CN106525980A - Rock soil mass dynamic parameter damping ratio spot test device and method - Google Patents
Rock soil mass dynamic parameter damping ratio spot test device and method Download PDFInfo
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Abstract
The invention discloses a rock soil mass dynamic parameter damping ratio spot test device and method. The device comprises a sparker electrode, a high voltage control unit, a sensor capable of controlling the directions, a control and data acquisition instrument, and a computer. The test method comprises the steps that firstly hole drilling is conducted in a test site, the holes include a vibration hole and two test holes, the vibration hole and the test holes are on the same section, the vibration hole is provided with a sparker, a speed sensor capable of controlling the directions is set up in the test holes; the amplitude-frequency relation of the seismic wave is obtained by performing a Fourier transform of the time domain data from two groups of sensors through the sensor, the data acquisition instrument and the computer testing and recording the vibration information of the same survey line with different distances from the quake source; the relation of the phase-and-frequency of the test point vibrations is obtained though conducting a correlation analysis of two groups of data from the sensors; and finally the damping ratios of the rock and soil layers corresponding to different frequency vibrations are calculated, according to the vibration of every test point and the relation between the damping ratio and the test points and the relation between the damping ratio and the distances to the quake source.
Description
Technical field
The invention belongs to Geotechnical Engineering field tests, and in particular to a kind of on-the-spot test of Rock And Soil dynamic parameter damping ratio
Device, further relates to the on-the-spot test method of damping ratio.
Background technology
Damping ratio is one of ground dynamic parameter, has critically important status in Aseismic Design.Ground is tested at present
The method of damping ratio mainly has laboratory test and field test.Laboratory test includes (soil) dynamic triaxial tests, the examination of (soil) Resonant Column
Test, (rock) Izod test etc.；Field test is mainly in-situ precast concret block exciter test.For Rock And Soil comes
Say, above test method has that some cannot overcome.First, laboratory test sampling and sample preparation are difficult, soil body sampling and
Disturbance is produced to soil structures unavoidably when sample is processed, it is essentially without getting undisturbed soil when particularly sampling or even last plus
The sample of work inherently reinvents body, carries out laboratory test its result with non-undisturbed sample and can not reflect certainly the true of the live soil body
Real state；Rock Izod test requires that subjects are intact rock, and actual rock mass does not connect comprising a large amount of joint fissures etc.
The mechanical property difference of continuous face, sillar and rock mass is big, it is impossible to substitute mutually.Secondly, live exciter test high cost is typically only capable to
Tested in a certain Rock And Soil aspect for exposing on a small quantity, it is impossible to carry out the exciter test of the following rock-soil layer of earth's surface, tested
As a result whole stratum can not be represented.3rd, result of the test is few comprising quantity of information, and damping ratio is that reflection stress wave is passed in ground body
The parameter of the energy loss during broadcasting, relevant with the frequency of stress wave, current method of testing can not provide damping ratio with frequency
Mutual relation between rate.
In view of the drawbacks of current method of testing, it is necessary to develop a kind of new damping ratio test device and method, the device
And method requires that test principle is clear, it is easy to implement, test result can be anti-for rock mass and the soil body can carry out field test
The real conditions of Rock And Soil, and abundant information is reflected, is easy to designer to use.
The content of the invention
The purpose of the present invention is to there are provided a kind of on-site testing device of Rock And Soil dynamic parameter damping ratio, the device
Simple structure, it is easy to operate, adapt to live various conditions.
Another object of the present invention is to there are provided a kind of on-the-spot test method of Rock And Soil dynamic parameter damping ratio,
The method has taken into account rock mass and the soil body, is drilled by Rock And Soil scene, and the damping ratio of each layer of position of Rock And Soil between testing bore holes is surveyed
Examination process does not have any restrictive requirement to rock-soil layer property, and test process does not have any disturbance to Rock And Soil, maintains
The naturalness of Rock And Soil.In addition, can test to the rock-soil layer in different depth and direction as needed.Test result bag
Damping ratio containing the lower rock-soil layer of different frequency vibration, can provide foundation for Aseismic Design.
