CN105200971B - Device and method for testing pile-soil interface soil pressure and pore water pressure - Google Patents
Device and method for testing pile-soil interface soil pressure and pore water pressure Download PDFInfo
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- CN105200971B CN105200971B CN201510690779.9A CN201510690779A CN105200971B CN 105200971 B CN105200971 B CN 105200971B CN 201510690779 A CN201510690779 A CN 201510690779A CN 105200971 B CN105200971 B CN 105200971B
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- pressure gauge
- piezoresistance type
- silicon piezoresistance
- soil
- pressure
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Abstract
The invention belongs to the technical field of building construction equipment, and relates to a device and method for testing pile-soil interface soil pressure and pore water pressure. Silicon piezoresistive earth pressure gauges and silicon piezoresistive pore water pressure gauges are symmetrically mounted on different sections and at different pile ends on the outer side wall of the high-strength prestressed concrete pipe pile in an embedded manner; pile body drill holes are formed in the inner side of the top of the high-strength prestressed concrete pipe pile; armored cables are communicated with a high-speed static strain indicator YE2539 through the pipe body drill holes; the pile end of the high-strength prestressed concrete pipe pile adopts a steel plate to cover the bottom; the silicon piezoresistive earth pressure gauges and the silicon piezoresistive pore water pressure gauges arranged at the bottommost end are mounted at the bottom of the steel plate, and the gaging heads face downwards. Grooves matched with the armored cables are formed in the steel plate. The device is simple and compact in structure, small in size, light in weight, low in cost, convenient to operate, firm and durable, has excellent dynamic-static features, and is wide in measurement range, and high in measurement accuracy and sensitivity, and easily realizes the test on the soil pressure and pore water pressure at the pile-soil interface adjacent to the pile body.
Description
Technical field:
The invention belongs to construction implement technical field, it is related to adopt static pressure construction in a kind of ground and foundation engineering
Prefabricated pile stake Soil Interface soil pressure, stake Soil Interface pore water pressure force test device, high-strength prestressed particularly to a kind of static pressure
Concrete tubular pile is close to stake Soil Interface soil and pore water pressure force test device and the method for pile body.
Background technology:
In city, the dynamic piling such as traditional Driven Piles produces the environmental problems such as noise, vibration, and static pressed pile is right due to it
The features such as environmental effect is smaller has obtained increasingly being widely applied.To resting stage soil pressure after Jacked Pile Driving and pile sinking
Power and the measurement of pore water pressure, traditional method is embedding earth pressure gauge and hole in the affected soil layer of certain distance around stake
Gap WG, the change feelings of soil pressure and pore water pressure in the soil body of all certain distances of testing tube sunk pile pile
Condition, but from the stake Soil Interface mechanical characteristic that pile sinking starts, both reflected the penetrating resistance (pile driving pressure) in injection stage, reflect at any time again
Between change bearing capacity, next-door neighbour pile body stake Soil Interface at soil pressure and pore water pressure directly act on pile body, than away from
More important at pile body.It is limited to experimental test condition and research level, the research to stake Soil Interface is deep not enough at present, especially scarce
Weary next-door neighbour's pile body stake Soil Interface soil pressure and the accurate test of pore water pressure.Due to traditional earth pressure gauge and pore pressure gauge
Not high used in stake Soil Interface survival rate, it is not suitable for a Soil Interface soil pressure and the test of pore water pressure, therefore, design is a kind of
Stake Soil Interface soil and pore water pressure force test device and method, propose first using piezoresistive silicon sensor test soil pressure and hole
Gap water pressure, it is core parts that this kind of sensor adopts micromachined silicon diaphragm, and high accuracy integrated piezoresistance force sensing element, using the world
Advanced miniaturization making and packaging technology, carry out exquisiteness cleverly microencapsulated, and small product size is little, and compact conformation is lightweight,
Sturdy and durable, and there is excellent static and dynamic performance, range ability is wide, and this kind of test device and method yet there are no document report
Road.
