CN106094011B - Dome dam Microseismic monitoring system and method - Google Patents

Dome dam Microseismic monitoring system and method Download PDF

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Publication number
CN106094011B
CN106094011B CN201610509756.8A CN201610509756A CN106094011B CN 106094011 B CN106094011 B CN 106094011B CN 201610509756 A CN201610509756 A CN 201610509756A CN 106094011 B CN106094011 B CN 106094011B
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dam
acceleration transducer
microseism
dome
hole
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CN106094011A (en
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马克
庄端阳
唐春安
吕鹏飞
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Dalian University of Technology
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Dalian University of Technology
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01VGEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V1/00Seismology; Seismic or acoustic prospecting or detecting
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01HMEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H17/00Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups

Abstract

The invention discloses a kind of dome dam Microseismic monitoring system and method, including microseism sensing device, at least one signal acquisition substation and data processing terminal;Microseism sensing device is used to monitor the microseismic signals of dome dam each region in real time during the water storage of dome dam, and the microseismic signals are sent to signal acquisition substation, signal acquisition substation is used to carry out analog-to-digital conversion and storage to the microseismic signals, and transformed signal is sent to data processing terminal, data processing terminal obtains the microseism Evolution Data in each region of dome dam for analyzing transformed signal.On Microseismic Monitoring Technique is applied in the monitoring of water conservancy and hydropower concrete hyperboloid arched dam by the present invention for the first time, danger zone in dome dam water storage phase dam body is inferred to according to the analysis result of micro seismic monitoring, be conducive to accumulate and improve the STABILITY MONITORING during dome dam water storage operation, there is sustainable economic benefit and social benefit.

Description

Dome dam Microseismic monitoring system and method
Technical field
The present invention relates to water conservancy and hydropower technical field more particularly to a kind of dome dam Microseismic monitoring systems and method.
Background technology
With the high speed development of China's water conservancy and hydropower industry, common masonry dam, depressed arch dam can not meet power generation needs, build Making induced joint has become the development trend of nowadays water conservancy and hydropower industry, and extensively using construction in countries in the world.Wherein have The representational Hoover arch dam of height of dam 221.4m built up for nineteen thirty-seven in Colorade USA river valley, height of dam was by that time Over one hundred rice be increased to 200m.Induced joint can not only resist water sand pressure and other loads, produced by higher dam body Head very different the generated energy for increasing power station so that limited water resource is fully utilized.Induced joint water power Once water storage phase dam body of standing goes wrong, the loss that is difficult to save will be brought.
In recent years, with China's Implementation of Western Development strategy and policy, clean energy resource is made full use of, more and more high arches Dam building benefits society.Such as:Monkey rock, Da Gang Mountain on Dadu River etc.;Waxy common wheat, voe on the Lancang River etc.;Yalongjiang River On the large-scale hydroelectric projects project such as Jinping I, silk screen two level.The safety in water storage phase dam vault subsidence region is dam water storage Important link.
The works such as concrete hyperboloid arched dam is since its own gravity is huge, the hydration heat in casting process in addition, and library water washes away All multiple crackings are generated with dam is caused.Existing thermometer, crack gauge and appearance displacement monitoring be all mostly with deflection, The indexs such as deformation velocity, deformation acceleration judge, the dam deformation on concept of time is carried out by the variation tendency of displacement curve Tdeduction prediction research.These methods cannot analyze the breeding, develop, multiplying of rock mass microseismic activity before dam body macroscopic failure itself, Interaction is until the influence that perforation destroys, it more difficult to reproduce the rule of development that the small rupture of dam body induces macroscopic failure.
Research is thought:The unstability of dam body is inevitable related to its internal micro- destructive activity, when traditional monitoring changes, rock Internal portion generates a large amount of micro crackings already.Traditional appearance monitoring result necessarily lags its internal microseismic activity, in this way can not Accomplish forewarning function.Micro rupture is the substantive characteristics that unstable failure occurs for dam rock mass.However, the GPS being widely used at present, temperature The measuring techniques such as meter, multipoint displacement meter, convergence gauge are spent using the apparent information such as displacement deformation as monitoring object, but for dam rock mass Internal micro rupture that may be present is often helpless.
