CN219104226U - Real-time monitoring instrument for roadway surrounding rock stress dynamic change - Google Patents
Real-time monitoring instrument for roadway surrounding rock stress dynamic change Download PDFInfo
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- CN219104226U CN219104226U CN202222427760.3U CN202222427760U CN219104226U CN 219104226 U CN219104226 U CN 219104226U CN 202222427760 U CN202222427760 U CN 202222427760U CN 219104226 U CN219104226 U CN 219104226U
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Abstract
The utility model relates to the field of mine exploitation disaster monitoring, in particular to a real-time monitoring instrument for dynamic change of roadway surrounding rock stress. A real-time monitoring instrument for dynamic change of surrounding rock stress of a roadway comprises surrounding rock stress monitoring equipment and a data acquisition device, wherein the surrounding rock stress monitoring equipment is correspondingly inserted into a drill hole near the coal wall side of a working face of the roadway, and the surrounding rock stress monitoring equipment is in signal connection with the data acquisition device. The utility model can accurately monitor and real-time monitor the stress condition of the surrounding rock of the roadway, furthest improves the monitoring force, can be reused, and reduces the cost of monitoring equipment.
Description
Technical Field
The utility model relates to the field of mine exploitation disaster monitoring, in particular to a real-time monitoring instrument for dynamic change of roadway surrounding rock stress.
Background
Along with the continuous increase of coal exploitation depth and exploitation intensity in China, dynamic disaster accidents such as rock burst and the like are extremely easy to occur in deep mines, and serious equipment damage, casualties and the like are caused. Because the deep coal rock mass is in the surrounding rock environment of 'three-high and one-disturbance', the surrounding rock structure can be subjected to larger stress after the tunnel and the working face are excavated, and the stress abnormal heightening areas with different degrees can be formed in the supporting pressure acting range. These areas with abnormally increased stress are main areas where dynamic disasters such as rock burst occur, so that the areas must be monitored in a reinforced manner, and the stress distribution range and peak value of the surrounding rock of the roadway are known, so that the normal recovery of the working surface and the roadway is ensured. Therefore, for deep mine, especially for the roadway with impact risk, a certain monitoring device and instrument are required to monitor the surrounding rock of the roadway, so that the accuracy and the effectiveness of the monitoring result are ensured.
At present, equipment for monitoring surrounding rock of a roadway mainly drills holes in the coal wall of the roadway, and changes of coal and rock mass in the surrounding rock are monitored through the drilled holes. The monitoring method is mainly divided into two modes, namely a traditional method, namely physical monitoring mainly based on a drilling cutting method, wherein the coal dust amount obtained by drilling is used as a standard for mainly judging the stress; the other is the modern method, namely the monitoring mainly based on the force measuring device, including a strain gauge type force measuring rod, a hydraulic force measuring rod and the like. Although the two types are used up to now and have some irreplaceable advantages, the two types have more defects, such as the need of weighing the coal dust amount every 1 meter during the monitoring of the drilling cutting method, and a plurality of uncertain factors and larger errors; the metal force measuring rod has discontinuous data and lag result during monitoring, and is greatly affected by humidity, temperature and the like, so that the monitoring result has no timeliness and accuracy. Therefore, in order to ensure the real-time monitoring and accurate monitoring of the roadway surrounding rock stress to the greatest extent, it is necessary to research a real-time monitoring instrument for the dynamic change of the roadway surrounding rock stress.
Disclosure of Invention
The utility model aims to provide a real-time monitoring instrument for the dynamic change of the stress of the surrounding rock of a roadway, which can accurately monitor and real-time monitor the stress condition of the surrounding rock of the roadway, improves the monitoring strength to the greatest extent, can be reused, and reduces the cost of monitoring equipment.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a real-time monitoring instrument for dynamic change of surrounding rock stress of a roadway comprises surrounding rock stress monitoring equipment and a data acquisition device, wherein the surrounding rock stress monitoring equipment is correspondingly inserted into a drill hole near the coal wall side of a working face of the roadway, and the surrounding rock stress monitoring equipment is in signal connection with the data acquisition device.
