CN213023597U - Monitoring system of earth and rockfill dam leakage omnibearing resistivity method - Google Patents
Monitoring system of earth and rockfill dam leakage omnibearing resistivity method Download PDFInfo
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Abstract
The utility model discloses a monitoring system of an earth and rockfill dam seepage all-dimensional resistivity method, which comprises a water pressure sensing system and an all-dimensional resistivity method monitoring system; the pressure sensor module among the water pressure sensing system arranges inside the dam, monitors the inside water pressure change of dam, and the whole electrical data of earth and rockfill dam is gathered to all-round resistivity method monitoring system arranges outside the dam, and both complement each other, restrict each other. And the over-delay automatic switch module combines the water pressure sensing system with the omnibearing resistivity method monitoring system, so that the water pressure sensing system can intelligently control the acquisition of the electrical method monitoring system. The monitoring system has simple structure and convenient arrangement; the defect of observation of seepage around the dam when the seepage of the earth and rockfill dam is observed in the prior art is overcome, and the data reliability is improved.
Description
Technical Field
The utility model relates to a reservoir dam seepage hidden danger monitoring field, in particular to monitoring system of all-round resistivity method of earth and rockfill dam seepage.
Background
The problems that the earth-rock dam is soaked for a long time and the dam body is damaged by leakage are frequently caused by abnormal seepage generated by the dam body due to the severe environment that the water level is high and low. Meanwhile, due to the reasons that the masses of the hills on the two sides of the earth-rock dam are poor, the cleaning of a bank slope section is incomplete, the seepage prevention measure of a dam end connector is not in place and the like, the dam-mountain joint part also faces the risk of seepage around the dam, and the normal operation of the earth-rock dam is threatened. The control of leakage damage becomes an important subject of safety management and operation of earth and rockfill dams, and the problems of complex working conditions, hidden diseases, multiple accidents and the like are faced. Therefore, the establishment of the earth-rock dam leakage monitoring system is the premise that later-stage anti-seepage measures are made, the earth-rock dam leakage monitoring system can run safely for a long time and the engineering benefits are brought into play.
The existing earth and rockfill dam leakage monitoring technology and method mainly comprise detection technologies such as a natural electric field method, a flow field method, a ground penetrating radar method, a surface wave method, a transient electromagnetic method, a high-density resistivity method and the like. When water flow passes through pores or cracks of rocks under the action of certain osmotic pressure, because the surfaces of rock particles have selective adsorption on anions in underground water, redundant anions are left at the upstream of the water flow, and redundant cations exist at the downstream, so that potential difference is generated in the direction of the water flow to form natural potential abnormality. Negative natural potential abnormality is usually formed at a water leakage point, and positive natural potential abnormality is formed at a water outlet point, so that a precondition is provided for developing a natural electric field method to detect a leakage channel. The flow field method is to utilize the similar principle of water flow field and current field, to send a special wave type current field in water, and to indirectly determine the position of piping and leakage inlet by measuring the current density distribution in water. The core technology of the flow field method is that an electric flow field is used for fitting a leaked water flow field, the density vector distribution of the electric flow field is similar to the water flow density vector of the leaked water flow field, the density vector of the electric flow field is concentrated to point to the inlet of the leaked water, and the position of a leakage area is determined according to the density change of the electric flow field. The detection principle of the ground penetrating radar method is to utilize the reflection of high-frequency electromagnetic waves in underground media, which is based on the difference of relative dielectric constant and conductivity of the media. If the leakage path is present at the shallow dam (<10m), higher resolution detection can be achieved using high frequency radar antennas. The surface wave method is essentially to find out the change relation of the wave velocity of the underground medium along with the frequency by utilizing the surface waves of various frequency components according to the frequency dispersion characteristic of surface wave propagation. Transient electromagnetic methods are geophysical methods that infer the water-containing condition in a medium by receiving and analyzing an induced secondary electromagnetic field. The high-density resistivity method derived from the conventional resistivity method is based on the electric parameters of the advantages and disadvantages of the conductivity of the substance, an electric field is established underground through a grounding electrode, and the change of the electric field on the earth surface is observed by an electric measuring instrument, so that the occurrence of the underground geologic body is deduced and explained. In the leakage detection, the water content of the leakage part is higher than that of the normal part of the dam body, so that the apparent resistivity of the leakage part is smaller, the reaction of an electrical method to a low-resistance area is more obvious, and the method is widely applied to the leakage detection of the earth-rock dam. The high-density resistivity method adopts an array idea that all electrodes are laid at one time, the density of data points is obviously improved, the data volume is more, the acquisition speed is higher, the time and the labor are saved, and the electrical distribution characteristics in the geologic body can be reflected more truly by mass data. Meanwhile, a tomography technology is introduced, so that the distribution condition and the change rule of the resistivity section of the underground medium can be more visually displayed. The high-density electrical detection technology is widely applied to various engineering exploration fields due to the advantages compared with other methods.
