CN207176660U - A kind of bar shaped probe for detecting bury shear stress - Google Patents
A kind of bar shaped probe for detecting bury shear stress Download PDFInfo
- Publication number
- CN207176660U CN207176660U CN201720937075.1U CN201720937075U CN207176660U CN 207176660 U CN207176660 U CN 207176660U CN 201720937075 U CN201720937075 U CN 201720937075U CN 207176660 U CN207176660 U CN 207176660U
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- bar shaped
- bury
- shear stress
- feeler lever
- probe
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Abstract
The utility model belongs to ocean engineering soil investigation, soil exploration field, disclose a kind of bar shaped probe for detecting bury shear stress, bar shaped probe includes bar shaped termination, the rectangular cross-sectional center of bar shaped termination is connected with feeler lever, screw thread is provided with the top of feeler lever, feeler lever lower end is provided with load cell close to the bar shaped termination, and load cell selects resistance-type force snesor or Optical Fiber Force Sensor；The width of bar shaped termination is 2 8cm, length is width at least 5 times, thickness be 0.5 1cm.Bar shaped probe failure mechanism of the present utility model can eliminate the influence of cladding earth pressure and pore water pressure, without additional correction；Bar shaped pops one's head in projected area than bevel-type probe greatly, can obtain more accurate shear stress；Bar shaped, which is popped one's head between penetration resistance and bury shear stress, has strict Theory Solution, so as to greatly reduce influence of the artificial sense datum to result of calculation.
Description
Technical field
The utility model belongs to ocean engineering soil investigation, soil exploration field, is to be related to one kind to be used to detect bury specifically
The static sounding probe in situ of shear stress.
Background technology
China's current standard provides that the region for being more than 500 meters of depth of water is referred to as " abysmal area ".Ocean engineering structure in deep-sea
It is very different in structure type, force-bearing characteristics, basic property etc. and shallow sea works, to the soil body in design and construction
The demand of parameter is also different.Therefore, the intensive parameter of abyssal floor superficial layer soil body is accurately obtained to ensureing deep-sea ocean structure
The security and stability of thing has particularly important meaning.
Due to the unique deposition characteristics in deep-sea, sea bed superficial layer soil body is mostly the stronger bury of particle homogeneous texture,
With low intensity, the characteristics of quiet pore pressure is big, high sensitivity, strong stream plasticity, existing conventional surveying method is extremely difficult at present obtains standard
True intensive parameter.
Traditional strength assessment method has penetration test, vane shear test and triaxial compression test.Penetration test should
With it is more be bevel-type static sounding and miniature penetrometer, between penetration resistance and shearing strength that bevel-type static sounding obtains
Relation is more to rely on engineering experience, because empirical parameter scope is larger, chooses the improper result of calculation that easily causes and deposits
In larger error；Miniature penetrometer is light simple but requires high to experimental implementation：Injection rate uniform is constant, it is impossible to had
Fast impact pauses；Reading is quick and precisely；Remain vertical injection soil body of miniature penetrometer etc..Triaxial compression test operation is multiple
It is miscellaneous, and the test period is longer.And vane shear test measured value tends to residual strength, it is impossible to reflect that the real peak value of the soil body is strong
Degree, and discreteness is larger, is easily influenceed by soil disturbance degree.
Utility model content
To be solved in the utility model is the technical problem for detecting bury shear stress, and provides a kind of spy
The bar shaped probe of bury shear stress is surveyed, by the way that the bar shaped is popped one's head in continuous injection soil, according to the soil body measured
Resistance determines the shear stress of bury.
In order to solve the above-mentioned technical problem, the utility model is achieved by following technical scheme：
A kind of bar shaped probe for detecting bury shear stress, including feeler lever, the feeler lever bottom are connected with length
Square bar shaped termination, the bar shaped termination are fixed with its rectangular cross-sectional center with the feeler lever, the feeler lever lower end
Load cell is installed close to the bar shaped termination.
Wherein, it is provided with screw thread at the top of the feeler lever.
Wherein, the width of the bar shaped termination is 2-8cm, length is at least 5 times of width, thickness 0.5-1cm.
Wherein, the load cell is resistance-type force snesor or Optical Fiber Force Sensor.
Wherein, the feeler lever and the bar shaped termination are made of stainless steel.
The beneficial effects of the utility model are：
(1) bar shaped probe detection bury shear stress of the present utility model, due to bar shaped probe failure mechanism
The influence of cladding earth pressure and pore water pressure can be eliminated, without additional correction；
(2) bar shaped probe detection bury shear stress of the present utility model, due to bar shaped probe projected area
It is bigger than bevel-type probe, more accurate shear stress value can be obtained；
(3) bar shaped probe detection bury shear stress of the present utility model, bar shaped pop one's head in penetration resistance with it is soft
Relation between clay shear stress has strict Theory Solution, so as to greatly reduce artificial sense datum to calculating
As a result influence.
