CN113029095B - Coal mine earth surface wide area high-precision online settlement monitoring method - Google Patents
Coal mine earth surface wide area high-precision online settlement monitoring method Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C5/00—Measuring height; Measuring distances transverse to line of sight; Levelling between separated points; Surveyors' levels
- G01C5/04—Hydrostatic levelling, i.e. by flexibly interconnected liquid containers at separated points
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C25/00—Manufacturing, calibrating, cleaning, or repairing instruments or devices referred to in the other groups of this subclass
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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- Y02A90/30—Assessment of water resources
Abstract
The invention discloses a coal mine earth surface wide area high-precision online settlement monitoring method, which comprises the following steps: s1, determining the positions of detection points on a detection area, then sequentially determining the positions of a working base point and a reference point, respectively building a monitoring pier on the working base point and the reference point, wherein the number of the detection areas is at least three, the number of the working base points is at least two, and each monitoring pier is respectively provided with a GNSS receiver; and S2, respectively installing a static leveling instrument on each detection point and each work base point. According to the distribution condition of the area to be detected, the working base points capable of monitoring all the detection points in the area at the same time are arranged at the corresponding positions of the area to be detected, the working base points are used as GNSS reference points to monitor deformation of the detection points in the area to be detected, and the reference points are used for monitoring all the working base points in real time to realize step-by-step monitoring of the detection points, so that the coverage range of the monitoring system for the detection points is expanded.
Description
Technical Field
The invention relates to the technical field of settlement monitoring, in particular to a coal mine earth surface wide-area high-precision online settlement monitoring method.
Background
The prior art can not directly realize the high-precision online settlement monitoring. In practical cases, the prior art can be adopted to achieve wide-area or high-precision online settlement monitoring.
1. The mainstream technology is monitoring by using GNSS.
Related research on deformation monitoring of a deformable body by adopting a GNSS technology is early carried out abroad, and Bock Y proposes to adopt a GPS technology for surface deformation monitoring in 1986. Subsequently, Steven R L monitored the deformation of the crust using GPS and obtained the speed of movement of the plaque (9 mm/yr). James F M proposes that the deformation of the natural gas pipeline is monitored by adopting the GPS technology, and the monitoring precision of a sub-centimeter level is obtained. The Deloach SR carries out continuous deformation monitoring based on the GPS technology, and obtains a relatively ideal result. With the development of the GNSS dynamic positioning technology, attention is paid to and the technology is developed in the fields of structure monitoring, automatic monitoring and the like, and related data processing theories are continuously appeared and perfected.
The research in this aspect in China is basically synchronous with foreign countries, and it is argued that in 1989, GPS is adopted to monitor the vertical movement of the earth surface, and prospective discussion is made on main influence errors. In the same year, the Canada Mactaquac dam is taken as an example for Chengyongqi, the basic requirements and monitoring contents for deformation monitoring by comprehensively utilizing technologies such as a GPS, a total station and photogrammetry are explained, and a guiding case is provided for the application of the GPS in the field of deformation monitoring. The GPS technology of the Lixuan navigation can meet the requirement of monitoring the deformation of the dam. It was earlier proposed to use GPS to monitor high-rise buildings. Zhengguo firstly proposes that the GPS is used for monitoring the slope deformation of the strip mine, and by taking the Jinchuan strip mine as an example, the system explains key problems of datum point selection, deformation network layout, GNSS data acquisition, processing, quality control, coordinate system conversion and the like, and provides valuable reference for the application of the GNSS to mine deformation.
At present, the deformation monitoring of the coal mine ground surface by adopting the traditional technology obtains rich practical experience, and a large amount of historical data is accumulated; wide area online settlement monitoring is a very important development trend. The system consists of structures such as data acquisition, data wireless or wired transmission, data analysis and processing and the like, is timely transmitted to a terminal by GNSS real-time dynamic monitoring and radio transmission technology, develops data processing and analyzing software by a geographic information system, and dynamically analyzes a deformation result in real time, so that the current situation, the law and the development trend of deformation are analyzed, and a reliable scientific basis is provided for realizing disaster prevention and reduction. However, since the GNSS reference point is mostly set to be one and only can monitor the detection points within a certain range in real time, the monitoring system cannot monitor the detection points with a long distance, which affects the monitoring effect of the monitoring system, and since each detection point has a long distance from the reference point, the GNSS reference point will be affected on the reception of signals transmitted from each detection point, which affects the stability of the monitoring system.