Invention content
In view of this, it is an object of the invention to overcome the deficiencies of the prior art and provide a kind of dome dam micro seismic monitorings On Microseismic Monitoring Technique is applied in the monitoring of water conservancy and hydropower concrete hyperboloid arched dam, studies dome dam by system and method for the first time The micro rupture mechanism of Evolution of dam body during water storage provides prediction and reference for dam water storage trouble free service.
In order to achieve the above object, the present invention adopts the following technical scheme that:
A kind of dome dam Microseismic monitoring system, be connected including microseism sensing device, with the microseism sensing device to A few signal acquisition substation and the data processing terminal being connected with the signal acquisition substation;
The microseism sensing device is each for monitoring the dome dam in real time during the water storage of the dome dam The microseismic signals in a region, and the microseismic signals are sent to the signal acquisition substation, the signal acquisition substation is used for Analog-to-digital conversion and storage are carried out, and transformed signal is sent to the data processing terminal to the microseismic signals, it is described Data processing terminal obtains the microseism Evolution Data in each region of the dome dam for analyzing transformed signal.
Preferably, the microseism sensing device includes multiple acceleration transducers for being arranged as space array, the acceleration Degree sensor is used to detect microseismic signals of the dome dam in each region.
Preferably, the acceleration transducer be single-axis acceleration sensors, every six single-axis acceleration sensors It it is one group, in each group, three single-axis acceleration sensors are arranged on the Ba Zhong areas of the dome dam, the other three institute State the toe area that single-axis acceleration sensors are arranged on the dome dam.
Preferably, the signal acquisition substation include the signal picker that is connected with the microseism sensing device and with it is described The memory that signal picker is connected, the signal picker are used to carry out analog-to-digital conversion, the storage to the microseismic signals Device is used to store transformed signal.
Preferably, the data processing terminal includes data processor and the analysis with the data processor remote interaction Center, the data processor extract the signal hair for meeting microseismic analysis condition for being screened to transformed signal The analysis center is given, the analysis center obtains each area of the dome dam for being analyzed according to the signal of extraction The microseism Evolution Data in domain.
Preferably, it is attached between the microseism sensing device and the signal acquisition substation using cable, the letter It number is attached between acquisition substation and the data processing terminal using twisted-pair feeder or optical fiber.
A kind of micro seismic monitoring method based on above-mentioned dome dam Microseismic monitoring system, includes the following steps:
Microseism sensing device monitors the microseism of described dome dam each region in real time during the water storage of dome dam Signal, and the microseismic signals are sent to signal acquisition substation;
The signal acquisition substation carries out analog-to-digital conversion and storage to the microseismic signals, and transformed signal is sent To data processing terminal;
The data processing terminal analyzes transformed signal, show that the microseism in each region of the dome dam is drilled Change data.
Preferably, the microseism sensing device includes multiple acceleration transducers for being arranged as space array, the microseism Monitoring method further includes the step of setting the acceleration transducer, which includes:
With reference to cavern's situation, geological conditions and the chop state of the dome dam, the acceleration transducer is determined Installation site;
According to the characterisitic parameter of the acceleration transducer and default noise gate, the installation acceleration transducer is determined When the position, angle and the depth that drill;
The acceleration transducer is installed, and wiring company is carried out to the acceleration transducer and the signal acquisition substation It connects.
Preferably, the micro seismic monitoring method carries out before being additionally included in the installation acceleration transducer:
Check the pore-forming situation at drilling hole bottom, including:Into hole site, hole depth, the hole elevation angle and hole smoothness;
Measure the practical three-dimensional coordinate in aperture, and pass through the three-dimensional coordinate that geometrical relationship calculates bottom hole, for subsequently into Positioning of the row to microseism region.
Preferably, in the step of wiring connection is carried out to the acceleration transducer and the signal acquisition substation, institute It states and is attached between acceleration transducer and the signal acquisition substation by cable, the cable is close to the dome dam The suspension of hole wall be laid with, the laying height of the cable is 2-3m, preset distance is provided with hitch point on the cable, institute Preset distance is stated as 3-5m.