Content of the invention:
It is an object of the invention to the shortcoming overcoming prior art to exist, seek to design by a kind of stake soil of next-door neighbour's pile body
The soil of interface and pore water pressure force test device and method, according to soil layer separating surface, symmetrical in pile body different cross section and stake end
Silicon piezoresistance type earth pressure gauge test pile Soil Interface soil lateral pressure is installed, is symmetrically installed silicon piezoresistance type hole in testing section simultaneously
WG test pile Soil Interface pore water pressure.
To achieve these goals, the agent structure of the present invention includes high-strength prestressed concrete pipe pile, silicon piezoresistance type soil
Piezometer, silicon piezoresistance type pore pressure gauge, armored optical cable, pile body boring, ye2539 high speed static deformeter and steel plate；According to
The separating surface of different soil, different cross section and stake on the high-strength prestressed concrete pipe pile lateral wall being formed using static pressure construction
Bottom is respectively embedded into formula and is symmetrically installed with silicon piezoresistance type earth pressure gauge and silicon piezoresistance type pore pressure gauge, adjacent silicon piezoresistance type soil
All connected by armored optical cable and adjacent silicon piezoresistance type pore pressure gauge between piezometer, and pour into epoxy resin envelope
Dress；Between adjacent silicon piezoresistance type earth pressure gauge and the distance between adjacent silicon piezoresistance type pore pressure gauge from stake end to stake bottom according to
Secondary reduction, close structure under formation is dredged；The inside top of high-strength prestressed concrete pipe pile has pile body boring, and armored optical cable leads to
Cross pile body boring to connect with ye2539 high speed static deformeter；It is 20mm that the stake bottom of high-strength prestressed concrete pipe pile adopts thickness
Steel plate back cover, the silicon piezoresistance type earth pressure gauge of lowermost end and silicon piezoresistance type pore pressure gauge be arranged on the bottom of steel plate, and
Gauge head down, steel plate has the hole slot with armored optical cable cooperation, to install armored optical cable.
Silicon piezoresistance type earth pressure gauge of the present invention and silicon piezoresistance type pore pressure gauge are all passed using silicon piezoresistance type pressure
Sensor, itself packing forms is that silicon foil gauge glass dust direct sintering is constituted on metallic membrane slug type pressure sensing
Device, the minimum diameter of silicon piezoresistance type pressure sensor is 4mm, and minimum constructive height is 10mm, and silicon piezoresistance type pressure sensor can make
Flexible member is with measured medium directly contact it is easy to miniaturization is it is adaptable to dynamic stress measures.
The detailed process that the present invention is tested to soil at stake Soil Interface and pore water pressure is:
(1), first cutting on high-strength prestressed concrete pipe pile, according to the separating surface of different soil, in different cross section and
Silicon piezoresistance type earth pressure gauge and silicon piezoresistance type pore pressure gauge are symmetrically implanted in stake bottom, pacify in the position of each sectional pressure meter simultaneously
Dress silicon piezoresistance type temperature-compensating meter, excludes the soil pressure because temperature produces and pore water pressure, silicon piezoresistance type earth pressure gauge and silicon
Pressure resistance type pore pressure gauge is in the intensive installation in high-strength prestressed concrete pipe pile stake bottom, silicon piezoresistance type earth pressure gauge and silicon pressure
The gauge head of resistive pore pressure gauge is flushed with stake surface, with the tentatively fixing silicon piezoresistance type earth pressure gauge of steel wire mould bases and silicon pressure drag
Carefully pour into epoxy encapsulation again behind the position of formula pore pressure gauge, and adjust levelling before epoxy resin solidification again；
(2), the stake bottom of high-strength prestressed concrete pipe pile is used the steel plate back cover of thick 20mm, and in steel plate bottom, silicon is installed
Pressure resistance type earth pressure gauge and silicon piezoresistance type pore pressure gauge, make silicon piezoresistance type earth pressure gauge and silicon piezoresistance type pore pressure gauge
Gauge head down, steel plate reserves with armored optical cable cooperation install hole slot；
(3), silicon piezoresistance type earth pressure gauge and silicon piezoresistance type pore pressure gauge are passed through cutting cabling respectively, by armouring