2. High-precision static level gauge based on online monitoring technology
The pressure measuring cavity of the static level gauge is connected in series to the liquid level container through a liquid through pipe, is measured by a high-precision silicon crystal core sensor, is transmitted to a signal acquisition system through signals, is transmitted to the signal acquisition system through signal change in the pressure monitoring process, and is synchronously changed along with the change of pressure measurement through analysis and calculation, so that the pressure change of each measuring point is measured, and the relative settlement height of the earth surface is analyzed. Currently, the precision can reach 0.1mm at most.
The two mainstream technologies and independent application of the system can only solve the problem of wide area or high precision independently, but cannot give consideration to both wide area and high precision.
Disclosure of Invention
1. Technical problem to be solved
The invention aims to provide a coal mine earth surface wide area high-precision online settlement monitoring method to solve the problems in the background technology.
2. Technical scheme
In order to solve the problems, the invention adopts the following technical scheme:
the wide-area high-precision online settlement monitoring method comprises the following steps:
s1, determining the positions of detection points on a detection area, then sequentially determining the positions of a working base point and a reference point, respectively building a monitoring pier on the working base point and the reference point, wherein the number of the detection areas is at least three, the number of the working base points is at least two, and each monitoring pier is respectively provided with a GNSS receiver;
s2, respectively installing a hydrostatic level gauge on each detection point and each working base point;
s3, mounting a reference liquid storage tank required by the detection point on each detection area on a monitoring pier of a nearby working base point, wherein each working base point is connected with at least one detection point on one detection area through a signal cable;
s4, connecting the static level gauge on one detection point in each detection area to the reference liquid storage tank on the corresponding working base point by using a liquid guide pipe and an air guide pipe;
s5, connecting each of the work base points to the reference point by a signal cable.
Preferably, at least two detection points are determined on each detection area, all the detection points on each detection area are connected in parallel through signal cables, and all the detection points on each detection area share one liquid guide pipe and one air guide pipe.
Preferably, each of the liquid guide pipe and the air guide pipe is sleeved with a PVC pipe capable of protecting the liquid guide pipe and the air guide pipe.
Preferably, each hydrostatic level is internally provided with a high-precision silicon pressure sensor, and a liquid medium is filled between the reference liquid storage tank and the sensor.
Preferably, the hydrostatic level on each of the work base points coincides with a mounting position of the GNSS receiver.
Preferably, the reference point is constructed according to the standard of a B-level measurement control point.
Preferably, the installation of the hydrostatic level described in S2 includes the steps of:
measuring the elevation of each settlement detection point, determining the installation position of the settlement observation point according to elevation data, wherein the observation point connected with the same connecting pipe is approximately horizontal, and a groove is dug between each settlement detection point for embedding a communicating pipe; simultaneously preparing a wrench, a thread seal tape, a liquid medium injection tool, a liquid, an air pipe, an antifreeze liquid with a freezing point of-25 ℃ and made of dimethyl silicone oil, an air pipe joint, purified water, a PVC steel wire hose, a reading instrument and a horizontal ruler, wherein the antifreeze liquid and the purified water are prepared according to a ratio of 3: 1;
secondly, shearing liquid and air pipes with proper lengths according to the distance between detection points, sleeving the liquid and air pipes with steel wire hoses, wrapping ports of the liquid pipe and the air pipes with raw material belts, installing the ports of the liquid pipe on a liquid port of a liquid level settlement gauge by using a joint, and sealing a gas port and a tail end liquid port of the liquid level settlement gauge by using a plug;
inputting the mixed antifreeze into a liquid pipe and an air pipe, opening air ports of settlement gauges at the head end and the tail end to form a height difference when inputting the antifreeze, filling the prepared antifreeze into a liquid conveying port at the head end of the high-end settlement gauge, exhausting the air at the other end, filling the antifreeze from a selected end only when inputting the antifreeze, otherwise, not exhausting the air in the communicating pipe, simultaneously putting the liquid level settlement gauge and the liquid pipe into a mounting hole and a groove after filling a proper amount of antifreeze, fixing the liquid level settlement gauge by using a foundation bolt, determining the level of the liquid level settlement gauge and the liquid pipe by using a level ruler when mounting the liquid level settlement gauge and the liquid pipe, opening the air ports of other liquid level settlement gauges, and pouring a proper amount of silicone oil on the liquid level surface to prevent the evaporation of liquid water and air;
