CN105136864A - Detector capable of testing water content and dry density of soil at different depths under earth surface on field - Google Patents

Detector capable of testing water content and dry density of soil at different depths under earth surface on field Download PDF

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CN105136864A
CN105136864A CN201510583197.0A CN201510583197A CN105136864A CN 105136864 A CN105136864 A CN 105136864A CN 201510583197 A CN201510583197 A CN 201510583197A CN 105136864 A CN105136864 A CN 105136864A
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detector
dry density
soil
different depth
analog
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CN105136864B (en
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李学鹏
蔡国军
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Southeast University
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Southeast University
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Abstract

The invention discloses a detector capable of testing water content and dry density of soil at different depths under the earth surface on field, the detector is cylindrical, is internally provided with a coaxial cable (1) and is provided with a probe connector (2) at the upper part, a waterproof ring (3) is arranged in the probe connector (2) and is provided with an analog-digital converter (4) at the lower part, the analog-digital converter (4) is connected with the coaxial cable (1), two transmission lines (5) are positioned outside the detector, and spirally coil outside a nylon sleeve (6) in parallel by an epoxy resin cementing agent, the interior of the nylon sleeve (6) is a steel core (7), the lower part of the detector is a conductivity sensor (8) connected with the analog-digital converter (4) by the coaxial cable (1), a cone head (9) is positioned at the lower part of the steel core (7), and the conductivity sensor (8) is positioned in the cone head (9). The detector has the characteristics of simpleness, easiness in operation and multiple functions, and can fast accurately determine the water content and density of soil at different depths under the earth surface.

