Vertical shaft surrounding rock stability multi-source signal acquisition system and acquisition method

Abstract

The invention provides a vertical shaft surrounding rock stability multi-source signal acquisition device and acquisition method. The vertical shaft surrounding rock stability multi-source signal acquisition device comprises a sensor module, a monitoring module, an optical transceiver module and a display terminal, the sensor module comprises an anchor rod stress meter, a pore water pressure meter and a three-point displacement meter; the monitoring module comprises an NB-IOT low-power module, a power supply module, a time frequency counter and an eight-channel vibrating wire acquisition channel; the sensor module is mounted in a wall body of the surrounding rock of the vertical shaft during signal acquisition; and the NB-IOT low-power module is used for reducing the power consumption of the acquisition device. According to the invention, a plurality of sensors can be adopted to collect shaft surrounding rock signals, the health state of a surrounding rock body can be captured and predicted in time, enough field emergency time and space are reserved for field construction workers, and a powerful guarantee can be provided for safe operation and production of the field workers.

Description

Technical Field

[0001] The invention belongs to the technical field of signal acquisition, and in particular relates to a multi-source signal acquisition system and acquisition method for vertical shaft surrounding rock stability. Background Art

[0002] Minerals are the dominant resources in my country. The development of industry and economy will inevitably lead to an increase in the demand for mineral resources. With the depletion of shallow resources, deep mining has become a trend. Due to the "three highs" of high ground stress, high temperature and high osmotic pressure, the structure and mechanical behavior of rock and minerals have changed, resulting in frequent deep engineering disasters. In addition, the stress field of deep tunnel mining is complex and the stability of its surrounding rock is difficult to control, which has become a gap that must be overcome in the study of deep rock mechanics.

[0003] Now, many new problems such as deep excavation and high complexity are encountered in shaft construction, which poses great challenges to construction operations. In addition, during construction deep in the stratum, there are continuous and thick rock fracture zones, which may induce potential safety risks during excavation. Therefore, it is necessary to monitor the stability of the surrounding rock of deep mines to understand the manifestation laws of the surrounding rock of deep mines, so as to effectively control the stability of the surrounding rock of deep tunnels and ensure the safety of deep mining.

[0004] Traditional monitoring of the stability of the surrounding rock of a vertical shaft usually involves a single monitoring of the surrounding rock pressure or displacement. The surrounding rock signals collected are too simple, and due to the power supply conditions of the site, the traditional signal acquisition device cannot collect data for a long time. Therefore, how to achieve uninterrupted multi-source information collection of the surrounding rock signals of the vertical shaft, timely capture and predict the health status of the surrounding rock body, and reserve sufficient on-site emergency time and space for on-site construction workers is an urgent problem to be solved. Summary of the invention

[0005] The present invention provides a multi-source signal acquisition device and method for the stability of surrounding rock of a vertical shaft. In view of the problems that the surrounding rock signals acquired by traditional monitoring and acquisition of the stability of surrounding rock of a vertical shaft are too single and, due to the limitations of the power supply conditions of the site, the traditional signal acquisition device cannot perform long-term data acquisition. The present invention adopts multiple sensors to collect the surrounding rock signals of the vertical shaft, which can timely capture and predict the health status of the surrounding rock body, reserve sufficient on-site emergency time and space for on-site construction workers, and provide strong guarantee for the safe operation and production of on-site workers.

[0006] In order to achieve the above-mentioned purpose, the technical solution of the present invention is: a system for collecting multi-source signals of the stability of surrounding rock of a shaft, the collection system comprising a sensor module unit, a monitoring module unit, an optical transceiver module unit and a display terminal unit;

[0007] Wherein, the sensor module unit is installed in the surrounding rock wall of the shaft and is used to collect multi-source signals in the shaft in real time;

[0008] The monitoring module unit is used to supply power to the sensor module unit and control the sensor unit to collect data and receive collected data at certain time intervals;

[0009] The optical transceiver module unit is used to control the monitoring module unit and upload the collected data;

[0010] The display terminal unit is used to set the sampling time interval and the sampling times and send them to the monitoring module unit through the optical transceiver module unit, and simultaneously receive the collected multi-source signals.