The surrounding rock stress monitoring equipment comprises a plurality of sections of monitoring rods, the monitoring rods are horizontally arranged in the front-back direction, the monitoring rods are longitudinally spaced and sequentially connected in a head-to-tail mode, an oil pressure annular bag is sleeved on the monitoring rods, the inner wall of the oil pressure annular bag is fixedly bonded with the outer circumference of the monitoring rods, the adjacent ends of the two adjacent oil pressure annular bags are fixedly provided with oil pipe quick connectors, the two adjacent oil pressure annular bags are connected through corresponding oil pipe quick connectors, the front end of the monitoring rod at the forefront side is fixedly connected with a front-to-tip thick conical drill bit, the rear end face of the conical drill bit is fixedly bonded with the front end of the oil pressure annular bag on the monitoring rod at the forefront side, a plurality of stress sensors arranged in a circumferential array are fixedly bonded on the outer circumference of the middle of the monitoring rod, the stress sensors are in contact with the inner wall of the oil pressure annular bag, the rear end of the oil pressure annular bag at the rearmost side is provided with a pressure meter and an oil supply port, the outer end of the oil supply port is provided with an oil supply valve, and the data collector is respectively connected with the stress sensors through lead signals.
The monitoring rod is made of metal materials, a plurality of grooves which are arranged in a circumferential array are formed in the outer circumference of the middle of the monitoring rod, each stress sensor is correspondingly and adhesively embedded in each corresponding groove, and the height of each stress sensor is higher than the depth of each groove.
The outer circumference of the monitoring rod is provided with round wire placing grooves for arranging wires along the length direction of the grooves near the grooves.
The length of the monitoring rod is 1-1.2 m, the diameter of the monitoring rod is 30mm, the diameter of the oil pressure annular bag is 60mm, and the maximum diameter of the conical drill bit is the same as the diameter of the oil pressure annular bag.
By adopting the technical scheme, the real-time monitoring method for the dynamic change of the roadway surrounding rock stress comprises the following steps:
firstly, drilling holes in a roadway area of a working face needing surrounding rock stress monitoring;
secondly, assembling surrounding rock stress monitoring equipment according to the drilling depth;
thirdly, sending surrounding rock stress monitoring equipment into the borehole;
fourthly, connecting surrounding rock stress monitoring equipment with a data collector in a signal mode, calibrating the surrounding rock stress monitoring equipment, and starting monitoring work;
and fifthly, monitoring the stress change trend and the distribution range of the surrounding rock of the roadway in real time through a data acquisition device, pre-warning rock burst through a data result, and timely taking certain pressure relief measures to dynamically treat the surrounding rock of the roadway, so that the stability of the surrounding rock of the roadway is ensured, and the occurrence of the rock burst is reduced.
The step (I) comprises the following steps: selecting a working face roadway area needing surrounding rock stress monitoring, selecting a proper position on the coal wall side of the roadway near the working face to drill holes, and leading the drilling position to the working face within a range of 40-200 m.
The drilling in the step (one) is specifically arranged as follows: drilling holes in the position, which is close to the middle part of the coal wall, of the roadway, wherein the drilling depth is 3-5 times of the width of the roadway, namely the lateral supporting pressure range of surrounding rock of the roadway is reached, and the lateral supporting pressure range is particularly 6-15 m, and the drilling holes are determined by considering geological conditions and mining conditions; the distance between two adjacent drilling holes is 10-15 m, the diameter of each drilling hole is 90-100 mm, the drilling holes are drilled in the horizontal direction, and the fact that more coal dust is not in the drilling holes is ensured.
The second step is specifically as follows: and determining the length of surrounding rock stress monitoring equipment according to the drilling depth, selecting a proper number of monitoring rods, sequentially assembling and connecting all the sections of monitoring rods end to end according to the design, simultaneously connecting two adjacent oil pressure annular bags through corresponding oil pipe quick connectors, respectively connecting wires of corresponding stress sensors on the two adjacent sections of monitoring rods in series, and further assembling the surrounding rock stress monitoring equipment.
