CN109541025A - Time-domain based on pseudo-random signal is superimposed surface wave detection method - Google Patents
Time-domain based on pseudo-random signal is superimposed surface wave detection method Download PDFInfo
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Abstract
The time-domain based on pseudo-random signal that the invention discloses a kind of is superimposed surface wave detection method, and step 1 obtains pseudo-random signal, and the pseudo-random signal of acquisition must be directional, and pseudo-random signal is that Whole frequency band is distributed or frequency range is in 1Hz-1000Hz；The mode for obtaining pseudo-random signal is the vibrating noise of automobile, flow velocity is vibrating noise or the artificial vibrating noise that loads greater than the river 2m/s；Step 2, the pseudo-random signal that will acquire carry out t-p transformation, when acquisition m- speed domain signal；Step 3, to acquisition it is described when m- speed domain signal when m- speed domain be overlapped, i.e., carry out a Fourier transform in time-domain, time-domain be converted into frequency domain, obtains frequency-speed domain signal.Advantage of the present invention is embodied in detection accuracy height, and consistency is good, and in same point, its error of the speed of different time test acquisition is respectively less than 10%, and precision is very high, can be used as the validity test means of detection.
Description
Technical field
The present invention relates to engineering investigations and the lossless inspection of construction quality, folded more particularly, to the time-domain based on pseudo-random signal
Add surface wave detection method.
Background technique
In engineering investigation and construction quality non-destructive testing, velocity of wave is a particularly significant and sufficiently stable parameter, right
In it is architectonic characterization and it is smaller by external influences for the characterization of target body characteristics, the signal stabilization of acquisition is
A kind of important detection and detection means.Especially in construction quality non-destructive testing, speed is become by factors such as outside climatic, environment
If change is little, therefore the speed of correlation engineering does not change over a period to come, speed is stable, therefore utilizes speed
Spending to the quality progress relevant evaluation of engineering is also a kind of important detection technique, such as backfill is evaluated using the promotion of speed
Grouting quality etc..
Surface wave is then a kind of important means lossless, that VELOCITY DISTRIBUTION in the certain depth of underground is obtained by ground, at present
Common predominantly hammering Transient Surface Wave detection and the detection of natural source surface wave, but the two has certain problems, and is not enough to full
Foot is at present to the related request of detection.
In terms of Transient Surface Wave, general explosive is no longer applied to surface wave and detects, and the surface wave Detection Techniques effective depth of hammering
It is generally individually smaller than 30m, effective depth is generally less than 20m especially in soil layer, and related frequency dispersion spectrum is wider, and depth speed is caused to be picked up
Take it is very unstable, in engineering application be extremely limited.
In terms of natural source wave technology, although investigation depth is larger, observation system arrangement is complicated, and general requirement is three-dimensional
Arrangement, this arrangement are high to coordinate requirement, and arrange that the time is slower, require observation time high.The natural source face of one point
Wave detection, the general used time is all larger than 1h, and this to be arranged in most places be ungratified.Such as use pseudo-linear arrangement side
Formula has certain error with its speed obtained in practice theoretical, these result in this technology and reconnoitre in Practical Project
With can not large-scale promotion in quality testing application process.
Summary of the invention
It is an object of that present invention to provide a kind of, and the time-domain based on pseudo-random signal is superimposed surface wave detection method.
To achieve the above object, the present invention takes following technical proposals:
Time-domain of the present invention based on pseudo-random signal is superimposed surface wave detection method, includes the following steps:
Step 1 obtains pseudo-random signal, and the pseudo-random signal of acquisition must be directional, and pseudo-random signal is Whole frequency band
Distribution or frequency range are in 1Hz-1000Hz；The mode for obtaining pseudo-random signal is the vibrating noise of automobile, flow velocity is big
Vibrating noise or the artificial vibrating noise that loads in the river 2m/s；
Step 2, the pseudo-random signal that will acquire carry out t-p transformation, when acquisition m- speed domain signal；
Step 3, to acquisition it is described when m- speed domain signal when m- speed domain be overlapped, i.e., carried out in time-domain primary
Time-domain is converted to frequency domain, obtains frequency-speed domain signal by Fourier transform.
The flow velocity is greater than the vibrating noise in the river 2m/s between 0.5Hz-50Hz.
Advantage of the present invention is embodied in following several respects:
(1) comprehensive advantage of detection efficient and investigation depth is big: conventional detection work aspect, investigation depth and detection efficient are general
There are certain contradictions.Such as hammer transient surface wave technology, detection efficient is high but investigation depth is shallow, natural source surface wave investigation depth it is big but
Detection efficient is very low, and the present invention then preferably resolves this contradiction.
It is detected relative to traditional hammering Transient Surface Wave, such as in the soil layer of approximate transverse wave speed about 150m/s-300m/s,
The effective detecting depth of conventional hammering Transient Surface Wave is generally less than 20m, and effective detecting depth of the present invention about 60m to 70m it
Between.And in relevant lithostratigraphy, according to arrangement size, correlation detection depth can be more than rice up to a hundred, but working efficiency is not
It is excessive to reduce.
