CN103399341A - Application of engineering geophysical exploration technology to engineering investigation and foundation detection in reclamation areas - Google Patents
Application of engineering geophysical exploration technology to engineering investigation and foundation detection in reclamation areas Download PDFInfo
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Abstract
Application of engineering geophysical exploration technology to engineering investigation and foundation detection in reclamation areas is characterized in that the technology can realize geophysical exploration of super-thick backfill layers and basement rock depth in reclamation areas and backfill dynamic compaction detection. The specific contents are as follows: achieving geophysical exploration of super-thick backfill layers and basement rock depth in reclamation areas; adopting a rig sinker bar for excitation to increase the seismic source energy, wherein the sinker bar is 400-500 Kg in weight and 2-3 m in drop distance and is used for prospecting data of 15-40 m depth; achieving backfill dynamic compaction detection; (1) adopting a 200 Kg hammer for dynamic sounding to effectively penetrate 12 m gravelly soil fill stratum so as to visually obtain design parameters of coarse-grained composite soil plain fill before and after ground treatment; (2) combining the monitoring method and the multi-channel instantaneous surface wave method to effectively detect the dynamic compaction effect and accurately and quantitatively evaluate the influence depth, range and strength parameters of dynamic compaction.
Description
Technical field
The present invention relates to the application of Geophysical technique in reclaimation area engineering investigation and ground detection, this technology can realize that the physical prospecting prospecting of the huge thick backfill layer of reclaimation area and buried depth of bedrock and the processing of backfill soil strong rammer detect.
Background technology
In the artificial earthquake exploration, the multiple seismic event of Propagation after epicenter excitation around shot point, as ground roll and bulk wave (direct wave, refraction wave, reflection wave) and transformed wave thereof etc.Direct wave, refraction wave and reflection waves in many application seismic events were reconnoitred in the past, and ground roll is suppressed as harmful ripple, and above method investigation accuracy is low, can only qualitative analysis, and can not quantitative interpretation.Beijing water power physical prospecting research institute is through in a few years experimental study, develop the Multichannel Transient Surface Wave technology of applying in geotechnical engineering investigation, with its achievement, have the clear superiorities such as shallow layer exploration high resolving power, speed of detection are fast, easy construction, classify one of important means of geotechnical investigation as.
Multichannel Transient Surface Wave Method is to utilize Rayleigh Wave in the subsurface formations communication process, its amplitude depth attenuation, and energy is limited in a wavelength coverage substantially.Be the propagation characteristic reflection geologic condition situation of change in the horizontal direction of the ground roll of Same Wavelength, the geological condition of the propagation characteristic reflection different depth of the ground roll of different wave length.In the ground roll of homogeneous stratum surface excitation, the degree of depth that its different wave length component relates to, the medium elastic parameter is identical, thereby has identical velocity of propagation.In the stratum of elasticity delamination, the medium elastic parameter of different depth has difference, thereby the velocity of propagation of ground roll different wave length component is also different.The surface wave propagation speed of single wavelength (or single-frequency) component claims the phase velocity of this wavelength (or frequency), the variant frequency dispersion that is called of the phase velocity of different frequency.The Dispersion Characteristics of research level stratum ground roll, can be in the hope of the elastic parameter of inside, stratum different depth, and this is the ultimate principle of ground roll depth detecting method foundation namely.On ground, by hammering, fall heavy or explosive source, produce the Rayleigh Wave of certain frequency scope, then, by Analyzing the amplitude spectrum and phase spectral analysis, the R wave of different frequency in record is separated, thereby obtained V
R(f) curve or V
R(λ) curve, by interpretation process, can obtain the distribution of depth of stratum and surface wave speed.
