by comprising the following steps of (1) designing and constructing a floor roadway directional rock hole replacing extraction pipeline extraction system to carry out floor roadway gas treatment and extraction, namely (1) designing and constructing construction track parameters of the directional rock hole, (2) carrying out secondary correction on the construction track parameters of the directional rock hole, (3) calculating and constructing adjustment of a construction dip angle of an extraction branch hole, (4), plugging the extraction branch hole and connecting the extraction branch hole with a single hole, (5) installing and monitoring a unit metering and monitoring device, (6) designing and constructing a drainage device of the extraction pipeline, (7) completing the connection of the whole extraction system, and synchronously extracting along with the extraction of a working face; The step (1) comprises the following steps: (1.1) construction track parameter design of directional rock holes: Taking the center of a tunnel roof at the first extraction branch hole position of the bottom plate tunnel as a starting point, marking the starting point as T 1 （X T1 、Y T1 、Z T1 , wherein X T1 =0、Y T1 =0、Z T1 =0, the direction along the central line of the bottom plate tunnel is Y, the left-right width direction of the bottom plate tunnel is X, the up-down direction is Z, then measuring the coordinate of the center of the tunnel roof once every 5m interval (assuming that the distance between drilling rows of the bottom plate tunnel is 5 m), and marking the n-th measuring point as Tn (X Tn 、Y Tn 、Z Tn ); The coordinates Tn are respectively translated to the left and the right for 8m, so that the construction track coordinates D n （X Dn 、Y Dn 、Z Dn ) and En (X En 、Y En 、Z En ) of two directional rock holes on the left and the right sides of the bottom plate roadway can be obtained; (1.2) construction of directional rock holes: Constructing construction track coordinates D n （X Dn 、Y Dn 、Z Dn ) and En (X En 、Y En 、Z En ) of two directional rock holes on the left side and the right side of the bottom plate roadway designed in the step (1.1) by combining track setting of a directional drill carriage, wherein the directional drill field is outwards arranged 20-30 m away from a first extraction branch hole because the directional drill carriage is a direction-changing construction section, so that the direction-changing section of the directional drill carriage can be constructed to the designed construction track coordinates, constructing a directional drill field on each of the left side and the right side of the bottom plate roadway, then constructing the directional rock holes in the directional drill field at the position of a top plate of the bottom plate roadway in parallel to the tunneling direction of the bottom plate roadway, and constructing the directional rock holes by adopting a drill bit with phi 193 mm; And after the construction of the directional rock hole is completed and the working face reaches the standard, the outer port of the directional rock hole is communicated with a pumping pipeline at the special return roadway.
2. The method for treating the gas of the bottom plate roadway of the directional rock hole replacing extraction pipeline according to claim 1, wherein the step (2) is characterized in that the test data of the drilling track tester is closer to the real situation based on the fact that the construction of the directional drill is continuously fine-tuned, so that the construction track parameters of the directional rock hole of the directional drill are based on the test data of the drilling track tester; And measuring the construction track of the two directional rock holes by adopting a drilling track tester, carrying out secondary correction on the construction track parameters of the directional rock holes, and respectively assigning corrected construction track coordinate data to coordinates D n （X Dn 、Y Dn 、Z Dn ) and En (X En 、Y En 、Z En ) to finish the secondary correction on the construction track parameters of the directional rock holes.