In order to realize above-mentioned purpose, the present invention is employed the following technical solutions：
A kind of on-site testing device of Rock And Soil dynamic parameter damping ratio, described device include spark source electrode,
Dual pressure controller, the sensor device in first, second controllable direction, control and data collecting instrument, computer.Spark source
Electrode is placed in exciting hole, and spark source electrode and dual pressure controller are connected by coaxial cable；Control and signal sampler
It is connected with the synchronism output interface of dual pressure controller by coaxial cable, the sensor device that can control direction is accessed by cable
Control and the interface of data collecting instrument, computer are connected with control and data collecting instrument by USB line.Described controllable direction
Sensor device be two, be individually fixed in instrument connection, including lower bottom base, upper bed-plate, lower bottom base include air bag, slow down electricity
Machine, air bag are provided with air-filled pore, and air bag is wrapped in the side wall of lower bottom base, air bag is filled by the inflated hose being connected on pore
Gas, makes lower bottom base be fixed on the designated depth of instrument connection, and reducing motor is fixed on the central authorities of lower bottom base, and its axle is fixed with upper bed-plate
Connection, reducing motor are rotated and drive upper bed-plate to change direction；Upper bed-plate includes push-rod electric machine, sensor, electronic compass, support
Boots, supporting boot are located at the both sides of upper bed-plate, and are fixedly connected with the push rod of push-rod electric machine, promote supporting boot by push-rod electric machine,
Upper bed-plate is fixed on hole wall, sensor is located at the top of push-rod electric machine, electronic compass is fixed on the top of sensor, is sensed
The X of device, Y-direction are consistent with the X of electronic compass, Y-direction.
A kind of on-the-spot test method of Rock And Soil dynamic parameter damping ratio, step is：
1) drilled in test site, drilling hole amount is three, three drilling is respectively swashed in same section
Shake hole, the first instrument connection, the second instrument connection, drills in the rock-soil layer of test；
2) the spark source electrode in above-mentioned on-site testing device is put into into exciting hole designated depth, first, second can
Control direction sensor device is respectively put into the first instrument connection, the designated depth of the second instrument connection, spark source electrode and
On same straight line, described designated depth is the place depth of tested Rock And Soil to two sensor devices；
3) with the azimuth of electronic compass testing bore holes line, adjust the direction of sensor so as to X-direction and drilling line
Direction is consistent；
4) dual pressure controller charges, and control and data collecting instrument are in collection waiting state；
5) dual pressure controller electric discharge, produces pinking, and control and data collecting instrument and computer recording preserve each sensor
Vibration information；
6) data according to the following steps to gathering are processed, and are calculated rock-soil layer different frequency and are vibrated corresponding damping ratio：
A. to two sensor test time-domain signal y1(t) and y2T () carries out Fourier conversion：
B. calculate the time-domain signal y of two sensors1(t) and y2The correlation function Ry of (t)1y2(τ)：
C. calculate the time-domain signal y of two sensors1(t) and y2The crosspower spectrum function Sy of (t)1y2(f)：
D. calculate phase placeFunction：
E. calculate rock-soil layer different frequency and vibrate corresponding damping ratio：
Wherein：
A1(f)、A2F () is respectively the first instrument connection (2), the measuring point particle amplitude of the second instrument connection (3)；
R1, R2 are respectively the distance of the first instrument connection (2) measuring point, the second instrument connection (3) measuring point and the pore electrode that impulses (4)；
t1：Propagation time of the stress wave between two instrument connections；
T：The cycle of ripple.
Preferably, the exciting hole and first, second instrument connection are upright opening.
Further, it is accurately to determine the distance between sensor, before the drilling formal test, carries out bore inclining test.