In prior art, in the reclaimation area survey, reclaimation area artificial earth fill layer thickness is large, reaches the 12m left and right, and contains the bulk rubble more, and buried depth of bedrock is large, reaches the 35-40m left and right, and in prospecting, fill stratum thickness and buried depth of bedrock are two indexs that must obtain.The prospecting conventional method is probing, probing work difficulties is as follows: 1. retaining wall difficulty, because backfill layer is loose, complicated component and contain the bulk rubble and cause the retaining wall difficulty, the steel pipe retaining wall is met the bulk rubble and be can not get through, extract also difficulty, mud off often caves in again or leaks, and probing can't be carried out.2. bulk rubble impact in backfill layer, the bulk rubble that runs into while creeping in backfill layer can rock in backfill layer, and drilling tool is unable to eat power, is difficult to pass the bulk rubble.
For solving the probing difficulty, we adopt Multichannel Transient Surface Wave in geophysical prospecting technology to reconnoitre, but ground roll prospecting difficulties is as follows: when 1. normal ground roll was reconnoitred, man-made explosion was that 24 pounds of sledgehammers excite, accurately about prospecting depth 15-20m, but because place artificial earth fill's layer is loose, thickness is large, loose stratum is large to the consumption of man-made explosion energy, causes the man-made explosion energy to be difficult to reach the stratum in deep, and accurately prospecting depth only has the 10m left and right.2. how prospecting and field construction leveling are carried out simultaneously, and noise jamming impact in place is also very large, and during because of physical prospecting, the influence factor of maximum is vibrating noise.
In the prior art, the backfill soil strong rammer is processed and detected: reclaimation area artificial earth fill layer thickness is larger, mostly is and digs the macrosome mixing plain fill that bankets and cause in mountain, contains more bulk rubble.No matter be that main building adopts pile foundation, or less important building adopts subsoil, at first all will carry out suitable ground to fill stratum and process, and ground is processed the dynamic compaction methods that adopt more, but for the strong rammer treatment effect how, to never have more accurate detection means and evaluation criterion.Conventional detection method existing problems when strong rammer detects: 1. use load test method, detect the degree of depth very shallow, only have 2 meters left and right, can not react strong rammer and affect the degree of depth.2. use heavy type (63.5kg) or superduty dynamic sounding (120kg), all can not penetrate so thick rubble fill stratum, even pass once in a while, due to the bounce-back of rubble, also be difficult to react the effect of strong rammer.
Summary of the invention
The invention provides a kind of Geophysical technique of application in reclaimation area engineering investigation and ground detection, this technology adopts the Multichannel Transient Surface Wave Method prospecting to carry out the geology layering, auxiliary other measure again, can accurately reconnoitre deep formation, find out the buried depth of place artificial earth fill's layer thickness and bedrock surface, for earthquake resistant engineering design provides necessary parameter.
For achieving the above object, the present invention is achieved through the following technical solutions:
Geophysical prospecting technology in reclaimation area engineering investigation and ground detection, this technology can realize that the physical prospecting prospecting of the huge thick backfill layer of reclaimation area and buried depth of bedrock and the processing of backfill soil strong rammer detect, and particular content is as follows:
The physical prospecting prospecting of the huge thick backfill layer of reclaimation area and buried depth of bedrock:
1) gather 15 meters with interior data prospecting, adopt the Multichannel Transient Surface Wave in SWS type engineering investigation detector geophysical prospecting technology to reconnoitre, this ground roll prospecting man-made explosion is that 24 pounds of sledgehammers excite, and accurately prospecting depth is 10-20 rice;
2) the collection prospecting depth is the prospecting data of 15 meters-40 meters; Adopt the rig weight section to excite, strengthen seismic source energy, the heavy 400-500 kilogram of weight section, fall apart from 2-3 rice, and reception channel Shuo Wei 24 roads, sampling time interval are 0.5ms or 1ms, and track pitch is 2 meters; Adopting the mode of this kind increasing seismic source energy to gather prospecting depth is the prospecting data of 15 meters-40 meters;
The backfill soil strong rammer is processed and is detected:
1) adopt the 200Kg weight-adding hammer to carry out dynamic sounding, effectively penetrate 12 meters of gravelly soil fill stratums, intuitively obtain the design parameter that ground is processed the soil mixtures with giant grains plain fill of front and back;
2) adopt Multichannel Transient Surface Wave to detect the cipher round results that bankets before and after strong rammer, the degree of depth can surpass 20 meters, determines to banket and reinforces the degree of depth and the scope that relates to, and the forced ramming reinforcing effect is estimated;
3) above-mentioned two kinds of monitoring modes are combined, can effectively to the strong rammer treatment effect, detect, the affect degree of depth, scope, intensive parameter that strong rammer is processed are carried out to the accurate quantitative analysis evaluation.