On Microseismic Monitoring Technique is applied in the monitoring of water conservancy and hydropower concrete hyperboloid arched dam by the present invention for the first time, constructs and is used for The Microseismic monitoring system of analysis water conservancy and hydropower concrete hyperboloid arched dam in real time, by the micro- of each region of dome dam during water storage Earthquake situations condition is monitored analysis, forms a set of dome dam unstability evolution mechanism analysis method based on micro seismic monitoring, root Targetedly it is inferred to the danger zone in concrete hyperboloid arched dam water storage phase dam body according to the analysis result of micro seismic monitoring, favorably STABILITY MONITORING and analytical technology during gradually accumulating and improving concrete hyperboloid arched dam water storage operation, have sustainable Economic benefit and social benefit, the construction for Chinese large-sized water conservancy and hydropower concrete hyperboloid arched dam provide important reference according to According to.
Description of the drawings
The schematic diagram of dome dam Microseismic monitoring system that Fig. 1 is provided by the embodiment of the present invention;
Fig. 2 a and Fig. 2 b are the layout diagram of acceleration transducer in the embodiment of the present invention;
Fig. 3 is Knock test point under the conditions of difference P wave velocities of wave in the embodiment of the present invention and microseismic event position error relationship Curve graph.
In figure:1st, microseism sensing device;11st, acceleration transducer;2nd, signal acquisition substation;21st, signal picker;22、 Memory;3rd, data processing terminal;31st, data processor;32nd, analysis center.
Specific embodiment
Below by drawings and examples, technical scheme of the present invention is described in further detail.
Present invention firstly provides a kind of dome dam Microseismic monitoring system, as shown in Figure 1, the system is perceived including microseism Device 1, at least one signal acquisition substation 2 being connected with microseism sensing device 1 and the number being connected with signal acquisition substation 2 According to processing terminal 3;
Wherein, microseism sensing device 1 is used to monitor the dome dam in real time during the water storage of the dome dam The microseismic signals of each region, and the microseismic signals are sent to signal acquisition substation 2, signal acquisition substation 2 is used for institute It states microseismic signals and carries out analog-to-digital conversion and storage, and transformed signal is sent to data processing terminal 3, data processing terminal 3, for analyzing transformed signal, obtain the microseism Evolution Data in each region of the dome dam.
The rupture process analysis of rock mass different from the analysis on Stress Field in rock or rock mass, it be related to rock from deformation, Damage development is to the whole process analysis of macroscopical UNSTABLE FAILURE.Microseism (micro rupture) activity is that macroscopical break occurs for dam concrete rock mass Bad omen, and the evolution mould of stress accumulation in water storage phase dam rock mass catastrophe preparation process, stress release and stress migration Formula has consistent regularity with microseism spatial and temporal distributions, i.e.,:Most of microseismic activity with higher-energy release is all distributed in High stress accumulation area.The understanding that the present invention damages concrete hyperbolic dam dam body establish stronger physical mechanics background it On, i.e.,:Dam body destruction is breeding, developing, multiplying until generating macro based on dam concrete inside microseism (micro rupture) activity See crack as a result, can disclose well dam body occur failure mechanism.
Here microseism Evolution Data mainly includes:Main distribution, disturbance region and the energy of dam microseismic activity Concentrated area, and then provide prediction and reference for dam water storage trouble free service.
On Microseismic Monitoring Technique is applied in the monitoring of water conservancy and hydropower concrete hyperboloid arched dam by the present invention for the first time, constructs and is used for The Microseismic monitoring system of analysis water conservancy and hydropower concrete hyperboloid arched dam in real time, by the micro- of each region of dome dam during water storage Earthquake situations condition is monitored analysis, is targetedly inferred to the concrete hyperboloid arched dam water storage phase according to the analysis result of micro seismic monitoring Danger zone in dam body is conducive to gradually accumulate and improve the STABILITY MONITORING during concrete hyperboloid arched dam water storage is runed And analytical technology, there is sustainable economic benefit and social benefit, be Chinese large-sized water conservancy and hydropower concrete hyperboloid arched dam Construction provides important reference frame.