3. The floor roadway gas treatment method for the directional rock hole replacement extraction pipeline according to claim 2 is characterized in that the step (3) is specifically as follows: (3.1) calculating the construction inclination angle of the extraction branch hole by adopting a trigonometric function method according to the track parameters of the directional rock Kong Shigong after the secondary correction in the step (2) and combining the construction positions calibrated on site of the extraction branch hole; Calibrating the distances between the left extraction branch hole and the right extraction branch hole from the bottom plate roadway top plate to be Lh and Rh respectively, and calibrating the bottom plate roadway width to be K, wherein the assignment of the opening coordinates Ln (X Ln 、Y Ln 、Z Ln ) of the n-th extraction branch hole on the left side and the assignment of the opening coordinates Rn (X Rn 、Y Rn 、Z Rn ) of the n-th extraction branch hole on the right side are as follows respectively: The opening coordinates Ln of the nth extraction branch hole on the left side are X Ln =X Tn -0.5*K、Y Ln =Y Tn 、Z Ln =Z Tn -Lh, and the construction inclination angle A Ln of the nth extraction branch hole on the left side is A Ln =arctan[Lh/（X Dn -X Ln ); The construction inclination angle A Rn of the nth extraction branch hole on the right side is A Rn =arctan[Rh/（X Dn -X Rn when the opening coordinates Rn of the nth extraction branch hole on the right side are X Rn =X Tn +0.5*K、Y Rn =Y Tn 、Z Rn =Z Tn -Rh; (3.2) construction adjustment of the extraction branch hole: After the hole opening position and the construction inclination angle of the extraction branch hole are calibrated, a small-aperture exploratory hole (phi 32 mm) is constructed at the hole opening position of the extraction branch hole in a bottom plate roadway by adopting an anchor cable drilling machine, and the small-aperture exploratory hole is extended into a small-aperture exploratory hole by utilizing an intra-hole peeping instrument to check the penetrating position of the small-aperture exploratory hole, if the small-aperture exploratory hole is not penetrated, the hole opening position and the construction inclination angle are finely adjusted after cement is injected to seal tightly, the small-aperture exploratory hole is re-constructed until the small-aperture exploratory hole is penetrated with the directional rock hole, the construction inclination angle is finely adjusted according to the checking condition of the in-hole peeping instrument, the penetrating position is positioned at the middle lower part of the wall of the directional rock hole so as to facilitate the outward discharge of drilling cuttings and ponding in the directional rock hole, and then the small-aperture extraction branch hole is constructed by adopting a large-diameter (phi 155 mm) drill bit according to the finally finely adjusted construction inclination angle.
4. The floor roadway gas treatment method for the directional rock hole replacement extraction pipeline according to claim 3, wherein the step (4) is specifically as follows: (4.1) plugging of the extraction branch hole: The extraction branch pipe is used for plugging the extraction branch hole, the length of the extraction branch pipe is 7m, the extraction branch pipe is made of plastic hoses with bags at two ends, the outer diameter of the extraction branch pipe is phi 120 mm-phi 150mm, the distance between the bags at the inner side and the oriented rock holes phi 190mm is 1-2 m, the bags at the outer side are positioned at the position of the opening of the extraction branch hole inwards by 1m, the extraction branch hole is plugged in a mode of plugging at two ends and grouting in the middle, the grouting depth of the hole sealing is not less than 5m, and the sealing performance of grouting hole sealing sections of the extraction branch pipe is ensured; (4.2) connection of extraction branch hole and single hole: The outer port of the extraction branch pipe is connected with an extraction connecting tap, at least 14 short joints with the outer diameter phi of 50mm are connected to the extraction connecting tap, and each short joint is respectively connected with the outer end of each single-hole sealing hose of the extraction branch hole position of the bottom plate roadway for continuous extraction.
5. Taking the measurement monitoring of a unit at the left side of the bottom plate roadway as an example, constructing two monitoring branch holes with proper intervals at each 200m position to be communicated with the directional rock holes, wherein the monitoring branch holes are the same as the construction method of the extraction branch holes, sealing holes are also carried out by adopting plastic hoses, then installing a sub-unit measurement monitoring device in the bottom plate roadway, two ends of the sub-unit measurement monitoring device are respectively connected with the outer ports of the two monitoring branch hole sealing holes, and then blocking the directional rock holes at the middle section of the two monitoring branch holes, so that the gas flowing direction of the directional rock holes is changed into U-shaped flow at the blocking position, and the U-shaped flow is re-flowed into the directional rock holes after passing through the sub-unit measurement monitoring device; after the working face reaches the standard and judges and finishes, the sub-unit metering monitoring device is removed and recycled, and then a plastic hose is used for replacing the sub-unit metering device to communicate the blocking and blocking positions of the directional rock holes.
