CN108797654A - T-type feeler inspection diamond-shaped cross-section is popped one's head in - Google Patents
T-type feeler inspection diamond-shaped cross-section is popped one's head in Download PDFInfo
- Publication number
- CN108797654A CN108797654A CN201710294609.8A CN201710294609A CN108797654A CN 108797654 A CN108797654 A CN 108797654A CN 201710294609 A CN201710294609 A CN 201710294609A CN 108797654 A CN108797654 A CN 108797654A
- Authority
- CN
- China
- Prior art keywords
- probe
- diamond
- cross bar
- section
- shaped cross
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000007689 inspection Methods 0.000 title claims abstract description 19
- 239000000523 sample Substances 0.000 claims abstract description 75
- 238000002627 tracheal intubation Methods 0.000 claims abstract description 21
- 229910003460 diamond Inorganic materials 0.000 claims abstract description 10
- 239000010432 diamond Substances 0.000 claims abstract description 10
- 238000003860 storage Methods 0.000 claims description 9
- 238000012360 testing method Methods 0.000 abstract description 22
- 238000000034 method Methods 0.000 abstract description 14
- 239000004927 clay Substances 0.000 abstract description 12
- 230000003746 surface roughness Effects 0.000 abstract description 6
- 238000011065 in-situ storage Methods 0.000 abstract description 4
- 230000004323 axial length Effects 0.000 description 17
- 230000003068 static effect Effects 0.000 description 9
- 239000002689 soil Substances 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000010008 shearing Methods 0.000 description 3
- 230000009897 systematic effect Effects 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000009533 lab test Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005290 field theory Methods 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- A Measuring Device Byusing Mechanical Method (AREA)
Abstract
A kind of T-type feeler inspection diamond-shaped cross-section probe of the present invention, diamond-shaped cross-section probe are cross bar, and cross bar is connected with Double lumen intubation probe, and the side view of the cross bar is diamond shape.Cross bar is with Double lumen intubation probe using cone slot type connection structure or screw thread type connection structure.In side view, diamond shape long axis length is 2a, short axle 2b, 0<b/a<0.8.The probe of traditional T-type feeler inspection is changed to diamond-shaped cross-section by the present invention, detecting head surface roughness difference and the uncertain test error brought can substantially be reduced, there is the promotion of matter to Soft Clay Foundation undrained shear strength method in situ of seeking, greatly pushes application of this method in engineering practice.
Description
Technical field
The present invention relates to T-type feeler inspection sonde configurations.
Background technology
T-type feeler inspection is also full stream feeler inspection, is a kind of method for the undrained shear strength for testing soft clay.Soft clay is not
Draining shearing strength is to determine the important indicator of foundation bearing capacity, bearing capacity of pile foundation and Critical Height of Embankment, is soft clay foundation
Parameter necessary to Foundation Pit Support Design.
The test method of the index mainly has two class of laboratory experiment method and in-situ test method.During laboratory test sample by
Power condition is clear, but in sampling and sample making course, is disturbed greatly to sample, and test result dispersion is big, representative poor.In-situ test
In method, field vane shear test is current most common method, but the drainage condition of the soil body cannot control in test process, test effect
Rate is low, can only obtain the undrained shear strength along each discrete point of depth, and measuring point spacing is generally 1m.In home position testing method,
Cone penetration test rule of thumb relationship, acquires soft clay undrained shear strength indirectly.It include upper earthing in this empirical relation
The contents such as the relevant empirical coefficient of pressure correction and soil nature and area.The value of these empirical coefficients will all influence test result
Accuracy.
In-situ test tradition T-type feeler inspection probe is cylinder, and test result interpretation has stringent theoretical foundation, testing efficiency
Height can obtain the continuous undrained shear strength value along depth, but test result is affected by detecting head surface roughness, right
Ying Yu is completely smooth and complete coarse two kinds of limiting conditions, and test result difference and average ratio are up to 26%.In Practical Project, added
The influence of work and scene abrasion limits the application of the test method to a certain extent it is difficult to control the roughness of probe.Cause
A kind of Novel T-shaped feeler inspection probe for reducing probe roughness and influencing is needed in this engineering practice.
