CN105136864B - Can the native moisture content of different depth and the detector of dry density under on-the-spot test earth's surface - Google Patents
Can the native moisture content of different depth and the detector of dry density under on-the-spot test earth's surface Download PDFInfo
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- CN105136864B CN105136864B CN201510583197.0A CN201510583197A CN105136864B CN 105136864 B CN105136864 B CN 105136864B CN 201510583197 A CN201510583197 A CN 201510583197A CN 105136864 B CN105136864 B CN 105136864B
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Abstract
The invention discloses it is a kind of can the native moisture content of different depth and the detector of dry density under on-the-spot test earth's surface, the detector is one cylindric, built-in coaxial cable (1), top is feeler lever connector (2), water proof ring (3) is provided with feeler lever connector (2), the bottom of water proof ring (3) is analog-digital converter (4), analog-digital converter (4) is connected with coaxial cable (1), transmission line (5) has two outsides for being located at detector, it is coiled in by the way that epoxy resin adhesive is parallel in a spiral fashion on the outside of nylon sleeve (6), the inside of nylon sleeve (6) is steel core (7), the bottom of detector is conductivity sensor (8), conductivity sensor (8) is connected by coaxial cable (1) with analog-digital converter (4), conehead (9) is located at the bottom of steel core (7), it is internal that conductivity sensor (8) is located at conehead (9).The features such as detector has simple, easy to operate, multi-functional, can rapidly and accurately determine different depth soil's water content and density under earth's surface.
Description
Technical field
The present invention relates to a kind of Multifunctional detector, belonging in Geotechnical Engineering field one kind can be in situ, continuous, exactly
Test the native moisture content of different depth under earth's surface and the multi-functional static sounding device of dry density.
Background technology
In Geotechnical Engineering field, the research about native moisture content and dry density under earth's surface becomes more and more important.Soil is aqueous
Rate and two important parameters that density is that the Geotechnical Engineerings such as basis, embankment, dam, retaining wall, slope are built.The mechanical property of soil
Intensity and deformation including soil etc. are closely bound up all with soil's water content.The change of soil's water content usually brings many engineering things
Therefore, and these accidents are required for accurately grasping soil's water content and dry density.The conventional Time-domain of domestic relatively maturation now is anti-
Meter technology is penetrated to be widely used among the native volumetric water content of measurement, volume conductance and Rock And Soil deformation.The conventional testing techniques have
Have the advantages that measurement is easy, measuring speed is fast, precision is high, data transfer is flexible.But this conventional Time-domain reflectometry techniques can only
Measure shallow-layer soil's water content under earth's surface, it is impossible to the moisture content for the soil layer that fathoms, and can not measure filling's dry density simultaneously,
It is difficult to meet correlative study and design needs.Therefore the technical merit for improving native moisture content under test earth's surface seems very necessary
's.
The present invention based on traditional measuring technology, propose one kind can under on-the-spot test earth's surface the native moisture content of different depth with it is dry
The detector of density, the present invention solves the problem of can only testing shallow soil moisture content, contains while realizing while measuring soil
The target of water rate and dry density, accurately and effectively appraisal tool is provided for rock-soil engineering in-situ test.
The content of the invention
Technical problem：The technical problem to be solved in the present invention is lacked for current domestic technique probe functionality is single
Fall into, propose it is a kind of available for Geotechnical Engineering field can under on-the-spot test earth's surface the native moisture content of different depth and dry density detection
Device.
Technical scheme：The present invention be it is a kind of can under on-the-spot test earth's surface the native moisture content of different depth and dry density detection
Device, the detector is one cylindric, including coaxial cable, feeler lever connector, water proof ring, analog-digital converter, transmission
Line, nylon sleeve, steel core, conductivity sensor, conehead；The detector top is to be provided with feeler lever connector, feeler lever connector
Water proof ring, the bottom of water proof ring is analog-digital converter, and analog-digital converter is connected with coaxial cable, and transmission line has two to be located at spy
The outside of device is surveyed, is coiled in by the way that epoxy resin adhesive is parallel in a spiral fashion on the outside of nylon sleeve, nylon sleeve
Inside be steel core, the bottom of detector is conductivity sensor, and conductivity sensor passes through coaxial cable and analog-digital converter
It is connected, conehead is located at the bottom of steel core, conductivity sensor is located inside conehead.
The height of feeler lever connector is 70mm, a diameter of 43.7mm.
