CN105929450A - Off-shore soft soil wave velocity testing method - Google Patents
Off-shore soft soil wave velocity testing method Download PDFInfo
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- CN105929450A CN105929450A CN201610494060.2A CN201610494060A CN105929450A CN 105929450 A CN105929450 A CN 105929450A CN 201610494060 A CN201610494060 A CN 201610494060A CN 105929450 A CN105929450 A CN 105929450A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/38—Seismology; Seismic or acoustic prospecting or detecting specially adapted for water-covered areas
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/38—Seismology; Seismic or acoustic prospecting or detecting specially adapted for water-covered areas
- G01V1/3817—Positioning of seismic devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/38—Seismology; Seismic or acoustic prospecting or detecting specially adapted for water-covered areas
- G01V1/3843—Deployment of seismic devices, e.g. of streamers
- G01V1/3852—Deployment of seismic devices, e.g. of streamers to the seabed
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Abstract
An off-shore soft soil wave velocity testing method includes a multi-inspecting holes combined testing step, an on-site longitudinal waves and transverse waves testing step, a data processing step in which identification and pick time of the longitudinal waves and transverse waves are processed through software, a rock-soil body wave velocity refined calculation step including transmitting-receiving distance correction, sleeve wave velocity correction, in-hole seawater influence correction, longitudinal wave and transverse wave speed refined calculation and multi-hole combined test speed correction. The multi-hole combined test method solves the problem that single hole wave velocity test in marine soil weak and soft stratums is impossible, and influence of the interference factors of seawater, sleeves, hole inclination on the wave velocity test calculation result can be eliminated. The precision of stratum wave velocity value is substantially improved.
Description
[technical field]
The present invention relates to a kind of marine soil body method of testing, particularly relate to test soil body shear wave velocity and the method for rock mass velocity of longitudinal wave of weak soil.
[background technology]
Accurately obtain soil body shear wave velocity and the rock mass velocity of longitudinal wave of each rock-soil layer; there is provided accurate geophysical parameters support to accurately judging that site category, great soil group are other, determine tunnel surrounding rank, Rock And Soil dynamical possion ratio, indulge transverse wave speed offer for Hai Ji stratum, Shenzhen area simultaneously and add up empirical value accurately.Solve the problem that conventional stratum wave velocity testing method cannot obtain the long-pending true velocity of wave of soft stratum in sea.
The most conventional stratum wave velocity test technique comparative maturity, include PS (P wave, shear wave) ripple measuring technology and ultrasonic wave measurement technique etc., wherein the test of PS ripple is main uses single hole to pick up a layer longitudinal wave velocity Vp and shear-wave velocity Vs for the method each soil layer of test, the method is to tap the plate that impulses in ground level direction, produce the shearing wave propagated to soil layer surrounding, through compressional wave and shearing wave is accepted by the three component sensor in hole, according to the first arrival time of ripple, calculate longitudinal wave velocity Vp and shear-wave velocity Vs.
The method needs first to carry out drilling, puts into sensor and detect in hole, it is desirable to boring must be unimpeded, it is impossible to the situation of occur collapsing hole and shrinkage cavity, otherwise sensor can not be put into, it is impossible to tests.Due to test be typically in location, marine site mud and quicksand formation and loose banket, the broken ground such as rockfill, collapse hole and shrinkage cavity phenomenon easily occur during pore-forming, in this case in order to ensure that the sleeve pipe of putting into smoothly and must use of sensor carries out retaining wall, being smoothed out of guarantee test job to this formation.But, consequently, it is possible to due to the impact of sleeve pipe, then cannot accurately record the true velocity of wave of this part soil body, there is bigger error, thus affect the accuracy of relevant evaluation work in measured value and actual value.Not yet there is better method to solve above-mentioned technical problem at present.
[summary of the invention]
The present invention is directed to case above propose and a kind of solve the problem that the long-pending weak scall in sea cannot be carried out single hole wave velocity testing; avoid the interference factor impacts on wave velocity testing result of calculation such as sea water, sleeve pipe, hole deviation simultaneously, accurately obtain the wave velocity testing method of stratum value of wave speed.
