KR20170105679A - Dynamic cone penetrometer system for measurement of ground shear wave velocity and method of test using the same - Google Patents

Dynamic cone penetrometer system for measurement of ground shear wave velocity and method of test using the same Download PDF

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KR20170105679A
KR20170105679A KR1020160028197A KR20160028197A KR20170105679A KR 20170105679 A KR20170105679 A KR 20170105679A KR 1020160028197 A KR1020160028197 A KR 1020160028197A KR 20160028197 A KR20160028197 A KR 20160028197A KR 20170105679 A KR20170105679 A KR 20170105679A
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receiving
dynamic
guide
originating
hammer
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KR101787512B1 (en
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최찬용
김현기
여인호
이종섭
홍원택
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한국철도기술연구원
고려대학교 산학협력단
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D1/00—Investigation of foundation soil in situ
    • E02D1/02—Investigation of foundation soil in situ before construction work
    • E02D1/022—Investigation of foundation soil in situ before construction work by investigating mechanical properties of the soil
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H5/00—Measuring propagation velocity of ultrasonic, sonic or infrasonic waves, e.g. of pressure waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/04—Analysing solids
    • G01N29/045—Analysing solids by imparting shocks to the workpiece and detecting the vibrations or the acoustic waves caused by the shocks
    • G01N29/046—Analysing solids by imparting shocks to the workpiece and detecting the vibrations or the acoustic waves caused by the shocks using the echo of particles imparting on a surface; using acoustic emission of particles
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/02—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with propagation of electric current

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Abstract

The present invention provides a dynamic cone penetrometer system to obtain ground shear wave velocity which operates a shear wave velocity using an acceleration signal transmitted from an originating accelerometer to a receiving accelerometer; and a test method using the same. The present invention dynamically penetrates an originating dynamic cone penetrometer after dynamically penetrating a receiving dynamic cone penetrator into a target ground while the receiving dynamic cone penetrator and the originating dynamic cone penetrator are positioned parallel to each other.

Description

TECHNICAL FIELD [0001] The present invention relates to a dynamic cone tuning system for obtaining a ground shear wave velocity and a test method using the same. [0002]

The present invention relates to a dynamic conical tuning system for obtaining a ground shear wave velocity and a test method using the dynamic conical tuning system. More particularly, the present invention relates to a dynamic cone tuning system for acquiring a shear wave velocity using an acceleration signal generated in a dynamic penetration of a pair of dynamic cone- And to a test method using the same.

Dynamic Cone Penetration Test is a miniaturized in-situ penetration test method for evaluating the condition of compacted soil. Direct penetration is performed on the target soil. Test method is very simple and economical. It is easy to use and is not disturbed to the target ground. The dynamic cone penetration index obtained from the dynamic cone penetration test is a value obtained by applying a permanent deformation to the ground. It can be used to evaluate the strength of the ground, but there is a limit to the stiffness evaluation.

The elastic settlement and vibration due to the external load in the ground where the permanent settlement does not occur is mainly affected by the shear stiffness coefficient of the relevant ground. The shear modulus (G) in the large deformation shows a nonlinear behavior in the load - displacement relation, and the behavior characteristics can be judged by the laboratory test. On the other hand, the shear modulus (Gmax) in the small deformation shows a very good linear relationship in the load - displacement relation, which can be used as a vibration analysis model in the ground. The shear modulus Gmax in the small deformation is closely related to the shear wave velocity at the corresponding ground as shown in Equation 1 below.

Figure pat00001

Here, Gmax denotes a shear modulus in a small deformation,

Figure pat00002
And V s denote the density and shear wave velocity of the target soil, respectively. Therefore, the estimation of the shear wave velocity according to the depth of the target ground can be useful for determining the stiffness characteristics of the ground.

Conventional seismic cone penetration test (SCPT) has been used as a ground survey method for obtaining the conventional shear wave velocity. However, since the method needs to be accompanied by intensive equipment that occupies a large weight and volume, There is a limit to the application to the road or railway being underway, and there is a possibility that the ground to be surveyed is largely disturbed due to the large diameter of the test hole and the penetration rod to be drilled.

1 is a view showing a dynamic cone penetrator according to a conventional technique.

1, a conventional dynamic conical pipe 10 includes a handle 11, a hammer 12, an anvil 13, a steel pipe rod 14, and a cone 15, as shown in Fig.

The dynamic cone penetration test using the dynamic cone drilling machine 10 is easy to maintain and store the equipment, and is a method widely used for obtaining the strength of the target ground in, for example, the United States Roads Bureau. However, such a dynamic cone penetration test is only capable of acquiring the strength characteristics of the target ground, and it is difficult to acquire other characteristics of the target ground such as electrical characteristics.