reading the readings of the liquid level settlement meters by using a reading instrument, judging whether the liquid level settlement meters are in required proper positions or not, when the liquid levels of the liquid level settlement meters at the reference point and the settlement detection points float to the middle value of the full range, if the reference point is slightly lower than about 30 percent of the full range of the settlement observation points, only enabling the liquid levels of the liquid level settlement meters at the settlement observation points to float to about 15 percent of the middle value of the full range, and at the moment, the reference point is higher than about 15 percent of the middle value, and if the liquid levels of the liquid level settlement meters are insufficient, continuously adding antifreeze until the liquid levels can reach the required liquid levels;
after liquid adding is finished, installing the port of the air pipe on the air port of the liquid level settlement gauge by using a connector, then sealing the air port of the head end liquid level settlement gauge, the infusion port and the air port of the tail end liquid level settlement gauge by using plugs, and then checking whether the sealing conditions of the connectors of the liquid pipe and the air pipe are intact or not, wherein the sealing must be ensured completely;
sixthly, connecting data lines of the liquid level settlement meters, sheathing by using PVC steel wire hoses, and then distributing in the pipe distribution grooves;
seventhly, mounting a protective cover on the liquid level settlement meters, backfilling and compacting the mounting holes and the pipe distribution grooves, and then recording the burying positions, serial numbers, weather and burying personnel of the liquid level settlement meters;
after the installation is finished, carrying out zero calibration on the static level and taking an initial value;
and ninthly, testing according to the testing requirements.
3. Advantageous effects
1. The invention sets a GNSS as a datum point, sets a working base point which can simultaneously monitor each detection point in the area at a corresponding position of the area to be detected according to the distribution condition of the area to be detected, uses the working base point as another GNSS reference point to monitor the deformation of the detection points in the area to be detected, and monitors each working base point in real time through the datum point to realize the step-by-step monitoring of the detection points, thereby widening the coverage range of the monitoring system to the detection points, namely, each working base point at least corresponds to one area to be detected, so that the monitoring system can simultaneously monitor the detection points in a plurality of areas in real time, avoiding the influence on the monitoring effect of the monitoring system due to the fact that the GNSS reference point is only provided with one detection point and can only carry out real-time monitoring on the detection points in a certain range and each detection point is far away from the reference point, this will affect the reception of the GNSS reference point on the transmission signals from the various detection points, thereby affecting the stability of the monitoring system.
2. According to the invention, the arrangement of the corresponding number of the working base points is set according to the distribution condition of the areas to be detected, so that each working base point can respectively and stably monitor the detection points on the corresponding areas to be detected, thereby ensuring the monitoring precision and stability and further ensuring the safety of the areas to be detected; in order to ensure the stability and reliability of the monitoring system, the reference points need to be regularly unified and the factory control points need to be jointly tested so as to realize the unification of the monitoring coordinates and the factory coordinates, and whether the reference points deviate or not can be detected while the joint test is carried out.
3. In the invention, receivers of all working base points and reference points receive GNSS signals in real time and transmit the GNSS signals to a control center in real time through a data communication network, GNSS data processing software of a server of the control center differentially calculates three-dimensional coordinates of all monitoring points in real time, data analysis software acquires the real-time three-dimensional coordinates of all monitoring points and compares the three-dimensional coordinates with initial coordinates to obtain the variation of the monitoring points, meanwhile, the analysis software can alarm according to a preset early warning value, the error level of surface horizontal displacement monitoring is +/-1.5 mm, and the error in the elevation direction is +/-3 mm.