The step (III) is specifically as follows: after the front end of the conical drill bit is aligned with a drill hole, surrounding rock stress monitoring equipment is slowly fed into the drill hole, contact between the front end of the conical drill bit and the bottom of the drill hole is ensured, then an oil supply valve is opened, hydraulic oil is injected into the oil pressure annular bag through an oil supply port by using an oil pump, so that the hydraulic oil is completely filled in all the oil pressure annular bags, the outer wall of each oil pressure annular bag is ensured to be in close contact with the inner wall of the drill hole, meanwhile, the inner wall of each oil pressure annular bag is respectively in close contact with each corresponding section of monitoring rod, each stress sensor on each section of monitoring rod is respectively in close contact with the inner wall of each corresponding oil pressure annular bag, and then the oil supply valve is closed, so that the oil pump stops injecting the hydraulic oil.
The step (IV) is specifically as follows: and (3) connecting the lead wires of each stress sensor into a data acquisition unit, transmitting the monitored data to the data acquisition unit in real time by each stress sensor, monitoring the oil pressure by the reading of a pressure measuring meter, adjusting the reading of the data acquisition unit, calibrating the corresponding force sensor, and resetting the data acquisition unit to start monitoring after the accuracy is ensured.
Compared with the prior art, the utility model has outstanding substantive characteristics and remarkable progress, and particularly, when the surrounding rock stress monitoring equipment is used for monitoring, the coal rock body applies pressure to the outer wall of the oil pressure annular bag, and the inner wall of the oil pressure annular bag applies pressure to the monitoring rod through hydraulic oil, so that the stress sensor on the monitoring rod can be subjected to the pressure, and the purpose of monitoring the surrounding rock stress is achieved. The monitoring steps are as follows: each section of monitoring rods of surrounding rock stress monitoring equipment are spliced and combined in sequence, two adjacent oil pressure annular bags are connected through corresponding oil pipe quick connectors, wires of corresponding stress sensors on the two adjacent sections of monitoring rods are connected in series respectively, the surrounding rock stress monitoring equipment is assembled, the assembled surrounding rock stress monitoring equipment is sent into a drill hole, hydraulic oil is injected into each oil pressure annular bag through an oil pump, after the hydraulic oil is completely filled into each oil pressure annular bag, the inner wall and the outer wall of each oil pressure annular bag are guaranteed to be in close contact with the monitoring rods and the wall of the drill hole respectively, oil injection is stopped, data acquisition device reading is adjusted according to a pressure measuring meter, and monitoring work can be normally carried out after calibration is completed and zero clearing is carried out.
The utility model has the advantages that the oil pressure annular bag can be in close and seamless contact with the wall of the drilling hole and the stress sensor through the soft characteristic of the shell of the oil pressure annular bag, the stress is monitored through physical change, the anti-interference performance is strong, and the accuracy of monitoring data is improved; the direct contact between the stress sensor and the surrounding rock of the roadway is avoided, the damage rate of the stress sensor is reduced, and the service cycle of the stress sensor is prolonged; after the monitoring is finished, hydraulic oil in the oil pressure annular bag is discharged, and the monitoring rod can be reused after being taken out, so that the cost of monitoring equipment is reduced.
In the process of feeding the surrounding rock stress monitoring equipment into the drilling hole, the conical drill bit can protect the oil pressure annular bag from being damaged, and the surrounding rock stress monitoring equipment is easy to feed into the drilling hole, so that the drilling hole is safe and reliable; the height of the stress sensor is higher than the depth of the groove, so that the stress sensor protrudes out of the groove, and the stress sensor is convenient to contact with the inner wall of the oil pressure annular bag better, and the measurement is more accurate; the arrangement of the circular wire placing groove can prevent the signal transmission from being influenced by the damage of the wire.
Drawings
Fig. 1 is a schematic view of the working state of the present utility model.
Fig. 2 is a schematic view of the surrounding rock stress monitoring device of the present utility model when not assembled.
Fig. 3 is a schematic structural view of the present utility model.
Fig. 4 is a schematic cross-sectional view of the middle of the monitor rod of the present utility model.
Detailed Description
Embodiments of the present utility model are further described below with reference to the accompanying drawings.
As shown in fig. 1-4, a real-time monitoring instrument for dynamic change of surrounding rock stress of a roadway comprises surrounding rock stress monitoring equipment 3 and a data acquisition unit 4, wherein the surrounding rock stress monitoring equipment 3 is correspondingly inserted into a drill hole 2 near the coal wall side of a working surface of the roadway 1, and the surrounding rock stress monitoring equipment 3 is in signal connection with the data acquisition unit 4.