Also, the dynamic cone penetration index (DCPI) obtained through dynamic cone penetration test is a depth of penetration when the dynamic cone penetrator is struck once and is strongly related to the strength characteristics of the target ground. It is useful to evaluate the strength characteristics of the target soil, but it is an index obtained by applying deformation exceeding the elastic range, so there is a limit to the evaluation of the stiffness characteristics.

Korean Patent No. 10-1094369 filed on Sep. 15, 2009, entitled "Cone Penetration Tester for Ground Impedance Measurement" U.S. Patent No. 5,313,825, issued May 8, 1992, entitled "Dual mass dynamic cone penetrometer" US Patent Publication No. 2012-4848 (published on Jan. 5, 2012), entitled " Device And Methods Of Use Of A Dynamic Cone Penetrometer For Evaluating Soil Compaction " Korean Patent Publication No. 2014-128720 (Publication date: November 6, 2014), entitled " Measurement system using dynamic cone penetrator " Korean Patent Laid-Open No. 2011-54573 (Publication date: May 25, 2011), title of invention: "Ground test device for both cone penetration test and vane shear test"

In order to solve the above-mentioned problems, a technical object of the present invention is to provide a dynamic dynamic control system for a dynamic dynamic control system in which a receiving dynamic cone penetrator and an outgoing dynamic cone penetrator are positioned parallel to each other, The present invention is to provide a dynamic conical tuning system for acquiring a ground shear wave velocity that is used to calculate a shear wave velocity using an acceleration signal transmitted from an originating accelerometer to a receiving accelerometer while dynamically introducing a dynamic cone penetrator after intrusion.

According to an aspect of the present invention, there is provided a dynamic crowning system for obtaining a ground shear wave velocity, comprising: a guide device mounted on a surface of a target ground; A receiving dynamic conical pipe passing through the guide device and dynamically penetrated into the target ground by a predetermined depth; A dynamic dynamic conduit spaced apart from the receiving dynamic cone penetrator and passing through the guide device 200 and being dynamically intruded into the target ground by a predetermined depth; A data logger for recording an originating signal and an acceleration signal transmitted from the receiving dynamic conning device and the originating dynamic conning device; And a computer for outputting the origination signal and the acceleration signal recorded in the data logger, wherein the guide device fixes the incoming dynamic cone penetrator and the outgoing dynamic cone penetrator.

Here, the guide device includes: a base portion having a cubic shape having a cubic shape and having a shape adjacent to a second base plate, the base plate being mounted on the surface of the target base; A horizontal guide part extending upward from the base part and including a receiving guide bar and a guide rod parallel to each other; A vertical guide portion arranged to be vertical while connecting the first base plate and the second base plate; And a hammer guide portion extending from the first base plate and the second base plate and extending to the base portion, wherein the receiving dynamic cone penetrator is inserted into the receiving guide rod, And the originating dynamic cone penetrator is inserted into the transmission guide rod and is dynamically introduced into the target ground.

Here, the vertical guide portion may include an upper guide bar disposed to be perpendicular to the transmission guide bar and the reception guide bar; An upper guide connecting tube connected to both ends of the upper guide bar and inserted and fixed while being in contact with the outer circumferential surfaces of the sending guide rod and the receiving guide rod; A lower guide bar positioned below the upper guide bar and arranged to be perpendicular to the transmission guide bar and the reception guide bar; And a lower guide connecting pipe connected to both ends of the lower guide bar and inserted and fixed while being in contact with the outer circumferential surfaces of the sending guide rod and the receiving guide rod.

The hammer guide portion includes a transmission hammer supporting member surrounding the upper end of the transmission guide bar and a transmission support extending radially from the outer circumferential surface of the transmission hammer supporting member toward the respective vertexes of the first base plate, guide; And a reception support arm extending from the outer circumferential surface of the receiving hammer supporting member and the receiving hammer supporting member surrounding the upper end of the receiving guide rod to each of the vertexes of the second base plate so as to extend radially, .

Here, the receiving dynamic cone penetrator may include: a receiving drop hammer that falls at a predetermined height to load impact energy; A receiving hammer guide for guiding the movement of the receiving drop hammer; A receiving anvil for transmitting the impact energy transmitted from the receiving drop hammer; A receiving intrusion rod extending longitudinally from the receiving anvil and inserted into the receiving guide rod; And a receiving tip cone connected to an end of the receiving intrusion rod and having a receiving accelerometer for measuring the acceleration signal.

Here, the originating dynamic cone penetrator may include: an originating drop hammer which falls at a predetermined height to load impact energy; An originating hammer guide for guiding movement of the originating drop hammer; An originating anvil for delivering the impact energy delivered from the originating drop hammer; A transmission intrusion rod extending longitudinally from the transmission anvil and inserted into the transmission guide rod; And an originating distal cone connected to an end of the transmitting intrusion rod and having an originating accelerometer for transmitting the acceleration signal to the receiving accelerometer, and acquiring the shear wave velocity using the acceleration signal.