The above natural electric field method, the flow field method, the ground penetrating radar method, the surface wave method, the transient electromagnetic method and the conventional high-density electrical method have the problems of low intelligent degree, long and laborious manual operation procedures, easy influence of external factors, low accuracy degree and the like. The detection of hidden danger of dam leakage by using a natural electric field method is easily interfered by the scattered current in a detection area, and the detection effect is not ideal; the flow field method can accurately find a leaking water inlet, but cannot determine the position of a leaking water channel, and has certain requirements on the magnitude of leakage; in the ground penetrating radar method, in a dam body with higher water content, the attenuation of high-frequency electromagnetic waves is very serious, so that the effective detection distance is shorter, and the detection effect on deeper leakage points is poorer; the surface wave method is not suitable for medium and large reservoir dams with deep leakage points, and the detection depth is about half wavelength; the transient electromagnetic method cannot detect shallow leakage paths, and the method has low detection resolution and can only be used for rough detection in a large range.
At present, the traditional high-density electrical method is widely applied to earth and rockfill dam detection, and a person skilled in the art combines experimental verification to prove that the high-density electrical method is suitable for comprehensive detection of the whole part and the local part of a dam. However, the conventional high-density electrical method for detecting the leakage of the earth-rock dam has the following problems:
(1) the monitoring method is single, the high-density electrical method has good observation capability on the earth and rockfill dam seepage, but a technical worker obtains a single data source for reference, the data source is mostly from two-dimensional or three-dimensional data inversion of the traditional high-density electrical method, the fault tolerance rate of judgment on the earth and rockfill dam seepage is low, and misjudgment is easy to occur.
(2) Seepage observation problem around the dam: in the prior art, the problem of insufficient observation capability of seepage around a dam is solved, and an electrical method data inversion diagram of a dam body and dam mountain combination part is obtained by extending electrical method measuring lines to mountain bodies on two sides and then detecting and inverting the extended lines. However, the electrodes are arranged on the mountain bodies on both sides, and there are three problems: first, the effective depth and accuracy of the electrical measurement line after extending to the mountain bodies on both sides are reduced, and the distribution density and intensity of the electric field actually passing through the dam-mountain combination parts on both sides are reduced due to the problems that the heterogeneity of the soil quality of the mountain bodies and the height difference of the combination parts of the electrical measurement line and the dam-mountain are increased along with the extension of the measurement line to both sides, and the like, thereby significantly reducing the effective detection depth, data distribution rate and accuracy. Secondly, the coupling effect problem of each electrode and both sides massif soil body medium on the cable conductor, survey after the electricity measuring line extends to both sides massif, because can meet media such as concrete or stone coupling effect relatively poor, influence data result, the field construction is loaded down with trivial details simultaneously, and maneuverability is poor, faces the possibility of doing over again. Thirdly, by using the arrangement mode of the electric measuring lines, the obtained electrical data of the dam-mountain joint part is far less than that of the dam body.