The cone penetrometer popped one's head in using other shapes is always that engineering and academia make great efforts research to reduce systematic error
Direction.Probe is the core component of cone penetrometer, and the corresponding different data interpretation mode of probe of different shapes forms different touch
Visit instrument.The interpretation theoretical foundation of cylindrical T-type feeler inspection is that the Randolph and Oxonian Houlsby of Cambridge University are proposed
Analytic expression [1].Acquiring for the analytic expression is related to complicated theory analysis.
[1]M.F.RANDOLPH,G.T.HOULSBY The limiting pressure on a circular pile
loaded laterally in cohesive soil[J].Géotechnique,1984,34(4):613–623.
Invention content
The shortcomings that technical problem solved by the invention is, pops one's head in for existing circular cross-section T-type feeler inspection proposes a kind of
Novel probe, to improve measuring accuracy and reliability.
To achieve the above object, the present invention adopts the following technical scheme that：A kind of T-type feeler inspection diamond-shaped cross-section probe, the diamond shape
Section probe is cross bar, and cross bar is connected with Double lumen intubation probe, and the side view of the cross bar is diamond shape.
For cross bar with Double lumen intubation probe using cone slot type connection structure, cross bar middle part is provided with the circle that apex angle is 60 °
Taper storage tank, Double lumen intubation probe is with montant and the top cap being connected with montant bottom, top cap and the storage tank phase
Suit.
Cross bar uses screw thread type connection structure with Double lumen intubation probe, is provided with screw thread in the middle part of cross bar, screw thread passes through
Connector is connected with cross bar, and Double lumen intubation probe only has montant, montant bottom and screw thread bolt.
In side view, long axis length 2a, short axle 2b, 0<b/a<0.8.
Beneficial effects of the present invention are as follows.The present invention has acquired the accurate solution of diamond-shaped cross-section probe resistance, analyzes system
Error with diamond shape axial length than variation, have found optimal axial length than section, obtained the meter needed for diamond-shaped cross-section probe work
Calculate parameter.The probe of traditional T-type feeler inspection is changed to diamond-shaped cross-section by the present invention, can substantially reduce detecting head surface roughness difference and not
The test error that certainty is brought, seeking Soft Clay Foundation undrained shear strength method to original position has the promotion of matter, greatly
Push application of this method in engineering practice.
Description of the drawings
Fig. 1 is work structure diagram of the present invention.
Fig. 2 a are cross bar front view of the embodiment of the present invention.
Fig. 2 b are the side view of Fig. 2 a.
Fig. 2 c are the vertical view of Fig. 2 a.
Fig. 3 a are another embodiment of the present invention cross bar front view.
Fig. 3 b are the side view of Fig. 3 a.
Fig. 3 c are the vertical view of Fig. 3 a.
Fig. 4 is cross bar of the embodiment of the present invention and Double lumen intubation probe attachment structure schematic diagram.
Fig. 5 is another embodiment of the present invention cross bar and Double lumen intubation probe attachment structure schematic diagram.
Fig. 6 is drag-coefficient curve.
Fig. 7 is the ratio between resistance coefficient difference and average value curve.
Fig. 8 be resistance coefficient average value with axial length than variation.
Specific implementation mode
As shown in Figure 1, a kind of present invention T-type feeler inspection diamond-shaped cross-section probe, diamond-shaped cross-section probe is cross bar 1, cross bar 1 with
Double lumen intubation probe 2 is connected, and 2 top of Double lumen intubation probe connects hollow feeler lever 21, the setting of hollow feeler lever inside
There is probe sensor transmission line 22, is connected with display device 23 by probe sensor transmission line 22, display device 23 is used for
Display probe reading.It focuses on, and as shown in Fig. 2 a-c and Fig. 3 a-c, the side view of the cross bar 1 is diamond shape.