Here, the shear wave velocity (

Figure pat00003
),
Figure pat00004
(here,
Figure pat00005
The distance between the outgoing dynamic cone penetration and the received dynamic cone penetration,
Figure pat00006
= Time taken until the acceleration signal generated by the originating accelerometer is received by the receiving accelerometer when the originating drop hammer is dynamically struck).

According to another aspect of the present invention, there is provided a test method using a dynamic crowning system for obtaining a ground shear wave velocity, comprising: (a) placing a guide device on a surface of a target ground; (b) inserting and placing a receiving dynamic cone penetrator and an outgoing dynamic cone penetrator into the guide device so as to be parallel to and perpendicular to the surface of the target ground; (c) dynamic dynamic penetration of the receiving dynamic cone penetrator by a predetermined depth into the target ground; And (d) dynamically introducing the dynamic dynamic cone penetrator into the target ground by a predetermined depth, wherein a shear wave velocity is obtained using the acceleration signal generated in the step (d).

Here, in the step (a), the guide device may include: a base portion having a cubic shape having a cubic shape and having a shape adjacent to a first base plate and a second base plate, the base plate being mounted on a surface of the target base; A horizontal guide part extending upward from the base part and including a receiving guide bar and a guide rod parallel to each other; A vertical guide portion arranged to be vertical while connecting the first base plate and the second base plate; And a hammer guide portion extending from the first base plate and the second base plate and extending to the base portion.

Here, in the step (b), the receiving dynamic cone penetrator may include: a receiving drop hammer dropping at a predetermined height to load impact energy; A receiving hammer guide for guiding the movement of the receiving drop hammer; A receiving anvil for transmitting the impact energy transmitted from the receiving drop hammer; A receiving intrusion rod extending longitudinally from the receiving anvil and inserted into the receiving guide rod; And a receiving tip cone connected to an end of the receiving intrusion rod and having a receiving accelerometer for measuring the acceleration signal.

Here, in the step (b), the originating dynamic cone penetrator may include: an originating drop hammer that falls at a predetermined height to load impact energy; An originating hammer guide for guiding movement of the originating drop hammer; An originating anvil for delivering the impact energy delivered from the originating drop hammer; A transmission intrusion rod extending longitudinally from the transmission anvil and inserted into the transmission guide rod; And an originating distal cone connected to an end of the transmitting intrusion rod and having an originating accelerometer for transmitting the acceleration signal to the receiving accelerometer.

Here, the shear wave velocity (

Figure pat00007
),
Figure pat00008
(here,
Figure pat00009
The distance between the outgoing dynamic cone penetration and the received dynamic cone penetration,
Figure pat00010
= Time taken until the acceleration signal generated by the originating accelerometer is received by the receiving accelerometer when the originating drop hammer is dynamically struck).

The step (c) includes the steps of: (c1) repeatedly performing vertical reciprocating motion of the receiving drop hammer dynamically hitting the receiving anvil so as to uniformly penetrate the receiving intruder rod into the target ground; And (c2) terminating the dynamic striking by the receiving drop hammer after the lower end of the receiving end cone reaches the predetermined depth.

The step (d) includes the steps of: (d1) repeatedly performing a vertical reciprocating movement of the origination drop hammer dynamically hitting the origination anvil, thereby penetrating the origination intrusion rod to the target ground; And (d2) terminating the dynamic striking by the originating drop hammer after the lower end of the originating distal cone reaches the predetermined depth.

According to the present invention, a dynamic dynamic cone penetrator is dynamically intruded into a target ground while a receiving dynamic cone penetrator and an outgoing dynamic cone penetrator are placed parallel to each other with a guide device mounted on a target ground, It is useful to determine the stiffness characteristics of the target ground by calculating the shear wave velocity using the acceleration signal transmitted from the originating accelerometer to the receiving accelerometer.

1 is a view showing a dynamic cone penetrator according to a conventional technique.
FIG. 2 is a diagram illustrating a source dynamic crowning, a receive dynamic crowning, a data loader, and a computer in a dynamic crowning system for obtaining a ground shear wave velocity according to an embodiment of the present invention.
3 is a view showing a guide device of a dynamic conical tunneling system for obtaining a ground shear wave velocity according to an embodiment of the present invention.
FIGS. 4A, 4B, 4C and 4D sequentially show test methods using a dynamic conical tuning system for obtaining a ground shear wave velocity according to an embodiment of the present invention.
FIG. 5 is a graph of normalized acceleration versus time obtained from the dynamic cone penetrator of the dynamic cone drilling system for obtaining the ground shear wave velocity according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

[Dynamic Conduit Welding System for Ground Shear Wave Velocity Acquisition]