Compared with prior art, the invention has the beneficial effects as follows:
This technology adopts the Multichannel Transient Surface Wave Method prospecting to carry out the geology layering, more auxiliary other measure, can accurately reconnoitre deep formation, finds out the buried depth of place artificial earth fill's layer thickness and bedrock surface, for earthquake resistant engineering design provides necessary parameter.
The physical prospecting prospecting of the huge thick backfill layer of reclaimation area and buried depth of bedrock: 1. strengthen seismic source energy, at first use the rig weight section to excite, the heavily about 400-500 kilogram of weight section, fall apart from 2-3 rice, reception channel Shuo Wei 24 roads, sampling time interval are 1ms or 0.5ms, and hits is 1024, track pitch is 2 meters, and offset distance is 10 meters and-56 meters.This kind method seismic source energy is large, not only can suppress the place noise, and can be delivered to the deep basement rock.Adopt this method can mark off backfill soil thickness and deep layer basement rock details.2. the multiple kinds of energy Information Monitoring is combined, carry out the ground roll test completing bore position, and borehole data contrasts, verification divides layer parameter.3. adopt this method to reduce probing quantity, reduced the prospecting expense, shortened the prospecting duration.
The backfill soil strong rammer is processed and detected: the weight-adding hammer of 1. having developed 200kg carries out dynamic sounding; effectively penetrate 12 meters of gravelly soil fill stratums; obtain intuitively ground and process the soil mixtures with giant grains plain fill design parameter of front and back, when reinforcement depth is estimated, obtained that formula correction factor of plum.2. utilize Multichannel Transient Surface Wave to detect the cipher round results that bankets before and after strong rammer, the degree of depth can surpass 20 meters, not affected by boulder in the soil mixtures with giant grains plain fill, determines to banket and reinforces the degree of depth and the scope that relates to, and the forced ramming reinforcing effect is estimated.3. on top layer, carry out load test.4. above several detection methods are combined, can effectively to the strong rammer treatment effect, detect, the affect degree of depth, scope, intensity that strong rammer is processed improve parameter and carry out quantitative evaluation.
The accompanying drawing explanation
Fig. 1 ground roll test Z-Vs figure.
Fig. 2 Seismic Imaging figure.
Fig. 3 dynamic compaction test ground roll detection curve comparison diagram.
Embodiment
1, project profile
Applicant has completed Bayuquan iron and steel project coking district, this steel enterprise of saddle Yingkou, the engineering geophysics prospecting of slab district and the ground roll testing of dynamic compaction test district.Coking district, slab district engineering geophysics prospecting are mainly the Multichannel Transient Surface Wave prospecting; The dynamic compaction test district mainly carries out the ground roll test job.
The prospecting, test purpose
This prospecting and test purpose mainly contain following some:
(1) coking district: reconnoitre and carry out the geology layering by Multichannel Transient Surface Wave, mainly find out the buried depth of place artificial earth fill's layer thickness and bedrock surface, each rock-soil layer auspicious Leibo velocity of wave and transverse wave speed are provided, carry out site classification, for earthquake resistant engineering design provides necessary parameter.The coking district geotechnical engineering investigation work duration is tight, workload is large, and because place artificial earth fill's layer thickness is large, and containing more bulk rubble, probing work is very difficult.Utilize the Multichannel Transient Surface Wave prospecting can carry out fast the geology layering, solve above difficulty.
