CN106192969B - One kind is based on the full discharge orifice pressure feeler inspection penetrometer of ball-type and its coefficient of consolidation evaluation method - Google Patents
One kind is based on the full discharge orifice pressure feeler inspection penetrometer of ball-type and its coefficient of consolidation evaluation method Download PDFInfo
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- CN106192969B CN106192969B CN201610546164.3A CN201610546164A CN106192969B CN 106192969 B CN106192969 B CN 106192969B CN 201610546164 A CN201610546164 A CN 201610546164A CN 106192969 B CN106192969 B CN 106192969B
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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
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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
- E02D1/027—Investigation of foundation soil in situ before construction work by investigating properties relating to fluids in the soil, e.g. pore-water pressure, permeability
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Soil Sciences (AREA)
- Analytical Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention discloses one kind based on the full discharge orifice pressure feeler inspection penetrometer of ball-type and its coefficient of consolidation evaluation method, the penetrometer top is piezocone penetration probe (5), the conversion head (6) that is linked in sequence in the bottom of piezocone penetration probe (5), full stream feeler inspection feeler lever (4), full stream feeler inspection ball-type probe (1)；Circumference in stream feeler inspection ball-type probe (1) entirely transversely is provided with multiple sensor for pore water pressure (2), has pore pressure filter ring (3) outside the sensor for pore water pressure (2)；A sensor for pore water pressure (2) is provided with the junction of piezocone penetration probe (5) bottom and conversion head (6), has pore pressure filter ring (3) outside the sensor for pore water pressure (2).By in the at the uniform velocity continuous injection soil of the present apparatus, penetration resistance and pore water pressure dissipation data can be obtained, for evaluation soft soil consolidation coefficient have the characteristics that it is in situ, direct, quick, accurate, economical, for Geotechnical Engineering basement process put into practice strong testing tool is provided.
Description
Technical field
The present invention relates to a kind of coefficient of consolidation evaluation method based on the full discharge orifice pressure feeler inspection penetrometer of ball-type, belong to ground work
A kind of home position testing method that can directly, continuously analyze test plants root system compacted soil in journey field.
Background technology
The coefficient of consolidation is a very important index native in ground design, and the coefficient of consolidation is typically indoors by right
What the test of undisturbed soil was tried to achieve.But in environments such as subsea, sampling and transportation in it cannot be guaranteed that sample integrality and
Undisturbed, therefore obtained in preferably testing in the original location.The measuring and calculating most common method of in-situ consolidation coefficient is that pore pressure is quiet at present
Power feeler inspection, 50% is dissipated to calculate the coefficient of consolidation of soil by injection position pore water pressure.But the consumption of this method
When be very long, in general, if it is even longer to be dissipated to 50% needs several hours.Ocean geotechnical engineering investigation
In, required daily costly up to more than 500,000 yuan, this method of testing is clearly uneconomic.
The advantages of full stream feeler inspection compares static sounding is：(1) stream feeler inspection probe projected area is static sounding probe entirely
Ten times, more accurate penetration resistance can be obtained in dead-soft soil；(2) soil can be obtained not by the circulation injection of probe
Drained strength and sensitivity.Static sounding is extremely complex, and penetration resistance is by the rigidity of soil, strain and the shadow for straining anisotropic
Ring, and also have larger relation with strain rate and sensitivity, and the anisotropy and rigidity of soil are for the full influence for flowing feeler inspection
It is smaller.
Pore water pressure sensor can be installed on full stream feeler inspection ball-type probe, by flowing feeler inspection ball-type probe not to complete
Test result and the test of hole pressure touching methods bottom pore water pressure sensor with position placement pore water pressure sensor
As a result analysis is compared, the coefficient of consolidation of soil can be calculated.Flow the soft soil consolidation system of feeler inspection penetrometer entirely by using ball-type
Number in-situ evaluation method, hole pressure touching methods can be made to make pore water pressure dissipation speed significantly with flowing feeler inspection entirely while carrying out
Degree improves.
The content of the invention
Technical problem：The purpose of the present invention is in view of the deficienciess of the prior art, providing one kind is based on the full discharge orifice of ball-type
Press the coefficient of consolidation evaluation method of feeler inspection penetrometer.