Relative to the biggish natural source wave technology of investigation depth, observed efficiency of the present invention is significantly improved.As natural source is wanted
The smaller speed of observation error need to arrange three-dimensional arrangement, and the acquisition time of a point about 20min, in addition arrangement the latter point
Observation time about 1h, and the three-dimensional regions such as most mountainous regions that are arranged in are unsuitable, therefore engineering significance is little.
(2) detection accuracy is high, and consistency is good: general Transient Surface Wave, due to being influenced by excitation energy, relevant frequency
Scattered axis is wide, causes the pickup precision of speed overall not high.And natural source surface wave is influenced excessive, same place two by the direction of wave
Secondary acquisition, if any the direction of propagation difference of apparent wave, may cause speed, there is also certain errors.The present invention is then effective
This problem is avoided, in same point, speed its error that different time test obtains is respectively less than 10%, and precision is very high, can be with
Validity test means as detection.
Detailed description of the invention
Fig. 1 is the time-domain superposition schematic diagram in pseudorandom of embodiment of the present invention source.
Specific embodiment
It elaborates with reference to the accompanying drawing to the embodiment of the present invention, the present embodiment before being with technical solution of the present invention
It puts and is implemented, the detailed implementation method and specific operation process are given, but protection scope of the present invention is not limited to down
State embodiment.
Time-domain of the present invention based on pseudo-random signal is superimposed surface wave detection method, carries out as steps described below:
Shown in step 1, Fig. 1 (1), for a pseudo-random signal of acquisition, this signal must be first it is directive, secondly most
It is Whole frequency band distribution or frequency range well between 1Hz-1000Hz.The acquisition modes of the pseudo-random signal be it is various, can
With the vibrating noise that is automobile, (such as Shenzhen Qian Hai Geophysical Work, the vibration of a large amount of heavy goods vehicles in the Shenzhen and Hong Kong main road utilized provide low
Frequency vibration noise, frequency is between 0.5Hz-50Hz), the vibration that can be larger (general flow velocity the is greater than 2m/s) river of flow velocity is made an uproar
(such as Xinjiang summer Ji Geophysical Work, due to above there is the influence of reservoir, flow velocity of river is generally greater than 3m/s to sound, and due to river week
It is with stone, certain vibration easy to form, coupled vibration frequency is between 3Hz-50Hz), it is also possible to artificially to load
(village Ru Xin reservoir, Jinan wear the engineerings such as Huang, good fortune rice, Sang De to vibrating noise, using artificial bump focus, obtain 1Hz-
The broadband vibration signal of 1000Hz).But this noise must be orientation, the speed otherwise obtained be it is insecure with
And detection achievement is easy to appear false anomaly.Since the noise of load is not existing for completely random, because of referred to herein as pseudo-random signal.
Shown in step 2, Fig. 1 (2), carry out the transformation such as t-p, when acquisition m- speed (slowness) domain signal, Fig. 1 (2) box
Shown in be the when m- speed domain signal once vibrated, acquired signal is consistent with existing hammering Transient Surface Wave detection
, as shown in Fig. 1 (3).And the features of the present invention is that and obtains many such signals, and such signal direction of vibration is
Consistent, i.e., rate uniformity is high, therefore can effectively be overlapped in time-domain.
Step 3, to signal when m- speed domain be overlapped, i.e., a Fourier transform is carried out in time-domain, by the time
Domain is converted to frequency domain, can obtain the frequency as shown in Fig. 1 (4)-speed domain signal.
The single in pseudorandom source, which vibrates, can carry certain high-frequency information, and the interval between random vibration, then carries
Effective low frequency signal information, i.e. low frequency insert frequency signal；Due to the full covering of this high and low frequency, detection can be effectively realized
The full covering of depth, to effectively improve investigation depth；And temporal superposition, extraneous disturbing factor is (such as list in principle
The ambient noise of secondary hammering interferes) become smaller, speed is more stable, therefore its precision is higher.
Claims (2)
1. a kind of time-domain based on pseudo-random signal is superimposed surface wave detection method, it is characterised in that: include the following steps:
Step 1 obtains pseudo-random signal, and the pseudo-random signal of acquisition must be directional, and pseudo-random signal is Whole frequency band
Distribution or frequency range are in 1Hz-1000Hz；The mode for obtaining pseudo-random signal is the vibrating noise of automobile, flow velocity is big
Vibrating noise or the artificial vibrating noise that loads in the river 2m/s；
Step 2, the pseudo-random signal that will acquire carry out t-p transformation, when acquisition m- speed domain signal；
Step 3, to acquisition it is described when m- speed domain signal when m- speed domain be overlapped, i.e., carried out in time-domain primary
Time-domain is converted to frequency domain, obtains frequency-speed domain signal by Fourier transform.
2. the time-domain based on pseudo-random signal is superimposed surface wave detection method according to claim 1, it is characterised in that: described
Flow velocity is greater than the vibrating noise in the river 2m/s between 0.5Hz-50Hz.
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