(2) slab district (sea): because this district's buried depth of bedrock is more shallow, carry out the ground roll prospecting and mainly be to provide basement rock auspicious Leibo velocity of wave and transverse wave speed to bedrock weathering zone divide, site classification, for earthquake resistant engineering design provides design parameter; Solve simultaneously the query that exists in probing work.
(3) dynamic compaction test district: utilize Multichannel Transient Surface Wave to detect ground before and after strong rammer, understand the degree of banketing and encrypting before and after strong rammer, determine the degree of depth and scope that foundation stabilization relates to, the forced ramming reinforcing foundation consolidation effect is estimated.
2. prospecting, test foundation and the workload that completes
The standard technique file that this engineering geophysics work is carried out is: national sector standard " Multichannel Transient Surface Wave reconnaissance regulations " (JG/T143-2004) and " Hydraulic and Hydro-Power Engineering physical prospecting rules " (DL5010-92).
This prospecting, testing apparatus are many wave trains of SWS type digital picture engineering exploration and engineering detector.
The workload that completes:
Coking district: actual 45 ground roll prospecting points, collection 800 meters left and right of Seismic Imaging of completing.
Slab district: complete 6 ground roll prospecting points, gather 200 meters left and right of Seismic Imaging.
The dynamic compaction test district: 5 strong rammer check points are respectively chosen in two test sites, before and after strong rammer, to each check point, have carried out respectively detecting contrast, after before ramming, ramming, complete altogether 20 ground roll test points.
Place, coking district, due to the limitation that excites problem and ground roll prospecting means of special geologic condition, ambient noise interference, the transmission of man-made explosion energy, effective frequency, causes this place local location prospecting effect undesirable.Other zone prospecting and the ground roll testing of dynamic compaction test district have all obtained good effect.
2, data acquisition
(1) coking district: this place Multichannel Transient Surface Wave Method field acquisition system is:
Man-made explosion is that 24 pounds of sledgehammers excite, and reception channel Shuo Wei 24 roads, sampling time interval are 1ms or 0.5ms, and hits is 1024, and track pitch is 2 meters, and offset distance is 5 meters and-51 meters.The method multiplex in southern side, place buried depth of bedrock than the superficial part position, prospecting depth 10-20 rice.
For prospecting depth, be the degree of depth of 15 meters-40 meters, adopt the rig weight section to excite, the heavy 400-500 kilogram of weight section, fall apart from 2-3 rice, reception channel Shuo Wei 24 roads, sampling time interval are 1ms or 0.5ms, hits is 1024, and track pitch is 2 meters, and offset distance is 10 meters and-56 meters.
The dynamic compaction machinery weight excites, and hammer weighs 16 tons, falls apart from 3-4 rice, and reception channel Shuo Wei 24 roads, sampling time interval are 1ms or 0.5ms, and hits is 1024 or 2048, and track pitch is 2 meters, and offset distance is 30-40 rice left and right.The method is only used at the large place zone line of buried depth of bedrock (ground roll point numbering 9,10,11,12,13,14,260,261,262,263,264,265), belongs to test character.
(2) slab district: this place Multichannel Transient Surface Wave Method field acquisition system is:
Man-made explosion is that 24 pounds of sledgehammers excite, and reception channel Shuo Wei 24 roads, sampling time interval are 1ms or 0.5ms, and hits is 1024, and track pitch is 2 meters, and offset distance is 5 meters and-51 meters.
(3) dynamic compaction test district:
Each strong rammer district chooses 5 check points, and each check point carries out respectively the ground roll test before rammer with after ramming, and after same check point rammed front and rammer, the ground roll test position was all identical with acquisition system.