4. The high-precision silicon pressure sensor is arranged in each hydrostatic level, the pressure from the point to the liquid surface of the reference liquid storage tank is sensed by the high-precision silicon pressure sensor, the pressure has a certain linear relation with the liquid level height, if the pressure sensed by the pressure sensor changes, the height difference between the point and the liquid level of the reference point changes, a linear table is calibrated according to the pressure change amount before delivery and the liquid level height difference, a single chip microcomputer in the hydrostatic level can calculate the height difference change value, and the height from the measuring point to the liquid level of the reference point to the sensor is calculated according to H-P/rho-g.
5. The invention adopts the dimethyl silicone oil as the conducting liquid, and has good stability while having the environmental protection effect through the non-toxicity, the heat resistance, the cold resistance and the good chemical stability.
Drawings
FIG. 1 is a schematic diagram of the distribution of detection points according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Examples
In this embodiment, a coal mine is taken as an example to describe the monitoring method of the present invention in detail:
the coal mine earth surface wide area high precision on-line settlement monitoring method comprises the following steps:
s1, determining the positions of detection points on an air shaft, two main shafts and an auxiliary shaft, determining four detection points on each mine, sequentially determining the positions of three working base points and a reference point according to the position of the detection points on each mine, respectively building a monitoring pier on each working base point and the reference point, and respectively installing a GNSS receiver on each monitoring pier, as shown in FIG. 1, wherein S1-S16 in the figure represent the detection points arranged on the mine, G represents the reference point, P1-P3 represents the working base points, A represents the air shaft, B1-B2 represents the main shaft, C represents the auxiliary shaft, and the reference point is built according to the standard of a B-level measurement control point;
s2, respectively installing a static force level gauge on each detection point and each work base point, wherein S17-S19 represent the detection points arranged on the work base points as shown in FIG. 1;
the static level on each working base point is superposed with the mounting position of the GNSS receiver, and the GNSS receiver and the reference point GNSS receiver can form static calculation, provide a high-precision elevation value and check the settlement reference of the static level;
and a high-precision silicon pressure sensor is arranged in each hydrostatic level, a liquid medium is filled between the reference liquid storage tank and the sensor, the pressure sensor in each hydrostatic level senses the pressure from the point to the liquid surface of the reference liquid storage tank, and the pressure has a certain linear relation with the liquid level height. If the pressure sensor senses that the pressure changes, namely the height difference between the point and the reference liquid level changes, a single chip microcomputer in the hydrostatic level can calculate the height difference change value according to a calibration linear meter of the pressure change amount before leaving a factory and the liquid level height difference. Calculating the height from the measuring point to the liquid level of the reference point to the sensor according to the root H/rho g;
s3, mounting a reference liquid storage tank required by the detection point on each mine on a monitoring pier of a nearby work base point, wherein as shown in FIG. 1, the work base point P1 is connected with the detection point S2 on the air shaft through a signal cable, the work base point P2 is respectively connected with the detection points S6 and S10 on the two main shafts through two signal cables, and the work base point P3 is connected with the detection point S14 on the auxiliary shaft through a signal cable;
s4, connecting a static leveling instrument arranged at the positions of a detection point S2, a detection point S6, a detection point S10 and a detection point S14 on each mine to a reference liquid storage tank on a corresponding working base point respectively by using a liquid guide tube and an air guide tube, wherein the four detection points on each mine are connected in parallel by signal cables, all the detection points on each mine share the liquid guide tube and the air guide tube, each liquid guide tube and the air guide tube are sleeved with a PVC tube capable of protecting the liquid guide tube and the air guide tube, and the liquid guide tube and the air guide tube can be protected by the PVC tube, so that the service lives of the liquid guide tube and the air guide tube are prolonged;