Marine weak soil wave velocity testing method involved in the present invention, it is characterised in that the method comprises the following steps:
Step one: porous translocation drilling hole, three translocation borings are arranged in soft soil area, translocation boring is triangularly arranged, after boring and place sleeve pipe, in sleeve pipe, set reception cymoscope gather vibration data, a boring is used to excite in each level course position, the mode that two other boring gathers, and exchange the position, hole exciting and gathering successively；
Step 2: on-the-spot test, velocity of longitudinal wave test focus uses spark source, excites high-frequency seism compressional wave, and shear wave velocity test focus uses down-hole shear wave hammer, adherent excites high-energy secondary wave；Receiving cymoscope uses high accuracy three-component probe in water to receive compressional wave and shear wave；
Step 3: data process, P wave (P ripple) and the identification of secondary wave (S ripple) and arrival time pickup use HoleWin2.0 software, and the calculating of velocity of wave and various modulus uses CROSSHOLE TEST INTERPRETATION (V1.0) software；
Step 4: Rock And Soil velocity of wave becomes more meticulous calculating, carries out reception and transmission range correction；Sleeve pipe velocity of wave corrects；Hole maritime interior waters impact correction；
The velocity of longitudinal wave computing formula that becomes more meticulous is:
In formula:
VpFor surveying the velocity of longitudinal wave of each rock-soil layer；
Δ L is to launch boring and the distance received between drill center；
Rz1、Rz2It is respectively the radius launched boring with receive boring；
T is compressional wave first arrival time；
D1、D2It is respectively the thickness launched boring with receive drilling hole inner sleeve；
Vpt1、Vpt2It is respectively the velocity of longitudinal wave launched boring with receive drilling hole inner sleeve；
VSea waterVelocity of longitudinal wave for boring location, marine site, place sea water；
RtThe radius popped one's head in for compressional wave explosive source (electric spark)；
RsThe radius of cymoscope (three-component geophone in water) is received for compressional wave；
The shear wave velocity computing formula that becomes more meticulous is:
In formula:
VsFor surveying the shear wave velocity of each rock-soil layer；
Δ L is to launch boring and the distance received between drill center；
Rz1、Rz2It is respectively the radius launched boring with receive boring；
T is shear wave first arrival time；
D1、D2It is respectively the thickness launched boring with receive drilling hole inner sleeve；
Vst1、Vst2It is respectively the shear wave velocity launched boring with receive drilling hole inner sleeve；
VSea waterVelocity of longitudinal wave for boring location, marine site, place sea water；
RtThe radius popped one's head in for compressional wave explosive source (electric spark)；
RsThe radius of cymoscope (three-component geophone in water) is received for compressional wave；
The total shear wave velocity of porous translocation corrects: use three hole translocation modes, each boring will carry out data acquisition respectively as transmitting boring and reception boring, therefore every pair of compressional wave holed between any MTD and shear wave all can calculate two values of wave speed, i.e. V (ZK1 → ZK2) and V (ZK2 → ZK1), the Rock And Soil value of wave speed finally determined should be the meansigma methods of the two:
These three borings are triangularly arranged, and middle bore position is near the connecting line of other two borings, and the vertical line distance between connecting line is 5～10m；Spacing between each two boring is less than 20m.
In its step one, need that the sleeve pipe placed is carried out wall thickness in advance and accurately measure.
Described wall thickness is accurately measured and is referred to tilt to be placed in water by sleeve pipe, uses single-hole method accurately to record sleeve pipe p-and s-wave velocity, carries out the sleeve pipe velocity of wave correction of step 3.
Step one drilling construction carries out hole deviation degree test after terminating, and records actual measured results, according to actual measurement hole deviation, carries out the reception and transmission range correction of step 3.
The hole maritime interior waters impact correction of step 3: during longitudinal wave velocity test, electric spark excitation signal passes through sleeve pipe through sea water and propagates to along Rock And Soil arrive after reception borehole casing passes sea water receive cymoscope；During transverse wave speed test, down-hole shearing hammer is close to sleeve pipe and is excited, and the shear wave signal excited passes through sleeve pipe and propagates to be converted into after compressional wave signal passes hole maritime interior waters after reception borehole casing passes sleeve pipe arrive reception cymoscope along Rock And Soil.
Explosive source should keep placing vertically downward along drill center position with receiving cymoscope；Explosive source should keep same absolute altitude to place with receiving cymoscope.