Dynamic compaction test district Multichannel Transient Surface Wave Method field acquisition system is:
Man-made explosion is that 24 pounds of sledgehammers excite, and reception channel Shuo Wei 24 roads, sampling time interval are 1ms or 0.5ms, and hits is 1024, and track pitch is 1 meter, and offset distance is 5 meters and-51 meters.
3, data is processed and Interpretation On The Results
1. data is processed
Processing to the Multichannel Transient Surface Wave data generally was divided into for two stages: process in (1) field, and (whether main inspection of data reaches prospecting depth namely at the scene the record that gathers to be carried out to pre-service; Whether exist the focus of surrounding environment to disturb), find that end meets the prospecting purpose, mend and survey immediately, strictly control the quality of the firsthand information.(2) data that gathers is carried out to interior industry and arrange explanation.Finally carry out comprehensive summarizes and draw the colored sectional view of uniform velocity, and make geologic section and interpretation results.In following article, the data in industry stage is processed, and key step is summarized as follows:
1. source book is arranged and check, edit and record, 2. by special software, show the record that gathers, analyze the time-space domain distribution characteristics of compressional wave and ground roll and basic terrace ripple, 3. on seismogram, by manual analysis, choose upper dividing value V1 and lower bound V2 and corresponding time and the locus thereof of ground roll apparent velocity (being ground roll linear group speed), while determining ground roll ()-empty () the territory window, for data in next step frequency-wavenumber domain, process the ground roll data are provided, 4. according to above-mentioned definite window, by a peacekeeping two dimension Fourier transform by the time-the spatial domain data are transformed into frequency (F)-wave number (K) territory, obtain F-K territory two dimension spectral amplitude image, extraction ground roll frequency-wavenumber domain in, 5. on said frequencies-wave number spectral amplitude image, by choosing of ground roll edge frequency and velocity of wave, determine ground roll frequency-wavenumber domain window, the peak coordinate (Kxi, Kyi) of this frequency of automatic Picking (fi) wave spectrum in window, by V
ki=2 π f
i/ (K
xi 2+ K
yi 2)
1/2obtain the phase velocity V of different frequency
ki, obtain the phase velocities dispersion curve (V of an actual measurement
k-f), after the formation dispersion curve, deposit, 6. the ground roll isoline along search carries out Coherent addition on spectral amplitude, i.e. filtering is processed, and improves the dispersion curve looks, and the distribution range of ground roll in definite F-K territory, for obtaining dispersion curve more accurately, provides foundation, 7. from the maximum value of above-mentioned isogram, pick up the phase differential of every kind of frequency, calculate dispersion curve, determine the thickness of each layer, calculate the shear wave propagation speed of each layer, and carry out the inverting process of fitting treatment to obtaining result, 8. according to the actual measurement dispersion curve form (flex point that 7. calculates, frequency, the features such as the density of frequency dispersion point) carry out the geology layering, press layer layer parameter definitely, take this structure parameters of soil layer (comprising bed thickness and speed etc.) as model, utilize optimization algorithm, calculate theoretical dispersion curve, with measured curve, compare, repeatedly revise structure parameters of soil layer, calculate again theoretical dispersion curve, make two dispersion curve matches obtain best (fitting coefficient is reached more than 0.9), the match mode can be automatic Fitting, also but manual intervention adjustment parameter is carried out match, finally be finally inversed by structure parameters of soil layer more accurately, and be labeled on figure, institute's target speed is the stratum shear wave velocity, 9. the dispersion curve of quantitative interpretation utilized to the colored sectional view of SWS ground roll Software on Drawing ground roll uniform velocity, then forward under CAD software and divide stratum and carry out geology layering explanation according to each speed parameter.