Preferably, the spark source electrode and sensor are on same elevation.If rock-soil layer is inclined, electricity fire
Flower focus electrode and sensor can not also be on same elevations, but line should be straight line.
Preferably, it is to ensure that the accuracy of signal phase, the control and data collecting instrument are moved in each sensor institute vibration measuring
Each sensor passage synchronously carry out data acquisition.
Preferably, be provided with suspension ring at the top of the controllable direction sensor device, the suspension ring with scale sign
Steel wire rope connection, sensor device moved in the borehole by steel wire rope.
Preferably, what the vibration that spark source electrode is produced was made up of the harmonic wave of multiple different frequencies and amplitude, be
Determine relation between the amplitude of each harmonic wave and phase place and frequency, the vibration time-domain signal to being gathered carries out Fourier transformation and mutually
Correlation analysiss, thus obtain the corresponding damping ratio of vibration of different frequency.
The present invention is that its hammer vibration energy is controllable using the purpose of spark source, and its excited vibrational low-frequency component energy
Height, dominant frequency and seismic wave dominant frequency are close to, therefore the vibration that excites of spark source can preferably simulation seismic wave be in the earth formation
Propagation.The test object of described method of testing is live rock-soil layer, and the sensor in instrument connection can be according to survey
Examination needs accurately adjustment orientation, therefore can test the damping ratio in each depth of rock-soil layer and direction.Described analysis method can
To calculate the corresponding damping ratio of vibration of Rock And Soil layer different frequency.
The present invention compared with prior art, with advantages below and effect：
First, the innovation of method of testing.Damping ratio be reflection vibration in communication process due to material internal friction and its
It hinders the index of the energy dissipation for causing, the present invention to pass through test vibration on same survey line from focus different distance particle
Oscillation Amplitude change calculations damping ratio, is the truly expressed to damping ratio concept, and at present using the method for particle vibration decay,
Rock mass is generalized as into the spring with damping, analysis free damping rule determines damping ratio；Or by dynamic load to adding unloading stagnant
Loop is analyzed, and calculates damping ratio according to energy absorption with release relation, and these methods weaken the behavioral characteristics of damping.
Secondly, test object has extensive representative.Test object of the present invention is comprising under certain limit naturalness
Rock And Soil, and the Rock And Soil of different depth can be tested.Laboratory test test object is spot sampling at present, experiment
Room sample preparation, subjects are inevitably disturbed, or even test object inherently reinvents sample, to live Rock And Soil is
A kind of simple representative, can not reflect the complexity of Rock-soil Mass Structure and local environment；Although live exciter test test object
And original state ground, but its result only represents the behavioral characteristics of small range Rock And Soil near exciting block, and can not reflect ground
The behavioral characteristics of the following rock-soil layer of table.
Furthermore, test result is true and reliable.Damping ratio obtained by the present invention truly reflects Rock And Soil with frequency relation
Vibration characteristics, existing method of testing all assumed that the damping ratio of Rock And Soil is unrelated with frequency of vibration, is not inconsistent with practical situation.
Description of the drawings
Fig. 1 is a kind of schematic diagram of the on-site testing device of Rock And Soil dynamic parameter damping ratio.
Fig. 2 is the structural representation of the sensor device in controllable direction.
Wherein：1- excitings hole, the first instrument connections of 2-, the second instrument connections of 3-, 4- spark source electrodes, 5- high pressure
Controller, 6- first can control the sensor device in direction, and 7- second can control the sensor device in direction, 8- controls and
Data collecting instrument, 9- computers, 10- inflated hoses, 11- steel wire ropes, 12- lower bottom bases, 13- upper bed-plates, 14- air bags,
15- reducing motors, 16- push-rod electric machines, 17- sensors, 18- electronic compass, 19- supporting boots, 20- suspension ring.
Fig. 3 is vibration time-domain curve figure in sensors X direction in embodiment 2.