During the arrival time pickup identified in step 3 Data processing, test record, P ripple and the identification of S ripple and contrast are according to following principle:
The waveform of each recorded trace, amplitude and the similar features of vibration continuity degree；P ripple arrives feature prior to S ripple；P wave-amplitude is less than S wave-amplitude；The S wave characteristic cycle is at least the twice in P wave characteristic cycle；Forward and reverse when impulsing, S wave phase is contrary, P wave phase is identical；The pickup of compressional wave arrival time typically contrasts X-component and Y-component, and the pickup of shear wave first arrival time typically contrasts Z component, and contrast uses single-phase contrast or leggy contrast.
The compressional wave arrival time of pickup is first arrival time；And the shear wave arrival time picked up is generally first arrival time, when first arrival time is affected by the compressional wave wave train, shear wave arrival time uses the time of peak swing.
The present invention uses porous translocation to send out to carry out marine weak soil wave velocity testing; porous translocation method solves the problem that the long-pending weak scall in sea cannot be carried out single hole wave velocity testing; avoiding the interference factor impacts on wave velocity testing result of calculation such as sea water, sleeve pipe, hole deviation, the stratum value of wave speed precision of acquisition is greatly improved simultaneously.
[accompanying drawing explanation]
Figure 1It it is the translocation boring layout of the marine weak soil wave-wave speed method of testing related to of the present inventionFigure；
Figure 2It it is the on-the-spot test signal of the marine weak soil wave-wave speed method of testing related to of the present inventionFigure；
Figure 3It it is the longitudinal wave velocity propagation signal of the marine weak soil wave-wave speed method of testing related to of the present inventionFigure；
Figure 4It it is the transverse wave speed propagation signal of the marine weak soil wave-wave speed method of testing related to of the present inventionFigure；
[detailed description of the invention]
Below in conjunction with the present inventionAccompanying drawingWith detailed description of the invention, the present invention is described in further detail.
Marine weak soil wave velocity testing method involved in the present invention, it is characterised in that the method comprises the following steps:
Step one: porous translocation drilling hole, refer toAccompanying drawing 1Three translocation borings are arranged in soft soil area, it is respectively ZK1, ZK2 and ZK3, translocation boring is triangularly arranged, after boring and place sleeve pipe, in sleeve pipe, set reception cymoscope gather vibration data, use a boring to excite in each level course position, the mode that two other boring gathers, and exchange the position, hole exciting and gathering successively；ZK1 hole excites, and ZK2, ZK3 hole receives；ZK2 hole excites, and ZK1, ZK3 hole receives；ZK3 hole excites, and ZK1, ZK2 hole receives；Ensure that all there are two measured datas each level course position, gather data and the reliability of result of calculation to improve.
The sleeve pipe placed all should carry out wall thickness in advance and accurately measure, described wall thickness is accurately measured and is referred to tilt to be placed in water by sleeve pipe, use single-hole method accurately to record sleeve pipe p-and s-wave velocity, need when velocity of wave calculates the result accurately measured by wall thickness to carry out sleeve pipe velocity of wave correction.
Drilling construction should carry out hole deviation degree test after terminating, and records actual measured results, according to actual measurement hole deviation, carries out reception and transmission range correction.
Step 2: on-the-spot test, refer toAccompanying drawing 2, there is shown on-the-spot test signalFigure, velocity of longitudinal wave test focus uses spark source, excites high-frequency seism compressional wave, and shear wave velocity test focus uses down-hole shear wave hammer, adherent excites high-energy secondary wave；Receiving cymoscope uses high accuracy three-component probe in water to receive compressional wave and shear wave；
It should be noted that explosive source and reception cymoscope should keep placing vertically downward along drill center position during data acquisition；Explosive source should keep same absolute altitude to place with receiving cymoscope.
Step 3: data process, P wave (P ripple) and the identification of secondary wave (S ripple) and arrival time pickup use HoleWin2.0 software, and the calculating of velocity of wave and various modulus uses CROSSHOLE TEST INTERPRETATION (V1.0) software；
During the arrival time pickup identified in step 3 Data processing, test record, P ripple and the identification of S ripple and contrast are according to following principle:
The waveform of each recorded trace, amplitude and the similar features of vibration continuity degree；P ripple arrives feature prior to S ripple；P wave-amplitude is less than S wave-amplitude；The S wave characteristic cycle is at least the twice in P wave characteristic cycle；Forward and reverse when impulsing, S wave phase is contrary, P wave phase is identical；The pickup of compressional wave arrival time typically contrasts X-component and Y-component, and the pickup of shear wave first arrival time typically contrasts Z component, and contrast uses single-phase contrast or leggy contrast.