The surrounding rock stress monitoring equipment 3 comprises a plurality of sections of monitoring rods 5, the monitoring rods 5 are horizontally arranged along the front-back direction, the monitoring rods 5 are longitudinally spaced and sequentially connected in a head-to-tail mode, an oil pressure annular bag 6 is sleeved on the monitoring rods 5, the inner wall of the oil pressure annular bag 6 is fixedly bonded with the outer circumference of the monitoring rods 5, the adjacent ends of the two adjacent oil pressure annular bags 6 are fixedly provided with oil pipe quick connectors 7, the adjacent two oil pressure annular bags 6 are connected through the corresponding oil pipe quick connectors 7, the front end of the monitoring rod 5 at the forefront side is fixedly connected with a conical drill bit 8 with a front tip and a rear tip, the rear end face of the conical drill bit 8 is fixedly bonded with the front end of the oil pressure annular bag 6 on the monitoring rod 5 at the forefront side, the stress sensors 9 which are fixedly bonded with four circumferential arrays are arranged on the outer circumference of the middle of the monitoring rod 5 are in contact with the inner wall of the oil pressure annular bag 6, the rear end of the oil pressure annular bag 6 at the rearmost side is fixedly provided with a pressure meter 10 and an oil supply port, the outer end of the oil supply port is provided with a valve 11, and the data collector 4 is respectively connected with each of the corresponding data collector 9 through leads 12.
The monitoring rod 5 is made of metal materials, four grooves arranged in a circumferential array are formed in the outer circumference of the middle of the monitoring rod 5, each stress sensor 9 is correspondingly and adhesively embedded in the corresponding groove, and the height of the stress sensor 9 is higher than the depth of the groove.
The outer circumference of the monitoring rod 5 is provided with circular wire placing grooves 13 for placing the wires 12 along the length direction thereof near each groove.
The length of the monitoring rod 5 is 1-1.2 m, the diameter of the monitoring rod 5 is 30mm, the diameter of the oil pressure annular bag 6 is 60mm, and the maximum diameter of the conical drill bit 8 is the same as the diameter of the oil pressure annular bag 6.
By adopting the technical scheme, the real-time monitoring method for the dynamic change of the roadway surrounding rock stress comprises the following steps:
firstly, drilling holes 2 in the area of a roadway 1 of a working face, which is required to be subjected to surrounding rock stress monitoring;
secondly, assembling surrounding rock stress monitoring equipment 3 according to the depth of the drilling hole 2;
(III) sending the surrounding rock stress monitoring device 3 into the drilling hole 2;
fourthly, connecting the surrounding rock stress monitoring equipment 3 with the data collector 4 in a signal mode, calibrating the surrounding rock stress monitoring equipment, and starting monitoring work;
and fifthly, monitoring the stress change trend and the distribution range of the surrounding rock of the roadway 1 in real time through the data collector 4, pre-warning rock burst through a data result, and timely taking certain pressure relief measures (conventional technologies in the field, including modes of drilling pressure relief, water injection pressure relief and the like) to dynamically treat the surrounding rock of the roadway 1, so that the stability of the surrounding rock of the roadway 1 is ensured, and the occurrence of rock burst is reduced.
The step (I) comprises the following steps: selecting a working face roadway 1 area needing surrounding rock stress monitoring, selecting a proper position on the coal wall side of the roadway 1 near the working face to drill holes 2, and leading the position of the holes 2 to the working face within a range of 40-200 m.
The drill holes 2 in step (one) are specifically arranged as follows: drilling 2 is carried out at a position of the middle part of the tunnel 1 near the coal wall, wherein the depth of the drilling 2 is 3-5 times of the width of the tunnel 1, namely the lateral supporting pressure range of surrounding rock of the tunnel 1 is reached, and the lateral supporting pressure range is particularly 6-15 m, and the drilling is determined by considering geological conditions and mining conditions; the distance between two adjacent drilling holes 2 is 10-15 m, the diameter of each drilling hole 2 is 90-100 mm, the drilling holes 2 drill in the horizontal direction, and no more coal dust is ensured in the drilling holes 2.