Optical cable passes through pile body boring to access ye2539 high speed static deformeter, and whole measuring point minimal sampling time are 1s, fully meet this
Project testing requires；During high-strength prestressed concrete pipe pile press-in, every according to the line of high-strength prestressed concrete pipe pile pile body
50cm read-record once, records earth pressure gauge reading and pore pressure gauge reading every time；
(4), adopt hugging pressure type static pile press that high-strength prestressed concrete pipe pile is pressed 2～3cm/s injection, be pressed onto every time
Unclamp after 2m that fixture is up to embrace pressure again, so complete a stroke, each stroke of high-strength prestressed concrete pipe pile is
The process of off-load loading again, records silicon piezoresistance type earth pressure gauge and silicon piezoresistance type pore pressure gauge in penetration process respectively
Current voltage value vdcCurrently, using formula pCurrently=pFull/vFull×vdcCurrently, calculate the lateral of high-strength prestressed concrete pipe pile respectively
Soil pressure and pore water pressure, wherein, pCurrentlyFor the current soil lateral pressure that records and pore water pressure force value, unit is kpa；pFull
For the full-scale pressure value of silicon piezoresistance type earth pressure gauge and silicon piezoresistance type pore pressure gauge, unit is kpa；vFullFor silicon piezoresistance type
The full range voltage value of earth pressure gauge and silicon piezoresistance type pore pressure gauge；vdcCurrentlyFor the current voltage value recording.
Compared with prior art, it is simple and compact for structure for the present invention, small volume, and lightweight, low cost is easy to operate, hard
Gu durable, there is excellent static and dynamic performance, range ability is wide, certainty of measurement is high, sensitivity is high, it is easy to accomplish next-door neighbour's pile body
Soil pressure at stake Soil Interface and the test of pore water pressure.
Brief description:
Fig. 1 is the agent structure principle schematic of the present invention.
Fig. 2 is the plan structure principle in silicon piezoresistance type earth pressure gauge according to the present invention and pore pressure gauge test pile
Schematic diagram.
Specific embodiment:
Below by embodiment and combine accompanying drawing the present invention is described in further detail.
Embodiment:
The agent structure of the present embodiment includes high-strength prestressed concrete pipe pile 1, silicon piezoresistance type earth pressure gauge 2, silicon pressure drag
Formula pore pressure gauge 3, armored optical cable 4, pile body boring 5, ye2539 high speed static deformeter 6 and steel plate 7；According to different soil
Separating surface, be respectively embedded into different cross section and stake bottom on high-strength prestressed concrete pipe pile 1 lateral wall of static pressure construction
Formula is symmetrically installed with silicon piezoresistance type earth pressure gauge 2 and silicon piezoresistance type pore pressure gauge 3, adjacent silicon piezoresistance type earth pressure gauge 2 it
Between all connected by armored optical cable 4 and adjacent silicon piezoresistance type pore pressure gauge 3 between, and pour into epoxy encapsulation；Adjacent
Subtract successively to stake bottom from stake end with the distance between adjacent silicon piezoresistance type pore pressure gauge 3 between silicon piezoresistance type earth pressure gauge 2
Little, close structure under formation is dredged；The inside top of high-strength prestressed concrete pipe pile 1 has pile body boring 5, and armored optical cable 4 leads to
Cross pile body boring 5 to connect with ye2539 high speed static deformeter 6；The stake bottom of high-strength prestressed concrete pipe pile 1 using thickness is
Steel plate 7 back cover of 20mm, the silicon piezoresistance type earth pressure gauge 2 of lowermost end and silicon piezoresistance type pore pressure gauge 3 are arranged on steel plate 7
Bottom, and gauge head is down, and steel plate 7 has the hole slot with armored optical cable 4 cooperation, to install armored optical cable 4.
Silicon piezoresistance type earth pressure gauge 2 described in the present embodiment and silicon piezoresistance type pore pressure gauge 3 are all using silicon piezoresistance type pressure
Force transducer, itself packing forms is silicon foil gauge glass dust direct sintering to be constituted on metallic membrane slug type pressure pass
Sensor, the minimum diameter of silicon piezoresistance type pressure sensor is 4mm, and minimum constructive height is 10mm, and silicon piezoresistance type pressure sensor can
Make flexible member with measured medium directly contact it is easy to miniaturization is it is adaptable to dynamic stress measures.