In Fig. 2 a-c and Fig. 4, cross bar 1 is with Double lumen intubation probe 2 using cone slot type connection structure, 1 middle part of cross bar
It is provided with the conical storage tank 3 that apex angle A is 60 °, Double lumen intubation probe 2 has montant 4 and is connected with 4 bottom of montant
Top cap 5, top cap cone angle and storage tank apex angle match and 60 °, and top cap 5 just mutually suits closely with the storage tank 3.This
Behind kind structure diamond-shaped cross-section probe indentation underground, it is left in underground, cannot be brought up, is disposable.
In Fig. 3 a-c and Fig. 5, cross bar 1 uses screw thread type connection structure, 1 middle part of cross bar with Double lumen intubation probe 2
It is provided with screw thread 6, screw thread 6 is connected by connector 7 with cross bar 1, the only montant 4 of Double lumen intubation probe 2,4 bottom of montant
With 6 bolt of screw thread.Such structure can be recycled.
The present invention has acquired the accurate solution of diamond-shaped cross-section probe resistance by a large amount of research work, analyzes system mistake
Difference with diamond shape axial length than variation, have found optimal axial length than section, obtained the calculating needed for diamond-shaped cross-section probe work
Parameter.
The probe of traditional T-type feeler inspection is changed to diamond-shaped cross-section by the present invention, can substantially reduce detecting head surface roughness difference and
The test error that uncertainty is brought.Processing and fabricating of popping one's head in is convenient, can greatly push application of this method in engineering practice.
Present invention probe is the cross bar that section is diamond shape.Cross bar can pass through two ways with general static penetrometer host
Connection.
(1) slot type is bored.The conical storage tank that one apex angle of setting is 60 ° in the middle part of diamond-shaped cross-section cross bar side.It is double when test
Vertically probe mutually suits bridge static contact-detection machine with this probe storage tank.
(2) screw thread type.The thread that setting is connected with static contact-detection machine probe end in the middle part of diamond-shaped cross-section cross bar side.
Double lumen intubation probe top cap is taken, this thread is connected with static sounding probe end.
When test, this probe is flatly pressed into underground using static contact-detection machine.In process of press in, bored by static sounding
Sharp resistance obtains pushing the power needed for diamond-shaped cross-section probe, is denoted as probe resistance P.It is general primary per downlink 10cm records.
For soft clay, undrained strength characteristic obeys Tresca yield conditions.Probe resistance P is not drained with soft clay
Shearing strength Su), probe length L, probe half axial length of section diamond shape (a and b) and surface roughness α it is related.It is moulded according to soil
Property mechanics slip line field theory, ask diamond-shaped cross-section to pop one's head in resistance P, there are two types of method, one is answered by construct that static(al) allows
Resistance lower limit solution P is acquired in the field of force-, one is by constructing the motor-driven velocity of displacement field allowed, acquire Upper Bound Solution P+.If the upper limit
Solve P+With lower limit solution P-Identical, then gained solution is accurate solution P.
According to this result of study, for complete coarse (α=1) and it is completely smooth (α=0) two kinds of limiting conditions, resistance system
Number (Dimensionless) with diamond-shaped cross-section axial length ratio ξ (ξ=b/a) relationship be shown in Table 1.
The probe resistance coefficient of table 1 N
Will be completely coarse and be completely smooth under two kinds of working conditions, resistance coefficient (NCAnd NS) with axial length than variation see figure
6.As can be seen from Figure 6, with the reduction of axial length ratio ξ, the difference of two kinds of operating mode resistance coefficients is gradually reduced.
It is completely smooth and complete coarse two kinds of operating mode resistance coefficient differences and resistance coefficient average value The ratio between with axial length than variation see Fig. 7.