Fig. 4 is the damping ratio of calculating gained in embodiment 2 and frequency relation scatterplot.
Specific embodiment
The present invention is described in further detail below according to accompanying drawing：
Embodiment 1：
As shown in figure 1, a kind of on-site testing device of Rock And Soil dynamic parameter damping ratio, it includes spark source electrode
4th, the sensor device 7 in the controllable direction of the sensor device 6, second in the controllable direction of dual pressure controller 5, first, control and
Data collecting instrument 8, computer 9, can be divided into four subsystems：
Excitation system：Using spark source as excitation system, including dual pressure controller 5 (XW512C), electric spark shake
Source electrode 4 (common), dual pressure controller 5 and spark source electrode 4 are connected by coaxial cable, and spark source electrode 4 is put
In exciting hole 1；It is that its hammer vibration energy is controllable using the purpose of spark source, and its excited vibrational low-frequency component energy
Height, dominant frequency and seismic wave dominant frequency are close to, therefore the vibration that excites of spark source can preferably simulation seismic wave be in the earth formation
Propagation；
Sensing system：Due to needing test along the Vibration propagation rule in drilling line direction, the direction of sensor is necessary
Keep consistent with drilling line direction, therefore using the sensor device in controllable orientation, the sensor dress in the first controllable direction
The sensor device 7 for putting the 6, second controllable direction is individually fixed in the first instrument connection 2, the second instrument connection 3, by integrated line
Cable is connected with control and data collecting instrument 8；The sensor device in described controllable direction includes lower bottom base 12, upper bed-plate 13,
Upper bed-plate 13 includes push-rod electric machine 16 (A58SW31ZY), sensor 17 (velocity sensor TCS-B3), electronic compass 18
(DCM220B), supporting boot 19, supporting boot 19 are located at the both sides of upper bed-plate, and are fixedly connected with the push rod of push-rod electric machine 16, pass through
Push-rod electric machine 16 promotes supporting boot 19, and upper bed-plate 13 is fixed on hole wall, and sensor 17 is located at the top of push-rod electric machine 16, electricity
Sub- compass 18 is fixed on the top of sensor 17, and the X of sensor 17, Y-direction are consistent with the X of electronic compass 18, Y-direction；Go to the bottom
Seat 12 includes air bag 14, reducing motor 15 (JGY-2838), and air bag 14 is provided with air-filled pore, and air bag 14 is wrapped in the side of lower bottom base 12
Wall, is inflated to air bag 14 by the inflated hose 10 being connected on pore, makes the lower bottom base 12 of sensor device be fixed on drilling
Designated depth, reducing motor 15 is fixed on the central authorities of lower bottom base；The axle of lower bottom base reducing motor 15 is fixed with upper bed-plate 13 and is connected
Connect, reducing motor 15 is rotated and determines the direction of sensor 17 by control and data collecting instrument 8 and electronic compass 18；The biography
Sensor arrangement is moved in the borehole by connecting the steel wire rope 11 of suspension ring 20, and steel wire rope 11 is indicated with scale.
Control and data collecting system：Control and data collecting instrument 8 (DASP) with to sensor orientation control function and
Sensor vibration Signals collecting function, control and data collecting instrument 8 are by coaxial cable and spark source dual pressure controller 5
Synchronism output interface connects, and the sensor device 7 in the controllable direction of sensor device 6, second in the first controllable direction passes through
Cable Access Control and the corresponding interface of data collecting instrument 8, computer 9 are connected with control and data collecting instrument 8 by USB line；
Data acquisition and analysis system：Including computer 9 and acquisition software (COIN DASP V10), the software can be completed
Time domain data is gathered, and with being filtered to institute's gathered data, quick Fourier analyses, autocorrelation analysis, cross-correlation divide
The functions such as analysis, Cross Spectra Analysis.