The detailed process that the present embodiment is tested to soil at stake Soil Interface and pore water pressure is:
(1), first cutting on high-strength prestressed concrete pipe pile 1, according to the separating surface of different soil, in different cross section and
Silicon piezoresistance type earth pressure gauge 2 and silicon piezoresistance type pore pressure gauge 3 are symmetrically implanted, simultaneously in the position of each sectional pressure meter in stake bottom
Silicon piezoresistance type temperature-compensating meter is installed, excludes the soil pressure because temperature produces and pore water pressure, silicon piezoresistance type earth pressure gauge 2 He
Silicon piezoresistance type pore pressure gauge 3 is in the intensive installation in 1 bottom of high-strength prestressed concrete pipe pile, silicon piezoresistance type earth pressure gauge 2
Flush with stake surface with the gauge head of silicon piezoresistance type pore pressure gauge 3, tentatively fix silicon piezoresistance type earth pressure gauge 2 with steel wire mould bases
Carefully pour into epoxy encapsulation with behind the position of silicon piezoresistance type pore pressure gauge 3 again, and before epoxy resin solidification again
Adjustment is levelling；
(2), the stake bottom of high-strength prestressed concrete pipe pile 1 is used steel plate 7 back cover of thick 20mm, and install in steel plate bottom
Silicon piezoresistance type earth pressure gauge 2 and silicon piezoresistance type pore pressure gauge 3, make silicon piezoresistance type earth pressure gauge 2 and silicon piezoresistance type pore water
The gauge head of piezometer 3 down, reserves the hole slot installed with armored optical cable 4 cooperation on steel plate 7；
(3), silicon piezoresistance type earth pressure gauge 2 and silicon piezoresistance type pore pressure gauge 3 are passed through cutting cabling respectively, by armour
Dress optical cable 4 passes through pile body boring 5 access ye2539 high speed static deformeter 6, and whole measuring point minimal sampling time are 1s, completely full
This project testing of foot requires；During high-strength prestressed concrete pipe pile 1 press-in, drawn according to high-strength prestressed concrete pipe pile 1 pile body
Line every 50cm read-record once, records earth pressure gauge reading and pore pressure gauge reading every time；
(4), adopt hugging pressure type static pile press that high-strength prestressed concrete pipe pile 1 is pressed 2～3cm/s injection, press every time
Unclamp that fixture is up to embrace pressure again to after 2m, so complete a stroke, each stroke of high-strength prestressed concrete pipe pile 1 is equal
For the process of off-load loading again, penetration process records silicon piezoresistance type earth pressure gauge 2 and silicon piezoresistance type pore water pressure respectively
The current voltage value vdc of meter 3Currently, using formula pCurrently=pFull/vFull×vdcCurrently, calculate high-strength prestressed concrete pipe pile 1 respectively
Soil lateral pressure and pore water pressure, wherein, pCurrentlyFor the current soil lateral pressure that records and pore water pressure force value, unit is
kpa；pFullFor the full-scale pressure value of silicon piezoresistance type earth pressure gauge 2 and silicon piezoresistance type pore pressure gauge 3, unit is kpa；vFullFor
The full range voltage value of silicon piezoresistance type earth pressure gauge 2 and silicon piezoresistance type pore pressure gauge 3；vdcCurrentlyFor the current voltage recording
Value.