2. Interpretation On The Results
By data, process, by surface wave frequency dispersion curve inverting match each measuring point subsurface formations thickness (also can be scaled the bed boundary elevation) and stratum shear wave velocity, by above-mentioned zone thickness value (or elevation) and formation velocity value spread to measuring point (horizontal direction)-elevation (vertical direction) section.According to the size of velocity amplitude, stratum is divided, will be considered as same bed boundary along the close depth point of speed on line direction, then by artificial or computer drawing ground roll Exploration profile figure.
Due to ground roll and shear wave propagation speed tool correlativity, therefore by in-situ test, obtain ground roll velocity of wave V
RAfter, can pass through formula V
S=(1+ σ) V
R/ (0.87+1.2 σ) (wherein σ is Poisson ratio) tries to achieve the shear wave velocity Vs that needs in engineering, although in reduction formula by another parameter (number)-Poisson ratioσ, but in Quaternary Strata, σ generally changes in 0.25-0.50 scope, the maximum relative error of Vs value is 8.7% in this σ scope, the impact of σ is so little, in the engineering application, can ignore (SWS software has been revised the Vs value) fully.
The coking district: ground roll stratigraphic division and each floor auspicious Leibo velocity of wave and shear wave (shearing wave) velocity of wave, refer to ground roll-geologic interpretation achievement sectional view.
By data interpretation, it is substantially close with results of drilling that we find that ground roll is divided stratigraphic horizon, but both are incomplete same, because the stratigraphic boundary that probing reflects is the geology boundary from petrostratigraphy, biostratigraphy, tectostratigraphy angular divisions; And engineering geophysics (ground roll) reflects, be a kind of physico-mechanical properties on stratum, with stratum soft or hard (rigidity) difference, divide stratigraphic boundary.The artificial earth fill interface that this place ground roll is divided is basic identical with results of drilling, and the interface of basement rock buried depth of dividing is larger than probing prospecting result.The reason that causes this result is because this place buried depth of bedrock is large, the severely-weathered layer thickness of local basement rock is large, and severely-weathered layer velocity of wave is unlike the rubble floor height of top Quaternary system, even will be lower than top metalling velocity of wave, so this place ground roll prospecting obvious interface just occurs at middle weathering horizon d.
The coking district is because artificial earth fill's floor is loose, and buried depth of bedrock is large, and loose stratum is large to the consumption of man-made explosion energy, causes the man-made explosion energy to be difficult to reach the horizon d in deep, and place noise jamming impact simultaneously is also very large.We have attempted some and have strengthened the method for man-made explosion energy, such as utilizing the dynamic compaction machinery weight as epicenter excitation, this kind method seismic source energy is large, not only can suppress the place noise, and can be delivered to the deep basement rock, but find that through data interpretation the signal of the method generation is single, low frequency wave is more, frequency band is narrower, causes resolution characteristic low, can't carry out accurate layering.Therefore utilize the prospecting district of dynamic compaction machinery weight as epicenter excitation, we provide artificial earth fill and interface of basement rock, and Quaternary Strata is only simply divided.
This engineering geophysics survey mainly concentrates on southern side, place and middle part, place, and is as follows by engineering geophysics integrated interpretation coking district's stratal configuration and each floor velocity of wave:
The southern side, place:
Artificial earth fill's layer: thickness 5-7m, auspicious Leibo speed Vr=140-170m/s; Shear wave velocity Vs=150-180m/s;
The Quaternary system overlayer: thickness is the 10-20m left and right, auspicious Leibo speed Vr=170-280m/s; Shear wave velocity Vs=180-300m/s;
Basement rock: severely-weathered mixed rock buried depth is mostly the 15-25m left and right, auspicious Leibo speed Vr=480-650m/s; Shear wave velocity Vs=500-700m/s; Middle weathering mixed rock buried depth is mostly the 25-30m left and right, auspicious Leibo speed Vr=800-1000m/s; Shear wave velocity Vs=900-110m/s;
Middle part, place: (this survey mainly concentrates on this zone)
Artificial earth fill's layer: thickness 10-12m, auspicious Leibo speed Vr=140-160m/s; Shear wave velocity Vs=150-170m/s;
The Quaternary system overlayer: thickness is the 20-25m left and right, auspicious Leibo speed Vr=180-450m/s; Shear wave velocity Vs=190-480m/s;
Basement rock: severely-weathered mixed rock buried depth is mostly the 30-35m left and right, auspicious Leibo speed Vr=480-650m/s; Shear wave velocity Vs=500-700m/s; Middle weathering mixed rock buried depth is mostly the 35-40m left and right, auspicious Leibo speed Vr=800-1000m/s; Shear wave velocity Vs=900-1100m/s.