6. The method for managing gas in the bottom plate roadway of the directional rock hole replacing extraction pipeline according to claim 5 is characterized in that the extraction pipeline adopts a negative pressure automatic water discharging principle to design a water discharging device, namely a water discharging branch hole with an upward elevation angle is constructed at a U-shaped or V-shaped deformation slope low point of the directional rock hole and a unit metering monitoring device, the construction method of the water discharging branch hole is the same as that of the extraction branch hole, the water discharging branch hole is communicated with the directional rock hole, the water discharging branch hole is sealed by using a water discharging branch pipe, the outer end of the water discharging branch pipe is connected with a water discharging hose through a connector, then a pump pit with a depth not less than 1m is constructed at the lower part outside the water discharging branch hole, a water bucket is arranged in the pump pit, the height is not less than 1.5m, water is filled in the water bucket, the inner diameter of the water bucket is larger than the outer diameter of the water discharging hose, the lower end of the water discharging hose is placed in the water bucket, the water discharging branch hole can ensure the negative water discharging pressure of 20KPa in the directional rock hole, if the negative pressure in the directional rock hole is 30KPa or higher, the negative pressure in the water discharging branch hole is converted into a water bucket with a corresponding height, and the water discharging principle is realized by using the corresponding high level; After the working face reaches the standard and is judged, the water draining device is kept in the bottom plate roadway without recovery.
7. The method for controlling gas in the floor roadway of the directional rock hole replacement extraction pipeline according to claim 6, wherein the step (7) is characterized in that after the step is completed, the directional rock hole replacement extraction pipeline is completed, and then the connection of the whole extraction system is completed, and synchronous extraction can be carried out along with working face extraction.
8. The method for treating the gas of the bottom plate roadway of the directional rock hole replacing extraction pipeline according to claim 7, wherein the specific operation of blocking the directional rock hole in the step (5) is that a through blocking branch hole is constructed at the position where the directional rock hole needs to be blocked, the blocking branch hole is the same as the extraction branch hole in construction method, then a bag is placed in the blocking branch hole to the position where the directional rock hole needs to be blocked, and then the directional rock hole is blocked at the position by grouting or glue injection into the bag.
9. The method for managing gas in the floor roadway of the directional rock hole replacing extraction pipeline of claim 7, wherein when a rock column crack caused by an upper anchor rod of the roadway penetrates the directional rock hole or a crack formed by compression deformation at a shoulder hole of the floor roadway at a later stage penetrates the directional rock hole during tunneling of the floor roadway, the rock column is leaked, the rock column is a rock mass between the upper part of the roadway of the floor roadway and the directional rock hole, and the method for treating the leakage of the rock column is as follows: (I) Actively preventing, namely increasing the thickness of a rock column between the directional rock hole and the roadway wall of the bottom plate roadway, and keeping the thickness of the rock column to be 8m according to the simulation conditions of peeping of drilling and separation deformation of surrounding rock, so that the penetration of cracks can be isolated, and the length of the rock column is far beyond the length of the anchor rod, and is 3 m-5 m; And (II) passively treating, namely when serious leakage of the rock column occurs, constructing a post-grouting drilling hole in a leakage area, constructing drilling holes in the post-grouting drilling hole depth of 3m, and respectively constructing the drilling holes at positions which are 1.5m away from the upper, lower, left and right sides of the leakage point by taking the leakage point as a center, performing high-pressure grouting, and plugging and filling surrounding rock cracks.