Microseismic monitoring system provided by the present invention can include the interior of the following aspects in specific implementation process Hold:Concrete hyperboloid arched dam micro seismic monitoring structure is set up, the research of country rock elasticity mechanics parameter and its Characteristics of Wave Velocity, concrete Dome dam microseismic signals intelligent acquisition, the design of microseismic detection device, data communication unit and computing unit, data processing and figure It is real so as to reach according to analysis result to the perfect etc. of concrete hyperboloid arched dam Microseismic monitoring system as the design of display portion When monitoring and warning effect.
Preferably, as shown in Figure 1, microseism sensing device includes multiple acceleration transducers 11 for being arranged as space array, Acceleration transducer 11 is used to detect microseismic signals of the dome dam in each region.
Preferably, acceleration transducer 11 is single-axis acceleration sensors, and every six single-axis acceleration sensors are One group, in each group, three single-axis acceleration sensors are arranged on the Ba Zhong areas of the dome dam, described in the other three Single-axis acceleration sensors are arranged on the toe area of the dome dam, are comprehensively supervised with the microseism situation of change to dam It surveys.
Further, signal acquisition substation 2 includes the signal picker 21 being connected with microseism sensing device 1 and is adopted with signal The connected memory 22 of storage 21, signal picker 21 are used to carry out analog-to-digital conversion to the microseismic signals, and memory 22 is used for Transformed signal is stored.
Here signal picker 21 can be 24 A/D converters.
Further, data processing terminal 3 includes data processor 31 and the analysis with 31 remote interaction of data processor Center 32, data processor 31 extract the signal hair for meeting microseismic analysis condition for being screened to transformed signal Analysis center 32 is given, analysis center 32 obtains each region of the dome dam for being analyzed according to the signal of extraction Microseism Evolution Data.
Preferably, it is attached between microseism sensing device 1 and signal acquisition substation 2 using cable, signal acquisition substation 2 It is attached between data processing terminal 3 using twisted-pair feeder or optical fiber.In addition, between data processor 31 and analysis center 32 Can information exchange be carried out by wireless communication mode, to facilitate floor manager and background process.
Correspondingly, the present invention also provides a kind of micro seismic monitoring method based on above-mentioned dome dam Microseismic monitoring system, It is characterized by comprising the following steps:
Microseism sensing device monitors the microseism of described dome dam each region in real time during the water storage of dome dam Signal, and the microseismic signals are sent to signal acquisition substation;
The signal acquisition substation carries out analog-to-digital conversion and storage to the microseismic signals, and transformed signal is sent To data processing terminal;
The data processing terminal analyzes transformed signal, show that the microseism in each region of the dome dam is drilled Change data.
On Microseismic Monitoring Technique is applied in the monitoring of water conservancy and hydropower concrete hyperboloid arched dam by the present invention for the first time, by water storage The microseism situation in each region of period dome dam is monitored analysis, forms a set of dome dam based on micro seismic monitoring and loses Steady evolution mechanism analysis method, has sustainable economic benefit and social benefit, arched for large-scale water conservancy and hydropower Concrete Double The construction on dam provides important reference frame.
Preferably, the microseism sensing device includes multiple acceleration transducers for being arranged as space array, the microseism Monitoring method further includes the step of setting the acceleration transducer, which includes:
With reference to cavern's situation, geological conditions and the chop state of the dome dam, the acceleration transducer is determined Installation site;
According to the characterisitic parameter of the acceleration transducer and default noise gate, the installation acceleration transducer is determined When the position, angle and the depth that drill;
The acceleration transducer is installed, and wiring company is carried out to the acceleration transducer and the signal acquisition substation It connects.
That is, in the present invention, the laying principle of acceleration transducer is as follows:
First, each acceleration transducer palpiform is into good three dimensions array.
According to the characteristics of micro seismic monitoring equipment, in order to reach preferable monitoring effect, accurate three-dimensional events positioning is realized, Acceleration transducer arrangement necessarily is formed good three dimensions array, while to combine practical cavern's situation and geology at scene Condition fully considers influence reasonable Arrangement of the tomography to microseismic signals.
