CN105200971A - 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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- CN105200971A CN105200971A CN201510690779.9A CN201510690779A CN105200971A CN 105200971 A CN105200971 A CN 105200971A CN 201510690779 A CN201510690779 A CN 201510690779A CN 105200971 A CN105200971 A CN 105200971A
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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, relate to the preformed pile stake Soil Interface soil pressure, the stake Soil Interface pore water pressure force test device that adopt static pressure construction in a kind of groundsill and foundation engineering, particularly the stake Soil Interface soil of a kind of static pressure high-strength prestressed concrete pipe pile next-door neighbour pile body and pore water pressure force test device and method.
Background technology:
In city, the dynamic piling such as traditional Driven Piles produces the environmental problem such as noise, vibration, and static pressed pile is applied more and more widely because it obtains features such as ambient influnence are smaller.To after Jacked Pile Driving and pile sinking stand-down soil pressure and the measurement of pore water pressure, conventional method is that in the affected soil layer of certain distance, embedding soil pressure takes into account pore pressure gauge around stake, the situation of change of soil pressure and pore water pressure in the soil body of all certain distances of testing tube sunk pile pile, but the stake Soil Interface mechanical characteristic from pile sinking, both the penetrating resistance (pile driving pressure) in injection stage had been reflected, reflect again time dependent bearing capacity, soil pressure and the pore water pressure at the stake Soil Interface place of next-door neighbour's pile body directly act on pile body, than more important away from pile body place.Be limited to experimental test condition and research level, deep not enough to the research of stake Soil Interface at present, especially lack the accurate test of next-door neighbour's pile body stake Soil Interface soil pressure and pore water pressure.Because traditional soil pressure takes into account pore pressure gauge, to be used in a Soil Interface survival rate not high, be not suitable for the test of a Soil Interface soil pressure and pore water pressure, therefore, design a kind of stake Soil Interface soil and pore water pressure force test device and method, propose first to adopt piezoresistive silicon sensor test soil pressure and pore water pressure, this kind of sensor adopts micromachined silicon diaphragm to be core parts, high accuracy integrated piezoresistance force sensing element, utilize international advanced microminiaturization making and packaging technology, carry out exquisiteness microencapsulated cleverly, small product size is little, compact conformation, lightweight, sturdy and durable, and there is excellent static and dynamic performance, range ability is wide, this kind of testing arrangement and method yet there are no bibliographical information.
Summary of the invention:
The object of the invention is to the shortcoming overcoming prior art existence, seek to design the soil and pore water pressure force test device and method that are close to the stake Soil Interface place of pile body by a kind of, according to soil layer interface, at pile body different cross section and stake end symmetry, silicon piezoresistance type earth pressure gauge test pile Soil Interface lateral earth pressure is installed, at testing section symmetrical installation silicon piezoresistance type pore pressure gauge test pile Soil Interface pore water pressure simultaneously.
To achieve these goals, agent structure of the present invention comprises high-strength prestressed concrete pipe pile, silicon piezoresistance type earth pressure gauge, silicon piezoresistance type pore pressure gauge, armored optical cable, pile body boring, YE2539 high speed static strain gauge and steel plate; According to the interface of different soil, different cross section and stake end place is embedded is respectively symmetrically installed with silicon piezoresistance type earth pressure gauge and silicon piezoresistance type pore pressure gauge on the high-strength prestressed concrete pipe pile lateral wall adopting static pressure construction to be formed, all connected by armored optical cable between adjacent silicon pressure resistance type earth pressure gauge and between adjacent silicon pressure resistance type pore pressure gauge, and pour into epoxy encapsulation; Distance between adjacent silicon pressure resistance type earth pressure gauge and between adjacent silicon pressure resistance type pore pressure gauge reduces successively at the bottom of stake end to stake, formation is dredged lower close structure; The inside top of high-strength prestressed concrete pipe pile has pile body boring, and armored optical cable is communicated with YE2539 high speed static strain gauge by pile body boring; The stake end employing thickness of high-strength prestressed concrete pipe pile is the steel plate back cover of 20mm, 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 down, steel plate has the hole slot coordinated with armored optical cable, to install armored optical cable.
