CN1122449A - Superficial exploration method using elastic wave reflex - Google Patents
Superficial exploration method using elastic wave reflex Download PDFInfo
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- CN1122449A CN1122449A CN 94117668 CN94117668A CN1122449A CN 1122449 A CN1122449 A CN 1122449A CN 94117668 CN94117668 CN 94117668 CN 94117668 A CN94117668 A CN 94117668A CN 1122449 A CN1122449 A CN 1122449A
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Abstract
Geophone receiving reflex wave is mounted at or near shock point and is set at single point or equidistantly. The shock point and the geophone point move synchronously along set profile to collect data, which are stored in computer and real-time processed to obtain the profile at time to. By stimulating high-freq elastic wave, reflex wave high than 150 Hz is collected, and through band pass filteration of different bands, low-freq, subhigh-freq and high-freq signals are extracted separately so as to distinguish main reflector, lamellar surface and small-wave impedance surface of discontinuity.
Description
The present invention relates to a kind of superficial exploration method that utilizes elastic wave reflex, it is applicable to the high resolving power fine geology exploration of shallow-layer, also is applicable to the detection of concrete component, belongs to the physical prospecting technical field.
At present, the method that general shallow-layer high precision seismic reflection technology is explored, near exciting point, through compressional wave, through shear wave, ground roll, sound wave arrive prior to reflection wave, form strong the interference, so need being set, wave detector receives reflection wave outside vibration source is put certain distance, the offset distance that promptly needs to consider suitable size window when selecting the best.The reflection wave time curve of the same reflecting surface that the different time that utilization receives arrives carries out lineups contrast, apparent velocity contrast, to carry out qualitative interpretation; And make T-X curve or with methods such as level stacks data is handled, carry out quantitative interpretation.When the utmost point shallow layer exploration, occur wide corner reflection with said method inevitably, reflected energy is greatly weakened, incident wave and reflection wave pass the length increasing of inhomogeneous medium simultaneously, and the record looks are worsened, and when the work-yard is narrow, because length profile is not enough, data deficiencies, the method for many data processing can not adopt, its application is restricted, simultaneously, the frequency of use is not high enough, and wavelength is bigger than normal, resolution is not enough, influences measuring accuracy.
The purpose of this invention is to provide a kind of narrow restriction in work-yard that is not subjected to, be applicable to the high-resolution shallow-layer geologic prospecting method of utilizing the elasticity reflection of different medium.
The present invention realizes like this, locating to settle wave detector to receive reflection wave near impulsing, and making the receiving range that is excited to of each measuring point, to equate to make what received be the reflection wave that is bordering on the vertical reflection face, then move successively and impulse a little and geophone station along the section of setting, carry out data acquisition, deposit the data of each measuring point in computing machine, gather in real time then and handle, directly get the to time section; Use the higher-frequency composition of elastic wave,, promptly adopt extremely short aftershock, high frequency, highly sensitive wave detector to cooperate the reflection wave that is higher than 150Hz with collection with corresponding seismograph to improve resolution; When Data Processing, bandpass filtering by different frequency range, the signal that extracts low frequency respectively is with outstanding main reflecting surface, the signal of inferior high frequency is to differentiate the aspect of thin layer, the signal of high frequency is to detect very little or as thin as a wafer the wave impedance discontinuity surface of volume, and this method has satisfied the requirement of shallow-layer and even the exploration of utmost point shallow-layer high resolving power.
The embodiment that further specifies this kind method of exploration is provided below in conjunction with accompanying drawing.
Accompanying drawing is the testing diagrammatic cross-section.
Among the figure: 1-point position, 2-measured object surface, 3-incident wave direction, 4-reflection wave direction, 5-test layer.