FIG. 2 is a diagram showing a source dynamic cone tuning device, a receiving dynamic cone tuning device, a data logger, and a computer in a dynamic cone tuning system for obtaining a ground shear wave velocity according to an embodiment of the present invention. FIG. Fig. 3 is a view showing a guiding device of a dynamic conical tunneling system for obtaining a ground shear wave velocity according to the present invention;

A dynamic conical tuning system for obtaining a ground shear wave velocity according to an embodiment of the present invention includes a device capable of obtaining a shear wave velocity using an acceleration signal between a pair of dynamic conical tuners 100 and 100 ' A receiving dynamic canonical guiding unit 100 which is dynamically penetrated by a predetermined depth into a target ground while passing through a guide device 200 which is placed on a surface of a target ground, A dynamic dynamic conical pipe 100 ', a dynamic dynamic conical pipe 100 and a dynamic dynamic conical pipe 100', which are passed through the guide device 200 and dynamically penetrated by a predetermined depth into the target ground, A data logger 410 for recording the acceleration signal and a computer 420 for outputting the origin signal and the acceleration signal recorded in the data logger 410.

[Receive Dynamic Conduit Apparatus (100)]

The receiving dynamic crowning machine 100 includes a receiving drop hammer 110 dropping at a predetermined height to load impact energy, a receiving hammer guide 120 guiding the movement of the receiving drop hammer 110, a receiving drop hammer 110, A receiving intruder rod 150 extending in the longitudinal direction from the receiving anvil 140 and inserted into the receiving guide rod 221 and a receiving intruder rod 150 extending from the receiving anvil 140, And a receiving tip cone 160 connected to an end of the receiving tip and having a receiving accelerometer 173 for measuring an acceleration signal.

The reception drop hammers 110 drop down at a predetermined height and transmit a constant energy to the distal end cone to thereby dynamically introduce the received dynamic cone drilling machine 100 into the target ground.

The receiving hammer guide 120 serves to guide the movement of the receiving drop hammer 110.

The reception anvil 140 and the reception cushion 130 serve to deliver the impact energy from the reception drop hammer 110 to the intruder. That is, the reception anvil 140 transmits the impact energy loaded from the reception drop hammer 110, and the reception cushion 130 functions to absorb impact energy to protect the reception dynamic conical tube 100.

The receive intrusion rod 150 extends longitudinally from the receive anvil 140.

The receiving end cone 160 is connected to the end of the receiving intrusion rod 150 and is provided with a receiving accelerometer 173 for receiving the acceleration signal.

The receiving dynamic conical tube 100 is intruded and measured in a state where it is supported by a predetermined support, and specifically, prepares for the strength of the ground and the intrusion of the dynamic conical tube 100, 110, and the number of strokes and the amount of penetration of the receiving drop hammer 110 are measured. Next, the electrical resistivity and temperature are measured at a predetermined depth of the target ground, and then the above-described steps are repeatedly performed by moving the reception drop hammer 110 up and down again.

That is, the receiving dynamic conical pipe 100 causes dynamic penetration of the entire pipe due to constant energy transfer from the receiving drop hammer 110, and the amount of dynamic penetration into the target ground is calculated as DCPI (mm / blow) The strength characteristics of the ground can be grasped.

That is, the receiving dynamic conical pipe 100 according to the present invention applies the impact load at a constant potential energy of the receiving drop hammer 110 to the target ground where ground survey is required, Strength characteristics can be obtained.

The receiving end cone 160 is made of a metal material and includes a receiving cone tip 161 and a receiving cone body 162. The receiving cone tip 161 and the receiving cone body 162 are made of metal.

The receiving cone tip 161 is conically formed at the lower end of the receiving tip cone 160 and penetrated into the target ground.

[Outgoing Dynamic Conduit (100 ')]

The originating dynamic cone constructing apparatus 100 'includes a transmission drop hammer 110' dropping at a preset height to load impact energy, a transmission hammer guide 120 'guiding the movement of the originating drop hammer 110' A transmitting anvil 140 'that extends in the longitudinal direction from the transmitting anvil 140' and is inserted into the inside of the transmitting guide rod 222, a transmitting anvil 140 'that transmits impact energy transmitted from the drop hammer 110' And an originating tip cone 160 'connected to an end of the transmitting intrusion rod 150' and having a source accelerometer 173 'for transmitting an acceleration signal to the receiving accelerometer 173.

Since the configuration of the dynamic dynamic concealment apparatus 100 'is substantially the same as that of the dynamic dynamic concealment apparatus 100 described above, a detailed description thereof will be omitted, but the difference between the functions of the reception accelerometer 173 and the origin accelerometer 173' And related matters will be described later in detail.

[Guide Device (200)]

The guide device 200 includes a base portion 210 having a cube-shaped first base plate 211 and a second base plate 212 which are adjacent to each other and are mounted on the surface of the target base, The first base plate 211 and the second base 211 which extend upward from the first base plate 210 and are spaced apart from each other and which include a parallel reception guide bar 221 and a transmission guide bar 222, A vertical guide portion 230 arranged to vertically connect the plate 212 and a hammer guide portion 230 extending from the base portion 210 to surround the upper ends of the first base plate 211 and the second base plate 212, (240).