Secondly, bore angle depth is reasonable.
The brill of acceleration transducer is installed in the characteristics of in view of acceleration transducer itself and the requirement for avoiding noise jamming Hole should select rational position, angle and depth, at the same to consider bracing wire, connection it is convenient and efficient.
Finally, wiring is short, fast, accurate.
Wiring connection between sensor and signal acquisition substation, between signal acquisition substation and data processing terminal will It is short, fast, accurate:It is short refer to select shortest adapter path as far as possible, shorten the time of wiring, reduce cable, optical fiber makes Use length;Refer to that installation process is with clearly defined objective soon, be swift in motion, personnel placement it is reasonable, save time and manpower;Standard refers to pacify Dress process is accurate to the corresponding sensor of every cable, the corresponding substation of optical fiber, it is impossible to connection error occurs to system debug Increase unnecessary trouble.
Further, the micro seismic monitoring method carries out before being additionally included in the installation acceleration transducer:
Check the pore-forming situation at drilling hole bottom, including:Into hole site, hole depth, the hole elevation angle and hole smoothness;
Measure the practical three-dimensional coordinate in aperture, and pass through the three-dimensional coordinate that geometrical relationship calculates bottom hole, for subsequently into Positioning of the row to microseism region.
In order to improve monitoring accuracy, the region that micro rupture generates is divided, reaches the accurate mesh for receiving signal and prediction , boring direction is directed toward area to be monitored as possible, and array is more reasonably arranged to realize.Acceleration transducer will be installed on bottom hole Grouting stud bolt on, anchor pole resin must be used to fix acceleration transducer, and couple close.It is installed successively by designing scheme Good acceleration transducer, subsidiary stud bolt (bolt and washer) and dixie cup.The system is installed using not recovery type, and installation accelerates It, should be in hell testing acceleration sensor, it is ensured that acceleration transducer is working properly before spending sensor.Use fast-setting resin Bottom hole is fixed to adhesive for use in water, is installed using mounting rod, acceleration transducer cable is installed across acceleration transducer Acceleration transducer is slided to foot of hole with mounting rod, and fixes 4~5 minutes by the hole of tool;After solidification, it is carefully removed from Mounting rod and tool are connected to acceleration transducer on communication cable finally by special connection box.
In order to which pre- anti-vehicle is by impacting acceleration transducer with site operation, acceleration transducer mounting hole hole Mouth is closed using foam or cement mortar.The diameter of drilling is preferably 42mm, it is contemplated that the actual conditions of drilling device will bore Bore dia may be 50mm;The depth of drilling is 3m or so.It during construction, need to drill by designing scheme position, according to live real Border situation can slightly adjust the bore position of acceleration transducer.
Acceleration transducer is installed on bottom hole, and comprehensive inspection hole bottom pore-forming situation is answered before installing acceleration transducer, including: Into hole site, hole depth, the hole elevation angle, hole smoothness etc., the rock residue in hole must be washed away totally with water after drilling.Drilling Later, the accurate aperture three-dimensional coordinate of actual borehole is measured, and the three-dimensional coordinate for obtaining each bottom hole is calculated by geometry.These Bottom hole coordinate wants input system software to participate in location Calculation, it will microseismic event positioning to the end is directly affected, so, it measures Data needs are accurate as possible with calculating.
Further, in the step of wiring connection is carried out to the acceleration transducer and the signal acquisition substation, It is attached between the acceleration transducer and the signal acquisition substation by cable, the cable is close to the double curvature arch The hole wall suspension on dam is laid with, and the laying height of the cable is 2-3m, and preset distance is provided with hitch point on the cable, The preset distance is 3-5m.
In addition, acceleration transducer installation place reserves the cable of certain length, about 10m depending on site environment.During cable arrangements, The crust of cable should not be damaged, avoids, close to power cable, avoiding the scratch of pedestrian, vehicle as possible, reduces bursting work Deng influence of the activity to cable.The cable of arrangement should hang sign board at a certain distance and at the fork of tunnel, depending on live feelings Depending on condition.
