CN118243265B - Tunnel surrounding rock partition rupture range testing device and method based on fiber bragg grating - Google Patents
Tunnel surrounding rock partition rupture range testing device and method based on fiber bragg grating Download PDFInfo
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- CN118243265B CN118243265B CN202410118323.4A CN202410118323A CN118243265B CN 118243265 B CN118243265 B CN 118243265B CN 202410118323 A CN202410118323 A CN 202410118323A CN 118243265 B CN118243265 B CN 118243265B
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- 238000012360 testing method Methods 0.000 title claims abstract description 78
- 239000011435 rock Substances 0.000 title claims abstract description 76
- 239000000835 fiber Substances 0.000 title claims abstract description 36
- 238000005192 partition Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000012544 monitoring process Methods 0.000 claims abstract description 230
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- 238000005065 mining Methods 0.000 abstract description 5
- 239000002131 composite material Substances 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 abstract 1
- 238000009662 stress testing Methods 0.000 description 35
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- 229910000831 Steel Inorganic materials 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
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Abstract
本申请涉及采矿技术领域，提供了一种基于光纤光栅的巷道围岩分区破裂范围测试装置及方法。测试装置包括：监测小车和连接杆；监测小车有多个，多个监测小车之间首尾通过连接杆相连，用于对沿应力测试孔轴向的不同监测点位进行监测；多个监测小车之间按照预设角度交错设置，用于在不同的监测点位处对沿应力测试孔径向的不同方位进行监测；其中，每个监测小车上均设置有监测传感器，多个监测传感器并联，且分别通过光纤光栅对监测数据进行传输。籍以，实现了对巷道围岩的一孔多点、多方位的复合监测，提高对巷道围岩分区破裂情况监测的精确性，为精确预测未来围岩破裂规律趋势提供支持。
The present application relates to the field of mining technology, and provides a device and method for testing the fracture range of tunnel surrounding rock partitions based on fiber gratings. The testing device includes: a monitoring trolley and a connecting rod; there are multiple monitoring trolleys, and the multiple monitoring trolleys are connected head to tail by connecting rods, which are used to monitor different monitoring points along the axial direction of the stress test hole; the multiple monitoring trolleys are staggered according to preset angles, and are used to monitor different directions along the radial direction of the stress test hole at different monitoring points; wherein each monitoring trolley is provided with a monitoring sensor, and multiple monitoring sensors are connected in parallel, and the monitoring data are transmitted respectively through fiber gratings. In this way, a one-hole, multi-point, and multi-directional composite monitoring of the tunnel surrounding rock is realized, the accuracy of monitoring the fracture situation of the tunnel surrounding rock partition is improved, and support is provided for the accurate prediction of the future trend of surrounding rock fracture laws.
Description
Technical Field
The application relates to the technical field of mining, in particular to a roadway surrounding rock partition rupture range testing device and method based on fiber gratings.
Background
After underground engineering is excavated, the original stress balance state of the deep surrounding rock is broken, the surrounding rock is in different stress states due to stress redistribution, different damage forms are generated, and finally partition cracking is caused. In the process, sudden natural disasters such as rock burst, large-area surrounding rock collapse and the like are often accompanied, and the safety of deep underground engineering is greatly threatened. Meanwhile, with the follow-up tunnel excavation and other works, under the action of high ground stress, the partition fracture condition in the surrounding rock is not kept unchanged, but is changed continuously with the redistribution of stress. Therefore, the regional cracking range and the degree of the surrounding rock inside the tunnel excavation are ascertained, the dynamic change of regional cracking of the surrounding rock is timely and effectively predicted by combining the monitoring data, and the method has important safety significance and practical application value for selecting a proper supporting mode and timely and dynamically and effectively adjusting the supporting mode.
Disclosure of Invention
The application aims to provide a roadway surrounding rock partition rupture range testing device and method based on fiber gratings, so as to solve or alleviate the problems in the prior art.