Technical scheme：For achieving the above object, it is of the invention to be based on the full discharge orifice pressure feeler inspection penetrometer top of ball-type
Piezocone penetration probe, conversion head is connected in the bottom of piezocone penetration probe, the full stream of connection touches in the bottom of conversion head
Feeler lever is visited, in the full stream feeler inspection ball-type probe of the bottom connection of stream feeler inspection feeler lever entirely；In stream feeler inspection ball-type probe entirely transversely
Circumference is provided with multiple sensor for pore water pressure, has pore pressure filter ring outside the sensor for pore water pressure；In piezocone penetration probe bottom with turning
The junction for changing head is provided with a sensor for pore water pressure, has pore pressure filter ring outside the sensor for pore water pressure.
On described full stream feeler inspection ball-type probe, sensor for pore water pressure has nine altogether, wherein stream feeler inspection ball-type probe bottom entirely
One, portion, largest circumference transversely are provided with four, the middle part surface four between largest circumference transversely and bottom.
On described full stream feeler inspection ball-type probe, four sensor for pore water pressure of largest circumference transversely are externally provided with one
Pore pressure filter ring, four sensor for pore water pressure of the middle part surface between largest circumference transversely and bottom are externally provided with a hole
Press filtration ring, sensor for pore water pressure is wrapped up.
Full stream feeler inspection ball-type probe diameter be 60mm, the full stream a diameter of 20mm of feeler inspection feeler lever, and length is 200~300mm, hole
Press static sounding feeler lever diameter 35.7mm.
The coefficient of consolidation evaluation method based on the full discharge orifice pressure feeler inspection penetrometer of ball-type of the present invention is specific as follows：
1) needs by pore pressure filter ring in the container of glycerine is filled, and 100kPa~120kPa's before the test
Under vacuum pressure more than saturation 24h；
2) full stream feeler inspection ball-type probe and pore pressure static(al) are arranged on after pore pressures filter ring is fully saturated in the container of glycerine
Feeler inspection feeler lever bottom, by full stream feeler inspection ball-type probe continuous injection under 15mm/s~25mm/s speed, reach needs assessment
The coefficient of consolidation position of depth soil stops injection, flows the sensor for pore water pressure monitoring pore water pressure on feeler inspection penetrometer entirely by ball-type
Power dissipation data；
3) is after more than the 50%~80% of pore water pressure dissipation to excess pore water pressure, then under can continuing
The test of one point.
4) passes the pore pressure popped one's head in by the sensor for pore water pressure of piezocone penetration probe bottom, full stream feeler inspection ball-type
The dissipation of excess pore-water pressure data formula that sensor measures calculates the unearthed coefficient of consolidation, evaluates the engineering properties of the soil body；
The described coefficient of consolidation, calculation formula are as follows：
In formula：
t50Time during-pore water pressure dissipation 50%；
R- circular cone radiuses；
Ir- rigidity index；
T50- nondimensional time factor.
The coefficient of consolidation calculation formula of full stream feeler inspection soil：
In formula：
Db- feeler inspection ball-type probe diameter is flowed entirely；
D- flows feeler inspection feeler lever diameter entirely；
Ir- rigidity index；
tmax- pore water pressure reaches the time of maximum；
t50Time during-pore water pressure dissipation 50%.
Beneficial effect：Compared with traditional hole pressure touching methods, the present invention solve the pore pressure dissipation time it is long the defects of, pass through
Present device continuously, is at the uniform velocity inserted in soil, obtains penetration resistance and pore water pressure dissipation parameter, then pass through calculation formula
Obtain the coefficient of consolidation of soil.The present invention has the characteristics of rapidity, continuity, reliability and repeatability.
Brief description of the drawings
Fig. 1 is the structure that the present invention flows feeler inspection penetrometer for evaluating the ball-type of soft soil consolidation coefficient in-situ evaluation method entirely
Schematic diagram.
Fig. 2 is Fig. 1 bottom view.
Wherein have：Full stream feeler inspection ball-type probe 1, sensor for pore water pressure 2, pore pressure filter ring 3, complete to flow feeler inspection feeler lever 4, pore pressure is quiet
Power feeler inspection feeler lever 5, conversion head 6.
Embodiment
Below in conjunction with the accompanying drawings and instantiation, the present invention is furture elucidated, it should be understood that these examples are merely to illustrate this hair
Bright rather than limitation the scope of the present invention, after the present invention has been read, those skilled in the art are to of the invention various etc.
The modification of valency form falls within the application appended claims limited range.