[0011] Furthermore, the optical transceiver module unit is a QSFP-DD type optical transceiver module.

[0012] Furthermore, before receiving the data display, the display terminal needs to establish a wired communication parameter match with the optical transceiver module through the local area network IP port.

[0013] Further, the sensor module unit includes an anchor stress gauge, a pore water pressure gauge and a three-point displacement gauge;

[0014] Among them, the anchor stress meter is used to collect the stress signal of the surrounding rock of the shaft;

[0015] The pore water pressure meter is used to collect pore water pressure signals of the surrounding rock of the vertical shaft;

[0016] The three-point displacement meter is used to collect displacement signals of the surrounding rock of the shaft.

[0017] Furthermore, the anchor stress gauge adopts a mode of staggered connection of stainless steel pipes and solid steel rods of equal diameter, and the vibrating wire sensing module of the anchor stress gauge is arranged at the stress-bearing end far away from the anchor stress;

[0018] The pore water pressure gauge is a NP-II50 ​​pore water pressure gauge;

[0019] The three-point displacement meter is a WYJ003 three-point displacement meter.

[0020] Furthermore, the monitoring module unit includes a NB-IOT low-power module, a power module, a time-frequency counter and an 8-channel vibrating-string acquisition channel.

[0021] Furthermore, the stress signal includes a horizontal minor principal stress signal, a vertical principal stress signal and a horizontal major principal stress signal.

[0022] Another object of the present invention is to provide a collection method using the collection system described in any one of claims 1 to 7, the collection method specifically comprising the following steps:

[0023] S1) Pre-drilling holes on the surrounding rock wall of the vertical shaft to be monitored;

[0024] S2) Check whether the sensor module unit, the monitoring module unit, the optical transceiver module unit and the display terminal unit are abnormal. If normal, slide the sensor module unit into the borehole and fix and seal it;

[0025] S3) setting the sampling time interval and sampling times through the display terminal to collect signals;

[0026] S4) After the signal acquisition is completed, the engineering staff can query the acquired signal through the display terminal.

[0027] The beneficial effects of the present invention are as follows: compared with the prior art, the present invention uses the NB-IOT low-power module to reduce the power consumption of the acquisition device, improves the service life of the power module, and can realize uninterrupted long-term data acquisition of the acquisition device; the present invention uses multiple sensors to collect signals from the surrounding rock of the shaft, which can timely capture and predict the health status of the surrounding rock body, reserve sufficient on-site emergency time and space for on-site construction workers, and can provide strong guarantees for safe operations and production at the engineering site. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The system structure diagram of a multi-source signal acquisition device for vertical shaft surrounding rock stability of the present invention.

[0029] Figure 2 The present invention is a structural diagram of an anchor stress meter of a multi-source signal acquisition device for the stability of surrounding rock of a vertical shaft.

[0030] Figure 3 This is a schematic diagram of the on-site installation of an anchor stress meter of a multi-source signal acquisition device for the stability of surrounding rock of a vertical shaft according to the present invention.

[0031] Figure 4 This is a schematic diagram of the on-site installation of a pore water pressure meter of a multi-source signal acquisition device for the stability of surrounding rocks of a vertical shaft according to the present invention.

[0032] Figure 5 This is a schematic diagram of the on-site installation of a three-point displacement meter of a multi-source signal acquisition device for the stability of surrounding rock of a vertical shaft according to the present invention.

[0033] Figure 6 It is a schematic diagram of the curve of the surrounding rock stress monitoring point (left side) changing with time of a multi-source signal acquisition device for surrounding rock stability of a vertical shaft according to the present invention.

[0034] Figure 7 It is a schematic diagram of the curve of the surrounding rock stress monitoring point (right side) changing with time of a multi-source signal acquisition device for the surrounding rock stability of a vertical shaft according to the present invention.

[0035] Figure 8 This is a schematic diagram of a curve showing the change of surrounding rock pore water pressure monitoring point (left side) over time in a multi-source signal acquisition device for surrounding rock stability of a vertical shaft according to the present invention.

[0036] Fig. 9 It is a schematic diagram of the curve of the surrounding rock pore water pressure monitoring point (right side) changing with time of a multi-source signal acquisition device for the stability of surrounding rock of a vertical shaft according to the present invention.