Description

Gas control method for floor roadway with directional rock holes replacing extraction pipelines Technical Field The invention relates to the technical field of gas extraction and control, in particular to a bottom plate roadway gas control method for replacing extraction pipelines with directional rock holes. Background The existing PVC extraction pipeline is still a main way of a gas extraction treatment system in China, but the technology often has the problems that the hanging engineering quantity of the extraction pipeline of the bottom plate roadway is large, the extraction pipeline occupies a large space and is rich in paving materials, the installation of the recovery pipeline is time-consuming and labor-consuming, the material recovery loss ratio (the recovery rate of screws and flange leather pads is less than 20 percent), the bottom plate extraction pipeline cannot be extracted during the working face recovery period (the recovery is carried out when the working face begins to recover), the air return gas emission quantity is high, and the like. However, at present, when the mine is used for selecting the layer of the bottom plate roadway, the influence of factors such as deformation instability of the bottom plate roadway is more considered, so that the service life of the bottom plate roadway is prolonged by selecting the layer (by increasing a rock column and selecting the layer with stable lithology), reinforcing support (by adopting an anchor net rope and guniting composite support form) and the like, the deformation degree is reduced, and particularly, the deformation amount of the roadway side is very little. Meanwhile, the mature directional drilling construction technology and the drilling track measurement technology provide technical support for the possibility of implementing the floor roadway directional rock hole instead of the extraction pipeline. And the synchronous gas control and power generation requirements of the bottom plate roadway during the stoping of the working face of the mine also provide a wide application market for the implementation of the technology. Disclosure of Invention The invention aims to provide a gas control method for a bottom plate roadway with directional rock holes instead of extraction pipelines, which mainly solves the problems of large occupied space, low use efficiency, high laying cost, difficult operation and maintenance, incapability of synchronous extraction along with working face extraction and the like of a PVC extraction pipeline system used in the bottom plate roadway. In order to achieve the above purpose, the invention adopts the following technical scheme: A gas control method for the bottom plate roadway of directional rock hole instead of extraction pipeline includes such steps as designing and constructing the extraction system for bottom plate roadway instead of extraction pipeline, designing and constructing the construction track parameters of directional rock hole, correcting the construction track parameters of directional rock hole twice, calculating the inclination angle of extraction branch hole, regulating the construction, plugging the extraction branch hole, connecting the extraction branch hole with single hole, installing and monitoring unit, designing and constructing the drainage device, and synchronous extraction. The step (1) comprises the following steps: (1.1) construction track parameter design of directional rock holes: Taking the center of a tunnel roof at the first extraction branch hole position of the bottom plate tunnel as a starting point, marking the starting point as T 1（XT1、YT1、ZT1), wherein X T1=0、YT1=0、ZT1 =0, the direction of the central line of the bottom plate tunnel is Y, the left-right width direction of the bottom plate tunnel is X, the up-down direction is Z, then measuring the coordinate of the center of the tunnel roof once every 5m (assuming that the distance between drilling rows of the bottom plate tunnel is 5 m), marking the n-th measuring point as Tn (X Tn、YTn、ZTn), and assuming that the n-th measuring point is positioned at the left side a meter and the upper side b meter of the starting point, calculating the coordinate of the n-th measuring point as X Tn=-a、YTn=5*n、ZTn =b; The coordinates Tn are respectively translated to the left and the right by 8m (roadway width+rock column thickness, and rock column thickness is adjusted according to mine conditions or simulation conditions), so that construction track coordinates D n（XDn、YDn、ZDn and En (X En、YEn、ZEn) of two directional rock holes on the left and the right sides of a bottom plate roadway can be obtained, and specific assignment conditions of the construction track coordinates D n（XDn、YDn、ZDn) and En (X En、YEn、ZEn) are as follows: the construction trajectory coordinates D n：XDn= XTn-8、YDn= YTn、ZDn= ZTn of the left directional rock hole, i.e., X Dn= -a-8、YDn= 5*n、ZDn =b; The construction track coordinate En of the right directional