Silicon piezoresistance type earth pressure gauge of the present invention and silicon piezoresistance type hole pressure meter all adopt silicon piezoresistance type pressure sensor, self packing forms for form slug type pressure sensor by silicon foil gauge glass dust direct sintering on metallic membrane, the minimum diameter of silicon piezoresistance type pressure sensor is 4mm, minimum constructive height is 10mm, silicon piezoresistance type pressure sensor can make flexible member directly contact with measured medium, be easy to miniaturization, be applicable to dynamic stress and measure.
The present invention to the detailed process that stake Soil Interface place soil and pore water pressure are tested is:
(1), first cutting on high-strength prestressed concrete pipe pile, according to the interface of different soil, symmetrical implanted silicon pressure resistance type earth pressure gauge and silicon piezoresistance type pore pressure gauge is held at different cross section and stake, silicon piezoresistance type temperature-compensating meter is installed in the position of each sectional pressure meter simultaneously, get rid of soil pressure and the pore water pressure of Yin Wendu generation, silicon piezoresistance type earth pressure gauge and silicon piezoresistance type pore pressure gauge are in the intensive installation in high-strength prestressed concrete pipe pile stake bottom, the gauge head of pressure resistance type earth pressure gauge and silicon piezoresistance type pore pressure gauge flushes with stake surface, carefully epoxy encapsulation is poured into again tentatively fix the position of pressure resistance type earth pressure gauge and silicon piezoresistance type pore pressure gauge with steel wire mould bases after, and again adjust levelling before epoxy resin solidifies,
(2), by the steel plate back cover of the stake end of high-strength prestressed concrete pipe pile with thick 20mm, and in steel plate bottom, silicon piezoresistance type earth pressure gauge and silicon piezoresistance type pore pressure gauge are installed, make the gauge head of silicon piezoresistance type earth pressure gauge and silicon piezoresistance type pore pressure gauge down, steel plate reserves the hole slot coordinating with armored optical cable and install;
(3), by silicon piezoresistance type earth pressure gauge and silicon piezoresistance type pore pressure gauge respectively by cutting cabling, by armored optical cable through pile body boring access YE2539 high speed static strain gauge, whole measuring point minimal sampling time is 1s, meets the requirement of this project testing completely; During high-strength prestressed concrete pipe pile press-in, rule every 50cm read-record once according to high-strength prestressed concrete pipe pile pile body, each record earth pressure gauge reading and pore pressure gauge reading;
(5) hugging pressure type static pile press, is adopted by high-strength prestressed concrete pipe pile by 2 ~ 3cm/s injection, unclamp after being pressed onto 2m that fixture is up embraces pressure again at every turn, so complete a stroke, each stroke of high-strength prestressed concrete pipe pile is the process of off-load loading again, in penetration process, record the current voltage value VDC of silicon piezoresistance type earth pressure gauge and silicon piezoresistance type pore pressure gauge respectively, utilize formula P
current=P
full/ V
full× VDC
current, calculate lateral earth pressure and the pore water pressure of high-strength prestressed concrete pipe pile respectively, wherein, P
currentfor the current lateral earth pressure that records and pore water pressure force value, unit is kPa; P
fullfor the full-scale pressure value of silicon piezoresistance type earth pressure gauge and silicon piezoresistance type pore pressure gauge, unit is kPa; V
fullfor the full range voltage value of silicon piezoresistance type earth pressure gauge and silicon piezoresistance type pore pressure gauge; VDC
currentfor the current voltage value recorded.
The present invention compared with prior art, it is simple and compact for structure, and volume is little, lightweight, cost is low, easy to operate, sturdy and durable, there is excellent static and dynamic performance, range ability is wide, certainty of measurement is high, highly sensitive, is easy to the soil pressure at stake Soil Interface place and the test of pore water pressure that realize next-door neighbour's pile body.
Accompanying drawing illustrates:
Fig. 1 is agent structure principle schematic of the present invention.