In order to achieve the above object, the present application provides the following technical solutions:
the application provides a roadway surrounding rock partition rupture range testing device based on fiber gratings, wherein stress testing holes are formed in roadway surrounding rock along the radial direction, the testing device can penetrate into the stress testing holes, and the testing device comprises: a monitoring trolley and a connecting rod; the monitoring trolleys are connected end to end through the connecting rods and used for monitoring different monitoring points along the axial direction of the stress testing hole; the monitoring trolleys are staggered according to a preset angle and used for monitoring different directions along the radial direction of the stress testing hole at different monitoring point positions; each monitoring trolley is provided with a monitoring sensor, a plurality of monitoring sensors are connected in parallel, and monitoring data are transmitted through fiber gratings respectively.
Preferably, the monitoring trolley comprises: monitoring a vehicle body, a contact platform and contact rollers; the monitoring sensor is arranged on the monitoring vehicle body; the contact roller is arranged on the contact platform, and the contact platform is connected to the top end of the monitoring vehicle body along the vertical direction through an electric push rod; the electric push rod can drive the contact platform to move along the vertical direction, so that the contact roller abuts against the hole wall of the stress test hole.
Preferably, the number of the contact rollers is at least 2, and at least 2 contact rollers are uniformly distributed along the length direction of the monitoring vehicle body and positioned on the symmetrical middle plane of the width direction of the monitoring vehicle body.
Preferably, the number of the electric push rods is 2, and the number of the electric push rods is 2, so that the electric push rods are uniformly distributed along the length direction of the monitoring vehicle body and are positioned on the symmetrical middle plane of the width direction of the monitoring vehicle body.
Preferably, the top surface of the monitoring vehicle body is provided with a plurality of guide holes along the vertical direction; correspondingly, a plurality of guide posts are arranged on the bottom surface of the contact platform along the vertical direction; the guide posts are respectively sleeved in the guide holes in a one-to-one sliding mode.
Preferably, compression springs are sleeved outside the guide posts and the guide holes which are correspondingly arranged; and two ends of the compression spring are respectively abutted against the top surface of the monitoring vehicle body and the bottom surface of the contact platform.
Preferably, the monitoring vehicle body is provided with a mounting groove, and the monitoring sensor is mounted in the mounting groove; and the bottom surface of the mounting groove is provided with a wire passing hole leading to the rear end surface of the monitoring vehicle body.
Preferably, two ends of the monitoring vehicle body are respectively provided with a connecting boss along the length direction of the monitoring vehicle body, the outer side wall of the connecting boss is provided with a first external thread, and a plurality of positioning holes are arranged along the axial direction of the connecting boss; correspondingly, positioning columns are arranged at two ends of the connecting rod along the axial direction, and second external threads are arranged on the outer side walls of the end parts of the connecting rod; the positioning column is matched with the positioning hole, and the second external thread is matched with the first external thread.
Preferably, the connecting rod is a hollow structure along the axial direction.
The embodiment of the application also provides a method for testing the zone rupture range of the surrounding rock of the roadway based on the fiber bragg grating, which monitors the zone rupture range of the surrounding rock of the roadway by adopting any one of the device for testing the zone rupture range of the surrounding rock of the roadway based on the fiber bragg grating, and comprises the following steps: arranging a plurality of monitoring sections along the trend of a roadway, wherein a plurality of stress testing holes are formed in each monitoring section along the circumferential direction, each stress testing hole extends along the radial direction of surrounding rock of the roadway, and a plurality of monitoring points are arranged in each stress testing hole along the depth direction; the forefront monitoring section is positioned at the position 20m behind the tunneling head; after drilling of each stress test hole is completed, circularly cleaning, and discharging impurities in the holes; connecting a plurality of monitoring trolleys end to end through connecting rods, and arranging the plurality of monitoring trolleys in a staggered manner according to preset angles so as to monitor different positions along the radial direction of the stress test hole at different monitoring point positions; each monitoring trolley is provided with a monitoring sensor, a plurality of monitoring sensors are connected in parallel, and monitoring data are transmitted through fiber gratings respectively; and sending the connected multiple testing devices into different stress testing holes respectively, wherein the multiple monitoring trolleys of the testing devices in each stress testing hole are respectively positioned at multiple different monitoring points of the stress testing holes.