[0037] Fig.10 It is a schematic diagram of the curve of the surrounding rock displacement monitoring point (left side) changing with time of a multi-source signal acquisition device for surrounding rock stability of a vertical shaft according to the present invention.

[0038] Fig.11 It is a schematic diagram of the curve of the surrounding rock displacement monitoring point (right side) changing with time of a multi-source signal acquisition device for surrounding rock stability of a vertical shaft according to the present invention.

[0039] In the figure:

[0040] 1. Stainless steel pipe, 2. Solid steel rod, 3. Anchor stress gauge vibrating string sensing module, 4. Signal acquisition device, 5. Anchor stress gauge, 6. Shaft centerline, 7. Shaft wall, 8. Surrounding rock, 9. Anchor stress gauge installation borehole, 10. Pore water pressure gauge installation borehole, 11. Pore water pressure gauge, 12. Three-point displacement gauge installation borehole, 13. Three-point displacement gauge. DETAILED DESCRIPTION

[0041] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the invention.

[0042] In the embodiments of the present invention, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, commodity or device including the element.

[0043] like Figure 1 As shown, in order to achieve the above-mentioned purpose, an embodiment of the present invention provides a system structure diagram of a multi-source signal acquisition device for the stability of surrounding rock of a shaft ( Figure 1 ),Depend on Figure 1 It can be seen that:

[0044] The present invention provides a multi-source signal acquisition device for the stability of surrounding rock of a vertical shaft, comprising a sensor module, a monitoring module, an optical transceiver module and a display terminal; the sensor module comprises an anchor stress gauge, a pore water pressure gauge and a three-point displacement gauge; the monitoring module comprises an NB-IOT low-power module, a power module, a time-frequency counter and an 8-channel vibrating-wire acquisition channel; the sensor module is installed in the surrounding rock wall of the vertical shaft when acquiring signals; the NB-IOT low-power module is used to reduce the power consumption of the acquisition device.

[0045] In this embodiment, the optical transceiver module is a QSFP-DD optical transceiver module.

[0046] In this embodiment, before receiving data display, the display terminal needs to establish wired communication parameter matching with the optical transceiver module through the local area network IP port.

[0047] like Figure 2 As shown, in this embodiment, the anchor stress gauge adopts a mode of staggered connection of stainless steel pipes 1 and solid steel rods 2 of equal diameter, and the vibrating wire sensing module 3 of the anchor stress gauge is arranged at the stress end away from the anchor stress.

[0048] In this embodiment, the pore water pressure gauge is an NP-II50 ​​pore water pressure gauge.

[0049] In this embodiment, the three-point displacement meter is a WYJ003 three-point displacement meter.

[0050] In this embodiment, the anchor stress meter is used to collect stress signals of the surrounding rock of the shaft.

[0051] In this embodiment, the pore water pressure meter is used to collect pore water pressure signals of the surrounding rock of the shaft.

[0052] In this embodiment, the three-point displacement meter is used to collect displacement signals of the surrounding rock of the shaft.

[0053] In this embodiment, the stress signal includes a horizontal minor principal stress signal, a vertical principal stress signal and a horizontal major principal stress signal.

[0054] The present invention also provides a method for collecting multi-source signals of the surrounding rock stability of a shaft, which adopts a multi-source signal collection device for the surrounding rock stability of a shaft as described in any one of the above technical solutions, and comprises the following steps:

[0055] Step 1: Drill holes in advance on the surrounding rock wall of the shaft where signals need to be collected.

[0056] like Figure 3As shown, the anchor stress gauge 5 is communicatively connected with the signal acquisition device 4, the anchor stress gauge 5 is installed on the shaft wall 7, and one anchor stress gauge 5 is installed on each side of the shaft wall 7. During installation, the anchor stress gauge installation borehole 9 has a diameter of 50 mm and a depth of 1 m. Before the anchor stress gauge 5 is filled, an anchoring agent is preferentially inserted into the anchor stress gauge installation borehole 9 to ensure that the anchor stress gauge 5 is tightly coupled with the surrounding rock 8.