Fig. 2 is the plan structure principle schematic in the silicon piezoresistance type earth pressure gauge and pore pressure gauge test pile that the present invention relates to.
Detailed description of the invention:
Also by reference to the accompanying drawings the present invention is described in further detail below by embodiment.
Embodiment:
The agent structure of the present embodiment comprises high-strength prestressed concrete pipe pile 1, silicon piezoresistance type earth pressure gauge 2, silicon piezoresistance type pore pressure gauge 3, armored optical cable 4, pile body boring 5, YE2539 high speed static strain gauge 6 and steel plate 7; According to the interface of different soil, silicon piezoresistance type earth pressure gauge 2 and silicon piezoresistance type pore pressure gauge 3 is symmetrically installed with different cross section and stake end place on high-strength prestressed concrete pipe pile 1 lateral wall of static pressure construction are embedded respectively, all connected by armored optical cable 4 between adjacent silicon pressure resistance type earth pressure gauge 2 and between the silicon piezoresistance type pore pressure gauge 3 of phase, and pour into epoxy encapsulation; Distance between the silicon piezoresistance type earth pressure gauge 2 of phase and between adjacent silicon pressure resistance type pore pressure gauge 3 reduces successively at the bottom of stake end to stake, formation is dredged lower close structure; The inside top of high-strength prestressed concrete pipe pile 1 has pile body boring 5, and armored optical cable 4 is communicated with YE2539 high speed static strain gauge 6 by pile body boring 5; The stake end employing thickness of high-strength prestressed concrete pipe pile 1 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 7 are arranged on the bottom of steel plate 7, and gauge head down, steel plate 7 has the hole slot coordinated with armored optical cable 4, to install armored optical cable 4.
Silicon piezoresistance type earth pressure gauge 2 described in the present embodiment and silicon piezoresistance type hole pressure meter 3 all adopt silicon piezoresistance type pressure sensor, self packing forms for form slug type pressure sensor by silicon foil gauge glass dust direct sintering on metallic membrane, the minimum diameter of silicon piezoresistance type pressure sensor is 4mm, minimum constructive height is 10mm, silicon piezoresistance type pressure sensor can make flexible member directly contact with measured medium, be easy to miniaturization, be applicable to dynamic stress and measure.
The present embodiment to the detailed process that stake Soil Interface place soil and pore water pressure are tested is:
(1), first cutting on high-strength prestressed concrete pipe pile 1, according to the interface of different soil, symmetrical implanted silicon pressure resistance type earth pressure gauge 2 and silicon piezoresistance type pore pressure gauge 3 is held at different cross section and stake, silicon piezoresistance type temperature-compensating meter is installed in the position of each sectional pressure meter simultaneously, get rid of soil pressure and the pore water pressure of Yin Wendu generation, silicon piezoresistance type earth pressure gauge 2 and silicon piezoresistance type pore pressure gauge 3 are in high-strength prestressed concrete pipe pile 1 intensive installation in bottom, the gauge head of pressure resistance type earth pressure gauge 2 and silicon piezoresistance type pore pressure gauge 3 flushes with stake surface, carefully epoxy encapsulation is poured into again tentatively fix the position of pressure resistance type earth pressure gauge 2 and silicon piezoresistance type pore pressure gauge 3 with steel wire mould bases after, and again adjust levelling before epoxy resin solidifies,
(2), by steel plate 7 back cover of the stake end of high-strength prestressed concrete pipe pile 1 with thick 20mm, and in steel plate bottom, silicon piezoresistance type earth pressure gauge 2 and silicon piezoresistance type pore pressure gauge 3 are installed, the gauge head making silicon piezoresistance type earth pressure gauge 2 and silicon piezoresistance type pore pressure gauge 3 down, steel plate 7 reserves and coordinates with armored optical cable 4 hole slot installed;