s5, connecting each working base point with the reference point through a signal cable;
the mounting of the hydrostatic level described in S2 includes the steps of:
measuring the elevation of each settlement detection point, determining the installation position of the settlement observation point according to elevation data, wherein the observation point connected with the same connecting pipe is approximately horizontal, and a groove is dug between each settlement detection point for embedding a communicating pipe; simultaneously preparing a wrench, a thread seal tape, a liquid medium injection tool, a liquid, an air pipe, an antifreeze liquid with a freezing point of-25 ℃ and made of dimethyl silicone oil, an air pipe joint, purified water, a PVC steel wire hose, a reading instrument and a horizontal ruler, wherein the antifreeze liquid and the purified water are prepared according to a ratio of 3: 1;
secondly, shearing liquid and air pipes with proper lengths according to the distance between detection points, sleeving the liquid and air pipes with steel wire hoses, wrapping ports of the liquid pipe and the air pipes with raw material belts, installing the ports of the liquid pipe on a liquid port of a liquid level settlement gauge by using a joint, and sealing a gas port and a tail end liquid port of the liquid level settlement gauge by using a plug;
inputting the antifreeze into a liquid pipe and an air pipe, opening air ports of settlement gauges at the head end and the tail end when inputting the antifreeze to form a height difference, pouring the prepared antifreeze into a liquid pouring port at the head end of the high-end settlement gauge, exhausting air at the other end, pouring the antifreeze from only one selected end when inputting the antifreeze, otherwise, not exhausting air in a communication pipe, simultaneously putting the liquid level settlement gauge and the liquid pipe into a mounting hole and a groove after pouring a proper amount of antifreeze, fixing the liquid level settlement gauge by using a foundation bolt, determining the level of the liquid level settlement gauge and the liquid pipe by using a level ruler when installing, then opening air ports of other liquid level settlement gauges, pouring a proper amount of silicone oil on the surface of the liquid level to prevent the evaporation of liquid water and air;
reading the readings of the liquid level settlers by using a reading instrument to judge whether the liquid level settlers are in required proper positions or not, wherein when the liquid levels of the liquid level settlers at the reference point and the settlement detection points float to the middle value of the full range, if the reference point is slightly lower than about 30% of the full range of the settlement observation points, the liquid level of the liquid level settlers at the settlement observation points only floats to about 15% of the middle value of the full range, and at the moment, the reference point is higher than about 15% of the middle value, and if the liquid level of the liquid level settlers is insufficient, the anti-freezing liquid can be continuously added until the liquid level reaches the required liquid level;
after liquid adding is finished, installing the port of the air pipe on the air port of the liquid level settlement gauge by using a connector, then sealing the air port of the head end liquid level settlement gauge, the infusion port and the air port of the tail end liquid level settlement gauge by using plugs, and then checking whether the sealing conditions of the connectors of the liquid pipe and the air pipe are intact or not, wherein complete sealing of the connectors must be ensured;
sixthly, connecting data lines of the liquid level settlement meters, sheathing by using PVC steel wire hoses, and then distributing in the pipe distribution grooves;
seventhly, mounting the protective cover on the liquid level settlement meters, backfilling and compacting the mounting holes and the pipe distribution grooves, and then recording the embedding positions, numbers, weather and embedding personnel of the liquid level settlement meters;
carrying out zero calibration on the static level gauge after the assembly is finished and taking an initial value;
and ninthly, testing according to the testing requirements.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.