As can be seen from Figure 7, diamond-shaped cross-section pop one's head in the ratio between resistance coefficient difference and average value, with axial length than increase, it is more next
Bigger, systematic error increases.When axial length ratio b/a is less than 0.8, diamond-shaped cross-section pops one's head in measuring accuracy better than the spy of typical round section
Head.Therefore, long axis length 2a, short axle 2b, 0<b/a<0.8.
As axial length ratio ξ=0, i.e., probe for one it is horizontal positioned without thickness piece when, difference 0, test result and probe
The roughness on surface is unrelated, and systematic error is minimum.But limited by the strength of materials, it is impossible to use the probe of ξ=0, but select
One is selected suitable for ξ values (0<ξ<0.8), probe is made to be tested.
Pop one's head in resistance P and probe length L, half axial length of diamond-shaped cross-section (a and b), Soft Clay Foundation undrained shear strength Su,
There is relational expression (1) as follows：
The undrained shear strength of soft clay is directly acquired using above formula.
Fig. 1 is probe operating diagram.Applied using static contact-detection machine in work and push load F, diamond-shaped cross-section is popped one's head in
Flatly it is pressed into underground.During pushing, by popping one's head in, pressure sensor surveys read tap cone resistance value.The value is visited for diamond-shaped cross-section
Numerical value after ground soil resistance divided by static sounding probe top cap cross-sectional area suffered by head, unit MPa.Therefore probe is read
It is multiplied by the cross-sectional area and is pushing suffered resistance P in the process to get diamond-shaped cross-section probe.
When practical application, probe resistance P and probe length L, half axial length a and b of diamond-shaped cross-section probe, Soft Clay Foundation are not arranged
Water shearing strength Su, can be expressed by following relational expression (2).
In formula,It is related with axial length ratio b/a, detecting head surface roughness for resistance coefficient, it can be according to probe in practical application
Axial length ratio b/a takes the average value being completely smooth under complete coarse operating mode(Fig. 8 or table 2), is calculated.
2 resistance coefficient average value of table
Soft clay undrained shear strength S can be obtained according to relational expression (2)uRelational expression (3)：
In test process, a reading is generally surveyed per 10cm along depth, test speed 1.2m/min is calculated by relational expression (3)
Obtain undrained shear strength Su, draw along depth change curve.
Claims (4)
1. a kind of T-type feeler inspection diamond-shaped cross-section probe, diamond-shaped cross-section probe is cross bar, and cross bar is connected with Double lumen intubation probe
It connects, which is characterized in that the side view of the cross bar is diamond shape.
2. T-type feeler inspection diamond-shaped cross-section probe as described in claim 1, which is characterized in that cross bar is popped one's head in Double lumen intubation
Using cone slot type connection structure, the conical storage tank that apex angle is 60 ° is provided in the middle part of cross bar, Double lumen intubation probe has
Montant and the top cap being connected with montant bottom, top cap mutually suit with the storage tank.
3. T-type feeler inspection diamond-shaped cross-section probe as described in claim 1, which is characterized in that cross bar is popped one's head in Double lumen intubation
Using screw thread type connection structure, it is provided with screw thread in the middle part of cross bar, screw thread is connected by connector with cross bar, and Double lumen intubation is visited
Head only has montant, montant bottom and screw thread bolt.