The invention provides a kind of device of rock-soil layer scene damping ratio testing method, its bag spark source electrode 4, height
Pressure controller 5, the sensor device 7 in the controllable direction of sensor device 6, second in the first controllable direction, control and data
Acquisition Instrument 8, computer 9.Its annexation is：Spark source electrode 4 is placed in exciting hole, spark source electrode 4 and height
Pressure controller 5 is connected by coaxial cable；Control and data collecting instrument 8 are synchronous defeated with dual pressure controller 5 by coaxial cable
Outgoing interface connects, and the sensor device 6,7 that can control direction passes through the interface of cable Access Control and data collecting instrument 8 respectively,
Computer 9 is connected with control and data collecting instrument 8 by USB line.
Embodiment 2：
A kind of on-the-spot test method of Rock And Soil dynamic parameter damping ratio, its step is：
1) drilled in test site, the quantity of drilling is three, three described drillings must be in same section
On, respectively exciting hole 1, the first instrument connection 2, the second instrument connection 3 are drilled in the rock-soil layer for needing test；
2) for accurately determining the spacing of wells, bore inclining is tested with clinograph (SINCO)；
3) spark source electrode 4 is put into by (the depth that tested Rock And Soil is located at the MTD in exciting hole 1 by cable
Degree), the synchronous input interface of the synchronism output interface of dual pressure controller 5 and control and data collecting instrument 8 (DASP) is by coaxial
Cable is connected；
4) sensor device 6 in the first controllable direction is put into by (quilt at the MTD of instrument connection 2 by integrated cable
Survey the depth that Rock And Soil is located), air bag 14 is inflated by inflated hose 10, make the sensor device 6 in the first controllable direction
Lower bottom base 12 be fixed at the MTD of the first instrument connection 2 (depth that tested Rock And Soil is located)；
5) according to step 4) methods described fixes the sensor 7 in the second controllable direction in the second instrument connection 3 and goes to the bottom
Seat；
6) sensor device 7 in the controllable direction of sensor device 6, second in the described first controllable direction is distinguished
It is connected with control and 8 the corresponding interface of data collecting instrument, control and data collecting instrument 8 are connected with computer 9 by USB line；
7) by the azimuth of compass testing bore holes aperture line, by first controllable direction of the adjustment of reducing motor 15
The upper bed-plate 13 of the sensor device 7 in the controllable direction of sensor device 6, second, makes X-direction and the drilling of described sensor
Line direction is consistent, stretches out supporting boot 19 by push-rod electric machine 16, can by the sensor device 6, second in the first controllable direction
The upper bed-plate 13 of the sensor device 7 of control direction is separately fixed on the hole wall of the first instrument connection 2 and the second instrument connection 3；
8) dual pressure controller 5 charges, and control and data collecting instrument 8 are in collection waiting state；
9) dual pressure controller 5 discharges, and produces pinking, and it is controllable that control and data collecting instrument 8 and the record of computer 9 preserve first
The vibration information of the sensor device 7 in the controllable direction of the sensor device 6, second in direction processed；
10) data to gathering are processed, and are calculated rock-soil layer different frequency and are vibrated corresponding damping ratio, viscous damping ratio
D is obtained by following formula：
Wherein：
A1, A2 are respectively the first instrument connection 2, the measuring point particle amplitude of the second instrument connection 3；
R1, R2 are respectively the distance of 2 measuring point of the first instrument connection, 3 measuring point of the second instrument connection and 1 electrode of hole that impulses；
t1：Propagation time of the stress wave between two instrument connections；
T：The cycle of ripple
Above-mentioned formula only for the single vibration of simple harmonic oscillation, i.e. frequency, as spot sensor received signal is
Multi-frequency vibrations synthesis, amplitude A and phase place are all the functions of frequency f.Fourier conversion is carried out to vibration signal, can be with
Obtain A～f relations：
By y1(t) and y2The crosspower spectrum function of (t)：
Phase place can be obtainedFunction:
Wherein：Correlation functionFor：
By carrying out above analysis to two sensor received signals, obtain not finally by damping ratio computing formula
Damping ratio D of rock-soil layer under same frequency.