The second step is specifically as follows: the length of the surrounding rock stress monitoring equipment 3 is determined according to the depth of the drilled hole 2, a proper number of monitoring rods 5 are selected, all the monitoring rods 5 are assembled and connected end to end in sequence according to the design, two adjacent oil pressure annular bags 6 are connected through corresponding oil pipe quick connectors 7, wires 12 of corresponding stress sensors 9 on the two adjacent monitoring rods 5 are connected in series respectively, and then the surrounding rock stress monitoring equipment 3 is assembled.
The step (III) is specifically as follows: after the front end of the conical drill bit 8 is aligned with the drilling hole 2, the surrounding rock stress monitoring equipment 3 is slowly fed into the drilling hole 2, the front end of the conical drill bit 8 is ensured to be in contact with the bottom of the drilling hole 2, then an oil supply valve 11 is opened, hydraulic oil is injected into the oil pressure annular bags 6 through an oil supply port by an oil pump, all the oil pressure annular bags 6 are completely filled with the hydraulic oil, the outer walls of the oil pressure annular bags 6 are ensured to be in close contact with the inner walls of the drilling hole 2, meanwhile, the inner walls of the oil pressure annular bags 6 are respectively in close contact with the corresponding monitoring rods 5, the stress sensors 9 on the monitoring rods 5 are respectively in close contact with the inner walls of the corresponding oil pressure annular bags 6, and then the oil supply valve 11 is closed, so that the oil pump stops injecting the hydraulic oil.
The step (IV) is specifically as follows: the lead wires 12 of the stress sensors 9 are connected into the data collector 4, the monitored data are transmitted to the data collector 4 in real time by the stress sensors 9, the oil pressure is monitored by the readings of the pressure measuring meter 10, the readings of the data collector 4 are adjusted, the stress sensors 9 are calibrated, and after the accuracy is ensured, the data collector 4 is cleared, and the monitoring work is started.
The data collector 4 and the stress sensor 9 are both conventional technologies, and the specific construction and the working principle are not repeated.
When the surrounding rock stress monitoring equipment 3 is used for monitoring, the coal rock body applies pressure to the outer wall of the oil pressure annular bag 6, and the inner wall of the oil pressure annular bag 6 applies pressure to the monitoring rod 5 through hydraulic oil, so that the stress sensor 9 on the monitoring rod 5 can be subjected to pressure, and the purpose of monitoring the surrounding rock stress is achieved. The monitoring steps are as follows: each section of monitoring rod 5 of the surrounding rock stress monitoring equipment 3 is spliced and combined in sequence, two adjacent oil pressure annular bags 6 are connected through corresponding oil pipe quick connectors 7, wires 12 of corresponding stress sensors 9 on the two adjacent sections of monitoring rods 5 are connected in series respectively, the surrounding rock stress monitoring equipment 3 is assembled, the assembled surrounding rock stress monitoring equipment 3 is sent into a drilling hole 2, hydraulic oil is injected into each oil pressure annular bag 6 by an oil pump, after the hydraulic oil is fully filled into each oil pressure annular bag 6 and the inner wall and the outer wall of each oil pressure annular bag 6 are guaranteed to be in close contact with the monitoring rod 5 and the wall of the drilling hole 2 respectively, oiling is stopped, the data acquisition device 4 is adjusted according to a pressure measuring meter 10, and after calibration is completed and zero clearing is carried out, monitoring work can be normally carried out.
The utility model has the advantages that the oil pressure annular bag 6 can be in close and seamless contact with the wall of the drilling hole 2 and the stress sensor 9 through the soft characteristic of the shell of the oil pressure annular bag 6, the stress is monitored through physical change, the anti-interference performance is strong, and the accuracy of monitoring data is improved; the direct contact between the stress sensor 9 and surrounding rock of the roadway 1 is avoided, the damage rate of the stress sensor 9 is reduced, and the service cycle of the stress sensor 9 is prolonged; after the monitoring is finished, hydraulic oil in the oil pressure annular bag 6 is discharged, and the monitoring rod 5 can be reused after being taken out, so that the cost of monitoring equipment is reduced.