The guide device 200 serves to fix the receiving dynamic conical tube 100 and the outgoing dynamic conical tube 100 '.

More specifically, the vertical guide portion 230 includes an upper guide bar 231 arranged to be perpendicular to the transmission guide bar 221 and the reception guide bar 222, and a lower guide bar 231 connected to both ends of the upper guide bar 231, An upper guide connecting pipe 232 which is inserted and fixed while being in contact with the outer circumferential surface of the receiving guide bar 222 and a transmitting guide bar 221 and a receiving guide bar 222 which are positioned below the upper guide bar 231, And a lower guide connecting pipe 234 which is connected to both ends of the lower guide bar 233 and is inserted and fixed while being in contact with the outer circumferential surfaces of the transmitting guide bar 221 and the receiving guide bar 222 ).

The hammer guide unit 240 is provided with an outgoing hammer support member 241a surrounding the upper end of the transmission guide bar 221 and an outer circumferential surface of the outgoing hammer support member 241a toward each of the vertexes of the first base plate 211 The receiving hammer support member 242a and the receiving hammer supporting member 242a surrounding the upper ends of the receiving guide bar 222 and the receiving hammer guide 241 including the sending support rods 241b extending radially extend from the outer peripheral surface of the receiving hammer supporting member 242a And a receiving hammer guide 242 including a receiving support 242b extending radially toward each vertex of the base plate 212. [

Thus, the receiving dynamic conical tube 100 described above is inserted into the receiving guide rod 222 and is dynamically introduced into the target ground, and the transmitting dynamic conical tube 100 'is inserted into the transmitting guide rod 221 It is dynamically penetrated into the target ground.

[Test Method Using Dynamic Conduit Welding System for Ground Shear Wave Velocity Acquisition]

FIGS. 4A, 4B, 4C, and 4D are views sequentially illustrating a test method using a dynamic conical tuning system for obtaining a ground shear wave velocity according to an embodiment of the present invention. FIG. This is a normalized acceleration-time graph obtained from the dynamic cone penetrator of the dynamic cone tuning system for ground shear wave velocity acquisition.

A test method using a dynamic conical tuning system for obtaining a ground shear wave velocity according to an embodiment of the present invention includes the steps of (a) placing a guide device 200 on a surface of a target ground, (b) Inserting and placing the receiving dynamic conical tuning device 100 and the outgoing dynamic conner tuning device 100 'in the guide device 200 so that the received dynamic conical tuning device 100 and the receiving dynamic conical tuning device 100 are parallel to each other, (c) (D) dynamic dynamic cone penetration (100 ') dynamic penetration by a predetermined depth into the target ground, wherein the shear wave velocity is calculated using the acceleration signal generated in step (d) .

At this time, in the step (a), the guide device 200 includes a first base plate 211 and a second base plate 212 in the form of cubes having the same size, which are adjacent to each other, A horizontal guide part 220 extending upward from the base part 210 and including a parallel reception guide bar 221 and a transmission guide bar 222 in a spaced apart relationship, A vertical guide unit 230 arranged to vertically connect the base plate 211 and the second base plate 212 and a vertical guide unit 230 surrounding the upper ends of the first base plate 211 and the second base plate 212, And a hammer guide unit 240 extending from the hammer guide unit 210.

In the step (b), the receiving dynamic conical tube 100 includes a receiving drop hammer 110 for dropping the impact energy at a predetermined height, a reception hammer 110 for guiding the movement of the receiving drop hammer 110, A receiving anvil 140 extending in the longitudinal direction from the receiving anvil 140 and inserted into the receiving guide rod 221; And a receiving tip cone 160 connected to an end of the receiving intrusion rod 150 and having a receiving accelerometer 173 for measuring an acceleration signal.

In addition, in the step (b), the outgoing dynamic conical tube 100 'guides the movement of the originating drop hammer 110' and the originating drop hammer 110 ', which drop at a predetermined height to load impact energy A transmission anchor 140 'extending in the longitudinal direction from the transmission anvil 140' and transmitting the impact energy transmitted from the transmission drop hammer 110 ' And an originating accelerator 173 'connected to an end of the transmitting intrusion rod 150' and the transmitting intrusion rod 150 'inserted into the receiving introductory rod 150' and having an originating accelerometer 173 'for transmitting an acceleration signal to the receiving accelerometer 173 ').

Here, the shear wave velocity (

Figure pat00011
) Is calculated by the following equation (2).