The beneficial effects are that:
The device for testing the regional fracture range of the surrounding rock of the roadway based on the fiber bragg grating is arranged in the stress testing holes arranged on the surrounding rock of the roadway along the radial direction, and the testing device penetrates into the stress testing holes so as to monitor the regional fracture of the surrounding rock of the roadway. In the testing device, a plurality of monitoring trolleys are connected end to end through connecting rods and used for monitoring different monitoring points along the axial direction of the stress testing hole; the plurality of monitoring trolleys are arranged in a staggered mode according to a preset angle and used for monitoring different radial directions of the stress testing holes at different monitoring point positions. Wherein, all be provided with monitoring sensor on every monitoring dolly, a plurality of monitoring sensor parallel arrangement just transmit monitoring data through fiber bragg grating respectively.
By the method, the partition fracture conditions at different depths in the stress test hole are monitored by a plurality of monitoring trolleys provided with monitoring sensors; the staggered arrangement of the plurality of monitoring trolleys is utilized to monitor the partition fracture conditions of different directions in the stress test hole, so that one-hole multi-point and multi-azimuth compound monitoring of the surrounding rock of the roadway is realized, the accuracy of monitoring the partition fracture conditions of the surrounding rock of the roadway is improved, and support is provided for accurately predicting future surrounding rock fracture rule trends; meanwhile, the monitoring sensors arranged in parallel perform monitoring data transmission through the fiber bragg gratings, so that the environment interference is effectively avoided, high-precision accurate monitoring is realized, more reliable reference basis is provided for roadway support, and the safety and efficiency of mining engineering are improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. Wherein:
FIG. 1 is a schematic illustration of an arrangement of stress test holes provided in accordance with some embodiments of the present application;
fig. 2 is a schematic structural diagram of a device for testing a zone rupture range of surrounding rock of a roadway based on fiber gratings according to some embodiments of the present application;
FIG. 3 is a schematic illustration of an assembly of a monitoring cart with a connecting rod provided in accordance with some embodiments of the present application;
FIG. 4 is a side view of a monitoring cart provided in accordance with some embodiments of the application;
fig. 5 is a schematic structural view of a connecting rod according to some embodiments of the present application.
Reference numerals illustrate:
1. Monitoring a trolley; 2. a connecting rod;
101. monitoring a vehicle body; 102. a contact platform; 103. a contact roller; 104. an electric push rod; 105. a guide hole; 106. a guide post; 107. a mounting groove; 108. sealing the cover plate; 109. a wire through hole; 110. monitoring a sensor; 111. positioning holes; 201. positioning columns; 202. and (5) locking the nut.
Detailed Description
The application will be described in detail below with reference to the drawings in connection with embodiments. The examples are provided by way of explanation of the application and not limitation of the application. Indeed, it will be apparent to those skilled in the art that modifications and variations can be made in the present application without departing from the scope or spirit of the application. For example, features illustrated or described as part of one embodiment can be used on another embodiment to yield still a further embodiment. Accordingly, it is intended that the present application encompass such modifications and variations as fall within the scope of the appended claims and their equivalents.
The monitoring of stress distribution conditions at all depths in the surrounding rock of the roadway is an effective method for judging the cracking conditions of the surrounding rock at all depths, and in general, the stress borne by the surrounding rock of the complete area is larger, and the stress borne by the surrounding rock of the broken area is smaller. At present, most of the adopted stress monitoring devices are capacitive pressure sensors and the like, and the stress or strain signals are required to be converted into electric signals and then transmitted to devices of external storage and collection equipment. Such single monitoring means, such as piezoresistive pressure sensors or capacitive pressure sensors, often result in inaccurate or invalid data due to defects, inadequacies or factors considered in themselves, so that the monitoring effect is not as expected and the monitoring reliability is poor. For example, the device is easily influenced by surrounding environment factors, the wet environment is extremely easy to cause short circuit of the electric signal to cause signal transmission failure, and meanwhile, the device is inevitably interfered by other magnetic fields in the surrounding environment in the monitoring process, so that the reliability of electric signal transmission is greatly influenced.