Slab district: ground roll stratigraphic division and each floor auspicious Leibo velocity of wave and shear wave (shearing wave) velocity of wave, meeting ripple test Z-Vs figure.
This Slag scar big rise and fall, utilize the single means of ground roll to explain that effect is undesirable, and ground roll prospecting and two kinds of prospecting means of Seismic Imaging are combined, and effect is very good.On the corresponding earthquake map of bedrock surface buried depth, be the 90-100ms left and right, from the ground roll data, can judge that the severely-weathered layer of this place basement rock is thinner.
As follows by engineering geophysics integrated interpretation slab district's stratal configuration and each floor velocity of wave:
Artificial earth fill's layer: thickness 5-11m, auspicious Leibo speed Vr=140-150m/s; Shear wave velocity Vs=145-160m/s;
Basement rock: severely-weathered mixed rock buried depth is mostly the 5-11m left and right, auspicious Leibo speed Vr=450-600m/s; Shear wave velocity Vs=500-650m/s; Middle weathering mixed rock buried depth is mostly the 7-13m left and right, auspicious Leibo speed Vr=800-1000m/s; Shear wave velocity Vs=850-1060m/s left and right.
Utilize Multichannel Transient Surface Wave to detect artificial earth fill's cipher round results before and after strong rammer, determine to banket and reinforce the degree of depth and the scope that relates to, the forced ramming reinforcing effect is estimated.Because ground roll check point position after ramming before the dynamic compaction test rammer is identical, sampling parameter is identical, and therefore two dispersion curve joinings overlap with lower curve, more than joining, are the strong rammer effective reinforcement depth.
From on dynamic compaction test ground roll detection curve comparison diagram (coking district) and dynamic compaction test ground roll detection curve comparison diagram (slab district), can directly seeing strong rammer effective reinforcement depth, consolidation effect, reinforcing scope.
After before by ground roll, ramming, ramming, curve comparison is differentiated:
Coking district strong rammer effective reinforcement depth is 8-10m, and auspicious Leibo speed is brought up to 250-280m/s from 160-170m/s;
Slab district strong rammer effective reinforcement depth is 6-9m, and auspicious Leibo speed is brought up to 180-200m/s from 150-160m/s.
4, conclusion
By early stage survey can obtain following preliminary concluding remarks were:
(1) to have the shallow layer exploration precision high for its achievement of Multichannel Transient Surface Wave technology, the advantages such as field detection speed is fast, easy construction.
(2) the ground roll exploration means also has its limitation, and limited by Geological condition and environmental baseline.Therefore must combine with other engineering geophysics means, and probing combines.
The geophysical prospecting technology of the present invention in reclaimation area engineering investigation and ground detection, through the test of many times checking, this technology can realize that the physical prospecting prospecting of the huge thick backfill layer of reclaimation area and buried depth of bedrock and the processing of backfill soil strong rammer detect.