[0057] like Figure 4 As shown, the pore water pressure meter 11 is communicatively connected with the signal acquisition device 4, the pore water pressure meter 11 is installed on the wall surface 7 of the vertical shaft, and a pore water pressure meter 11 is installed on each side of the wall surface 7. During installation, the diameter of the osmometer installation borehole 10 is 50 mm, the depth is 2 m, the pore water pressure meter installation borehole 10 is arranged at an angle of 20° to the wall surface 7, and before the pore water pressure meter 11 is filled, an anchoring agent is preferentially inserted into the pore water pressure meter installation borehole 10 to ensure that the pore water pressure meter 11 is tightly coupled with the surrounding rock 8.

[0058] like Figure 5 As shown, the three-point displacement meter 13 is communicatively connected with the signal acquisition device 4, the three-point displacement meter 13 is installed on the wall surface 7 of the vertical shaft, and a three-point displacement meter 13 is installed on each side of the shaft wall surface 7. During installation, the diameter of the three-point displacement meter installation borehole 12 is 50 mm and the depth is 3 m. Before the three-point displacement meter 13 is filled, an anchor is preferentially inserted into the three-point displacement meter installation borehole 12 to ensure that the three-point displacement meter 13 is tightly coupled with the surrounding rock 8.

[0059] Step 2: Check whether the sensor module, monitoring module, optical transceiver module and display terminal are abnormal. If normal, slide the sensor module into the borehole and fix and seal it. After the anchor stress gauge 5 is installed, the anchor stress gauge installation borehole 9 needs to be filled with cement grouting of the same type as the surrounding rock 8 structure; after the pore water pressure gauge 11 is installed, the pore water pressure gauge installation borehole 10 is filled with a mixture of 70% coarse sand and 30% fine sand to half the depth of the pore water pressure gauge installation borehole 10, and the remaining depth is sealed with cement grouting of the same type as the surrounding rock 8 structure; after the three-point displacement meter 13 is installed, the three-point displacement meter installation borehole 12 needs to be filled with cement of the same type as the surrounding rock 8 structure.

[0060] Step 3: Set the sampling time interval and sampling times through the display terminal to collect signals. Set the acquisition mode of the signal acquisition device to automatic acquisition, the power-on cycle to 43200s, which means that the interval is 12 hours for collection, and the power-on duration to 120s, which means that each collection takes 120s. After the collection is completed, the acquisition device automatically shuts down.

[0061] Step 4: After signal acquisition is completed, engineers can query the acquired signals through the display terminal. Figures 6 to 10 As shown in the figure, the signal acquisition results of stress, pore water pressure and displacement on both sides of the surrounding rock of the middle section of the -860m vertical shaft of an underground mine within 100 days.

[0062] Figure 6 and Figure 7 The monitoring results of the anchor stress gauges on the left and right sides of the shaft surrounding rock are shown in Figure 2. The curve trends and data sizes of the two are basically consistent, indicating that the monitoring data is highly reliable. Figure 6 and Figure 7 It can be seen that the horizontal minor principal stress increases rapidly in the first 40 days, slows down after reaching 15 MPa, and finally stabilizes at 60 days, with the value fluctuating around 18 MPa; the vertical principal stress of the shaft surrounding rock increases rapidly in the first 20 days, slows down after reaching 15 MPa, and stabilizes at 60 days, with the value fluctuating around 25 MPa; the horizontal major principal stress increases rapidly in the first 30 days, and then fluctuates greatly until it fluctuates slightly around 33 MPa at 60 days.

[0063] Figure 8 and Fig. 9 The pore water pressure monitoring results on the left and right sides of the vertical shaft surrounding rock can be seen from the figure. The pore water pressure gauges at the two borehole monitoring points continued to increase in the initial stage and reached dynamic stability after 15 days. That is, the monitored pore water pressure count value fluctuated around 0.032MPa, and the seepage water pressure behavior monitored at the two monitoring points was basically the same.