Claims (3)
1. at a kind of Soil Interface soil and pore water pressure method of testing it is characterised in that stake Soil Interface soil and pore water pressure
Realize in force test device, its detailed process is:
(1), first cutting on high-strength prestressed concrete pipe pile, according to the separating surface of different soil, at different cross section and stake bottom
Symmetrical implantation silicon piezoresistance type earth pressure gauge and silicon piezoresistance type pore pressure gauge, install silicon in the position of each sectional pressure meter simultaneously
Voltage-resistor type temp compensates meter, excludes the soil pressure because temperature produces and pore water pressure, silicon piezoresistance type earth pressure gauge and silicon pressure drag
Formula pore pressure gauge is in the intensive installation in high-strength prestressed concrete pipe pile stake bottom, silicon piezoresistance type earth pressure gauge and silicon piezoresistance type
The gauge head of pore pressure gauge is flushed with stake surface, with the tentatively fixing silicon piezoresistance type earth pressure gauge of steel wire mould bases and silicon piezoresistance type hole
Carefully pour into epoxy encapsulation again behind the position of gap WG, and adjust levelling before epoxy resin solidification again；
(2), the stake bottom of high-strength prestressed concrete pipe pile is used the steel plate back cover of thick 20mm, and in steel plate bottom, silicon pressure drag is installed
Formula earth pressure gauge and silicon piezoresistance type pore pressure gauge, make silicon piezoresistance type earth pressure gauge and the survey of silicon piezoresistance type pore pressure gauge
Upside down, the hole slot installed with armored optical cable cooperation is reserved on steel plate；
(3), silicon piezoresistance type earth pressure gauge and silicon piezoresistance type pore pressure gauge are passed through cutting cabling respectively, by armored optical cable
Through pile body hole access ye2539 high speed static deformeter, high-strength prestressed concrete pipe pile press-in when, according to high-strength pre- should
Power concrete tubular pile pile body rules every 50cm read-record once, and record earth pressure gauge reading and pore pressure gauge are read every time
Number；
(4), hugging pressure type static pile press is adopted high-strength prestressed concrete pipe pile to be pressed 2～3cm/s injection, after being pressed onto 2m every time
Unclamp the up pressure of embracing again of fixture and complete a stroke, penetration process records silicon piezoresistance type earth pressure gauge and silicon pressure drag respectively
The current voltage value vdc of formula pore pressure gaugeCurrently, using formula pCurrently=pFull/vFull×vdcCurrently, calculate high-strength prestressed respectively
The soil lateral pressure of concrete tubular pile and pore water pressure, wherein, pCurrentlyFor the current soil lateral pressure that records and pore water pressure
Value, unit is kpa；pFullFor the full-scale pressure value of silicon piezoresistance type earth pressure gauge and silicon piezoresistance type pore pressure gauge, unit is
kpa；vFullFull range voltage value for silicon piezoresistance type earth pressure gauge and silicon piezoresistance type pore pressure gauge；vdcCurrentlyFor working as of recording
Front magnitude of voltage.
2. according to claim 1 at stake Soil Interface soil and pore water pressure method of testing it is characterised in that described stake is native
The agent structure of interface soil and pore water pressure force test device includes high-strength prestressed concrete pipe pile, silicon piezoresistance type soil pressure
Meter, the boring of silicon piezoresistance type pore pressure gauge, armored optical cable, pile body, ye2539 high speed static deformeter and steel plate；According to difference
The separating surface of soil layer, on the high-strength prestressed concrete pipe pile lateral wall being formed with static pressure construction, different cross section and stake bottom are divided
Not embedded it is symmetrically installed with silicon piezoresistance type earth pressure gauge and silicon piezoresistance type pore pressure gauge, adjacent silicon piezoresistance type earth pressure gauge
Between all connected by armored optical cable and adjacent silicon piezoresistance type pore pressure gauge between, and pour into epoxy encapsulation；Adjacent
It is sequentially reduced to stake bottom from stake end with the distance between adjacent silicon piezoresistance type pore pressure gauge between silicon piezoresistance type earth pressure gauge,
Close structure under dredging in formation；The inside top of high-strength prestressed concrete pipe pile has pile body boring, and armored optical cable passes through pile body
Boring is connected with ye2539 high speed static deformeter；The stake bottom of high-strength prestressed concrete pipe pile adopts the steel plate that thickness is 20mm
Back cover, the silicon piezoresistance type earth pressure gauge of lowermost end and silicon piezoresistance type pore pressure gauge are arranged on the bottom of steel plate, and gauge head court
Under, steel plate has the hole slot with armored optical cable cooperation, to install armored optical cable.