Based on the above, the application provides a fiber grating-based roadway surrounding rock partition rupture range testing device for monitoring the partition rupture condition of roadway surrounding rock in real time, wherein as shown in fig. 1, stress testing holes are radially formed in the roadway surrounding rock, the testing device is deeply installed in the stress testing holes, and the partition rupture condition of the surrounding rock at a monitoring section is monitored in real time.
In the application, a plurality of monitoring sections are arranged along the trend of the roadway, wherein the forefront monitoring section is positioned at the position 20m behind the tunneling head, then one monitoring section is arranged at each interval 20m, and the monitoring sections are dynamically and forwards adjusted in real time along with the tunneling work of the roadway. At each monitoring section, a plurality of stress test holes are arranged along the circumferential direction of the roadway. Specifically, at each monitoring section, 5 stress test holes were arranged, the drilled diameter was 40mm, and the depth was 10m. Wherein, 5 stress test holes are evenly distributed in a range of 180 degrees above the middle surface of the roadway and are respectively positioned at the top plate, the left and right top shoulders and the left and right sides.
And arranging a plurality of monitoring points in each stress testing hole along the depth direction, specifically, arranging one monitoring point every 1m from the surface of the roadway to determine the change rule of stress at different depths. The number and the interval of the monitoring points in one stress testing hole are determined according to the actual requirement of the surrounding rock of the roadway so as to cover the key area of the surrounding rock of the whole roadway to the greatest extent.
As shown in fig. 2 to 5, the test device placed in each stress test hole includes: a monitoring trolley 1 and a connecting rod 2. The monitoring trolleys 1 are connected end to end through connecting rods 2 and used for monitoring different monitoring points in the axial direction of the stress testing hole; the plurality of monitoring trolleys 1 in the same stress testing hole are staggered according to a preset angle and are used for monitoring different positions along the radial direction of the stress testing hole at different monitoring points; each monitoring trolley 1 is provided with a monitoring sensor 110, a plurality of monitoring sensors 110 are connected in parallel, and monitoring data are transmitted through fiber gratings respectively.
By means of the serial connection of the plurality of monitoring trolleys 1, stress distribution conditions at different depths of the stress detection holes are monitored in real time; through the staggered arrangement among the plurality of monitoring trolleys 1, the stress distribution conditions of the radial different azimuth positions along the stress test holes are monitored, the multi-point and multi-azimuth compound monitoring of one hole of the surrounding rock of the roadway is realized, and the monitoring of the regional fracture condition of the surrounding rock of the roadway is more accurate. Meanwhile, the plurality of monitoring sensors 110 are arranged in parallel through the fiber bragg gratings, so that the monitoring data are transmitted, the environmental interference is effectively avoided, the high-precision accurate monitoring is realized, more reliable reference bases are provided for roadway support, and the safety and the efficiency of mining engineering are improved.
In the present application, the monitoring cart 1 includes: the body 101, the contact platform 102 and the contact roller 103 are monitored. A monitoring sensor 110 is arranged on the monitoring vehicle body 101, a contact roller 103 is mounted on a contact platform 102, and the contact platform 102 is connected to the top end of the monitoring vehicle body 101 in the vertical direction through an electric push rod 104. The electric push rod 104 can drive the contact platform 102 to move along the vertical direction, so that the contact roller 103 abuts against the wall of the stress test hole. Specifically, when the monitoring device is sent inwards from the hole opening of the stress detection hole, the electric push rods 104 do not work until the monitoring trolley 1 at the head is sent to a preset monitoring point, the electric push rods 104 on each monitoring trolley 1 start to work, the contact platform 102 is pushed to move along the radial direction of the stress detection hole until the contact roller 103 on the contact platform 102 abuts against the hole wall of the stress detection hole, and the action of the electric push rods 104 is stopped. The contact platform 102 and the monitoring trolley 1 form a rigid connection through the electric push rod 104, so that the surrounding rock change can be directly transmitted to the monitoring sensor 110 on the monitoring trolley 1 through the contact roller 103.