Figure pat00012

(here,

Figure pat00013
The distance between the outgoing dynamic cone penetration and the received dynamic cone penetration,

Figure pat00014
= Time until the acceleration signal generated by the originating accelerometer is received by the receiving accelerometer if the originating drop hammer is dynamically struck)

(C) repeating the vertical reciprocating motion of the receiving drop hammer 110 dynamically hitting the receiving anvil 140 so as to penetrate the receiving intrusion rod 150 into the target ground, and c2) terminating the dynamic hit by the receiving drop hammer 110 after reaching the lower end of the receiving tip cone 160 to a predetermined depth.

Next, the step (d) includes the steps of: (d1) repeatedly vertically reciprocating the origination drop hammer 110 'dynamically hitting the origination anvil 140' so that the outgoing input rod 150 ' And (d2) terminating the dynamic striking by the originating drop hammer 110 'after reaching a predetermined depth to the lower end of the originating distal cone 160'.

More specifically, when performing the step (d) in the state of FIG. 4C, when the originating drop hammer 110 'descends and dynamically hits the transmission anvil 140', the transmission intrusion rod 150 ' Dynamic. At this time, the originating accelerometer 173 'transmits an acceleration signal, and accordingly, the receiving accelerometer 173 receives the acceleration signal.

When the lower end of the transmitting distal end cone 160 'is dynamically penetrated to a predetermined depth, such as the lower end of the receiving distal end cone 160, the acceleration signal transmitted from the sending accelerometer 173 is transmitted to the receiving accelerometer 173).

It is shown in detail in FIG. 5 in connection with the acceleration signal relating to the above-mentioned contents. 5 corresponds to a source dynamic conical tuner 100 ', and a receiver corresponds to a receive dynamic tuner 100. In FIG.

5 shows a signal obtained from a transmitting dynamic conical tuner 100 'as a transmitter and a received dynamic conical tuner 100 as a receiver, in which the first large signal of the transmitter is a signal of the obtained time of the received signal, Using the car, the propagation time (

Figure pat00015
), And the shear wave velocity is calculated.

The interval in which the waveform of the normalization acceleration firstly generated due to the originating dynamic connequencer 100 'is abruptly changed is 5 milliseconds (ms), and the interval of the normalization acceleration generated first due to the receiving dynamic conner / The time period in which the waveform of the accelerating acceleration suddenly changes is about 8 milliseconds (ms).

That is, the propagation time (

Figure pat00016
Is the time taken for the acceleration signal to reach the receiving accelerometer 173 from the originating accelerometer 173 'and the distance between the originating tip cone 160' and the receiving tip cone 160
Figure pat00017
Is applied to the above equation (2), the shear acceleration is calculated.

In addition, since the dynamic cone penetration index (DCPI) representing the ground strength characteristic is a penetration depth per hammer 1 strike, the number of impacts and the interested grain size recorded in the data logger 310 are used Process).

This shear acceleration is a very important parameter for evaluating the more accurate stiffness characteristics. Using the obtained shear acceleration can help to more accurately evaluate the stiffness characteristics of the target ground.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

100: Dynamic conical tuning (receiver)
110: Drop Hammer
120: Receiving Hammer Guide
130: Reception cushion (Cushion)
140: Receiving anvil (Anvil)
150: Penetration rod
160: Receive end cone (Cone)
161: Receive cone Tip
162: Receive Cone Body
170: reception measuring unit
173: Receive Accelerometer
100 ': Dynamic Conduit Welding (transmitter)
110 ': Drop Hammer
120 ': Outgoing Hammer Guide
130 ': Outgoing cushion (Cushion)
140 ': Outgoing Anvil (Anvil)
150 ': Penetration rod
160 ': Outgoing distal cone (Cone)
161 ': Cone Tip
162 ': Outgoing Cone Body (Cone Body)
170 ': transmission measuring unit
173 ': Outgoing accelerometer
200: guide device
210: Base portion
211: first base plate
212: second base plate
220:
221: Outgoing guide bar
222: Receiver guide rods
230: vertical guide portion
231: upper guide bar
232: upper guide connector
233: Lower guide bar
234: Lower guide connector
240: hammer guide portion
241: Outgoing Hammer Guide
241a: Outgoing hammer supporting member
241b:
242: Receiving Hammer Guide
242a: receiving hammer supporting member
242b: Receiving support
410: Data logger
420: computer

Claims (14)