Brief description of the drawings
Fig. 1 is the structural representation of bar shaped probe provided by the utility model；
Fig. 2 is the design drawing of bar shaped probe provided by the utility model；
Wherein (a) is front elevation view；(b) it is side elevational view；(c) it is top view；
Fig. 3 is the full flow motion ideograph of bar shaped probe；
Fig. 4 is the result pair for the soil body shear stress that bar shaped probe of the present utility model measures with four-bladed vane in situ
Than figure.
In above-mentioned figure：1st, bar shaped end；2nd, load cell；3rd, feeler lever；4th, screw thread.
Embodiment
For content, feature and effect of the present utility model can be further appreciated that, following examples are hereby enumerated, and coordinate accompanying drawing
Describe in detail as follows：
As depicted in figs. 1 and 2, a kind of bar shaped probe for detecting bury shear stress is present embodiments provided,
Mainly it is made up of bar shaped end 1, load cell 2 and feeler lever 3.
Bar shaped termination 1 is made up of a rectangle corrosion resistant plate, its long A (50cm), wide B (8cm), thick C (1cm).Generally come
Say, the width B of bar shaped termination 1 is more than 5 times of width in 2-8cm, length A, and thickness C is between 0.5-1cm.
Feeler lever 3 is also made of stainless steel, and feeler lever 3 is cylinder, diameter E (4cm), long D (200cm)；The diameter of feeler lever 3
It is equal or smaller typically with the width of bar shaped termination 1.The top of feeler lever 3 is provided with screw thread 4, can be with common static sounding feeler lever phase
Connection.The bottom of feeler lever 3 is fixed on the rectangular cross-sectional center of bar shaped termination 1.
The lower end of feeler lever 3 is provided with load cell 2 close to bar shaped termination 1, load cell 2 can be resistance-type force snesor or
Optical Fiber Force Sensor.
Method using the detection bury shear stress of above-mentioned bar shaped probe is as follows：
1st, each part of detection system is tested respectively, verifies its validity.
For the first time before use, needing to demarcate the force snesor of load cell 2, later every half a year re-starts mark
It is fixed.
3rd, the bevel-type probe of former static sounding system is removed, bar shaped probe provided by the utility model is installed.
4th, measurement is identical with injection method with the measurement of injection method and static sounding system, and here is omitted.
5th, the bar shaped probe penetration resistance data obtained according to test pass through formula (1) and (2) calculate bury not draining
Shear strength Su：
In formula：B is the width of bar shaped termination 1 in bar shaped probe,
P is bar shaped probe penetration resistance,
SuFor bury undrained shear strength,
Adhesive aggregation force coefficients of the α between the bar shaped probe and bury, wherein sin Δs=α=a/Su, a is the bar
The cohesive strength that shape is popped one's head between bury；
Bury shear stress S is calculated by formula (1) and (2)uHigher limit and lower limit, you can
Go out to bury shear stress SuScope.
Compared with traditional strength test method, the bar shaped of detection bury shear stress of the present utility model is visited
Head and computational methods, have the following advantages that：
(1) compared with traditional bevel-type static sounding probe, bury not draining is calculated by bar shaped probe penetration resistance P
Shearing strength SuWhen, the influence of cladding earth pressure and pore water pressure can be eliminated, without additional correction：
Bar shaped probe penetration process meets full flow damage pattern.The full flow pattern of the so-called soil body is exactly to meet Fig. 3
Shown soil body sports ground and stress field.Curve is the line of motion of the soil body in Fig. 3, and ray is the trajectory of principle stress of the soil body.The stream
Dynamic model formula thinks that in penetration process is popped one's head in bar shaped the soil body can flow completely along bar shaped probe lower loop around bar shaped probe section
To the top of bar shaped probe, and soil body sports ground is symmetrical up and down.
According to full flow damage pattern, the soil body motion displacement and stress fields be it is symmetrical up and down, therefore
Ignoring in bar shaped probe thickness range itself under conditions of the burden pressure of the soil body and pore pressure difference, it is believed that overlying soil pressure
Power does not influence with pore pressure on the penetration resistance that bar shaped is popped one's head in.But bar shaped termination 1 and the coupling part of feeler lever 3 do not connect with the soil body
Touch, for needing to carry out pore pressure amendment and unit weight Surcharge modification to the soil body resistance that full flowing cone penetration method measures herein.
The injection of full flowing probe and pull-out resistance correction formula are as follows：
qfull-flow=qt-[σv0-u0(1-α)]As/AP (3)
In formula, qfull-flowFor revised soil body resistance, qtFor the probe resistance measured；σv0At soil body depth of penetration
Soil body cladding earth pressure；u0For the pore pressure at depth of penetration；AsFor the cross-sectional area of feeler lever 3；APFor the vertical throwing of bar shaped termination 1
Shadow area.Due to As/APGenerally less than 1/10, this amendment is usually also ignored.