In the application, the contact roller 103 is rotatably mounted on the contact platform 102, and the contact roller 103 is a steel roller, so that when the contact roller 103 abuts against the inner wall of the stress test hole, the change of the surrounding rock can be directly and timely transmitted through the contact roller 103. In a specific example, at least 2 contact rollers 103 are provided, and at least 2 contact rollers 103 are uniformly distributed along the length direction of the monitor body 101 and are located on the symmetrical middle plane of the width direction of the monitor body 101. The multipoint contact monitoring of the same monitoring point position is realized through the contact of at least 2 contact rollers 103 with the stress test holes, and the precision of monitoring the change of surrounding rock is improved; the at least 2 contact rollers 103 are located on the symmetrical middle plane of the width direction of the monitoring vehicle body 101, so that after the plurality of monitoring trolleys 1 are arranged in a staggered mode, the monitoring angle between the contact rollers 103 on each monitoring trolley 1 along the circumferential direction of the stress testing hole is effectively controlled.
In the application, 2 electric pushers 104 are arranged, and 2 electric pushers 104 are uniformly distributed along the length direction of the monitoring vehicle body 101 and positioned on the symmetrical middle plane of the width direction of the monitoring vehicle body 101. By this, make after contact roller 103 supports tightly with the inner wall in stress test hole, the country rock change can be through electric putter 104 along monitoring the monitoring sensor 110 on the automobile body 101 of the symmetry mid-plane transmission of the width direction of automobile body 101, effectively improve the monitoring accuracy of country rock change.
Further, a plurality of guide holes 105 are formed in the top surface of the monitoring vehicle body 101 along the vertical direction, and a plurality of guide posts 106 are correspondingly formed in the bottom surface of the contact platform 102 along the vertical direction, and the plurality of guide posts 106 are respectively slidably sleeved in the plurality of guide holes 105 one by one. The motion accuracy of the contact platform is effectively improved under the action of the electric push rod 104, and the contact roller 103 can be abutted with the inner wall of the stress testing hole along the determined direction.
Compression springs are sleeved outside the guide posts 106 and the guide holes 105 which are correspondingly arranged, and two ends of each compression spring are respectively abutted against the top surface of the monitoring vehicle body 101 and the bottom surface of the contact platform 102. When the testing device is sent into the stress testing hole, the electric push rod 104 does not work, and the contact platform 102 moves under the action of the compression spring (the movement stroke is limited by the electric push rod 104), so that the contact roller 103 is in contact with the stress testing hole; after the monitoring trolley 1 is sent to a preset monitoring point, the electric push rod 104 is started, the contact roller 103 is tightly propped against the inner side wall of the stress detection hole, a rigid structure is formed between the contact platform 102 and the monitoring vehicle body 101, and the contact roller 103 is changed into a monitoring sensor 110 for effectively transmitting the change of surrounding rock to the monitoring vehicle body 101.
In the present application, the monitoring sensor 110 is attached to the monitoring vehicle body 101. Specifically, an installation groove 107 is formed in the monitoring vehicle body 101, a monitoring sensor 110 is adhered to the inside of the installation groove 107, specifically, the monitoring sensor 110 can be adhered to the side wall or the bottom of the installation groove 107, and a wire passing hole 109 leading to the rear end face of the monitoring vehicle body 101 is formed in the bottom face of the installation groove 107. The wire passing hole 109 penetrates through the whole monitoring trolley 1 along the length direction of the monitoring trolley 1, meanwhile, the connecting rod 2 is of a hollow structure along the axial direction, the fiber bragg grating penetrates into the hollow structure of the connecting rod 2 after coming out of the wire passing hole 109 on the monitoring trolley 1, then penetrates into the wire passing hole 109 of the rear monitoring trolley 1, circulates in sequence, and is connected with data acquisition and analysis equipment outside the stress testing hole after coming out of the wire passing hole 109 of the last monitoring trolley 1 (close to the surface of the stress testing hole).