A guide device 200 mounted on the surface of the target ground;
A receiving dynamic conical pipe (100) passing through the guide device (200) and dynamically penetrating the object ground by a predetermined depth;
A dynamic dynamic conical pipe (100 ') spaced apart from the receiving dynamic conical pipe (100) and passing through the guide device (200) and being dynamically penetrated by a predetermined depth into the target ground;
A data logger 410 for recording the originating signal and the acceleration signal transmitted from the receiving dynamic conical tuning device 100 and the originating dynamic conical tuning device 100 '; And
And a computer (420) for outputting the origination signal and the acceleration signal recorded in the data logger (410)
Wherein the guide device (200) secures the receiving dynamic conical tube (100) and the originating dynamic conical tube (100 '). The method according to claim 1,
The guide device (200)
A base part 210 having a shape of a cubic shape and having a shape of an adjacent one of the first base plate 211 and the second base plate 212 having the same size and being mounted on the surface of the target ground;
A horizontal guide part 220 extending upward from the base part 210 and including a parallel reception guide bar 221 and an outgoing guide bar 222 spaced apart from each other;
A vertical guide part 230 arranged to be vertical while connecting the first base plate 211 and the second base plate 212; And
And a hammer guide unit 240 extending from the base unit 210 to surround the upper ends of the first base plate 211 and the second base plate 212,
The receiving dynamic conical tube 100 is inserted into the receiving guide rod 222 and is dynamically introduced into the target ground,
Wherein the originating dynamic conic section (100 ') is inserted into the originating guide rod (221) and is dynamically penetrated into the target section. 3. The method of claim 2,
The vertical guide part 230 may be formed,
An upper guide bar 231 disposed to be perpendicular to the transmission guide bar 221 and the reception guide bar 222;
An upper guide connection pipe 232 connected to both ends of the upper guide bar 231 and inserted and fixed in contact with the outer circumferential surfaces of the transmission guide bar 221 and the reception guide bar 222;
A lower guide bar 233 positioned below the upper guide bar 231 and arranged to be perpendicular to the transmission guide bar 221 and the reception guide bar 222; And
And a lower guide connection pipe (234) connected to both ends of the lower guide bar (233) and inserted and fixed in contact with the outer circumferential surfaces of the transmission guide bar (221) and the reception guide bar (222) Dynamic Conduit Wearing System for Obtaining Shear Wave Velocity. The method of claim 3,
The hammer guide part 240 includes:
A transmission hammer supporting member 241a surrounding the upper end of the transmission guide bar 221 and a transmission hammer supporting member 241a extending radially from the outer circumferential surface of the transmission hammer supporting member 241a toward the respective vertexes of the first base plate 211, An outgoing hammer guide 241 including a support 241b; And
A receiving hammer supporting member 242a surrounding the upper end of the receiving guide bar 222 and a receiving portion 242a extending radially from the outer circumferential surface of the receiving hammer supporting member 242a toward the respective vertexes of the second base plate 212, And a receiving hammer guide (242) comprising a support (242b). ≪ Desc / Clms Page number 26 > 5. The method of claim 4,
The receiving dynamic cone drilling machine (100)
A receiving drop hammer 110 dropping at a predetermined height to load impact energy;
A receiving hammer guide (120) for guiding the movement of the receiving drop hammer (110);
A receiving anvil 140 for transmitting the impact energy transmitted from the receiving drop hammer 110;
A receiving intrusion rod 150 extending in the longitudinal direction from the receiving anvil 140 and inserted into the receiving guide bar 221; And
And a receiving tip cone (160) connected to an end of the receiving intrusion rod (150) and provided with a receiving accelerometer (173) for measuring the acceleration signal. system. 6. The method of claim 5,
The originating dynamic cone drilling machine 100 '
An originating drop hammer 110 'that falls at a predetermined height to load impact energy;
An originating hammer guide 120 'for guiding the movement of the originating drop hammer 110';
A transmission anvil 140 'for transmitting impact energy transmitted from the transmission drop hammer 110';
A transmitting intrusion rod 150 'extending longitudinally from the transmitting anvil 140' and inserted into the transmitting guide rod 222; And
And an originating tip cone (160 ') connected to an end of the transmitting intrusion rod (150') and having a source accelerometer (173 ') for transmitting the acceleration signal to the receiving accelerometer (173)
And obtaining the shear wave velocity using the acceleration signal. ≪ RTI ID = 0.0 > 11. < / RTI > The method according to claim 6,
The shear wave velocity (
Figure pat00018
),
Figure pat00019