Embodiment 1
Use FY-20 transient floating point to amplify engineering seismograph (dynamic range 90db, minimum sampling interval 15 μ ε, frequency response 10-4000Hz takes 286 system controlled by computer by making) and (optimal frequency response 50-4000Hz) is laid successively by each equidistant measuring point shown in the point position 1 on measured object surface 2 to lack the aftershock wave detector with the piezo crystal of preposition amplification.Impulse with the hammering focus, (record time-delay ≯ 15 μ ε) make incident wave arrive test aspect 5 along incident wave direction 3, and reflection wave then returns measured surface 2 along reflection wave direction 4, is received by the wave detector single track, impulses and a little moves along section synchronously with acceptance point.To choose 200Hz-3000Hz band logical for the filtering shelves during measurement.Each measuring point adopts vertical superposition to measure, and the data that each measuring point is gathered deposit computing machine in, after section has been surveyed, the time curve of each measuring point on the section is converged into the to time section, carries out filtering again, and technical finesses such as equilibrium obtain the testing result.
Use the microcomputer sonic apparatus, adopt the frequency of 10KH-100KH, on measured object surface 2, press each measuring point place shown in the equidistant point position 1, piezoelectric sensor with self-excitation, reception is certainly launched sound pulse, receive reflection wave, or use single piezoelectricity to end body electroacoustic switching emission sensor and make focus, another sensor receives, and emission and receiving sensor are at a distance of 1-2cm.Emission is moved along survey line simultaneously with receiving sensor and is measured, the time curve of each measuring point is deposited in the microcomputer of sonic apparatus, and then the time curve of each measuring point of a section converged into the to time section, and carry out technical finesses such as filtering, modification, obtain result of detection to the thinner layer object.
Claims (2)
1, a kind of superficial exploration method that utilizes elastic wave reflex, it is characterized in that, on impulsing a little or near it wave detector is installed and is received reflection wave, adopt single-point or near impulsing a little, geophone station a little equidistantly is set with impulsing, impulse a little with geophone station along the synchronous mobile collection data of setting of section, deposit computing machine in, gather then to handle in real time and obtain the to time section.
2, superficial exploration method according to claim 1, it is characterized in that: excite the high frequency elastic wave and utilize extremely short aftershock, high frequency, high sensitivity wave detector to cooperate with corresponding seismograph, the reflection wave that is higher than 150Hz with collection, bandpass filtering by different frequency range, extract low frequency or inferior high frequency or high-frequency signal respectively, with the aspect of differentiating main reflecting surface or thin layer or little wave impedance discontinuity surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94117668 CN1122449A (en) | 1994-11-01 | 1994-11-01 | Superficial exploration method using elastic wave reflex |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94117668 CN1122449A (en) | 1994-11-01 | 1994-11-01 | Superficial exploration method using elastic wave reflex |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1122449A true CN1122449A (en) | 1996-05-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94117668 Pending CN1122449A (en) | 1994-11-01 | 1994-11-01 | Superficial exploration method using elastic wave reflex |
Country Status (1)
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| CN (1) | CN1122449A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102087368A (en) * | 2010-09-25 | 2011-06-08 | 钟世航 | Method for measuring wave speed with reflection method with approximate source-geophone distance |
| CN105891873A (en) * | 2016-06-17 | 2016-08-24 | 钟世航 | Method for exploring fluid and gas in underground rock mass by adopting elastic wave reflection method |
| CN106019372A (en) * | 2016-05-26 | 2016-10-12 | 重庆大学 | Seismic wave propagation speed acquiring method, depth measuring method and seismic wave observation system |
-
1994
- 1994-11-01 CN CN 94117668 patent/CN1122449A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102087368A (en) * | 2010-09-25 | 2011-06-08 | 钟世航 | Method for measuring wave speed with reflection method with approximate source-geophone distance |
| CN102087368B (en) * | 2010-09-25 | 2012-12-05 | 钟世航 | Method for measuring wave speed with reflection method with approximate source-geophone distance |
| CN106019372A (en) * | 2016-05-26 | 2016-10-12 | 重庆大学 | Seismic wave propagation speed acquiring method, depth measuring method and seismic wave observation system |
| CN106019372B (en) * | 2016-05-26 | 2018-01-05 | 重庆大学 | Seismic wave propagation speed acquisition methods, depth detecting method and seismic wave observation system |
| CN105891873A (en) * | 2016-06-17 | 2016-08-24 | 钟世航 | Method for exploring fluid and gas in underground rock mass by adopting elastic wave reflection method |
| CN105891873B (en) * | 2016-06-17 | 2018-07-17 | 钟世航 | A method of using fluid and gas in elastic wave reflex method Underground rock mass |
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