Preferably, a signal acquisition substation can connect 6 single-axis acceleration sensors, realize signal transmission, in order to Consider the integrated management to Microseismic monitoring system, it is micro- that the signal acquisition substation that dam is called in person needed for micro seismic monitoring is connected in series to side slope It shakes in monitoring system.Substation used in dam heel micro seismic monitoring is all placed in the observation cabin of elevation (about 1135m) platform upstream, Ge Gegao The acceleration transducer of journey is all connected to the correspondence point in each comfortable container by communication cable (housing white rubber tube along side slope) It stands, is connected between substation and data processing terminal with optical fiber.
The present invention is explained in detail with a specific embodiment below.
It is domestic that Da Gang Mountain Dam Site is located at Sichuan Province Dadu River middle reaches epimere Ya'an Shimian County township of proaching talent, upstream and downstream It is connected respectively with the hard Liang Bao power stations of planning, leading stone hydropower reservoir station, the 14th of 22 steps for the planning of Dadu River mainstream Step hydropower station.Dam site region mean annual runoff is 318.50 hundred million m3.Reservoir operation scheme 1130.00m, level of dead water 1120m, about 7.42 hundred million m of the following storage capacity of normal pool level3.Rated head 160.0m ensures output 636MW, annual electricity generating capacity 114.30kwh。
Dam uses concrete hyperboloid arched dam form, and crest elevation 1135m, foundation plane elevation 925.0m are maximum Height of dam reaches 210.0m, to improve the uniformity and globality of dam body, enhances its bearing capacity and shockproof properties, arch dam uses high grade Concrete carries out subregion and pours.Dam body is divided into 29 monoliths, and wherein 11#-17# monoliths are vault subsidence monolith, and during which setting 2 leads Bottom outlet, 4 low-leveled outlets are flowed, a plurality of gallery traverses, and internal structure is complicated.Dam body vault subsidence region is in addition to bearing dead weight, the dam foundation Static uplift pressure, silt pressute, the loads such as unrestrained pressure, also subject to the dynamic changed caused by water level constantly changes Uplift pressure.With the continuous rising of water level, vault subsidence upstream region dam body maximum pressure, tensile stress have a larger increase;Catchment The maximum crushing stress in domain increased, and tensile stress then slightly reduces.
Dam area engineering geology is complex, and Dam Foundation Rock mainly grows flower by grain black clouds two in Chengjiang phase canescence, blush Gang Yan is formed, based on blocky-secondary block structure, dam foundation face and the III 2 more broken class granites existed below;Dam Intert the Diabase dyke of development III 2~V class of up/down perforation in batholithic granite body, such as left bank vein β 21, right bank vein β 43, β 8, The β 88 in riverbed etc..These unfavorable geologies are to the Against Sliding Stability and stabilization of dam body stress condition, skewback and oozing for basis Flow control etc. can produce bigger effect.
The Microseismic monitoring system of dam uses structure as shown in Figure 1, and wherein signal acquisition substation 2 is public for Canada ESG Take charge of 3 Paladin signal acquisitions substation, data processing terminal Hyperion data processing terminals of production.According to micro seismic monitoring System features and field engineering condition, by 6 channel single-axis acceleration sensors be laid in positioned at Dam heel area position (3, S1, S2, S3) and dam toe area position (3, S4, S5, S6), the micro rupture signal generated to dam rock mass during water storage It carries out whole day to monitor for 24 hours, as shown in Figure 2 a and 2 b.
Da Gang Mountain dam Microseismic monitoring system carries out state event location using whole Velocity model.In order to test monitoring system Precision and whole velocity of wave, carry out Knock test in 937 elevation of dam, 940 elevation gallerys, determine dam entirety Velocity model And system accuracy, Knock test the results are shown in Table 1.As seen from Figure 3, when dam body entirety P waves velocity of wave is 4200m/s, it is Average localization error of uniting is minimum, and the Knock test worst error according to table 1 at this time is 8m, illustrates dam Microseismic monitoring system Whole position error control can meet the requirement of engineering site within 8m.