Refer to shown in Fig. 1, the present invention discloses a kind of soft soil consolidation coefficient for being used to flow feeler inspection penetrometer entirely based on ball-type
In-situ evaluation method, the full feeler inspection ball-type probe 1 that flows have nine 2 sensor for pore water pressure, are symmetric.Sensor for pore water pressure surface respectively has
Pore pressure filter ring is wrapped up, and can prevent soil particle from entering sensor for pore water pressure and influenceing result of the test in penetration process.Full stream feeler inspection ball
Type probe diameter is that 60mm is connected with 200~300mm full stream feeler inspection feeler lever, complete to flow a diameter of 20mm of feeler inspection feeler lever, and full stream touches
Visit feeler lever to be connected by converter with static sounding feeler lever, sensor for pore water pressure and pore pressure filter ring are arranged at static sounding feeler lever bottom.
Illustrate that the present invention is consolidated for being flowed the weak soil of feeler inspection penetrometer entirely based on ball-type below by specific test example
Clone number in-situ evaluation method：
It is before experiment that pore pressure filter ring is fully saturated rear installed in full stream feeler inspection ball-type probe, feeler inspection ball-type will be flowed entirely will pop one's head in
The continuous injection under 15~25mm/s speed, the coefficient of consolidation position for reaching needs assessment depth soil stop injection, pass through ball
Type flows ten sensor for pore water pressure monitoring pore water pressure dissipation data on feeler inspection penetrometer entirely.When pore water pressure dissipation is to super
More than the 50%~80% of pore water pressure can then continue to carry out next survey with the downward injection of 15mm/s~25mm/s speed
Experimental tests.Nine pore pressures popped one's head in by the sensor for pore water pressure of piezocone penetration probe end, full stream feeler inspection ball-type sense
The dissipation of excess pore-water pressure data formula that device measures calculates the unearthed coefficient of consolidation, evaluates the engineering properties of the soil body.
The coefficient of consolidation calculation formula of hole pressure touching methods soil：
In formula：t50Time during-pore water pressure dissipation 50%；R- circular cone radiuses；Ir- rigidity index；T50During-dimensionless
Between factor.
The coefficient of consolidation calculation formula of full stream feeler inspection soil：
In formula, Db- feeler inspection ball-type probe diameter is flowed entirely；D- flows feeler inspection feeler lever diameter entirely；Ir- stiffness coefficient；tmax- pore water
Pressure reaches the time of maximum；t50Time during-pore water pressure dissipation 50%.
Claims (3)
1. one kind is based on the full discharge orifice pressure feeler inspection penetrometer of ball-type, it is characterised in that：Visited for hole pressure touching methods on the penetrometer top
Bar (5), in the bottom of piezocone penetration probe (5) connection conversion head (6), the full stream feeler inspection of connection in the bottom of conversion head (6)
Feeler lever (4), in the full stream feeler inspection ball-type probe (1) of bottom connection of stream feeler inspection feeler lever (4) entirely；In stream feeler inspection ball-type probe (1) entirely
In circumference transversely be provided with multiple sensor for pore water pressure (2), have pore pressure filter ring (3) outside the sensor for pore water pressure (2)；It is quiet in pore pressure
Power feeler inspection feeler lever (5) bottom and the junction of conversion head (6) are provided with a sensor for pore water pressure (2), have outside the sensor for pore water pressure (2)
Pore pressure filter ring (3)；
On described full stream feeler inspection ball-type probe (1), sensor for pore water pressure (2) has nine altogether, wherein stream feeler inspection ball-type probe entirely
(1) bottom one, largest circumference transversely are provided with four, the middle part surface four between largest circumference transversely and bottom
It is individual；
On described full stream feeler inspection ball-type probe (1), four sensor for pore water pressure (2) of largest circumference transversely are externally provided with one
Individual pore pressure filter ring (3), four sensor for pore water pressure (2) peripheral hardwares of the middle part surface between largest circumference transversely and bottom
There is a pore pressure filter ring (3), sensor for pore water pressure (2) is wrapped up.
It is 2. according to claim 1 based on the full discharge orifice pressure feeler inspection penetrometer of ball-type, it is characterised in that：Full stream feeler inspection ball-type is visited
Head (1) a diameter of 60mm, complete to flow feeler inspection feeler lever (4) a diameter of 20mm, length is 200~300mm, and piezocone penetration probe is straight
Footpath 35.7mm.