On two parallel transmission lines are coiled on the outside of nylon sleeve in a spiral fashion, its spacing is 40mm.
The sectional area of transmission line is 12mm2。
The thickness of nylon sleeve is 7mm.
The height of steel core is 180mm.
The cone angle of conehead is 30 °, and conical base sectional area is 15cm2。
The present invention's can be used for the native moisture content of different depth and the detector of dry density under on-the-spot test earth's surface, be using quiet
Power feeler inspection penetrometer is by detector so that under the direct injection earth's surface of 1.2m/min speed, then utilization impulse sender launches high frequency
Electromagnetic impulse, dielectric constant of the speed that high-frequency electromagnetic wave impulse is propagated along transmission line in soil dependent on soil, such as following formula
It is shown：
K is native apparent dielectric constant in formula；C is the light velocity (3*108m/s)；V is spread speed；L is detector length；t
For the time of pulse propagation.
Dielectric constant is mainly influenceed by native moisture content, and according to frequency electromagnetic waves, frequencies of propagation or Time Calculation go out in media as well
The dielectric constant of soil.When the signal reflex of high-frequency electromagnetic wave impulse returns to cable tester, the decay of reflected signal can be grasped
Amount, and the attenuation of reflected signal is related to the electrical conductivity of soil, you can the electrical conductivity that must be unearthed by the attenuation of reflected signal.
The dielectric constant and attenuation degree obtained by measuring and calculation, further according to itself and soil's water content and the related pass of dry density
System, is shown below, you can converse different depth soil's water content and dry density.
W is the moisture content of water in formula；ρdFor filling's dry density；EC is native bulk electrical conductivity；Coefficient a, b, c, d can pass through
Laboratory experiment is measured.
The features such as detector has simple, easy to operate, multi-functional, can rapidly and accurately determine different depth soil under earth's surface
Moisture content and density, for rock-soil engineering in-situ test accurately and effectively multi-functional appraisal tool is provided.
Beneficial effect：The determination problem of native moisture content and dry density parameter is at home in Geotechnical Engineering practice, under earth's surface
Increasingly draw attention.Understand the native information such as moisture content and dry density of different depth under earth's surface, to prevention Geotechnical Engineering accident with
Repair capsule Geotechnical Engineering accident scheme is most important.Traditional investigation method, such as using domain reflectometer technology and indoor examination
Test, comparatively take, acquired results are the parameter of shallow soil and function is single, therefore quickly can not effectively determine this two and refer to
Mark.The present invention is based on existing domain reflectometer technology, it is proposed that a kind of Multifunctional detector, can test containing for different depth water
Water rate, while realizing while the target of the native moisture content of measurement and dry density, solves domestic existing rock-soil engineering in-situ test
The defect of soil's water content and dry density under accurate, continuous, multi-functional test earth's surface that technology is difficult to so that modern in-situ test
Technology can preferably serve Geotechnical Engineering practice.
Brief description of the drawings
Fig. 1 is the panel detector structure schematic diagram of the present invention,
Fig. 2 is the detector central structure schematic diagram of the present invention.
Wherein have：Coaxial cable 1, feeler lever connector 2, water proof ring 3, analog-digital converter 4, transmission line 5, nylon sleeve 6,
Steel core 7, conductivity sensor 8, conehead 9.
Embodiment
The present invention be it is a kind of can the native moisture content of different depth and the detector of dry density under on-the-spot test earth's surface, by coaxial electrical
Cable 1, feeler lever connector 2, water proof ring 3, analog-digital converter 4, transmission line 5, nylon sleeve 6, steel core 7, conductivity sensor 8, cone
First 9 composition.The detector built-in coaxial cable 1, top is that water proof ring 3, waterproof are provided with feeler lever connector 2, feeler lever connector 2
The bottom of circle 3 is analog-digital converter 4, and analog-digital converter 4 is connected with coaxial cable 1, and transmission line 5 is located at the outside of detector,
Two parallel transmission lines 5 are inside set, transmission line 5 is coiled in nylon sleeve in a spiral fashion by epoxy resin adhesive
On 6 outsides, the inside of nylon sleeve 6 is steel core 7, and the bottom of detector is conductivity sensor 8, and conductivity sensor 8 passes through
Coaxial cable 1 is connected with analog-digital converter 4, and conductivity sensor 8 is located inside conehead 9.
The height of feeler lever connector 2 is 70mm, a diameter of 43.7mm.