During the process of feeding the surrounding rock stress monitoring equipment 3 into the drilling hole 2, the conical drill bit 8 can protect the oil pressure annular bag 6 from being damaged, and the surrounding rock stress monitoring equipment 3 is easy to feed into the drilling hole 2, so that the drilling hole is safe and reliable; the height of the stress sensor 9 is higher than the depth of the groove, so that the stress sensor 9 protrudes out of the groove, the stress sensor 9 is convenient to contact with the inner wall of the oil pressure annular bag 6 better, and measurement is more accurate; the circular wire placing groove 13 can prevent the wire 12 from being damaged to influence signal transmission.
The above embodiments are merely for illustrating the technical aspects of the present utility model, and it should be understood by those skilled in the art that the present utility model is described in detail with reference to the above embodiments; modifications and equivalents may be made thereto without departing from the spirit and scope of the utility model, which is intended to be encompassed by the claims.
Claims (5)
1. A real-time monitoring instrument for roadway surrounding rock stress dynamic change is characterized in that: the device comprises surrounding rock stress monitoring equipment and a data collector, wherein the surrounding rock stress monitoring equipment is correspondingly inserted into a drill hole near the coal wall side of a working face of a roadway, and the surrounding rock stress monitoring equipment is in signal connection with the data collector.
2. The real-time monitoring instrument for roadway surrounding rock stress dynamic changes according to claim 1, wherein: the surrounding rock stress monitoring equipment comprises a plurality of sections of monitoring rods, the monitoring rods are horizontally arranged in the front-back direction, the monitoring rods are longitudinally spaced and sequentially connected in a head-to-tail mode, an oil pressure annular bag is sleeved on the monitoring rods, the inner wall of the oil pressure annular bag is fixedly bonded with the outer circumference of the monitoring rods, the adjacent ends of the two adjacent oil pressure annular bags are fixedly provided with oil pipe quick connectors, the two adjacent oil pressure annular bags are connected through corresponding oil pipe quick connectors, the front end of the monitoring rod at the forefront side is fixedly connected with a front-to-tip thick conical drill bit, the rear end face of the conical drill bit is fixedly bonded with the front end of the oil pressure annular bag on the monitoring rod at the forefront side, a plurality of stress sensors arranged in a circumferential array are fixedly bonded on the outer circumference of the middle of the monitoring rod, the stress sensors are in contact with the inner wall of the oil pressure annular bag, the rear end of the oil pressure annular bag at the rearmost side is provided with a pressure meter and an oil supply port, the outer end of the oil supply port is provided with an oil supply valve, and the data collector is respectively connected with the stress sensors through lead signals.
3. The real-time monitoring instrument for roadway surrounding rock stress dynamic changes according to claim 2, wherein: the monitoring rod is made of metal materials, a plurality of grooves which are arranged in a circumferential array are formed in the outer circumference of the middle of the monitoring rod, each stress sensor is correspondingly and adhesively embedded in each corresponding groove, and the height of each stress sensor is higher than the depth of each groove.
4. The real-time monitoring instrument for roadway surrounding rock stress dynamic changes according to claim 3, wherein: the outer circumference of the monitoring rod is provided with round wire placing grooves for arranging wires along the length direction of the grooves near the grooves.
5. The real-time monitoring instrument for roadway surrounding rock stress dynamic changes according to any one of claims 2-4, wherein: the length of the monitoring rod is 1-1.2 m, the diameter of the monitoring rod is 30mm, the diameter of the oil pressure annular bag is 60mm, and the maximum diameter of the conical drill bit is the same as the diameter of the oil pressure annular bag.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222427760.3U CN219104226U (en) | 2022-09-14 | 2022-09-14 | Real-time monitoring instrument for roadway surrounding rock stress dynamic change |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222427760.3U CN219104226U (en) | 2022-09-14 | 2022-09-14 | Real-time monitoring instrument for roadway surrounding rock stress dynamic change |
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| CN219104226U true CN219104226U (en) | 2023-05-30 |
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| CN202222427760.3U Active CN219104226U (en) | 2022-09-14 | 2022-09-14 | Real-time monitoring instrument for roadway surrounding rock stress dynamic change |
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