In conclusion, aiming at the requirements of long-term visual observation of the leakage of the earth and rockfill dam and intelligent early warning, the detection depth and precision are improved, the field operation program is simplified, and the monitoring system which can only arrange cables on the body of the earth and rockfill dam, can completely couple the electrodes with the soil body medium of the earth and rockfill dam and can comprehensively observe the leakage of the earth and rockfill dam is particularly important.
SUMMERY OF THE UTILITY MODEL
In view of the above, the present invention has been made in order to provide a monitoring system for earth and rockfill dam seepage all-around resistivity method that overcomes or at least partially solves the above problems.
The embodiment of the utility model provides a monitoring system of all-round resistivity method of earth and rockfill dam seepage, include: a water pressure sensing system and an omnibearing resistivity method monitoring system;
the water pressure sensing system comprises a pressure sensor module, a support rod, a time delay automatic switch module and a signal wire;
a plurality of the supporting rods are arranged in a dam body of a water slope on the back of the earth-rock dam; the supporting rod is provided with a groove; the pressure sensor modules are arranged in the grooves of the supporting rods at intervals of a first preset distance and are sequentially connected in series through the signal wires; the signal wires are all connected with the automatic delay switch module;
the omnibearing resistivity method monitoring system is arranged outside the earth and rockfill dam and is used for acquiring the whole electrical data of the earth and rockfill dam;
the time-delay automatic switch module controls the opening and closing of the omnibearing resistivity method monitoring system according to the received electric signal water pressure value or the received control signal acquired by the pressure sensor module.
In one embodiment, the pressure sensor module is a drop-in level sensor.
In one embodiment, the housing of the drop-in level sensor is made of polytetrafluoroethylene material; the probe of the input type liquid level sensor is made of diffused silicon.
In one embodiment, the omni-directional resistivity method monitoring system includes: the monitoring system comprises a cable, an electrode, a monitoring system power supply and a data acquisition and storage module;
the cable is circumferentially arranged along the top of the earth-rock dam; a plurality of said electrodes arranged around said cable wires;
one end of the electrode is connected with the earth-rock dam, and the other end of the electrode is connected with the cable through a corresponding copper sheet channel; the cable is connected with the data acquisition and storage module through four ports;
and the data acquisition and storage module is connected with a power supply of the monitoring system through the delay automatic switch module.
In one embodiment, two adjacent copper sheet channels are spaced by a second preset distance.
In one embodiment, the electrodes are irrigated with a predetermined concentration of saline.
In one embodiment, the data acquisition and storage module is a network parallel electrical method instrument.
The embodiment of the utility model provides an above-mentioned technical scheme's beneficial effect includes at least:
the embodiment of the utility model provides a pair of all-round resistivity method monitoring system of earth and rockfill dam seepage:
(1) the pressure sensor module among the water pressure sensing system arranges inside the dam, monitors the inside water pressure change of dam, and all-round resistivity method monitoring system arranges outside the dam, gathers the whole electrical data of earth and rockfill dam, and both complement each other, and the restriction each other gives more data panels that can supply the reference for relevant technical staff. Through the time delay automatic switch module, the water pressure sensing system is combined with the omnibearing resistivity method monitoring system, so that the water pressure sensing system can intelligently control the collection of the electrical method monitoring system.
(2) The embodiment of the utility model provides an all-round resistivity method monitoring system of earth and rockfill dam seepage has changed and has arranged the cable conductor in a parallel with the dam axis in the past to extend to the mountain body of both sides and survey the defect that exists, it is simple to have a construction, and suitable type is strong, can survey advantages such as for a long time. Compared with other geophysical observation systems, the system has the advantages of deeper detection depth, large data acquisition amount and high data resolution. The utility model relates to an all-round resistivity method monitoring system has remedied in the past to the observation defect around dam seepage flow when observing earth and rockfill dam seepage, has improved data reliability.