A stepped counter bore is further formed in the upper portion of the mounting groove 107 of the monitoring vehicle body 101, the side wall of the stepped counter bore is an internal thread, and after the monitoring sensor 110 is stuck in the mounting groove 107, the mounting groove 107 can be sealed through the sealing cover plate 108. Specifically, the mounting groove 107 is sealed by threaded connection between the sealing cover plate 108 and the stepped counterbore.
In a specific example, along the length direction of the monitoring vehicle body 101, connection bosses are respectively arranged at two ends of the monitoring vehicle body 101, first external threads are arranged on the outer side wall of the connection bosses, and a plurality of positioning holes 111 are arranged along the circumferential direction of the connection bosses; correspondingly, positioning columns 201 are arranged at two ends of the connecting rod 2 along the axial direction, and second external threads are arranged on the outer side walls of the end parts of the connecting rod 2. Wherein, the positioning column 201 is matched with the positioning hole 111, and the second external thread is matched with the first external thread.
The positioning columns 201 are inserted into the positioning holes 111 in different directions on the connecting boss, so that staggered arrangement among different monitoring trolleys 1 is realized. For example, the positioning column 201 at the front end of the connecting rod 2 is inserted into the positioning hole 111 at an angle of 15 ° on the connecting boss at the rear end of the monitoring trolley 1 at the front end, and the positioning column 201 at the rear end of the connecting rod 2 is inserted into the positioning hole 111 at an angle of 45 ° on the connecting boss at the front end of the monitoring trolley 1 at the rear end, so that the monitoring of different directions in the stress testing hole can be realized by arranging the monitoring trolleys 1 at the two ends of the connecting rod 2 at intervals of 30 °.
In the application, 2 positioning columns 201 at the end part of the connecting rod 2 are arranged, and the 2 positioning columns 201 are simultaneously inserted into the corresponding positioning holes 111 to perform circumferential limit on the monitoring trolley 1 or the connecting rod 2, so that the connection stability between the monitoring trolley 1 and the connecting rod 2 is effectively improved. Meanwhile, after the positioning column 201 is inserted into the positioning hole 111, the locking nut 202 at the end part of the connecting rod 2 is rotated to rotate towards the connecting boss direction of the monitoring trolley 1 and is in threaded connection with the first external thread and the second external thread, so that the fixed connection between the monitoring trolley 1 and the connecting rod 2 is realized.
Thereby, the partition fracture condition at different depths in the stress test hole is monitored by the plurality of monitoring trolleys 1 provided with the monitoring sensors 110; the staggered arrangement of the plurality of monitoring trolleys 1 is utilized to monitor the partition fracture conditions of different directions in the stress test hole, so that one-hole multi-point and multi-azimuth compound monitoring of the surrounding rock of the roadway is realized, the accuracy of monitoring the partition fracture conditions of the surrounding rock of the roadway is improved, and support is provided for accurately predicting future surrounding rock fracture rule trends; meanwhile, the monitoring sensors 110 arranged in parallel perform monitoring data transmission through the fiber bragg gratings, so that the environment interference is effectively avoided, high-precision accurate monitoring is realized, more reliable reference basis is provided for roadway support, and the safety and efficiency of mining engineering are improved.