Claims (6)
1. A coal mine earth surface wide area high-precision online settlement monitoring method is characterized by comprising the following steps:
s1, determining the positions of detection points on a detection area, then sequentially determining the positions of a working base point and a reference point, respectively building a monitoring pier on the working base point and the reference point, wherein the number of the detection areas is at least three, the number of the working base points is at least two, and each monitoring pier is respectively provided with a GNSS receiver;
s2, respectively installing a static force level gauge on each detection point and each working base point; the installation of the hydrostatic level comprises the following steps:
measuring the elevation of each settlement detection point, determining the installation position of the settlement observation point according to elevation data, wherein the observation point connected with the same connecting pipe is approximately horizontal, and a groove is dug between each settlement detection point for burying a communicating pipe; simultaneously preparing a wrench, a thread seal tape, a liquid medium injection tool, a liquid, an air pipe, an antifreeze liquid with a freezing point of-25 ℃ and made of dimethyl silicone oil, an air pipe joint, purified water, a PVC steel wire hose, a reading instrument and a horizontal ruler, wherein the antifreeze liquid and the purified water are prepared according to a ratio of 3: 1;
secondly, shearing a liquid pipe and an air pipe with proper lengths according to the distance between each detection point, sleeving the liquid pipe and the air pipe with steel wire hoses, wrapping the ports of the liquid pipe and the air pipe with raw material belts, installing the port of the liquid pipe on a liquid port of a liquid level settlement gauge by using a joint, and sealing a gas port and a tail end liquid port of the liquid level settlement gauge by using a plug;
inputting the mixed antifreeze into a liquid pipe and an air pipe, opening air ports of settlement gauges at the head end and the tail end when inputting the antifreeze to form a height difference, pouring the prepared antifreeze into a liquid pouring port at the head end of the high-end settlement gauge, exhausting air at the other end, pouring the antifreeze from only one selected end when inputting the antifreeze, otherwise, not exhausting air in the communicating pipe, after pouring a proper amount of antifreeze, putting the liquid level settlement gauge and the liquid pipe into a mounting hole and a groove at the same time, fixing the liquid level settlement gauge by using a foundation bolt, determining the level of the liquid level settlement gauge and the liquid pipe by using a level ruler when mounting, and then opening air ports of other liquid level settlement gauges, pouring a proper amount of silicone oil on the liquid level surface to prevent the evaporation of liquid moisture;
reading the readings of the liquid level settlers by using a reading instrument to judge whether the liquid level settlers are in required proper positions or not, wherein when the liquid levels of the liquid level settlers at the reference point and the settlement detection points float to the middle value of the full range, if the reference point is slightly lower than about 30% of the full range of the settlement observation points, the liquid level of the liquid level settlers at the settlement observation points only floats to about 15% of the middle value of the full range, and at the moment, the reference point is higher than about 15% of the middle value, and if the liquid level of the liquid level settlers is insufficient, the anti-freezing liquid can be continuously added until the liquid level reaches the required liquid level;
after liquid adding is finished, installing the port of the air pipe on the air port of the liquid level settlement gauge by using a connector, then sealing the air port of the head end liquid level settlement gauge, the infusion port and the air port of the tail end liquid level settlement gauge by using plugs, and then checking whether the sealing conditions of the connectors of the liquid pipe and the air pipe are intact or not, wherein the sealing must be ensured completely;
sixthly, connecting data lines of the liquid level settlement meters, sheathing by using PVC steel wire hoses, and then distributing in the pipe distribution grooves;
seventhly, mounting a protective cover on the liquid level settlement meters, backfilling and compacting the mounting holes and the pipe distribution grooves, and then recording the burying positions, serial numbers, weather and burying personnel of the liquid level settlement meters;
after the installation is finished, carrying out zero calibration on the static level and taking an initial value;
ninthly, testing according to the testing requirements;
s3, mounting a reference liquid storage tank required by the detection point on each detection area on a monitoring pier of a nearby working base point, wherein each working base point is connected with at least one detection point on one detection area through a signal cable;
s4, connecting the static level gauge on one detection point in each detection area to the reference liquid storage tank on the corresponding working base point by using a liquid guide pipe and an air guide pipe;
s5, connecting each of the work base points to the reference point by a signal cable.
2. The coal mine earth surface wide-area high-precision online settlement monitoring method as claimed in claim 1, wherein at least two detection points are determined on each detection area, all the detection points on each detection area are connected in parallel through signal cables, and all the detection points on each detection area share one liquid guide pipe and one air guide pipe.
3. The coal mine earth surface wide area high-precision online settlement monitoring method as claimed in claim 1, wherein each of the liquid guide tube and the gas guide tube is sleeved with a PVC tube capable of protecting the liquid guide tube and the gas guide tube.
4. The coal mine earth surface wide-area high-precision online settlement monitoring method as claimed in claim 1, wherein each hydrostatic level is internally provided with a high-precision silicon pressure sensor, and a liquid medium is filled between a reference liquid storage tank and the sensor.
5. The coal mine earth surface wide-area high-precision online settlement monitoring method is characterized in that the static level gauge on each working base point is coincided with the installation position of the GNSS receiver.
6. The coal mine surface wide area high precision online settlement monitoring method of claim 1, wherein the reference point is constructed according to the standard of a B-level measurement control point.
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