The electrodes do not need to be arranged in the mountains at the two sides, so that the coupling effect of the electrodes and the mountain soil body medium and the coordinates of the electrodes arranged in the mountain terrain do not need to be considered, the workload in the observation process is greatly reduced, and the result is more real and reliable.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
The technical solution of the present invention is further described in detail by the accompanying drawings and examples.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention.
In the drawings:
fig. 1 is a schematic view of an overall structure of an earth-rock dam leakage omnibearing resistivity method monitoring system provided by an embodiment of the present invention;
fig. 2 is a schematic view of an installation and arrangement of a water pressure sensing system in a single water pressure monitoring section according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a circuit connection between a water pressure sensing system and an omnidirectional resistivity method monitoring system provided by an embodiment of the present invention;
fig. 4 is a schematic layout view of a cable for geophysical prospecting according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The embodiment of the present invention provides an omnibearing earth and rockfill dam leakage resistivity method monitoring system, which is described in detail below with reference to the accompanying drawings.
Referring to fig. 1, an all-dimensional resistivity method monitoring system for earth and rockfill dam leakage provided by the embodiment of the present invention includes a water pressure sensing system and an all-dimensional resistivity method monitoring system; the system also can comprise a remote data processing system and an intelligent early warning system;
the water pressure sensing system comprises a pressure sensor module 5, a support rod, a time delay automatic switch module 9, a signal wire 6 and a water pressure sensor power supply 7; the pressure sensor module 5 adopts a plurality of input type liquid level sensors suitable for reservoir dams, converts static pressure into an electric signal based on the principle that the measured liquid static pressure is proportional to the height of the liquid, and converts the electric signal into a standard electric signal through temperature compensation and linear correction.
As shown in fig. 2, a plurality of support rods can be arranged in the dam body drilling holes 8 of the back slope of the earth-rock dam according to the area of the dam body and the distance between the adjacent support rods; the supporting rod is provided with a groove, and a plurality of throw-in type liquid level sensors are arranged in the vertical direction in the supporting rod at intervals of 5 meters or 10 meters. For example, the anti-dropping compound is coated on the threaded part of the drop-in type liquid level sensor and fixed on the preset position of the support rod. The pressure sensor modules are sequentially connected in series through the signal wires and are all positioned in the grooves, so that the signal wires can be prevented from being damaged; the signal wire is led out of the dam body and is sequentially connected with a power supply of the water pressure sensor and the time delay automatic switch module. The power supply of the water pressure sensor is 9V-36V DC.
The omnibearing resistivity method monitoring system is arranged outside the earth and rockfill dam and is used for acquiring the integral electrical data of the earth and rockfill dam; the opening and closing of the omnibearing resistivity method monitoring system can be controlled according to the received electric signal water pressure value or the received control signal acquired by the pressure sensor module.
Specifically, the signal wire transmits the standard electric signal from the pressure sensor module to the time delay automatic switch module; the time-delay automatic switch module can control the operation of the omnibearing resistivity method monitoring system, when the water pressure value of the received standard electric signal is greater than the preset water pressure value, the switch is closed to form a passage, and the omnibearing resistivity method monitoring system starts to operate; the time-delay automatic switch module has a time-delay closing function, when the water pressure value of the received standard electric signal is smaller than a preset water pressure value, the switch is turned off in a time-delay mode to form an open circuit, the omnibearing resistivity method monitoring system is turned off in a time-delay mode, and the integrity of the measured electrical method data is guaranteed. In order to ensure the comprehensiveness of water pressure monitoring, a plurality of throw-in type liquid level sensors can be arranged on the back slope of the earth-rock dam.