3. according to claim 2 at stake Soil Interface the method for testing of soil and pore water pressure it is characterised in that described silicon pressure
, all using silicon piezoresistance type pressure sensor, itself packing forms is by silicon for resistive earth pressure gauge and silicon piezoresistance type pore pressure gauge
Foil gauge glass dust direct sintering constitutes slug type pressure transducer on metallic membrane, and silicon piezoresistance type pressure sensor is
Minor diameter is 4mm, and minimum constructive height is 10mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510690779.9A CN105200971B (en) | 2015-10-22 | 2015-10-22 | Device and method for testing pile-soil interface soil pressure and pore water pressure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510690779.9A CN105200971B (en) | 2015-10-22 | 2015-10-22 | Device and method for testing pile-soil interface soil pressure and pore water pressure |
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| CN105200971A CN105200971A (en) | 2015-12-30 |
| CN105200971B true CN105200971B (en) | 2017-01-18 |
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| CN201510690779.9A Expired - Fee Related CN105200971B (en) | 2015-10-22 | 2015-10-22 | Device and method for testing pile-soil interface soil pressure and pore water pressure |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105780821A (en) * | 2016-03-10 | 2016-07-20 | 青岛理工大学 | Device for distributing indoor model pile pile-body fiber bragg grating and pile soil interface sensors |
| CN105756104B (en) * | 2016-03-10 | 2018-07-03 | 青岛理工大学 | A kind of indoor model stake body fiber grating and stake Soil Interface sensor installation aiding device |
| CN105649123B (en) * | 2016-03-21 | 2018-05-29 | 青岛理工大学琴岛学院 | A kind of model test method simulated stake side radial stress and influenced on pile shaft force |
| CN105649122B (en) * | 2016-03-21 | 2018-05-29 | 青岛理工大学琴岛学院 | A kind of model test apparatus simulated stake side radial stress and influenced on pile shaft force |
| CN106013276A (en) * | 2016-07-04 | 2016-10-12 | 中国电建集团华东勘测设计研究院有限公司 | Stress-strain testing system for large-diameter steel pipe pile of offshore wind turbine and construction method |
| CN107034870A (en) * | 2017-05-04 | 2017-08-11 | 同济大学 | A kind of device for testing pore water pressure |
| CN107642112A (en) * | 2017-09-30 | 2018-01-30 | 青岛理工大学 | A kind of end open type PHC pile tube end resistance test devices |
| CN108896237B (en) * | 2018-07-13 | 2020-05-05 | 武汉市市政建设集团有限公司 | Pore water pressure monitoring sensor suitable for geotechnical structure |
| CN108842837A (en) * | 2018-07-25 | 2018-11-20 | 青岛理工大学 | A kind of end seals precast concrete enlarged footing cast stake |
| CN109457740B (en) * | 2018-12-06 | 2023-08-22 | 宁波大学 | Measuring instrument capable of simultaneously measuring pile soil interface friction force, normal stress and pore water pressure and assembling and using method thereof |
| CN112033586A (en) * | 2020-07-20 | 2020-12-04 | 武汉理工大学 | Pressure sensor based on FBG (fiber Bragg Grating) and 3D fused deposition technology and preparation method thereof |
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| CN103233453A (en) * | 2013-04-18 | 2013-08-07 | 天津大学 | In-situ soil exploration device and in-situ soil exploration method |
| CN203479436U (en) * | 2013-10-12 | 2014-03-12 | 青岛理工大学 | Pile body stress test apparatus for static-pressure prestressed high-strength concrete pile |
| CN203498879U (en) * | 2013-10-22 | 2014-03-26 | 闫楠 | Resistance testing device for pile end of pre-stress high-strength concrete tubular pile |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2000019040A (en) * | 1998-06-30 | 2000-01-21 | Shimadzu Corp | Method for manufacturing pressure sensor |
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|---|---|---|---|---|
| CN103233453A (en) * | 2013-04-18 | 2013-08-07 | 天津大学 | In-situ soil exploration device and in-situ soil exploration method |
| CN203479436U (en) * | 2013-10-12 | 2014-03-12 | 青岛理工大学 | Pile body stress test apparatus for static-pressure prestressed high-strength concrete pile |
| CN203498879U (en) * | 2013-10-22 | 2014-03-26 | 闫楠 | Resistance testing device for pile end of pre-stress high-strength concrete tubular pile |
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