1 dam microseism acceleration transducer installation position of table and spatial description
(a total of about 9100m of cable length takes 10000m, a total of about 2750m of cable length to take 3000m)
During Da Gang Mountain power station carries out the second stage of water storage, water storage level rises to 1120m elevations from 1030m, during this period, passes through Filtering process and Noise Identification, obtain microseismic event 41 in arch dams body altogether, and the micro rupture event monitored is mainly distributed on Dam body vault subsidence region 940m~1135m elevations, the feature of stripped distribution, Relatively centralized in 979m~1081m elevations, and Intermediate and close downstream position event is more concentrated, and thinks the vibration by being generated when downstream deep hole and bottom outlet arrangement flood discharge It is caused.The concentrated area of energy is mainly distributed on 940m~1081m elevations, and wherein dam foundation downstream area is that high-energy is concentrated Area, and have the tendency that gradually spreading from the dam foundation to dam crest, show the raising with water level, the increase of dam body uplift pressure generates stress Adjustment induces the germinating positioned at vault subsidence region 940m~1081m elevation concrete micro rupture events and concentration, and causes high energy Amount release.
Micro seismic monitoring data before comparison water storage with the water storage phase find vault subsidence region microseismic event quantity showed increased. Micro rupture event is mainly distributed on vault subsidence close to the dam foundation (937m~979m elevations) position before water storage, and with water level it is gradual on It rises, microseismic event spatial position is also more therewith to appear in vault subsidence region elevation, presents to be distributed to elevation and expand Dissipate distribution, in the aggregation of low elevation trend;The release range of energy is also diffused into the vault subsidence region of large area from the dam foundation, and 940m~1081m elevations are concentrated on, the migration and aggregation in area of energy concentration domain identify the range of vault subsidence danger zone.
The present invention obtains reserve-water-level dynamic change state by building power station water storage phase dam Microseismic monitoring system Under arch dam rock mass microseismicity rule, disclose vault subsidence position as water storage phase dam potential danger region.Pass through microseism Activity time space distribution, the distribution trend that dam body Stress relief releases energy during accurately stating out water storage, before water storage Dam foundation region mainly is released to, with the variation of water level, energy release areas diffuses to entire vault subsidence region by the dam foundation.
Therefore, the present invention provides important reference value for the construction of large-scale water conservancy and hydropower concrete hyperboloid arched dam, With sustainable economic benefit and social benefit.
Above-described specific embodiment has carried out the purpose of the present invention, technical solution and advantageous effect further It is described in detail, it should be understood that the foregoing is merely the specific embodiment of the present invention, is not intended to limit the present invention Protection domain, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should all include Within protection scope of the present invention.

Claims (2)

1. a kind of dome dam Microseismic monitoring system, which is characterized in that including microseism sensing device and the microseism sensing device Connected at least one signal acquisition substation and the data processing terminal being connected with the signal acquisition substation;
The microseism sensing device is used to monitor each area of the dome dam in real time during the water storage of the dome dam The microseismic signals in domain, and the microseismic signals are sent to the signal acquisition substation, the signal acquisition substation is used for institute It states microseismic signals and carries out analog-to-digital conversion and storage, and transformed signal is sent to the data processing terminal, the data Processing terminal obtains the microseism Evolution Data in each region of the dome dam for analyzing transformed signal;
The microseism Evolution Data includes:Main distribution, disturbance region and the area of energy concentration domain of dam microseismic activity;
The microseism sensing device includes multiple acceleration transducers for being arranged as space array, and the acceleration transducer is used for Detect microseismic signals of the dome dam in each region;
The multiple acceleration transducer for being arranged as space array is single-axis acceleration sensors, and every six single shafts accelerate It is one group to spend sensor, and in each group, three single-axis acceleration sensors are arranged on the Ba Zhong areas of the dome dam, separately Outer three single-axis acceleration sensors are arranged on the toe area of the dome dam, and sensor space distance controlling is 50 Rice;
The multiple acceleration transducer for being arranged as space array is installed as follows:
It drills before the acceleration transducer is installed, boring direction is directed toward area to be monitored, to realize more reasonably Arrange acceleration transducer array;
Acceleration transducer is installed on the grouting stud bolt of bottom hole, and acceleration transducer, and coupling are fixed using anchor pole resin It closes closely, specially:
Bottom hole is fixed to fast-setting resin and adhesive for use in water, is installed using mounting rod, acceleration transducer cable is worn The hole of acceleration transducer installation tool is crossed, acceleration transducer is slided into foot of hole with mounting rod, and fix 4~5 minutes; After solidification, mounting rod and tool are removed, acceleration transducer is connected on communication cable finally by special connection box;Add Velocity sensor mounting hole aperture foam or cement mortar closing;The signal acquisition substation, which includes perceiving with the microseism, to be filled Connected signal picker and the memory being connected with the signal picker are put, the signal picker is used for the microseism Signal carries out analog-to-digital conversion, and the memory is used to store transformed signal;The data processing terminal includes number Analysis center according to processor and with the data processor remote interaction, the data processor are used for transformed signal It is screened, extracts and meet the signal of microseismic analysis condition and be sent to the analysis center, the analysis center is used for basis The signal of extraction is analyzed, and obtains the microseism Evolution Data in each region of the dome dam;The microseism sensing device and institute It states and is attached using cable between signal acquisition substation, used between the signal acquisition substation and the data processing terminal Twisted-pair feeder or optical fiber are attached.
A kind of 2. micro seismic monitoring method based on dome dam Microseismic monitoring system described in claim 1, which is characterized in that packet Include following steps:
Microseism sensing device monitors the microseismic signals of described dome dam each region in real time during the water storage of dome dam, And the microseismic signals are sent to signal acquisition substation;
The signal acquisition substation carries out analog-to-digital conversion and storage to the microseismic signals, and transformed signal is sent to number According to processing terminal;
The data processing terminal analyzes transformed signal, obtains the microseism evolution number in each region of the dome dam According to determining water storage phase dam high-energy release areas, obtain the omen that macroscopic failure occurs for dam concrete, can disclose well Failure mechanism occurs for dam body, is inferred to the danger zone in dome dam water storage phase dam body;
The microseism sensing device includes multiple acceleration transducers for being arranged as space array, and the micro seismic monitoring method is also wrapped The step of acceleration transducer is set is included, which includes:
With reference to cavern's situation, geological conditions and the chop state of the dome dam, the peace of the acceleration transducer is determined Holding position, and the acceleration transducer is laid by three dimensions array;
According to the characterisitic parameter of the acceleration transducer and default noise gate, determine to bore when the acceleration transducer is installed Position, angle and the depth in hole;Boring direction is directed toward area to be monitored, and acceleration transducer battle array is more reasonably arranged to realize Row;
Acceleration transducer is installed on the grouting stud bolt of bottom hole, and acceleration transducer, and coupling are fixed using anchor pole resin It closes closely, specially:
Bottom hole is fixed to fast-setting resin and adhesive for use in water, is installed using mounting rod, acceleration transducer cable is worn The hole of acceleration transducer installation tool is crossed, acceleration transducer is slided into foot of hole with mounting rod, and fix 4~5 minutes; After solidification, mounting rod and tool are removed, acceleration transducer is connected on communication cable finally by special connection box;Add Velocity sensor mounting hole aperture foam or cement mortar closing;The micro seismic monitoring method is additionally included in the installation acceleration It is carried out before spending sensor:
Check the pore-forming situation at drilling hole bottom, including:Into hole site, hole depth, the hole elevation angle and hole smoothness;
The practical three-dimensional coordinate in aperture is measured, and passes through the three-dimensional coordinate that geometrical relationship calculates bottom hole, for subsequently carrying out pair The positioning in microseism region;In the step of wiring connection is carried out to the acceleration transducer and the signal acquisition substation, institute It states and is attached between acceleration transducer and the signal acquisition substation by cable, the cable is close to the dome dam The suspension of hole wall be laid with, the laying height of the cable is 2-3m, preset distance is provided with hitch point on the cable, institute Preset distance is stated as 3-5m.
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