For example, the omnibearing resistivity method monitoring system can send the electrical data to a remote data processing system; the remote processing system sends the data to the intelligent early warning system after the data are processed; the intelligent early warning system carries out analysis processing, and when an analysis result reaches an early warning threshold value, an early warning is sent out.
In this embodiment, the pressure sensor module among the water pressure sensing system arranges inside the dam, monitors the inside water pressure change of dam, and all-round resistivity method monitoring system arranges outside the dam, gathers the whole electrical data of earth and rockfill dam, and both complement each other, and the restriction each other gives relevant technical staff more data panels that can supply the reference. The water pressure sensing system is combined with the omnibearing resistivity method monitoring system through a time delay automatic switch arranged on the dam abutment, so that the water pressure sensing system can intelligently control the acquisition of the electrical method monitoring system.
In one embodiment, the housing of the drop-in liquid level sensor can be made of polytetrafluoroethylene materials, so that the water tightness and corrosion resistance of the sensor are ensured, and the reference pressure cavity is communicated with the ambient pressure; the water tightness of the sensor is guaranteed, and the reference pressure cavity is communicated with the ambient pressure, so that the high precision and the high stability of measurement are guaranteed. The probe chip of the drop-in liquid level sensor is made of diffused silicon materials, adopts a full stainless steel seal welding structure, and has good moisture resistance and excellent medium compatibility; the method has the advantages of long mean time between failures, stable performance and high reliability. The water pressure sensing system adopts a two-wire system, namely one signal wire is connected with the anode of a power supply, and the other signal wire is connected with the cathode of the power supply.
In one embodiment, as shown in fig. 1, the omnibearing resistivity method monitoring system is composed of a cable 1, a data acquisition and storage module 2, an electrode 3 and a resistivity method monitoring system power supply 4; the cable 1 is arranged along the circumferential direction of the top of the earth-rock dam; a plurality of measuring electrodes 3 are arranged around the cable line 1; one end of the electrode 3 is connected with the earth-rock dam, and the other end of the electrode is connected with the cable 1 through a corresponding copper sheet channel; the cable 1 is connected with the data acquisition and storage module 2 through four ports; the data acquisition and storage module 2 is connected with the monitoring system power supply 4 through the delay automatic switch module 9. The automatic delay switch module 9 is an automatic delay switch when implemented.
The operation of the omnibearing resistivity method monitoring system is controlled by an automatic delay module of the water pressure sensing system; the geophysical prospecting cable is connected with the data acquisition and storage module through four ports; the electrodes are connected with the cable through the copper sheet channels. As shown in fig. 3, for example, a data acquisition and storage module and a power supply of a monitoring system may be disposed at the center of the cable. The data acquisition and storage module used on site is a network parallel electrical method instrument which is connected with a cable through four ports. The network parallel electrical method instrument has the dual functions of transmitting and receiving signals, is provided with an RS-232 serial port device for receiving commands and transmitting data, and acquires field data of each cable. Electrical methods and instruments need to have the function of synchronous operation. The monitoring system power supply can be formed by integrating a plurality of lithium batteries, can continuously adjust the voltages of 0v, 24v, 48v, 72v and 96v, and is connected with the time delay automatic switch module through a cable.
Preferably, the cable is a geophysical prospecting special cable which is waterproof in sealing, strong in tensile property, wear-resistant and damage-resistant, and each copper sheet channel on the cable is designed to be a pressing die circular ring tap (copper ring). The copper sheet channels can be adjusted at will according to the interval of 0.5-2.5 m. In addition, each electrode needs to be watered with saline water with proper concentration for improving the coupling effect of the electrode and the ground.
As shown in fig. 3, the delay automatic switch module, the acquisition and storage module and the monitoring system power supply are connected in series in the circuit of the omnibearing resistivity method monitoring system; the pressure sensor module and the delay automatic switch module are connected in series in the circuit through a signal line, so that the standard electric signal water pressure value sent by any one input type liquid level sensor is larger than the preset water pressure value, the delay automatic switch module can be closed to one side of the circuit of the omnibearing resistivity method monitoring system, and the omnibearing resistivity method monitoring system starts to operate.