In the application, the monitoring sensor 110 adopts the fiber bragg grating stress tester, realizes the function of the sensor by controlling the light transmission, measures the tiny stress change of the surrounding rock of the roadway accurately in real time, and transmits the tiny stress change in the form of an optical signal, so that the acquisition and analysis of data are more accurate and efficient, and compared with an electronic sensor, the sensor has higher electromagnetic interference resistance and better stability and reliability. When the temperature, stress, strain or other physical quantity of the environment where the fiber grating is located changes, the period or the refractive index of the fiber core of the grating changes under the action of external physical quantity, so that the wavelength of reflected light changes, and the stress change condition of surrounding rock can be obtained by measuring the change of the wavelength of reflected light before and after the physical quantity changes.
When the fiber grating-based roadway surrounding rock partition rupture range testing device is used for monitoring the roadway surrounding rock partition rupture range, firstly, a plurality of monitoring sections are arranged along the roadway trend, a plurality of stress testing holes are formed in each monitoring section along the circumferential direction, each stress testing hole extends along the radial direction of the roadway surrounding rock, and a plurality of monitoring points are arranged in each stress testing hole along the depth direction; wherein the forefront monitoring section is positioned at the position 20m behind the tunneling head; and after drilling of each stress test hole is completed, washing with clear water circularly, and discharging impurities in the hole until the water is clear. Then, blow air into the stress test hole, discharge the gas in the borehole, prevent the gas explosion disaster from happening.
Then, link up through connecting rod 2 head and tail between a plurality of monitoring dolly 1, and set up crisscross according to predetermineeing the angle between a plurality of monitoring dolly 1 to monitor along the radial different positions of stress test hole in different monitoring point positions. And finally, the connected multiple testing devices are respectively sent into different stress testing holes, and the multiple monitoring trolleys 1 of the testing device in each stress testing hole are respectively positioned at multiple different monitoring points of the stress testing hole, so that one-hole multipoint and multidirectional compound monitoring of the roadway surrounding rock is realized.
Each monitoring trolley 1 is provided with a monitoring sensor 110, a plurality of monitoring sensors 110 are connected in parallel, monitoring data are transmitted through fiber gratings respectively, and time corresponding to surrounding rock change conditions at different depths of stress testing holes is recorded. The collected stress data is transmitted to a data analysis system outside the stress test hole in real time through the fiber bragg grating, and the data analysis system performs operations such as data filtering and feature extraction to obtain the spatial distribution of surrounding rock stress. And determining the fracture partition range of the roadway surrounding rock based on indexes such as stress change trend, peak stress and the like of the roadway surrounding rock, and visually displaying the fracture partition range through a display device. Meanwhile, the collected monitoring data can be stored, backed up and managed to analyze the roadway for a long time, so that the cracking rule and trend of surrounding rock of the roadway are obtained, and a reference is provided for subsequent roadway support.
When the testing device is used for testing the regional fracture condition of the surrounding rock of the roadway, one-hole multi-point and multi-azimuth stress monitoring can be realized, the testing precision, the reliability and the sensitivity are higher, the fracture range of the surrounding rock can be monitored in real time, scientific basis is provided for the formulation and adjustment of a roadway support scheme, the safety and the stability of the roadway are improved, the probability of accidents is reduced, and the engineering risk and loss are reduced.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (9)
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410118323.4A CN118243265B (en) | 2024-01-29 | 2024-01-29 | Tunnel surrounding rock partition rupture range testing device and method based on fiber bragg grating |
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| CN202410118323.4A CN118243265B (en) | 2024-01-29 | 2024-01-29 | Tunnel surrounding rock partition rupture range testing device and method based on fiber bragg grating |
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| CN118243265A CN118243265A (en) | 2024-06-25 |
| CN118243265B true CN118243265B (en) | 2024-11-08 |
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| CN116773772A (en) * | 2023-06-05 | 2023-09-19 | 中国国家铁路集团有限公司 | A surrounding rock relaxation area testing method, calculation method and related equipment |
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| CN116773772A (en) * | 2023-06-05 | 2023-09-19 | 中国国家铁路集团有限公司 | A surrounding rock relaxation area testing method, calculation method and related equipment |
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