(3), by silicon piezoresistance type earth pressure gauge 2 and silicon piezoresistance type pore pressure gauge 3 respectively by cutting cabling, by armored optical cable 4 through pile body boring 5 access YE2539 high speed static strain gauge 6, whole measuring point minimal sampling time is 1s, meets the requirement of this project testing completely; When high-strength prestressed concrete pipe pile 1 is pressed into, rule every 50cm read-record once according to high-strength prestressed concrete pipe pile 1 pile body, each record earth pressure gauge reading and pore pressure gauge reading;
(5) hugging pressure type static pile press, is adopted by high-strength prestressed concrete pipe pile 1 by 2 ~ 3cm/s injection, unclamp after being pressed onto 2m that fixture is up embraces pressure again at every turn, so complete a stroke, each stroke of high-strength prestressed concrete pipe pile 1 is the process of off-load loading again, in penetration process, record the current voltage value VDC of silicon piezoresistance type earth pressure gauge 2 and silicon piezoresistance type pore pressure gauge 3 respectively, utilize formula P
current=P
full/ V
full× VDC
current, calculate lateral earth pressure and the pore water pressure of high-strength prestressed concrete pipe pile 1 respectively, wherein, P
currentfor the current lateral earth pressure that records and pore water pressure force value, unit is kPa; P
fullfor the full-scale pressure value of silicon piezoresistance type earth pressure gauge 2 and silicon piezoresistance type pore pressure gauge 3, unit is kPa; V
fullfor the full range voltage value of silicon piezoresistance type earth pressure gauge 2 and silicon piezoresistance type pore pressure gauge 3; VDC
currentfor the current voltage value recorded.
Claims (3)
1. stake Soil Interface soil and a pore water pressure force test device, is characterized in that agent structure comprises high-strength prestressed concrete pipe pile, silicon piezoresistance type earth pressure gauge, silicon piezoresistance type pore pressure gauge, armored optical cable, pile body boring, YE2539 high speed static strain gauge and steel plate; According to the interface of different soil, different cross section and stake end place is embedded is respectively symmetrically installed with silicon piezoresistance type earth pressure gauge and silicon piezoresistance type pore pressure gauge on the high-strength prestressed concrete pipe pile lateral wall formed with static pressure construction, all connected by armored optical cable between adjacent silicon pressure resistance type earth pressure gauge and between adjacent silicon pressure resistance type pore pressure gauge, and pour into epoxy encapsulation; Distance between adjacent silicon pressure resistance type earth pressure gauge and between adjacent silicon pressure resistance type pore pressure gauge reduces successively at the bottom of stake end to stake, formation is dredged lower close structure; The inside top of high-strength prestressed concrete pipe pile has pile body boring, and armored optical cable is communicated with YE2539 high speed static strain gauge by pile body boring; The stake end employing thickness of high-strength prestressed concrete pipe pile is the steel plate back cover of 20mm, 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 down, steel plate has the hole slot coordinated with armored optical cable, to install armored optical cable.
2. according to claim 1 stake Soil Interface soil and pore water pressure force test device, it is characterized in that described silicon piezoresistance type earth pressure gauge and silicon piezoresistance type hole pressure meter all adopt silicon piezoresistance type pressure sensor, self packing forms for form slug type pressure sensor by silicon foil gauge glass dust direct sintering on metallic membrane, the minimum diameter of silicon piezoresistance type pressure sensor is 4mm, and minimum constructive height is 10mm.