Meanwhile, related technicians can remotely communicate with the network parallel electrical method instrument through a 5G network according to the site situation of the earth-rock dam, manually control the automatic switch module to be switched on or switched off, and freely switch on or switch off the omnibearing resistivity method monitoring system and the water pressure sensing system.
The embodiment of the utility model provides an in, all-round resistivity method monitoring system has compensatied in the past to the observation defect around dam seepage flow when observing earth and rockfill dam seepage, has improved data reliability. The electrodes are not required to be arranged in the mountains at two sides, so that the coupling effect of the electrodes and the soil body medium of the mountains and the coordinates of the electrodes arranged in the landform of the mountains are not required to be considered, the workload in the observation process is greatly reduced, and the result is more real and reliable.
In one embodiment, the remote data processing system comprises a 5G network module and a data processing module; the 5G network module has a function of rapidly transmitting data, and comprises electric method data transmission from the omnibearing resistivity method monitoring system to the remote data processing system and early warning information feedback transmission from the intelligent early warning system to the mobile phone app, so that the leakage hidden danger which possibly occurs in the earth-rock dam can be timely handled by related technicians. Specifically, for example, the data processing module is a notebook or desktop computer with corresponding electrical law data processing software inside; wherein, this electrical method data processing software includes: a network parallel electrical processing system (WBD Pro), Surfer mapping software, Excel, AGI processing software (Earth imager 2D, EarthImager 3D), and the like; the data processing module has the functions of data preprocessing, data inversion processing and data result mapping.
In one embodiment, the intelligent early warning system comprises an intelligent analysis module and an early warning information feedback module; the intelligent analysis module has a dynamic analysis function, for example, deep learning and big data processing technologies are adopted to dynamically compare electrical method data result mapping in different time periods with earth and rockfill dam resistivity data background values stored in the intelligent early warning system, and if the resistivity data mapping in the same position in adjacent monitoring time has overlarge resistivity change amplitude or the resistivity data mapping and resistivity data background value change amplitude are overlarge, the early warning information feedback module sends early warning information to mobile phone apps of related technical personnel through a 5G network.
The method comprises five parts from hardware arrangement to data acquisition and processing and whether to finally send early warning:
(1) the installation and connection operation of the water pressure sensing system specifically comprises the following steps: for example, 5 pressure monitoring sections are arranged on the back slope of the earth-rock dam, the pressure monitoring sections comprise three dam foundation dam body water pressure monitoring sections and two dam abutment dam mountain combination part water pressure monitoring sections, each monitoring section is provided with 3 drill holes, 15 drill holes are arranged, and 30 sets of embedded drop-in type liquid level sensors are embedded. During construction, a drilling machine starts to work after hole position location and lofting of a drill hole are carried out according to design coordinates and elevations. The correctness of the coding and frequency response values of the drop-in level sensor is verified under normal atmospheric pressure and standard temperature conditions. The method comprises the steps of connecting a signal line with a drop-in type liquid level sensor, vertically arranging along a groove of a supporting rod, smearing an anti-falling compound on a threaded part of the drop-in type liquid level sensor, fixing the anti-falling compound on a preset position of the supporting rod, and backfilling a drilled hole by using original sample soil after the supporting rod is placed at the preset position of the drilled hole. The part of the signal wire exposed on the ground is connected with a power supply of the delay automatic switch and the hydraulic pressure sensor which are arranged on the dam abutment, the pressure sensors are connected in parallel in the circuit through the signal wire, and the whole pressure sensing module and the delay automatic switch module are connected in series in the circuit through the signal wire.