(2) because bar shaped pops one's head in projected area than bevel-type probe greatly, therefore more accurate bury can be obtained and do not arranged
Water shear strength：
Due to deep-sea Pore Pressure u2It is very big, between 10MPa~15MPa, and deep sea shallow top layer soil strength compared with
Low, effective static point resistance is between 10~100kPa.Effective static point resistance only has 1 ‰~1% of pore pressure or so, is almost visited with power
It is consistent to survey the error range of original paper, therefore is difficult to measure accurate effective static point resistance.And the plane projection of bar shaped probe
Area is 10 to 100 times of bevel-type probe, and corresponding effectively penetration resistance is also popped one's head in big 10 to 100 times or so than bevel-type, therefore
Under the same measuring conditions, the relative measurement error of the bar shaped probe penetration resistance measured is also popped one's head in small by 10 to 100 than bevel-type
Times.
(3) relation between bar shaped probe penetration resistance and bury shear stress has strict Theory Solution：
It is theoretical according to Plastic flow of soil, the soil body is reduced to rigid-plastic material, meets Tresca yield criterions, and do not consider soil
The influence of weight.Utilize Slip Line Theory, the slip-line field (as shown in Figure 3) of the construction bar shaped probe penetration process soil body, in this base
The stress field that the motor-driven sports ground allowed and static(al) allow is established on plinth, the bury resistance of bar shaped probe penetration process can be tried to achieve
Power bound solution.
Lower limit solution is：
Upper Bound Solution is：
In formula：B be bar shaped probe in bar shaped termination 1 width, P be bar shaped pop one's head in penetration resistance, SuDo not arranged for bury
Water shearing strength, adhesive aggregation force coefficients of the α between the bar shaped probe and bury, wherein sin Δs=α=a/Su, a is described
Cohesive strength between bar shaped probe and bury.
Cone penetration test and vane-shear have been carried out to somewhere soft clay foundation using the utility model bar shaped probe
Experiment, test method have calculated soil body undrained strength with depth as described above, depth of penetration is 3m according to test data
Change curve, test result are as shown in Figure 4.As shown in Figure 4, the test result of bar shaped probe measures bury with four-bladed vane in situ
Undrained shear strength is sufficiently close to, it was demonstrated that the validity and accuracy of bar shaped probe.
Although preferred embodiment of the present utility model is described above in conjunction with accompanying drawing, the present invention does not limit to
In above-mentioned embodiment, above-mentioned embodiment is only schematical, be not it is restricted, this area
Those of ordinary skill is not departing from invention objective and scope of the claimed protection situation under enlightenment of the present utility model
Under, the specific conversion of many forms can also be made, these are belonged within the scope of protection of the utility model.
Claims (5)
1. a kind of bar shaped probe for detecting bury shear stress, including feeler lever, it is characterised in that the feeler lever bottom
Rectangular bar shaped termination is connected with, the bar shaped termination is fixed with its rectangular cross-sectional center with the feeler lever, described
Feeler lever lower end is provided with load cell close to the bar shaped termination.
A kind of 2. bar shaped probe for detecting bury shear stress according to claim 1, it is characterised in that institute
State and be provided with screw thread at the top of feeler lever.
A kind of 3. bar shaped probe for detecting bury shear stress according to claim 1, it is characterised in that institute
At least 5 times, the thickness 0.5-1cm that the width for stating bar shaped termination is 2-8cm, length is width.
A kind of 4. bar shaped probe for detecting bury shear stress according to claim 1, it is characterised in that institute
It is resistance-type force snesor or Optical Fiber Force Sensor to state load cell.
A kind of 5. bar shaped probe for detecting bury shear stress according to claim 1, it is characterised in that institute
State feeler lever and the bar shaped termination is made of stainless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720937075.1U CN207176660U (en) | 2017-07-31 | 2017-07-31 | A kind of bar shaped probe for detecting bury shear stress |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720937075.1U CN207176660U (en) | 2017-07-31 | 2017-07-31 | A kind of bar shaped probe for detecting bury shear stress |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207176660U true CN207176660U (en) | 2018-04-03 |
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ID=61744753
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720937075.1U Expired - Fee Related CN207176660U (en) | 2017-07-31 | 2017-07-31 | A kind of bar shaped probe for detecting bury shear stress |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107326889A (en) * | 2017-07-31 | 2017-11-07 | 天津大学 | A kind of bar shaped probe and computational methods for detecting bury shear stress |
-
2017
- 2017-07-31 CN CN201720937075.1U patent/CN207176660U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107326889A (en) * | 2017-07-31 | 2017-11-07 | 天津大学 | A kind of bar shaped probe and computational methods for detecting bury shear stress |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180403 Termination date: 20200731 |