(here,
Figure pat00020
The distance between the outgoing dynamic cone penetration and the received dynamic cone penetration,
Figure pat00021
= Time until the acceleration signal generated by the originating accelerometer is received by the receiving accelerometer if the originating drop hammer is dynamically struck)
Wherein the operation of the dynamic crowning system for obtaining the ground shear wave velocity is performed by the following equation. (a) positioning a guide device (200) on a surface of a target ground;
(b) inserting and placing the receiving dynamic conical tube 100 and the outgoing dynamic conical tube 100 'in the guide device 200 so as to be parallel to and perpendicular to the surface of the target soil;
(c) dynamic dynamic penetration of the receiving dynamic cone constructor (100) by a predetermined depth into the target soil; And
(d) dynamic dynamic penetration of the originating dynamic cone constructor (100 ') by a predetermined depth into the object foundation,
Wherein the shear wave velocity is obtained using the acceleration signal generated in step (d). 9. The method of claim 8,
In the step (a)
The guide device (200)
A base part 210 having a shape of a cubic shape and having a shape of an adjacent one of the first base plate 211 and the second base plate 212 having the same size and being mounted on the surface of the target ground;
A horizontal guide part 220 extending upward from the base part 210 and including a parallel reception guide bar 221 and an outgoing guide bar 222 spaced apart from each other;
A vertical guide part 230 arranged to be vertical while connecting the first base plate 211 and the second base plate 212; And
And a hammer guide part (240) extending from the base part (210) to surround the upper ends of the first base plate (211) and the second base plate (212) Test Method Using Dynamic Conduit Wearing System for. 10. The method of claim 9,
In the step (b)
The receiving dynamic cone drilling machine (100)
A receiving drop hammer 110 dropping at a predetermined height to load impact energy;
A receiving hammer guide (120) for guiding the movement of the receiving drop hammer (110);
A receiving anvil 140 for transmitting the impact energy transmitted from the receiving drop hammer 110;
A receiving intrusion rod 150 extending in the longitudinal direction from the receiving anvil 140 and inserted into the receiving guide bar 221; And
And a receiving tip cone (160) connected to an end of the receiving intrusion rod (150) and provided with a receiving accelerometer (173) for measuring the acceleration signal. Test method using system. 11. The method of claim 10,
In the step (b)
The originating dynamic cone drilling machine 100 '
An originating drop hammer 110 'that falls at a predetermined height to load impact energy;
An originating hammer guide 120 'for guiding the movement of the originating drop hammer 110';
A transmission anvil 140 'for transmitting impact energy transmitted from the transmission drop hammer 110';
A transmitting intrusion rod 150 'extending longitudinally from the transmitting anvil 140' and inserted into the transmitting guide rod 222; And
And an originating tip cone 160 'connected to an end of the transmitting intrusion rod 150' and having a source accelerometer 173 'for transmitting the acceleration signal to the receiving accelerometer 173. And a test method using a dynamic conical tuning system for ground shear wave velocity acquisition. 11. The method of claim 10,
The shear wave velocity (
Figure pat00022
),
Figure pat00023

(here,
Figure pat00024
The distance between the outgoing dynamic cone penetration and the received dynamic cone penetration,
Figure pat00025
= Time until the acceleration signal generated by the originating accelerometer is received by the receiving accelerometer if the originating drop hammer is dynamically struck)
Wherein the method is performed by the following equation: < tb >< tb >< TABLE > 11. The method of claim 10,
The step (c)
(c1) repeatedly and vertically reciprocating the receiving drop hammers (110) dynamically hitting the receiving anvil (140), thereby penetrating the receiving intrusion rod (150) to the target ground; And
(c2) terminating a dynamic impact by the receiving drop hammer (110) after reaching a predetermined depth to a lower end of the receiving tip cone (160) Test Method Using Dynamic Conduit Wearing System. 12. The method of claim 11,
The step (d)
(d1) repeatedly and vertically reciprocating the origination drop hammers (110 ') dynamically hitting the origination anvil (140') to penetrate the origination intrusion rod (150 ') into the target ground; And
(d2) terminating the dynamic striking by the originating drop hammer (110 ') after reaching the lower end of the originating distal cone (160') to the predetermined depth. Test Method Using Dynamic Conduit Wearing System for.
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108007798A (en) * 2017-10-24 2018-05-08 湖南大学 Penetration type soil strength and velocity of wave joint test device and its application method
CN109187744A (en) * 2018-08-31 2019-01-11 中国能源建设集团江苏省电力设计院有限公司 A kind of shear wave velocity evaluation method based on cone penetration test
CN110397015A (en) * 2019-07-30 2019-11-01 中国海洋大学 A kind of processing method of seabed in-situ test data
US20200109533A1 (en) * 2018-10-09 2020-04-09 North Carolina State University Portable mini dynamic penetration and torque (mdpt) device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108007798A (en) * 2017-10-24 2018-05-08 湖南大学 Penetration type soil strength and velocity of wave joint test device and its application method
CN109187744A (en) * 2018-08-31 2019-01-11 中国能源建设集团江苏省电力设计院有限公司 A kind of shear wave velocity evaluation method based on cone penetration test
CN109187744B (en) * 2018-08-31 2021-04-16 中国能源建设集团江苏省电力设计院有限公司 Shear wave velocity estimation method based on static cone penetration test
US20200109533A1 (en) * 2018-10-09 2020-04-09 North Carolina State University Portable mini dynamic penetration and torque (mdpt) device
CN110397015A (en) * 2019-07-30 2019-11-01 中国海洋大学 A kind of processing method of seabed in-situ test data
CN110397015B (en) * 2019-07-30 2021-03-30 中国海洋大学 Processing method of seabed in-situ test data

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