The compressional wave arrival time of pickup is first arrival time；And the shear wave arrival time picked up is generally first arrival time, when first arrival time is affected by the compressional wave wave train, shear wave arrival time uses the time of peak swing.
Step 4: Rock And Soil velocity of wave becomes more meticulous calculating,
1, carrying out reception and transmission range correction, the correction of described reception and transmission range is i.e. relevant to hole deviation degree, and hole deviation degree directly affects the actual reception and transmission range in hole, so after accurate measured hole gradient, accurately correcting actual reception and transmission range, getting rid of the interference to value of calculation of the actual reception and transmission range.
2, the correction of sleeve pipe velocity of wave, the most accurately measures the thickness of sleeve pipe, tilts to be placed in water by sleeve pipe, uses single-hole method accurately to record sleeve pipe p-and s-wave velocity, should sleeve pipe impact be counted when velocity of wave calculates.
3, hole maritime interior waters impact correction, during longitudinal wave velocity test, electric spark excitation signal passes through sleeve pipe through sea water and propagates to along Rock And Soil arrive after reception borehole casing passes sea water receive cymoscope；During transverse wave speed test, down-hole shearing hammer is close to sleeve pipe and is excited, and the shear wave signal excited passes through sleeve pipe and propagates to be converted into after compressional wave signal passes hole maritime interior waters after reception borehole casing passes sleeve pipe arrive reception cymoscope along Rock And Soil.Therefore velocity of wave should take into full account the influence factor of sea water when calculating.The sea water velocity of longitudinal wave near boring should be recorded in advance during on-the-spot test.
4, velocity of longitudinal wave becomes more meticulous calculating, refer toAccompanying drawing 3, it is shown that longitudinal wave propagation mode, during longitudinal wave velocity test, electric spark excitation signal passes through sleeve pipe through sea water and propagates to receive the sleeve pipe of boring along Rock And Soil, arrives and receive cymoscope after sea water, and propagation path is such asUpper figure instituteShow, then revising later Rock And Soil velocity of longitudinal wave is:
In formula:
VpFor surveying the velocity of longitudinal wave of each rock-soil layer；
Δ L is to launch boring and the distance received between drill center；
Rz1、Rz2It is respectively the radius launched boring with receive boring；
T is compressional wave first arrival time；
D1、D2It is respectively the thickness launched boring with receive drilling hole inner sleeve；
Vpt1、Vpt2It is respectively the velocity of longitudinal wave launched boring with receive drilling hole inner sleeve；
VSea waterVelocity of longitudinal wave for boring location, marine site, place sea water；
RtThe radius popped one's head in for compressional wave explosive source (electric spark)；
RsThe radius of cymoscope (three-component geophone in water) is received for compressional wave；
5, shear wave velocity becomes more meticulous calculating, during transverse wave speed test, down-hole shearing hammer is close to sleeve pipe and is excited, and the shear wave signal excited passes through sleeve pipe and propagates to be converted into after compressional wave signal passes hole maritime interior waters after reception borehole casing passes sleeve pipe arrive reception cymoscope along Rock And Soil.Propagation path is such asUpper figure instituteShow, then revising later Rock And Soil shear wave velocity is:
In formula:
VsFor surveying the shear wave velocity of each rock-soil layer；
Δ L is to launch boring and the distance received between drill center；
Rz1、Rz2It is respectively the radius launched boring with receive boring；
T is shear wave first arrival time；
D1、D2It is respectively the thickness launched boring with receive drilling hole inner sleeve；
Vst1、Vst2It is respectively the shear wave velocity launched boring with receive drilling hole inner sleeve；
VSea waterVelocity of longitudinal wave for boring location, marine site, place sea water；
RtThe radius popped one's head in for compressional wave explosive source (electric spark)；
RsThe radius of cymoscope (three-component geophone in water) is received for compressional wave；
6, porous translocation total shear wave velocity correction: use three hole translocation modes, each boring will carry out data acquisition respectively as transmitting boring and reception boring, therefore every pair of compressional wave holed between any MTD and shear wave all can calculate two values of wave speed, i.e. V (ZK1 → ZK2) and V (ZK2 → ZK1), the Rock And Soil value of wave speed finally determined should be the meansigma methods of the two:
Owing to also can accurately obtain the value of wave speed of each rock-soil layer in the presence of sleeve pipe, porous translocation method can be under any circumstance suitable for, simultaneously by repeatedly testing averaged, measuring accuracy is higher, so for relatively conventional wave velocity test technique, it is higher that the present invention has measuring accuracy, the wider array of advantage of the suitability.It is thus possible to judge that site category, great soil group are other, determine tunnel surrounding rank, Rock And Soil dynamical possion ratio more accurately and efficiently to provide accurate geophysical parameters support, indulge transverse wave speed for Hai Ji stratum, Shenzhen area and accurate statistics experience is provided.