(2) The method comprises the following steps of performing operations such as fixed installation and connection on the omnibearing resistivity method monitoring system on a dam body, and specifically comprises the following steps: the electrodes are respectively and fixedly buckled on the copper rings of the cable and are connected with the earth-rock dam, each electrode channel can be adjusted at will according to the distance of 0.5-2.5 m, and saline water with proper concentration needs to be poured into each electrode for improving the coupling effect of the electrodes and the ground. For example, 4 cables (adopting multi-core armored cables) are arranged on the earth-rock dam, and each cable is provided with 16 electrodes and 64 electrodes. The two stations are longitudinally arranged on two sides of the dam (hereinafter referred to as X1 and X2), are respectively tightly attached to dam-mountain combination parts on the two sides, and consist of three parts of an upstream slope, a dam crest and a downstream slope. Two more stations are arranged longitudinally at the top of the dam, parallel to the direction of the dam axis (hereinafter referred to as Y1 and Y2), at a distance from X1 and X2. The coordinates of each electrode were measured and recorded and imported into Excel software. The omnibearing resistivity method monitoring system adopts two longitudinal and two transverse cables for arrangement, increases the electrical data obtained by monitoring the dam-mountain joint part and strengthens the observation of seepage around the dam.
(3) All-round electrical data acquisition of earth and rockfill dam specifically has: setting instrument parameters such as constant current time, sampling time interval, power supply voltage, working mode, power supply mode, acquisition method and the like; when the network parallel electrical method instrument works, each electrode channel on the cable line sequentially generates current into a soil medium through the electrodes to form an electric field, and all the other electrodes perform potential acquisition to finally obtain the electrical data of the earth-rock dam in a monitoring range. The network parallel electrical method instrument is divided into two different working modes of an AM method (single-point power supply field) and an ABM method (dipole power supply field). The data collected by the ABM method reflect the electric field condition of a double-opposite-point power supply, a pair of channel electrodes AB are powered, and 1 electrode is used as a public N pole to provide a reference standard potential. In actual work, the power supply mode is set to be a single positive method, the working mode is an ABM method, the power supply time of the electrode is 0.2 second, and the sampling time interval is 100 milliseconds. A group of electrical data is collected in advance before the comprehensive resistivity method monitoring system is formally operated to serve as a background value, data results are inverted into a picture and uploaded to an intelligent early warning system for subsequent observation and comparison. And after the electrical method data are acquired, the electrical data are transmitted to a remote data processing system through a 5G network.
(4) Data processing and transmission for remote data processing system
The method comprises the steps of receiving electrical data of the earth and rockfill dam transmitted by an omnibearing resistivity method through a 5G network module, and carrying out data processing by software such as a network parallel electrical method processing system (WBD Pro), Surfer mapping software, Excel and AGI processing software (Earth imager 2D, EarthImager 3D), wherein the main steps comprise data preprocessing, data inversion processing, data result mapping and the like.
The data preprocessing flow comprises the following steps: opening raw data using a network parallel electrical processing system (WBD Pro); checking and modifying the electrode coordinates, wherein the operation of converting, sorting and merging coordinate data, adding topographic data, exporting files and the like in Excel software is adopted, and exported file data with topographic data is put into a WBD Pro processing system and simultaneously the original data of each section are merged and unified; and then performing conventional data de-coding, outputting a apparent resistivity data file (dat format) and outputting an AGI inversion format data file (urf format), wherein if abnormal jumping points which do not accord with actual conditions exist in the data, the abnormal jumping points need to be removed, so that the influence of the abnormal jumping points on the real data during later software computing inversion is reduced, and the quality of the data is improved.
