CN107326889A - A kind of bar shaped probe and computational methods for detecting bury shear stress - Google Patents
A kind of bar shaped probe and computational methods for detecting bury shear stress Download PDFInfo
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- CN107326889A CN107326889A CN201710636548.9A CN201710636548A CN107326889A CN 107326889 A CN107326889 A CN 107326889A CN 201710636548 A CN201710636548 A CN 201710636548A CN 107326889 A CN107326889 A CN 107326889A
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- bar shaped
- bury
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D1/00—Investigation of foundation soil in situ
- E02D1/02—Investigation of foundation soil in situ before construction work
- E02D1/022—Investigation of foundation soil in situ before construction work by investigating mechanical properties of the soil
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
Abstract
The invention belongs to ocean engineering soil investigation, soil exploration field, disclose a kind of bar shaped probe and computational methods 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, 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；Cone penetration test is carried out to bury using bar shaped probe, the bar shaped probe penetration resistance of bury is measured, the scope of bury shear stress is calculated by formula.The bar shaped probe failure mechanism of the present invention 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 in, has strict Theory Solution between penetration resistance and bury shear stress, so as to greatly reduce influence of the artificial sense datum to result of calculation.
Description
Technical field
It is to be related to one kind not arrange for detecting bury specifically the invention belongs to ocean engineering soil investigation, soil exploration field
The static sounding probe in situ of water shear strength and the computational methods of detection bury shear stress.
Background technology
China's current standard provides to be referred to as in " abysmal area " more than the region of 500 meters of depth of waters.Ocean engineering structure in deep-sea
It is very different in terms of structure type, force-bearing characteristics, basic property with shallow sea works, to the soil body in design and construction
The demand of parameter is also different.Therefore, the accurate intensive parameter for obtaining abyssal floor superficial layer soil body is 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 generally the stronger bury of particle homogeneous texture,
With low intensity, quiet pore pressure is big, sensitivity is high, flow the characteristics of plasticity is strong, and 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 is obtained
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.
The content of the invention
The present invention is to solve the technical problem of detection bury shear stress, and it is soft there is provided a kind of detection
The bar shaped probe and computational methods of clay shear stress, by the way that the bar shaped is popped one's head in continuous injection soil, according to measuring
Soil body resistance determine the shear stress of bury.
In order to solve the above-mentioned technical problem, the present invention is achieved by following technical scheme：
A kind of bar shaped probe for detecting bury shear stress, including feeler lever, the feeler lever bottom is connected with length
Square bar shaped termination, the bar shaped termination is fixed with its rectangular cross-sectional center and 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 be 2-8cm, length be at least 5 times of width, thickness be 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.
A kind of computational methods using above-mentioned bar shaped probe detection bury shear stress, are visited using the bar shaped
Head carries out cone penetration test to bury, measures the bar shaped probe penetration resistance of bury, is calculated by formula (1) and (2)
Bury shear stress Su：
In formula：B is the width of bar shaped termination described in the bar shaped is popped one's head in,
P is the penetration resistance that the bar shaped is popped one's head in,
SuFor bury undrained shear strength,
α is the adhesive aggregation force coefficient 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；
Calculated by formula (1) and (2) and obtain bury shear stress SuHigher limit and lower limit, you can
Go out to bury shear stress SuScope.
The beneficial effects of the invention are as follows：
(1) bar shaped probe of the invention and computational methods detection bury shear stress, because bar shaped probe is broken
Bad mechanism can eliminate the influence of cladding earth pressure and pore water pressure, without additional correction；
(2) bar shaped probe of the invention and computational methods detection bury shear stress, are popped one's head in due to bar shaped and thrown
Shadow area is bigger than bevel-type probe, can obtain more accurate shear stress value；
(3) bar shaped probe of the invention and computational methods detection bury shear stress, bar shaped probe injection resistance
Relation between power and bury shear stress has strict Theory Solution, so as to greatly reduce artificial sense datum
Influence to result of calculation.
Brief description of the drawings
Fig. 1 is the structural representation of bar shaped probe provided by the present invention；
Fig. 2 is the design drawing of bar shaped probe provided by the present invention；
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 Comparative result for the soil body shear stress that bar shaped probe of the invention is measured with four-bladed vane in situ
Figure.
In above-mentioned figure：1st, bar shaped end；2nd, load cell；3rd, feeler lever；4th, screw thread.
Embodiment
For present disclosure, feature and effect can be further appreciated that, following examples are hereby enumerated, and coordinate accompanying drawing detailed
It is described 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 in 2-8cm, and length A is more than 5 times of width, 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 for resistance-type force snesor or
Optical Fiber Force Sensor.
The method for the detection bury shear stress popped one's head in using above-mentioned bar shaped 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, the bar shaped probe that the present invention is provided is installed.
4th, measure identical with injection method with the measurement of injection method and static sounding system, 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 during bar shaped is popped one's head in,
P is bar shaped probe penetration resistance,
SuFor bury undrained shear strength,
α is the adhesive aggregation force coefficient 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；
Calculated by formula (1) and (2) and obtain bury shear stress SuHigher limit and lower limit, you can
Go out to bury shear stress SuScope.