[0064] Fig.10 and Fig.11 The monitoring results of the three-point displacement meter on the left and right sides of the shaft surrounding rock can be seen from the figure. In the early monitoring period, the displacements of monitoring points 1, 2, and 3 of the three-point displacement meter on the left side of the surrounding rock and monitoring points 1′, 2′, and 3′ of the three-point displacement meter on the right side of the surrounding rock increased rapidly; after 10 days of monitoring, the growth trend of the graph gradually slowed down; after 80 days of monitoring, the lateral displacement gradually stabilized. Under the stable state, the lateral displacements of monitoring points 1 and 1′ were the largest, reaching 4.5 mm; monitoring points 2 and 2′ were second, at 4 mm; and monitoring points 3 and 3′ were the smallest, at about 3 mm.

[0065] Depend on Figures 6 to 10 It can be seen that the horizontal major principal stress fluctuates within the range of 33MPa to 40MPa, the horizontal minor principal stress fluctuates within the range of 18MPa to 26MPa, and the vertical principal stress fluctuates within the range of 34MPa to 40MPa; the pore water pressure is basically maintained within the range of 0.01MPa to 0.04MPa; the surrounding rock of the vertical shaft does not exceed 5mm.

[0066] The present invention uses NB-IOT low-power modules to reduce the power consumption of the acquisition device, improves the service life of the power module, and can realize uninterrupted long-term data acquisition of the acquisition device. It also uses multiple sensors to collect signals from the surrounding rock of the shaft, which can timely capture and predict the health status of the surrounding rock mass, and reserve sufficient on-site emergency time and space for on-site construction workers, thus providing strong guarantees for safe operations and production at the engineering site.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A system for collecting multi-source signals of shaft surrounding rock stability, characterized in that: The acquisition system includes a sensor module unit, a monitoring module unit, an optical transceiver module unit and a display terminal unit; Wherein, the sensor module unit is installed in the surrounding rock wall of the shaft and is used to collect multi-source signals in the shaft in real time; The monitoring module unit is used to supply power to the sensor module unit and control the sensor unit to collect data and receive collected data at certain time intervals; The optical transceiver module unit is used to control the monitoring module unit and upload the collected data; The display terminal unit is used to set the sampling time interval and the sampling times and send them to the monitoring module unit through the optical transceiver module unit, and simultaneously receive the collected multi-source signals.

2. The acquisition system according to claim 1, characterized in that: The optical transceiver module unit is a QSFP-DD type optical transceiver module.

3. The acquisition system according to claim 1, characterized in that: Before receiving data display, the display terminal needs to establish wired communication parameter matching with the optical transceiver module through the local area network IP port.

4. The acquisition system according to claim 1, characterized in that: The sensor module unit includes an anchor stress gauge, a pore water pressure gauge and a three-point displacement gauge; Among them, the anchor stress meter is used to collect the stress signal of the surrounding rock of the shaft; The pore water pressure meter is used to collect pore water pressure signals of the surrounding rock of the vertical shaft; The three-point displacement meter is used to collect displacement signals of the surrounding rock of the shaft.

5. The acquisition system according to claim 4, characterized in that: The anchor stress gauge adopts a mode of staggered connection of stainless steel pipes and solid steel rods of equal diameter, and the vibrating wire sensing module of the anchor stress gauge is arranged at the stress-bearing end far away from the anchor stress; The pore water pressure gauge is a NP-II50 ​​pore water pressure gauge; The three-point displacement meter is a WYJ003 three-point displacement meter.

6. The acquisition system according to claim 1, characterized in that: The monitoring module unit includes a NB-IOT low-power module, a power module, a time-frequency counter and an 8-channel vibrating string acquisition channel.

7. The collection device according to claim 4, characterized in that: The stress signal includes a horizontal minor principal stress signal, a vertical principal stress signal and a horizontal major principal stress signal.

8. A collection method using the collection system according to any one of claims 1 to 7, characterized in that: The method specifically comprises the following steps: S1) Pre-drilling holes on the surrounding rock wall of the vertical shaft to be monitored; S2) Check whether the sensor module unit, the monitoring module unit, the optical transceiver module unit and the display terminal unit are abnormal. If normal, slide the sensor module unit into the borehole and fix and seal it; S3) setting the sampling time interval and sampling times through the display terminal to collect signals; S4) After the signal acquisition is completed, the engineering staff can query the acquired signal through the display terminal.

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