Description

Can the detector of different depth soil water percentage and dry density under on-the-spot test earth's surface
Technical field
The present invention relates to a kind of Multifunctional detector, belong in Geotechnical Engineering field a kind of can original position, test the multi-functional static sounding device of different depth soil water percentage and dry density under earth's surface continuously, exactly.
Background technology
In Geotechnical Engineering field, about the research of water percentage native under earth's surface and dry density becomes more and more important.Soil water percentage and density are two important parameters that the Geotechnical Engineerings such as basis, embankment, dam, retaining wall, slope are built.The Strength and Dformation etc. that the mechanical property of soil comprises soil is all closely bound up with soil's water content.The change of soil's water content usually brings a lot of engineering accident, and these accidents all need accurately to grasp soil's water content and dry density.Domestic now relatively ripe conventional Time-domain reflectometry techniques is widely used in be measured among the distortion of native volumetric water content, volume conductance and Rock And Soil.This conventional testing techniques has measures the advantages such as easy, measuring speed is fast, precision is high, data transmission is flexible.But this conventional Time-domain reflectometry techniques can only measure shallow-layer soil's water content under earth's surface, the water percentage of the soil layer that can not fathom, and filling's dry density can not be measured simultaneously, be difficult to meet correlative study and design needs.Therefore under raising test earth's surface, the technical merit of native water percentage seems very necessary.
The present invention is based on traditional measuring technology, propose a kind of can the detector of different depth soil water percentage and dry density under on-the-spot test earth's surface, namely the present invention solves the problem can only testing shallow soil water percentage, achieve the target simultaneously measuring native water percentage and dry density, for rock-soil engineering in-situ test provides appraisal tool accurately and effectively simultaneously.
Summary of the invention
Technical matters: the technical problem to be solved in the present invention is for the single defect of current domestic technique probe functionality, propose a kind of can be used for Geotechnical Engineering field can the detector of different depth soil water percentage and dry density under on-the-spot test earth's surface.
Technical scheme: the present invention be a kind of can the detector of different depth soil water percentage and dry density under on-the-spot test earth's surface, this detector be one cylindric, comprising concentric cable, feeler lever connector, water proof ring, analog-digital converter, transmission line, nylon sleeve, steel core, conductivity sensor, conehead; This detector top is feeler lever connector, water proof ring is provided with in feeler lever connector, the bottom of water proof ring is analog-digital converter, analog-digital converter is connected with concentric cable, transmission line has two outsides being positioned at detector, by epoxy resin adhesive in a spiral fashion parallel discs outside nylon sleeve, the inside of nylon sleeve is steel core, the bottom of detector is conductivity sensor, conductivity sensor is connected with analog-digital converter by concentric cable, conehead is positioned at the bottom of steel core, and conductivity sensor is positioned at conehead inside.
The height of feeler lever connector is 70mm, and diameter is 43.7mm.
Article two, parallel transmission line is coiled on outside nylon sleeve in a spiral fashion, and its spacing is 40mm.
The sectional area of transmission line is 12mm 2.
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 15cm 2.
The detector that can be used for different depth soil water percentage and dry density under on-the-spot test earth's surface of the present invention, utilize static sounding penetrometer by detector with under the direct injection earth's surface of the speed of 1.2m/min, then impulse sender is utilized to launch high-frequency electromagnetic wave impulse, the speed dependent that high-frequency electromagnetic wave impulse is propagated along transmission line in soil, in the specific inductive capacity of soil, is shown below:
K = ( c v ) 2 = ( c t 2 L ) 2
In formula, K is the apparent dielectric constant of soil; C is the light velocity (3*10 8m/s); V is velocity of propagation; L is detector length; T is the time of pulse propagation.
Specific inductive capacity mainly affects by native water percentage, according to the frequency electromagnetic waves specific inductive capacity that is unearthed of frequencies of propagation or Time Calculation in media as well.When cable tester is got back in the signal reflex of high-frequency electromagnetic wave impulse, the damping capacity of reflected signal can be grasped, and the damping capacity of reflected signal is relevant to the conductivity of soil, namely by conductivity that the damping capacity of reflected signal must be unearthed.The specific inductive capacity obtained by measuring and calculation and attenuation degree, then according to the correlationship of itself and soil's water content and dry density, be shown below, different depth soil's water content and dry density can be conversed.
K ρ w ρ d = a + b w
E C ρ w ρ d = c + d w
In formula, w is the water percentage of water; ρ dfor filling's dry density; EC is the bulk electrical conductivity of soil; Coefficient a, b, c, d record by laboratory experiment.
This detector has the features such as simple, easy to operate, multi-functional, can determine different depth soil's water content and density under earth's surface rapidly and accurately, for rock-soil engineering in-situ test provides multi-functional appraisal tool accurately and effectively.
Beneficial effect: in Geotechnical Engineering practice, under earth's surface, the problem identificatioin of native water percentage and dry density parameter draws attention at home day by day.Understand information such as different depth soil water percentage and dry density etc. under earth's surface, to prevention Geotechnical Engineering accident and repair capsule Geotechnical Engineering accident scheme most important.Traditional investigation method, as adopted domain reflectometer technology and shop experiment, comparatively consuming time, acquired results is the parameter of shallow soil and function singleness, therefore effectively cannot determine these two indexs fast.The present invention is based on existing domain reflectometer technology, propose a kind of Multifunctional detector, the water percentage of different depth water can be tested, achieve the target simultaneously measuring native water percentage and dry density simultaneously, solve the defect that domestic existing rock-soil engineering in-situ measuring technology is difficult to soil's water content and dry density under accurate, continuous, multi-functional test earth's surface, make modern in-situ testing technique better can serve Geotechnical Engineering practice.
Accompanying drawing explanation
Fig. 1 is panel detector structure schematic diagram of the present invention,
Fig. 2 is detector central structure schematic diagram of the present invention.
Wherein have: concentric 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 a kind of can the detector of different depth soil water percentage and dry density under on-the-spot test earth's surface, be made up of concentric 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.This detector built-in coaxial cable 1, top is feeler lever connector 2, water proof ring 3 is provided with in feeler lever connector 2, the bottom of water proof ring 3 is analog-digital converter 4, analog-digital converter 4 is connected with concentric cable 1, transmission line 5 is positioned at the outside of detector, inside establish the transmission line 5 that two parallel, transmission line 5 is coiled on outside nylon sleeve 6 in a spiral fashion by epoxy resin adhesive, the inside of nylon sleeve 6 is steel core 7, the bottom of detector is conductivity sensor 8, conductivity sensor 8 is connected with analog-digital converter 4 by concentric cable 1, it is inner that conductivity sensor 8 is positioned at conehead 9.
The height of feeler lever connector 2 is 70mm, and diameter is 43.7mm.
Article two, parallel transmission line 5 is coiled on outside nylon sleeve 6 in a spiral fashion, and its spacing is 40mm.
The sectional area of transmission line 5 is 12mm 2.
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 15cm 2.
The detector that can be used for different depth soil water percentage and dry density under on-the-spot test earth's surface shown in Fig. 1, utilize static sounding penetrometer by under direct for Multifunctional detector injection earth's surface, then impulse sender is utilized to launch high-frequency electromagnetic wave impulse, obtain high-frequency electromagnetic wave impulse at the time that transmission line is propagated and attenuation degree, and according to the correlationship of the two and soil's water content and dry density, converse different depth soil's water content and dry density under earth's surface.The expression formula of native apparent dielectric constant, bulk electrical conductivity and native water percentage, dry density is:
w = c K - a E C b E C - d K
ρ d = d K - b E C a d - c b
Meanwhile, measuring technology of the present invention has to pass through indoor standardization test.Indoor standardization test is carried out with the standard of the oven-dried soil in materialogy meeting (ASTM) D2216 according to U.S.'s test.This detector has the features such as simple, easy to operate, multi-functional, can determine different depth soil's water content and dry density under earth's surface rapidly and accurately, for rock-soil engineering in-situ test provides multi-functional appraisal tool accurately and effectively.