Compared with traditional strength test method, the bar shaped probe of detection bury shear stress of the invention 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 bar shaped probe penetration process the soil body can flow completely along bar shaped probe lower loop around bar shaped probe section
The top popped one's head in bar shaped, 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 is measured 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 projected area of popping one's head in is bigger than bevel-type probe, therefore more accurate bury can be obtained do not arrange
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
The error range for surveying original paper is consistent, therefore is difficult to measure accurately effectively static point resistance.And the plane projection of bar shaped probe
Area is 10 to 100 times that bevel-type is popped one's head in, 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, Tresca yield criterions are met, and does 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 is the width of bar shaped termination 1 during bar shaped is popped one's head in, and P is bar shaped probe penetration resistance, SuDo not arranged for bury
Water shearing strength, α is the adhesive aggregation force coefficient 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 test have been carried out to somewhere soft clay foundation using bar shaped of the present invention probe,
Test method as described above, depth of penetration be 3m, change of the soil body undrained strength with depth has been calculated according to test data
Curve, test result is 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 and not arranged
Water shearing strength is sufficiently close to, it was demonstrated that the validity and accuracy of bar shaped probe.
Although the preferred embodiments of the present invention are described above in conjunction with accompanying drawing, the invention is not limited in upper
The embodiment stated, above-mentioned embodiment is only schematical, be not it is restricted, this area it is common
Technical staff is under the enlightenment of the present invention, in the case of invention objective and scope of the claimed protection is not departed from, can be with
The specific conversion of many forms is made, these are belonged within protection scope of the present invention.
Claims (6)
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 and the feeler lever, described
Feeler lever lower end is provided with load cell close to the bar shaped termination.
2. a kind of 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.
3. a kind of bar shaped probe for detecting bury shear stress according to claim 1, it is characterised in that institute
The width for stating bar shaped termination be 2-8cm, length be at least 5 times of width, thickness be 0.5-1cm.
4. a kind of bar shaped probe for detecting bury shear stress according to claim 1, it is characterised in that institute
Load cell is stated for resistance-type force snesor or Optical Fiber Force Sensor.
5. a kind of 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.
6. the calculating side of bar shaped probe detection bury shear stress any one of a kind of utilization claim 1-5
Method, it is characterised in that application bar shaped probe carries out cone penetration test to bury, the bar shaped probe for measuring bury is passed through
Enter resistance, bury shear stress S is calculated by formula (1) and (2)u：
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In formula：B is the width of bar shaped termination described in the bar shaped is popped one's head in,
P is the penetration resistance that the bar shaped is popped one's head in,
SuFor bury undrained shear strength,
α is the adhesive aggregation force coefficient between the bar shaped probe and bury, wherein sin Δs=α=a/Su, a is bar shaped probe
Cohesive strength between bury；
Calculated by formula (1) and (2) and obtain bury shear stress SuHigher limit and lower limit, you can draw
Bury shear stress SuScope.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710636548.9A CN107326889B (en) | 2017-07-31 | 2017-07-31 | Bar-shaped probe for detecting non-drainage shear strength of soft clay and calculation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710636548.9A CN107326889B (en) | 2017-07-31 | 2017-07-31 | Bar-shaped probe for detecting non-drainage shear strength of soft clay and calculation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107326889A true CN107326889A (en) | 2017-11-07 |
| CN107326889B CN107326889B (en) | 2022-08-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710636548.9A Active CN107326889B (en) | 2017-07-31 | 2017-07-31 | Bar-shaped probe for detecting non-drainage shear strength of soft clay and calculation method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107505218A (en) * | 2017-08-03 | 2017-12-22 | 立方通达实业（天津）有限公司 | A kind of effect equipment of indoor vane shear test instrument |
| CN107747306A (en) * | 2017-11-07 | 2018-03-02 | 东南大学 | A kind of cross with Yu Haiyang ultra-soft soil in-situ test flows feeler inspection probe entirely |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204461908U (en) * | 2015-04-09 | 2015-07-08 | 中国电力工程顾问集团华北电力设计院有限公司 | A kind of soft clay undrained shear strength proving installation |
| CN105568950A (en) * | 2015-12-30 | 2016-05-11 | 东南大学 | Miniature free fall disc type dynamic sounding device for testing undrained shear strength |
| CN206736884U (en) * | 2017-04-28 | 2017-12-12 | 中国电力工程顾问集团华北电力设计院有限公司 | T-shaped feeler inspection square-section probe |
| CN207176660U (en) * | 2017-07-31 | 2018-04-03 | 天津大学 | A kind of bar shaped probe for detecting bury shear stress |
-
2017
- 2017-07-31 CN CN201710636548.9A patent/CN107326889B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204461908U (en) * | 2015-04-09 | 2015-07-08 | 中国电力工程顾问集团华北电力设计院有限公司 | A kind of soft clay undrained shear strength proving installation |
| CN105568950A (en) * | 2015-12-30 | 2016-05-11 | 东南大学 | Miniature free fall disc type dynamic sounding device for testing undrained shear strength |
| CN206736884U (en) * | 2017-04-28 | 2017-12-12 | 中国电力工程顾问集团华北电力设计院有限公司 | T-shaped feeler inspection square-section probe |
| CN207176660U (en) * | 2017-07-31 | 2018-04-03 | 天津大学 | A kind of bar shaped probe for detecting bury shear stress |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107505218A (en) * | 2017-08-03 | 2017-12-22 | 立方通达实业（天津）有限公司 | A kind of effect equipment of indoor vane shear test instrument |
| CN107747306A (en) * | 2017-11-07 | 2018-03-02 | 东南大学 | A kind of cross with Yu Haiyang ultra-soft soil in-situ test flows feeler inspection probe entirely |
| CN107747306B (en) * | 2017-11-07 | 2019-09-10 | 东南大学 | A kind of cross with Yu Haiyang's ultra-soft soil in-situ test flows feeler inspection probe entirely |
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