3. adopt a method for device to test stake Soil Interface place soil and pore water pressure as claimed in claim 2, it is characterized in that detailed process is:
(1), first cutting on high-strength prestressed concrete pipe pile, according to the interface of different soil, symmetrical implanted silicon pressure resistance type earth pressure gauge and silicon piezoresistance type pore pressure gauge is held at different cross section and stake, silicon piezoresistance type temperature-compensating meter is installed in the position of each sectional pressure meter simultaneously, get rid of soil pressure and the pore water pressure of Yin Wendu generation, silicon piezoresistance type earth pressure gauge and silicon piezoresistance type pore pressure gauge are in the intensive installation in high-strength prestressed concrete pipe pile stake bottom, the gauge head of pressure resistance type earth pressure gauge and silicon piezoresistance type pore pressure gauge flushes with stake surface, carefully epoxy encapsulation is poured into again tentatively fix the position of pressure resistance type earth pressure gauge and silicon piezoresistance type pore pressure gauge with steel wire mould bases after, and again adjust levelling before epoxy resin solidifies,
(2), by the steel plate back cover of the stake end of high-strength prestressed concrete pipe pile with thick 20mm, and in steel plate bottom, silicon piezoresistance type earth pressure gauge and silicon piezoresistance type pore pressure gauge are installed, make the gauge head of silicon piezoresistance type earth pressure gauge and silicon piezoresistance type pore pressure gauge down, steel plate reserves the hole slot coordinating with armored optical cable and install;
(3), by silicon piezoresistance type earth pressure gauge and silicon piezoresistance type pore pressure gauge respectively by cutting cabling, by armored optical cable through pile body boring access YE2539 high speed static strain gauge, during high-strength prestressed concrete pipe pile press-in, rule every 50cm read-record once, each record earth pressure gauge reading and pore pressure gauge reading according to high-strength prestressed concrete pipe pile pile body;
(5) hugging pressure type static pile press, is adopted by high-strength prestressed concrete pipe pile by 2 ~ 3cm/s injection, unclamp the up pressure of again embracing of fixture at every turn after being pressed onto 2m and complete a stroke, in penetration process, record the current voltage value VDC of silicon piezoresistance type earth pressure gauge and silicon piezoresistance type pore pressure gauge respectively, utilize formula P
current=P
full/ V
full× VDC
current, calculate lateral earth pressure and the pore water pressure of high-strength prestressed concrete pipe pile respectively, wherein, P
currentfor the current lateral earth pressure that records and pore water pressure force value, unit is kPa; P
fullfor the full-scale pressure value of silicon piezoresistance type earth pressure gauge and silicon piezoresistance type pore pressure gauge, unit is kPa; V
fullfor the full range voltage value of silicon piezoresistance type earth pressure gauge and silicon piezoresistance type pore pressure gauge; VDC
currentfor the current voltage value recorded.
Priority Applications (1)
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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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| 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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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105649123A (en) * | 2016-03-21 | 2016-06-08 | 青岛理工大学琴岛学院 | Model testing method simulating influence of pile side radial stress on pile body axial stress |
| CN105649122A (en) * | 2016-03-21 | 2016-06-08 | 青岛理工大学琴岛学院 | Model testing device simulating influence of pile side radial stress on pile body axial stress |
| CN105756104A (en) * | 2016-03-10 | 2016-07-13 | 青岛理工大学 | Indoor model pile body fiber grating and pile-soil interface sensor arrangement device |
| 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 |
| 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 |
| 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 |
| CN108896237A (en) * | 2018-07-13 | 2018-11-27 | 武汉市市政建设集团有限公司 | Monitoring pore water pressure sensor suitable for earthen structure |
| CN109457740A (en) * | 2018-12-06 | 2019-03-12 | 宁波大学 | A Soil Interface frictional resistance, the measuring instrument of normal stress and pore water pressure and its assembling application method can be measured simultaneously |
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN105756104A (en) * | 2016-03-10 | 2016-07-13 | 青岛理工大学 | Indoor model pile body fiber grating and pile-soil interface sensor arrangement device |
| 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 |
| CN105649122A (en) * | 2016-03-21 | 2016-06-08 | 青岛理工大学琴岛学院 | Model testing device simulating influence of pile side radial stress on pile body axial stress |
| CN105649123A (en) * | 2016-03-21 | 2016-06-08 | 青岛理工大学琴岛学院 | Model testing method simulating influence of pile side radial stress on pile body axial stress |
| 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 |
| 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 |
| CN108896237A (en) * | 2018-07-13 | 2018-11-27 | 武汉市市政建设集团有限公司 | Monitoring pore water pressure sensor suitable for earthen structure |
| 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 |
| CN109457740A (en) * | 2018-12-06 | 2019-03-12 | 宁波大学 | A Soil Interface frictional resistance, the measuring instrument of normal stress and pore water pressure and its assembling application method can be measured simultaneously |
| 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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