Mother gulf Sea-Crossing Passage engineering is the first bar seabed tunnel project of Shenzhen, design is intended using immersed tube tunnel to pass through marine site section, penetrating ground is mainly deep marine mud, sand, the soft layers such as barged-in fill, during drilling, the boring of this part must use sleeve pipe to carry out retaining wall, prevent collapse hole, shrinkage cavity etc., when now using the wave velocity test technique of routine, the true velocity of wave of this part boring can not be obtained, thus the accuracy that impact is to this formation properties evaluations, and this formation is the master stratum of this project, and then engineering design can be misled, cause the generation etc. of engineering accident.And the present invention is directed to this shortcoming, suit the remedy to the case, fundamentally solve the problem that the existence of sleeve pipe can not obtain the accurate value of wave speed of rock-soil layer, for this project soft layer character evaluated comprehensively and accurately and provide foundation accurate, effective, thus the design for project provides parameter accurate, reliable and evaluates suggestion.
The above, it it is only present pre-ferred embodiments, not the present invention is made any pro forma restriction, although the present invention is disclosed above with preferred embodiment, but it is not limited to the present invention, any those skilled in the art, in the range of without departing from technical solution of the present invention, when the technology contents of available the disclosure above makes a little change or is modified to the Equivalent embodiments of equivalent variations, in every case it is without departing from technical solution of the present invention content, any simple modification that above example is made is referred to according to the technology of the present invention, equivalent variations and modification, belong in the range of technical solution of the present invention.
Claims (9)
1. a marine weak soil wave velocity testing method, it is characterised in that the method comprises the following steps:
Step one: porous translocation drilling hole, three translocation borings are arranged in soft soil area, translocation boring is triangularly arranged, after boring and place sleeve pipe, in sleeve pipe, set reception cymoscope gather vibration data, a boring is used to excite in each level course position, the mode that two other boring gathers, and exchange the position, hole exciting and gathering successively；
Step 2: on-the-spot test, velocity of longitudinal wave test focus uses spark source, excites high-frequency seism compressional wave, and shear wave velocity test focus uses down-hole shear wave hammer, adherent excites high-energy secondary wave；Receiving cymoscope uses high accuracy three-component probe in water to receive compressional wave and shear wave；
Step 3: data process, P wave (P ripple) and the identification of secondary wave (S ripple) and arrival time pickup use HoleWin2.0 software, and the calculating of velocity of wave and various modulus uses CROSSHOLE TEST INTERPRETATION (V1.0) software；
Step 4: Rock And Soil velocity of wave becomes more meticulous calculating, carries out reception and transmission range correction；Sleeve pipe velocity of wave corrects；Hole maritime interior waters impact correction；
The velocity of longitudinal wave computing formula that becomes more meticulous is:
In formula:
VpFor surveying the velocity of longitudinal wave of each rock-soil layer；
Δ L is to launch boring and the distance received between drill center；
Rz1、Rz2It is respectively the radius launched boring with receive boring；
T is compressional wave first arrival time；
D1、D2It is respectively the thickness launched boring with receive drilling hole inner sleeve；
Vpt1、Vpt2It is respectively the velocity of longitudinal wave launched boring with receive drilling hole inner sleeve；
VSea waterVelocity of longitudinal wave for boring location, marine site, place sea water；
RtThe radius popped one's head in for compressional wave explosive source (electric spark)；
RsThe radius of cymoscope (three-component geophone in water) is received for compressional wave；
The shear wave velocity computing formula that becomes more meticulous is:
In formula:
VsFor surveying the shear wave velocity of each rock-soil layer；
Δ L is to launch boring and the distance received between drill center；
Rz1、Rz2It is respectively the radius launched boring with receive boring；
T is shear wave first arrival time；
D1、D2It is respectively the thickness launched boring with receive drilling hole inner sleeve；
Vst1、Vst2It is respectively the shear wave velocity launched boring with receive drilling hole inner sleeve；
VSea waterVelocity of longitudinal wave for boring location, marine site, place sea water；
RtThe radius popped one's head in for compressional wave explosive source (electric spark)；
RsThe radius of cymoscope (three-component geophone in water) is received for compressional wave；
The total shear wave velocity of porous translocation corrects: use three hole translocation modes, each boring will carry out data acquisition respectively as transmitting boring and reception boring, therefore every pair of compressional wave holed between any MTD and shear wave all can calculate two values of wave speed, i.e. V (ZK1 → ZK2) and V (ZK2 → ZK1), the Rock And Soil value of wave speed finally determined should be the meansigma methods of the two:
。
The most according to claim 1, marine weak soil wave velocity testing method, it is characterised in that three borings are triangularly arranged, middle bore position is near the connecting line of other two borings, and the vertical line distance between connecting line is 5～10m；Spacing between each two boring is less than 20m.