Spark source electrode 4 and two sensor devices 6,7 must be on same straight lines (if rock-soil layer is to incline
Oblique, spark source electrode and sensor can not be on same elevations, but line equally should be straight line), two sensings
Rock-soil layer between device is test object, it is preferred to use vertical drilling.
For ensureing each biography of the accuracy of the dynamic signal phase of 17 vibration measurings of sensor, the control and data collecting instrument 8
Sensor Channel Synchronous carry out data acquisition.
Applicating example：
Certain engineering ground stratum is mainly made up of silty clay, granite gneiss, amphibolite and diorite-porphyrite, wherein
Based on granite gneiss, amphibolite and diorite-porphyrite are distributed basement rock in dyke rock shape.For testing the resistance of granite gneiss layer
Buddhist nun's ratio, in the vertical drilling of 3 a diameter of 90mm of Ground arrangement, respectively ZK1, ZK2 and ZK3, wherein ZK1 is focus hole, ZK2
Be instrument connection with ZK3,3 drillings are arranged in a linear, pitch-row is 3000mm, drilling depth 19m into 15 meters of granite gneiss layer,
This measuring point depth is 8m and 11m.Before test, each bore inclining situation is tested initially with SINCO inclinometers, with standard
The distance between measuring point is really determined, then testing bore holes line azimuth, finally lay spark source, sensor, and to sensing
Device angle is adjusted so as to which X-direction is consistent with drilling line direction.DASP controls and sampler for data, sample frequency are set
For 1000Hz, sampling duration 2s, when spark source is discharged, DASP while recording the vibration information of two sensors, two
Sensors X direction vibration time-domain curve is as shown in Figure 3.
Fourier conversion is carried out to the X-direction vibration signal of two sensors first, A1 (f) and A2 (f) is obtained, then is calculated
The correlation function and crosspower spectrum function of the X-direction vibration signal of two sensors, obtains phase placeFunction, finally calculates
Go out t1/T, substitute into damping ratio computing formula, the damping ratio under granite gneiss different frequency is just obtained.Fig. 4 is to be calculated
The damping ratio of granite gneiss and frequency relation scatterplot, through regression analyses, are obtained damping ratio and frequency relation fitting are bent
Line, curve show that damping ratio is not a steady state value, but the changing value for increasing with frequency and increasing, test result and reality
It is consistent.
Claims (6)
1. a kind of on-site testing device of Rock And Soil dynamic parameter damping ratio, including spark source electrode (4), dual pressure controller
(5), the sensor device (6) in the first controllable direction, the sensor device (7) in the second controllable direction, control and data are adopted
Collection instrument (8), computer (9), it is characterised in that：Spark source electrode (4) is placed in exciting hole (1), spark source electrode
(4) connected by coaxial cable with dual pressure controller (5)；Control and data collecting instrument (8) pass through coaxial cable and high voltage control
The synchronism output interface connection of device (5), the sensor device (6) in first, second controllable direction, (7) are accessed by cable and are controlled
The interface of system and data collecting instrument (8), computer (9) are connected with control and data collecting instrument (8) by USB line；Described can
The sensor device of control direction is individually fixed in the first instrument connection (2), the second instrument connection (3), can control the sensing in direction
Device device includes lower bottom base (12), upper bed-plate (13), and lower bottom base (12) includes air bag (14), reducing motor (15), air bag (14)
Air-filled pore is provided with, air bag (14) is wrapped in the side wall of lower bottom base (12), and reducing motor (15) is fixed on the central authorities of lower bottom base (12),
The axle of reducing motor (15) is fixedly connected with upper bed-plate (13), and upper bed-plate (13) includes push-rod electric machine (16), sensor (17), electricity
Sub- compass (18), supporting boot (19), supporting boot (19) are located at the both sides of upper bed-plate (13), and solid with the push rod of push-rod electric machine (16)
Fixed to connect, sensor (17) is located at the top of push-rod electric machine (16), and electronic compass (18) is fixed on the top of sensor (17), passes
The X of sensor (17), Y-direction are consistent with the X of electronic compass (18), Y-direction.