Claims (7)

1. one kind can the detector of different depth soil water percentage and dry density under on-the-spot test earth's surface, it is characterized in that this detector be one cylindric, comprising concentric 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), this detector top is feeler lever connector (2), water proof ring (3) is provided with in feeler lever connector (2), the bottom of water proof ring (3) is analog-digital converter (4), analog-digital converter (4) is connected with concentric cable (1), transmission line (5) has two outsides being positioned at detector, by epoxy resin adhesive in a spiral fashion parallel discs around nylon sleeve (6) outside, the inside of nylon sleeve (6) is steel core (7), the bottom of detector is conductivity sensor (8), conductivity sensor (8) is connected with analog-digital converter (4) by concentric cable (1), conehead (9) is positioned at the bottom of steel core (7), it is inner that conductivity sensor (8) is positioned at conehead (9).
2. according to claim 1 can the detector of different depth soil water percentage and dry density under on-the-spot test earth's surface, it is characterized in that the height of feeler lever connector (2) is 70mm, diameter is 43.7mm.
3. according to claim 1 can the detector of different depth soil water percentage and dry density under on-the-spot test earth's surface, it is characterized in that described two parallel transmission lines (5) are coiled on nylon sleeve (6) outside in a spiral fashion, its spacing is 40mm.
4. according to claim 1 can the detector of different depth soil water percentage and dry density under on-the-spot test earth's surface, it is characterized in that the sectional area of transmission line (5) is 12mm 2.
5. according to claim 1 can the detector of different depth soil water percentage and dry density under on-the-spot test earth's surface, it is characterized in that the thickness of nylon sleeve (6) is 7mm.
6. according to claim 1 can the detector of different depth soil water percentage and dry density under on-the-spot test earth's surface, it is characterized in that the height of steel core (7) is 180mm.
7. according to claim 1 can the detector of different depth soil water percentage and dry density under on-the-spot test earth's surface, it is characterized in that the cone angle of conehead (9) is 30 °, conical base sectional area is 15cm 2.
CN201510583197.0A 2015-09-14 2015-09-14 Can the native moisture content of different depth and the detector of dry density under on-the-spot test earth's surface Active CN105136864B (en)

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CN108935014A (en) * 2018-08-07 2018-12-07 河北省林业科学研究院 Trees to maintain equipment
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
CN111122619A (en) * 2019-12-31 2020-05-08 青岛海洋地质研究所 Water content measuring system based on parallel spiral type telescopic time domain reflection probe
CN111521519A (en) * 2020-05-09 2020-08-11 河海大学 Probe and method for measuring proportion of cement to soil in saturated soil
CN113504270A (en) * 2021-09-06 2021-10-15 中南大学 Cohesive soil water content tester and method based on heating vaporization method

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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
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CN111521519A (en) * 2020-05-09 2020-08-11 河海大学 Probe and method for measuring proportion of cement to soil in saturated soil
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
CN113504270A (en) * 2021-09-06 2021-10-15 中南大学 Cohesive soil water content tester and method based on heating vaporization method
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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