3. a kind of coefficient of consolidation evaluation method as claimed in claim 1 based on the full discharge orifice pressure feeler inspection penetrometer of ball-type, it is special
Sign is：The evaluation method is specific as follows：
1) needs by pore pressure filter ring (3) in the container of glycerine is filled, and in the true of 100kPa~120kPa before the test
More than saturation 24h under pneumatics power；
2) full stream feeler inspection ball-type probe (1) is arranged on after pore pressures filter ring (3) is fully saturated in the container of glycerine and pore pressure is quiet
Power feeler inspection feeler lever (5) bottom, probe (1) the continuous injection under 15mm/s~25mm/s speed of feeler inspection ball-type will be flowed entirely, will be reached
The coefficient of consolidation position of needs assessment depth soil stops injection, flows the sensor for pore water pressure (2) on feeler inspection penetrometer entirely by ball-type
Monitor pore water pressure dissipation data；
3) can then continue next after more than the 50%~80% of pore water pressure dissipation to excess pore water pressure
The test of point；
4) will pass through the hole of the sensor for pore water pressure (2) of piezocone penetration probe (5) bottom, full stream feeler inspection ball-type probe (1)
The dissipation of excess pore-water pressure data formula that pressure sensor (2) measures calculates the unearthed coefficient of consolidation, evaluates the engineering of the soil body
Property；
Wherein, the described coefficient of consolidation, calculation formula are as follows：
In formula：
t50Time during-pore water pressure dissipation 50%；
R- circular cone radiuses；
Ir- rigidity index；
T50- nondimensional time factor；
The coefficient of consolidation calculation formula of full stream feeler inspection soil：
In formula：
Db- feeler inspection ball-type probe diameter is flowed entirely；
D- flows feeler inspection feeler lever diameter entirely；
Ir- rigidity index；
tmax- pore water pressure reaches the time of maximum；
t50Time during-pore water pressure dissipation 50%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610546164.3A CN106192969B (en) | 2016-07-12 | 2016-07-12 | One kind is based on the full discharge orifice pressure feeler inspection penetrometer of ball-type and its coefficient of consolidation evaluation method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610546164.3A CN106192969B (en) | 2016-07-12 | 2016-07-12 | One kind is based on the full discharge orifice pressure feeler inspection penetrometer of ball-type and its coefficient of consolidation evaluation method |
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| CN106192969A CN106192969A (en) | 2016-12-07 |
| CN106192969B true CN106192969B (en) | 2018-02-02 |
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| CN107315080B (en) * | 2017-06-23 | 2020-04-07 | 中铁第四勘察设计院集团有限公司 | Method for measuring horizontal consolidation coefficient of saturated soft clay by utilizing flatshovel lateral expansion C value dissipation test |
| CN107727687B (en) * | 2017-11-14 | 2020-09-11 | 东南大学 | Off-axis thermal conductivity dynamic penetration in-situ testing device for testing thermal conductivity of soil body |
| CN108152170B (en) * | 2017-12-27 | 2020-04-07 | 大连理工大学 | Free falling type spherical penetrometer with propeller |
| AU2017425530B2 (en) * | 2017-12-27 | 2020-04-16 | Dalian University Of Technology | Free fall ball penetrometer with a booster |
| CN108265765A (en) * | 2018-03-22 | 2018-07-10 | 广东省水利电力勘测设计研究院 | A kind of detection device of mud soft soil foundation intensity |
| CN109098162A (en) * | 2018-10-26 | 2018-12-28 | 武汉吉欧信海洋科技股份有限公司 | It is a kind of with casing function can continuous injection underwater static sounding device |
| CN109975107A (en) * | 2019-04-12 | 2019-07-05 | 大连理工大学 | A kind of full flowing penetrometer of float for fishing shape probe |
| CN110824147B (en) * | 2019-12-17 | 2023-07-18 | 大连理工大学 | Full-flow ball type penetration device and method for laboratory and shipborne |
| CN112663586B (en) * | 2020-12-17 | 2022-08-12 | 江苏南京地质工程勘察院 | Multi-unit pore pressure matrix spherical full-flow injection device |
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| JP4642070B2 (en) * | 2004-03-23 | 2011-03-02 | ベンシック・ジオテック・プロプライエタリー・リミテッド | An improved ball penetration tester for soft soil investigations. |
| CN103147432B (en) * | 2013-02-18 | 2015-05-06 | 东南大学 | Spherical hole-pressure static cone penetration probe for detecting sludge |
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