2. a kind of on-site testing device of Rock And Soil dynamic parameter damping ratio according to claim 1, it is characterised in that institute
The sensor device (6) in the first controllable direction stated, the sensor device (7) in the second controllable direction, top be provided with and hang
Ring (20), the steel wire rope (11) for being provided with scale sign are connected with suspension ring (20).
3. a kind of on-the-spot test method of Rock And Soil dynamic parameter damping ratio, its step is：
1) drilled in test site, drilling hole amount is three, three described drillings are in same section, respectively exciting
Hole (1), the first instrument connection (2), the second instrument connection (3), drill in the rock-soil layer of test；
2) the spark source electrode (4) in on-site testing device described in claim 1 is put into the specified depth in exciting hole (1)
Degree, first, second controllable direction sensor device (6), (7) are respectively put into the first instrument connection (2), the second instrument connection (3)
, on same straight line, described specifies for designated depth, spark source electrode (4) and two sensor devices (6), (7)
Depth is tested Rock And Soil place depth；
3) with the azimuth of electronic compass testing bore holes line, adjust the direction of sensor (17) so as to X-direction and drilling line
Direction is consistent；
4) dual pressure controller (5) charges, and control and data collecting instrument (8) are in collection waiting state；
5) dual pressure controller (5) electric discharge, produces pinking, and control and data collecting instrument (8) and computer (9) record preserve each biography
The vibration information of sensor；
6) data according to the following steps to gathering are processed, and are calculated rock-soil layer different frequency and are vibrated corresponding damping ratio：
A. to two sensor test time-domain signal y1(t) and y2T () carries out Fourier conversion：
A (f)=∫0 ∞y(t)e-2πftdt
B. calculate the time-domain signal y of two sensors1(t) and y2The correlation function Ry of (t)1y2(τ)：
C. calculate the time-domain signal y of two sensors1(t) and y2The crosspower spectrum function Sy of (t)1y2(f)：
D. calculate phase placeFunction:
E. calculate rock-soil layer different frequency and vibrate corresponding damping ratio：
Wherein：
A1(f)、A2F () is respectively the first instrument connection (2), the measuring point particle amplitude of the second instrument connection (3)；
R1, R2 are respectively the distance of the first instrument connection (2) measuring point, the second instrument connection (3) measuring point and the pore electrode that impulses (4)；
t1：Propagation time of the stress wave between two instrument connections；
T：The cycle of ripple.
4. the on-the-spot test method of Rock And Soil dynamic parameter damping ratio according to claim 3, it is characterised in that：Described
Exciting hole (1) and the first instrument connection (2), the second instrument connection (3) are upright opening.
5. the on-the-spot test method of Rock And Soil dynamic parameter damping ratio according to claim 3, it is characterised in that described
Spark source electrode (4) and two sensor devices (6), (7) present positions are on same level straight line.
6. the on-the-spot test method of Rock And Soil dynamic parameter damping ratio according to claim 3, it is characterised in that described
Control and data collecting instrument are to each measuring point synchronized sampling.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110017131A (en) * | 2019-05-10 | 2019-07-16 | 上海勘察设计研究院(集团)有限公司 | Deep hole orients test device and deep hole method for testing vibration |
| CN111879858A (en) * | 2020-08-31 | 2020-11-03 | 江西理工大学 | Rock damage prediction method based on acoustic emission seismic source dominant frequency uniqueness |
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| CN106525980B (en) | 2019-04-19 |
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