Device for evaluating characteristics of target ground containing metal component

Patent metadata

Field	Value
Publication number	US-11977199-B2
Application number	US-202017289305-A
Country	US
Kind code	B2
Filing date	Oct 26, 2020
Priority date	Nov 5, 2019
Publication date	May 7, 2024
Grant date	May 7, 2024

Abstract

A device for evaluating characteristics of a target ground containing a metal component is proposed. The device includes a penetration probe having a main frame and a pair of side frames respectively installed at opposite side ends of the main frame, wherein each side frame has a lower end thereof extending downward from the main frame; a plurality of electrodes installed to be exposed to outside on the main frame; an electrode measurement part for measuring apparent chargeability of the target ground by applying power for measurement to the plurality of electrodes; and a main processor for calculating a weight ratio of a metal component of the target ground on the basis of the apparent chargeability measured by the electrode measurement part and calculating a volume ratio of the metal component of the target ground on the basis of the calculated weight ratio of the metal component.

First claim

The invention claimed is:

1. A device for evaluating characteristics of a target ground containing a metal component, the device comprising:
a penetration probe having a main frame and a pair of side frames respectively installed at opposite side ends of the main frame, wherein each side frame has a lower end thereof extending downward from the main frame;
four electrodes installed on the main frame and exposed to outside on the main frame;
an electrode measurement part for measuring apparent chargeability of the target ground; and
a main processor for calculating a weight ratio of the metal component of the target ground on the basis of the apparent chargeability measured by the electrode measurement part and calculating a volume ratio of the metal component of the target ground on the basis of the calculated weight ratio of the metal component,
wherein the electrode measurement part applies power for measurement to two electrodes among the four electrodes, and detects voltage between the other two electrodes, and then measures the apparent chargeability through a time domain induced polarization probe method using the detected voltage,
wherein the weight ratio of the metal component is subjected to a type of the metal component, so as to be proportional to the apparent chargeability, and
wherein the volume ratio of the metal component is calculated based on the weight ratio of the metal component, specific gravity of the metal component, and specific gravity of a soil component of the target ground.

2. The device of claim 1 , wherein the main processor calculates the weight ratio of the metal component through Equation m=k·IC (where, m is the apparent chargeability, IC is the weight ratio of the metal component, and k is a constant that varies depending on the type of the metal component), and calculates the volume ratio of the metal component through Equation

f
=

1

1
+

(

1
IC

-
1

)

⁢

G
I

G
S

(where, f is the volume ratio of the metal component, G I is specific gravity of the metal component, and G S is specific gravity of the soil component).

3. The device of claim 1 , further comprising:
a plurality of TDR probes installed to be exposed to the outside on the main frame; and
a TDR measurement part for measuring a relative permittivity of the target ground through the time domain reflectometry (TDR) technique using the plurality of TDR probes,
wherein the main processor calculates a volumetric water content of the target ground on the basis of the relative permittivity.

4. The device of claim 3 , wherein the main processor calculates the volumetric water content through Equation θ v =a+bε r +c(ε r ) 2 +d(ε r ) 3 (where, θ v is the volumetric water content, ε r is the relative permittivity, and constants a, b, c, and d are dependent on the weight ratio of the metal component).

5. The device of claim 4 , wherein the main processor calculates porosity of the target ground through Equation θ v =nS (where, n is the porosity, and S is a degree of saturation of the target ground).

6. The device of claim 4 , wherein the main processor calculates a gravimetric water content through Equation

θ
v

=

ω
⁢

γ
dry

γ
w

(where, ω is the gravimetric water content of the target ground, γ dry is a unit weight of a dry soil component, and γ w is a unit weight of a water component).

7. The device of claim 1 , further comprising:
a compressional wave transmitting transducer installed on any one side of the pair of side frames and transmitting a compressional wave to the target ground;
a compressional wave receiving transducer installed on the other side of the pair of side frames and receiving the compressional wave transmitted from the compressional wave transmitting transducer;
a shear wave transmitting transducer installed on any one side of the pair of side frames and transmitting a shear wave to the target ground;
a shear wave receiving transducer installed on the other side of the pair of side frames and receiving the shear wave transmitted from the shear wave transmitting transducer; and
an elastic wave speed measurement part for measuring speed of the compressional wave and speed of the shear wave, which are propagating through the target ground, by using the compressional wave and the shear wave, which are respectively supplied by the compressional wave transmitting transducer and the shear wave transmitting transducer, and respectively received by the compressional wave receiving transducer and the shear wave receiving transducer,
wherein the main processor calculates porosity of the target ground in which a soil component, the metal component, and a water component are reflected, on the basis of the speed of the compressional wave, the speed of the shear wave, and the volume ratio of the metal component.

8. The device of claim 7 , wherein the main processor calculates the porosity through Equation

n
=

B

g
-
IS

2

⁢

B
f

-

B
sk

⁢

B
f

⁢

B

g
-
IS

-

B
f

⁢

B

g
-
IS

⁢

B
mix

+

B

Assignees

• Univ Korea Res & Bus Found

Inventors

• Lee Jong-Sub
• Kim Sang-Yeob
• Kim Nam-Sun
• Chun Joon-Ki

Classifications

• G01V11/002 Primary

  Details, e.g. power supply systems for logging instruments, transmitting or recording data, specially adapted for well logging, also if the prospecting method is irrelevant (means for transmitting well survey signals E21B47/12; signal transmission systems in general G08C; transmission in general H04B) · CPC title

• G01V1/284

  Application of the shear wave component and/or several components of the seismic signal · CPC title

• G01V1/303

  for determining velocity profiles or travel times · CPC title

• G01V1/306

  for determining physical properties of the subsurface, e.g. impedance, porosity or attenuation profiles · CPC title

• G01V2210/62

  Physical property of subsurface · CPC title