Data inversion processing flow: the inversion data are led into AGI inversion software, the AGI inversion software provides three inversion methods, wherein the inversion methods comprise damping least square inversion, smooth model inversion and anti-noise inversion, a proper inversion method can be selected according to field geological conditions and the quality of actual data collection during inversion processing, the smooth coefficient is set to be 30, the damping coefficient is set to be 100, the iteration times are 7, the error is decreased by 5% and the root-mean-square error is 3% to serve as inversion termination parallel conditions, the resistivity value of the dam containing leakage is obtained through inversion, interpolation calculation is conducted on the resistivity value of each inversion recording point below the dam containing the hidden danger, and therefore the three-dimensional image of the resistivity value of the dam containing the leakage area is obtained. And opening a urf format file to be inverted, performing joint inversion after the setting is completed to obtain all-dimensional three-dimensional inversion models on the four stations, and exporting an inversion resistivity data file in a dat format after the inversion is finished.
Data results are plotted: and mapping the apparent resistivity data and the inversion resistivity data derived by the AGI inversion software respectively by using Surfer mapping software. Which comprises the following steps: opening data in a dat format in Surfer software, gridding the data, selecting a gridding method, gridding the data, filtering abnormal data, and selecting a filter to filter the data according to actual needs, whitening the data, and finally obtaining an earth-rock dam leakage geology electrical result diagram through the processing flows.
(5) Intelligent early warning for leakage of earth and rockfill dam
After the data result is mapped, the electrical property result is uploaded to an intelligent early warning system through a 5G network, the resistivity result mapped is read and stored by an intelligent analysis module, and is compared with the resistivity result mapped of a background value and the resistivity result mapped obtained by last monitoring, and if the change range of the resistivity value at the same position is overlarge, a danger early warning is automatically sent to related technical personnel through the 5G network by an early warning information feedback module.
It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (6)
1. The utility model provides a monitoring system of all-round resistivity method of earth and rockfill dam seepage which characterized in that includes: a water pressure sensing system and an omnibearing resistivity method monitoring system;
the water pressure sensing system comprises a pressure sensor module, a support rod, a time delay automatic switch module and a signal wire;
a plurality of the supporting rods are arranged in a dam body of a water slope on the back of the earth-rock dam; the supporting rod is provided with a groove; the pressure sensor modules are arranged in the grooves of the supporting rods at intervals of a first preset distance and are sequentially connected in series through the signal wires; the signal wires are all connected with the automatic delay switch module;
the omnibearing resistivity method monitoring system is arranged outside the earth and rockfill dam and is used for acquiring the whole electrical data of the earth and rockfill dam;
the time-delay automatic switch module controls the opening and closing of the omnibearing resistivity method monitoring system according to the received electric signal water pressure value or the received control signal acquired by the pressure sensor module.
2. The system of claim 1, wherein the pressure sensor module is a drop-in level sensor.
3. The system for omni-directional resistivity method monitoring earth and rockfill dam leakage according to claim 2, wherein the casing of the drop-in type liquid level sensor is made of polytetrafluoroethylene material; the probe of the input type liquid level sensor is made of diffused silicon.
4. The system of claim 1, wherein the omni-directional resistivity method monitoring system comprises: the monitoring system comprises a cable, an electrode, a monitoring system power supply and a data acquisition and storage module;
the cable is circumferentially arranged along the top of the earth-rock dam; a plurality of said electrodes arranged around said cable wires;
one end of the electrode is connected with the earth-rock dam, and the other end of the electrode is connected with the cable through a corresponding copper sheet channel; the cable is connected with the data acquisition and storage module through four ports;
and the data acquisition and storage module is connected with a power supply of the monitoring system through the delay automatic switch module.
5. The system for omni-directional resistivity method monitoring earth and rockfill dam leakage according to claim 4, wherein a second predetermined distance is provided between two adjacent copper channels.
6. The system for monitoring the omnibearing resistivity method of the earth and rockfill dam leakage according to any one of the claims 4 to 5, wherein the data acquisition and storage module is a network parallel electrical method instrument.
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| CN113588723B (en) * | 2021-09-03 | 2024-03-15 | 安徽工大信息技术有限公司 | Calculation method of underground space humidity and application of calculation method in electronic anti-seepage system of Internet of things |
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