Two parallel transmission lines 5 are coiled on the outside of nylon sleeve 6 in a spiral fashion, and its spacing is 40mm.
The sectional area of transmission line 5 is 12mm2。
The thickness of nylon sleeve 6 is 7mm.
The height of steel core 7 is 180mm.
The cone angle of conehead 9 is 30 °, and conical base sectional area is 15cm2。
It can be used for the native moisture content of different depth and the detector of dry density under on-the-spot test earth's surface shown in Fig. 1, be to utilize
Then static sounding penetrometer launches frequency electromagnetic waves arteries and veins by under the direct injection earth's surface of Multifunctional detector using impulse sender
Punching, obtains time and attenuation degree that high-frequency electromagnetic wave impulse is propagated in transmission line, and according to the two with soil's water content and
The dependency relation of dry density, converses different depth soil's water content and dry density under earth's surface.The apparent dielectric constant, apparent of soil
Electrical conductivity and soil moisture content, the expression formula of dry density are：
Meanwhile, measuring technology of the invention has to pass through indoor standardization experiment.According to U.S.'s experiment and materialogy meeting
(ASTM) dry the standard of soil to carry out indoor standardization experiment in D2216.The detector has simple, easy to operate, multi-functional
The features such as, different depth soil's water content and dry density under earth's surface can be rapidly and accurately determined, is that rock-soil engineering in-situ test is carried
For accurately and effectively multi-functional appraisal tool.
Claims (6)
1. a kind of can the native moisture content of different depth and the detector of dry density under on-the-spot test earth's surface, it is characterised in that the detector
It is cylindric for one, including coaxial cable (1), feeler lever connector (2), water proof ring (3), analog-digital converter (4), transmission
Line (5), nylon sleeve (6), steel core (7), conductivity sensor (8), conehead (9)；The detector top is feeler lever connector
(2) water proof ring (3), is provided with feeler lever connector (2), the bottom of water proof ring (3) is analog-digital converter (4), analog-digital converter
(4) it is connected with coaxial cable (1), transmission line (5) there are two outsides for being located at detector, by epoxy resin adhesive with spiral shell
The mode of rotation shape is parallel to be coiled on the outside of nylon sleeve (6), and the inside of nylon sleeve (6) is steel core (7), and the bottom of detector is
Conductivity sensor (8), conductivity sensor (8) is connected by coaxial cable (1) with analog-digital converter (4), conehead (9)
Bottom positioned at steel core (7), it is internal that conductivity sensor (8) is located at conehead (9)；
Described two parallel transmission lines (5) are coiled on nylon sleeve (6) outside in a spiral fashion, and its spacing is
40mm。
2. it is according to claim 1 can the native moisture content of different depth and the detector of dry density under on-the-spot test earth's surface, its
The height for being characterised by feeler lever connector (2) is 70mm, a diameter of 43.7mm.
3. it is according to claim 1 can the native moisture content of different depth and the detector of dry density under on-the-spot test earth's surface, its
The sectional area for being characterised by transmission line (5) is 12mm2。
4. it is according to claim 1 can the native moisture content of different depth and the detector of dry density under on-the-spot test earth's surface, its
The thickness for being characterised by nylon sleeve (6) is 7mm.
5. it is according to claim 1 can the native moisture content of different depth and the detector of dry density under on-the-spot test earth's surface, its
The height for being characterised by steel core (7) is 180mm.
6. it is according to claim 1 can the native moisture content of different depth and the detector of dry density under on-the-spot test earth's surface, its
The cone angle for being characterised by conehead (9) is 30 °, and conical base sectional area is 15cm2。
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| CN109060046A (en) * | 2018-10-31 | 2018-12-21 | 山东省烟台市农业科学研究院 | A kind of multilevel soil sensor |
| CN110398517A (en) * | 2019-06-20 | 2019-11-01 | 浙江大学城市学院 | Micro screw-type continuous penetration type TDR probe apparatus in situ |
| CN111122619B (en) * | 2019-12-31 | 2022-02-18 | 青岛海洋地质研究所 | Water content measuring system based on parallel spiral type telescopic time domain reflection probe |
| CN111521519B (en) * | 2020-05-09 | 2021-09-17 | 河海大学 | Probe and method for measuring proportion of cement to soil in saturated soil |
| CN113504270B (en) * | 2021-09-06 | 2021-11-26 | 中南大学 | Cohesive soil water content tester and method based on heating vaporization method |
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