The physical prospecting prospecting of the huge thick backfill layer of reclaimation area and buried depth of bedrock:
1) gather 15 meters with interior data prospecting, adopt the Multichannel Transient Surface Wave in SWS type engineering investigation detector geophysical prospecting technology to reconnoitre, this ground roll prospecting man-made explosion is that 24 pounds of sledgehammers excite, and accurately prospecting depth is 10-20 rice;
2) the collection prospecting depth is the prospecting data of 15 meters-40 meters; Adopt the rig weight section to excite, strengthen seismic source energy, the heavy 400-500 kilogram of weight section, fall apart from 2-3 rice, and reception channel Shuo Wei 24 roads, sampling time interval are 0.5ms or 1ms, and track pitch is 2 meters; Adopting the mode of this kind increasing seismic source energy to gather prospecting depth is the prospecting data of 15 meters-40 meters;
The backfill soil strong rammer is processed and is detected:
1) adopt the 200Kg weight-adding hammer to carry out dynamic sounding, effectively penetrate 12 meters of gravelly soil fill stratums, intuitively obtain the design parameter that ground is processed the soil mixtures with giant grains plain fill of front and back;
2) adopt Multichannel Transient Surface Wave to detect the cipher round results that bankets before and after strong rammer, the degree of depth can surpass 20 meters, determines to banket and reinforces the degree of depth and the scope that relates to, and the forced ramming reinforcing effect is estimated;
3) above-mentioned two kinds of monitoring modes are combined, can effectively to the strong rammer treatment effect, detect, the affect degree of depth, scope, intensive parameter that strong rammer is processed are carried out to the accurate quantitative analysis evaluation.
Claims (1)
1. the application of Geophysical technique in reclaimation area engineering investigation and ground detection, is characterized in that, this technology can realize that the physical prospecting prospecting of the huge thick backfill layer of reclaimation area and buried depth of bedrock and the processing of backfill soil strong rammer detect, and particular content is as follows:
The physical prospecting prospecting of the huge thick backfill layer of reclaimation area and buried depth of bedrock:
1) gather 15 meters with interior data prospecting, adopt the Multichannel Transient Surface Wave in SWS type engineering investigation detector geophysical prospecting technology to reconnoitre, this ground roll prospecting man-made explosion is that 24 pounds of sledgehammers excite, and accurately prospecting depth is 10-20 rice;
2) the collection prospecting depth is the prospecting data of 15 meters-40 meters; Adopt the rig weight section to excite, strengthen seismic source energy, the heavy 400-500 kilogram of weight section, fall apart from 2-3 rice, and reception channel Shuo Wei 24 roads, sampling time interval are 0.5ms or 1ms, and track pitch is 2 meters; Adopting the mode of this kind increasing seismic source energy to gather prospecting depth is the prospecting data of 15 meters-40 meters;
The backfill soil strong rammer is processed and is detected:
1) adopt the 200Kg weight-adding hammer to carry out dynamic sounding, effectively penetrate 12 meters of gravelly soil fill stratums, intuitively obtain the design parameter that ground is processed the soil mixtures with giant grains plain fill of front and back;
2) adopt Multichannel Transient Surface Wave to detect the cipher round results that bankets before and after strong rammer, the degree of depth can surpass 20 meters, determines to banket and reinforces the degree of depth and the scope that relates to, and the forced ramming reinforcing effect is estimated;
3) above-mentioned two kinds of monitoring modes are combined, can effectively to the strong rammer treatment effect, detect, the affect degree of depth, scope, intensive parameter that strong rammer is processed are carried out to the accurate quantitative analysis evaluation.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107356668A (en) * | 2016-05-10 | 2017-11-17 | 北京市水利规划设计研究院 | A kind of detection method of safety of dam body identification |
| CN111856555A (en) * | 2020-06-19 | 2020-10-30 | 同济大学 | Underground detection method based on surface wave multi-scale window analysis |
| CN113638454A (en) * | 2021-06-04 | 2021-11-12 | 杭州交通投资建设管理集团有限公司 | Dynamic compaction treatment method for karst foundation |
| CN113435022A (en) * | 2021-06-18 | 2021-09-24 | 中国电建集团华东勘测设计研究院有限公司 | Rock-soil body parameter two-dimensional space variability characterization method based on multi-channel surface wave exploration |
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