3., according to weak soil wave velocity testing method marine described in right 1, it is characterised in that in its step one, need that the sleeve pipe placed is carried out wall thickness in advance and accurately measure.
4. state marine weak soil wave velocity testing method according to claim 3, it is characterised in that described wall thickness is accurately measured and referred to tilt to be placed in water by sleeve pipe, uses single-hole method accurately to record sleeve pipe p-and s-wave velocity, carry out the sleeve pipe velocity of wave correction of step 3.
5., according to weak soil wave velocity testing method marine described in right 1, it is characterised in that step one drilling construction carries out hole deviation degree test after terminating, and records actual measured results, according to actual measurement hole deviation, carry out the reception and transmission range correction of step 3.
6. according to weak soil wave velocity testing method marine described in right 1, it is characterized in that, the hole maritime interior waters impact correction of step 3: during longitudinal wave velocity test, electric spark excitation signal passes through sleeve pipe through sea water and propagates to along Rock And Soil arrive after reception borehole casing passes sea water receive cymoscope；During transverse wave speed test, down-hole shearing hammer is close to sleeve pipe and is excited, and the shear wave signal excited passes through sleeve pipe and propagates to be converted into after compressional wave signal passes hole maritime interior waters after reception borehole casing passes sleeve pipe arrive reception cymoscope along Rock And Soil.
7. according to weak soil wave velocity testing method marine described in right 1, it is characterised in that explosive source should keep placing vertically downward along drill center position with receiving cymoscope；Explosive source should keep same absolute altitude to place with receiving cymoscope.
8. according to weak soil wave velocity testing method marine described in right 1, it is characterized in that, during the arrival time pickup identified in step 3 Data processing, test record, P ripple and the identification of S ripple and contrast are according to following principle: the waveform of each recorded trace, amplitude and the similar features of vibration continuity degree；P ripple arrives feature prior to S ripple；P wave-amplitude is less than S wave-amplitude；The S wave characteristic cycle is at least the twice in P wave characteristic cycle；Forward and reverse when impulsing, S wave phase is contrary, P wave phase is identical；The pickup of compressional wave arrival time typically contrasts X-component and Y-component, and the pickup of shear wave first arrival time typically contrasts Z component, and contrast uses single-phase contrast or leggy contrast.
The most marine weak soil wave velocity testing method, it is characterised in that the compressional wave arrival time of pickup is first arrival time；And the shear wave arrival time picked up is generally first arrival time, when first arrival time is affected by the compressional wave wave train, shear wave arrival time uses the time of peak swing.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108267778A (en) * | 2018-01-04 | 2018-07-10 | 中国铁路设计集团有限公司 | A kind of formation velocity test system and test method |
| CN113219538A (en) * | 2021-04-29 | 2021-08-06 | 中国科学院武汉岩土力学研究所 | Rock-soil mass identification method and device based on while-drilling excitation wave parameters |
| CN113219538B (en) * | 2021-04-29 | 2022-06-07 | 中国科学院武汉岩土力学研究所 | Rock-soil mass identification method and device based on while-drilling excitation wave parameters |
| CN116972954A (en) * | 2023-09-25 | 2023-10-31 | 山东省地震工程研究院 | Rock-soil wave velocity measurement method and device based on in-situ excitation |
| CN116972954B (en) * | 2023-09-25 | 2023-12-19 | 山东省地震工程研究院 | Rock-soil wave velocity measurement method and device based on in-situ excitation |
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| CN105929450B (en) | 2018-01-02 |
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