4. T-type feeler inspection diamond-shaped cross-section probe as described in claim 1, which is characterized in that in side view, long axis length 2a,
Short axle is 2b, 0<b/a<0.8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710294609.8A CN108797654A (en) | 2017-04-28 | 2017-04-28 | T-type feeler inspection diamond-shaped cross-section is popped one's head in |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710294609.8A CN108797654A (en) | 2017-04-28 | 2017-04-28 | T-type feeler inspection diamond-shaped cross-section is popped one's head in |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108797654A true CN108797654A (en) | 2018-11-13 |
Family
ID=64070554
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710294609.8A Pending CN108797654A (en) | 2017-04-28 | 2017-04-28 | T-type feeler inspection diamond-shaped cross-section is popped one's head in |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108797654A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010072133A1 (en) * | 2008-12-23 | 2010-07-01 | 沈阳市建科仪器研究所 | On-site detector for foundation bearing capacity and filling compactness |
| CN205062789U (en) * | 2015-10-14 | 2016-03-02 | 中国电力工程顾问集团华北电力设计院有限公司 | Portable T type sounding appearance |
| CN205742134U (en) * | 2016-07-11 | 2016-11-30 | 中国电力工程顾问集团华北电力设计院有限公司 | Pocket T-shaped cone penetrometer |
| CN106546480A (en) * | 2015-09-22 | 2017-03-29 | 中国电力工程顾问集团华北电力设计院有限公司 | The test device of soft clay undrained shear strength |
| CN206736981U (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 diamond-shaped cross-section probe |
-
2017
- 2017-04-28 CN CN201710294609.8A patent/CN108797654A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010072133A1 (en) * | 2008-12-23 | 2010-07-01 | 沈阳市建科仪器研究所 | On-site detector for foundation bearing capacity and filling compactness |
| CN106546480A (en) * | 2015-09-22 | 2017-03-29 | 中国电力工程顾问集团华北电力设计院有限公司 | The test device of soft clay undrained shear strength |
| CN205062789U (en) * | 2015-10-14 | 2016-03-02 | 中国电力工程顾问集团华北电力设计院有限公司 | Portable T type sounding appearance |
| CN205742134U (en) * | 2016-07-11 | 2016-11-30 | 中国电力工程顾问集团华北电力设计院有限公司 | Pocket T-shaped cone penetrometer |
| CN206736981U (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 diamond-shaped cross-section probe |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103174122B (en) | Lateral stress pore pressure probe used for testing soil static lateral pressure coefficient | |
| CN105424910B (en) | Device for measuring layered settlement of soil mass | |
| CN206430670U (en) | A kind of river bottom mud measurer for thickness | |
| CN105735373A (en) | Measurement method of ultimate bearing capacity of prefabricated single pile | |
| CN201901866U (en) | T-shaped contact detector applied to deep-sea seabed feature testing | |
| CN204461908U (en) | A kind of soft clay undrained shear strength proving installation | |
| CN201780138U (en) | Multi-section capacitance level meter | |
| CN206736981U (en) | T-shaped feeler inspection diamond-shaped cross-section probe | |
| CN202865815U (en) | Novel static sounding feeler lever | |
| CN206736884U (en) | T-shaped feeler inspection square-section probe | |
| CN105133563B (en) | A kind of home position testing method and device of quick measure deep soil shearing strength | |
| CN106855402A (en) | Pressure-sensitive riverbed sludge thickness measurement equipment | |
| CN201074319Y (en) | Static sounding two-bridge probe | |
| CN110144869A (en) | A kind of more sidewall friction cylinder CPTU devices and its measurement method with rectangular pyramid protrusion | |
| CN207051146U (en) | A kind of slump detection means | |
| CN213897069U (en) | Foundation settlement detector | |
| CN205062789U (en) | Portable T type sounding appearance | |
| CN108797654A (en) | T-type feeler inspection diamond-shaped cross-section is popped one's head in | |
| CN109086502A (en) | A kind of Mechanics Parameters of Rock Mass fast determination method based on rotary-cut penetration technology | |
| CN106546480A (en) | The test device of soft clay undrained shear strength | |
| CN103243744B (en) | Detecting device for sediment thickness of ground foundation engineering construction | |
| CN207540916U (en) | A kind of device for drawing the novel curve of rock core relative hardness | |
| CN209606367U (en) | Accumulated snow parameter measurement instrument | |
| CN201373731Y (en) | Gradient-cutting automatic measuring instrument at end of steel pipe | |
| CN209624458U (en) | A kind of accumulated snow parameter measurement instrument |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20181113 |