Single-hole method shear wave velocity testing device

Abstract

The utility model provides a single-hole method shear wave velocity testing device which comprises a host, a three-component detector and an excitation board assembly, the excitation board assembly is connected to the host, and the three-component detector is also connected to the host; the excitation wood board assembly and the host are arranged on the ground, and the three-component detector is used for being lowered to the ground; the three-component geophone is sleeved with a protective cylinder which is used for protecting a magnetic attraction probe of the three-component geophone. The utility model solves the problems of smooth lowering of the shear wave velocity test probe, accurate signal acquisition, long service life of an excitation wood board, reliable lifting of the probe and the like.

Description

Technical Field

[0001] The utility model belongs to the field of shear wave velocity testing, and particularly relates to a single-hole shear wave velocity testing device. Background Art

[0002] During the engineering exploration drilling stage, in order to explore the shear wave velocity characteristics of underground soil layers, shear wave velocity testing work needs to be carried out. There are the following problems in the current testing work;

[0003] During the test, it is necessary to strike the wooden board and then test. Frequently striking the wooden board easily damages the wooden board; the probe of the three-component geophone is easily touched and opened against the side wall during the falling process, resulting in the inability to reach the specified depth; the probe is easily buried deep underground due to hole collapse, and it is difficult to ensure the quality of the shear wave acquisition signal. Summary of the Utility Model

[0004] In view of this, the utility model aims to propose a single-hole shear wave velocity testing device to solve the above problems.

[0005] To achieve the above object, the technical solution of the utility model is realized as follows:

[0006] A single-hole shear wave velocity testing device includes a main machine, a three-component geophone, and an excitation wooden board assembly;

[0007] The excitation wooden board assembly is connected to the main machine, and the three-component geophone is also connected to the main machine. A velocity trigger sensor is further provided between the excitation wooden board assembly and the main machine;

[0008] The excitation wooden board assembly and the main machine are arranged on the ground,

[0009] The three-component geophone is used to be lowered underground;

[0010] The three-component geophone is sleeved with a protection cylinder for protecting the magnetic suction probe of the three-component geophone.

[0011] Further, the protection cylinder shields the three-component geophone, and the probe of the three-component geophone provides a force to the protection cylinder to realize the relative fixation between the protection cylinder and the three-component geophone.

[0012] Further, the material of the protection cylinder is degradable paper.

[0013] Further, the excitation wooden board assembly includes a wooden board body and a fixing cage, and the wooden board body is installed in the fixing cage;

[0014] The wooden board body is in the shape of a flat rectangle;

[0015] Wherein the fixed cage includes a bottom plate and U-shaped side walls. One U-shaped side wall is provided on each side of the upper surface of the bottom plate, and the bottom of the U-shaped side wall is fixedly connected to the bottom plate along the contour of the bottom plate;

[0016] Connecting bars are provided at the tops of the U-shaped side walls, and a hollow structure is formed between several connecting bars;

[0017] An installation area is formed among the bottom plate, the two U-shaped side walls and several connecting bars for installing the template body.

[0018] Further, a knocking convex block is provided at the end of the U-shaped side wall, and the knocking convex block is used for cooperating with hammering; the knocking convex block is of a cylindrical structure, with a length of 10 cm and a diameter not greater than the height of the wooden board body.

[0019] Further, the wooden board body is designed within a safety area, and the wooden board body can contact the bottom plate, the U-shaped side walls and the connecting bars.

[0020] Further, the sum of the lengths of the two U-shaped side walls is less than the length of the bottom plate.

[0021] Further, a protective steel wire is also provided between the three-component geophone and the main unit.

[0022] Further, the ratio of the length, width and height of the wooden board body is 20:3:1.

[0023] Compared with the prior art, the single-hole shear wave velocity testing device of the present utility model has the following advantages:

[0024] (1) For the single-hole shear wave velocity testing device of the present utility model, a fixed cage is installed on the wooden board body to completely wrap the wooden board body, extending the service life of the wooden board body; and during the knocking process, better shear wave signals can be adopted while well suppressing compression wave signals; knocking convex blocks are arranged at both ends of the wooden board, making it easier to excite shear wave signals.

[0025] (2) For the single-hole shear wave velocity testing device of the present utility model, a protection cylinder is installed to prevent the magnetic probe from being knocked open during the process of lowering the probe, so that the probe cannot be lowered to the designated depth.

[0026] (3) For the single-hole shear wave velocity testing device of the present utility model, a protective steel wire is provided to prevent the probe from being buried due to hole collapse. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings constituting a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0028] Figure 1 Schematic diagram of a single-hole shear wave velocity testing device according to an embodiment of the present utility model;

[0029] Figure 2 Schematic diagram of the excitation wooden board assembly according to an embodiment of the present utility model.

[0030] Description of the reference numerals:

[0031] 1. Mainframe; 2. Three-component geophone; 3. Excitation wooden board assembly; 31. Wooden board body; 32. Fixed cage; 321. Bottom plate; 322. U-shaped side wall; 323. Connecting strip; 324. Knocking convex block; 4. Casing; 5. Velocity trigger sensor; 6. Heavy object; 7. Protection steel wire; 8. Test acquisition line; 9. Hammer. Specific implementation manners

[0032] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0033] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "plurality" is two or more.

[0034] In the description of the present utility model, it should be noted that, unless otherwise clearly defined and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0035] The present utility model will be described in detail below with reference to the drawings and in combination with embodiments.

[0036] A single-hole shear wave velocity testing device, asFigure 1 - Figure 2 As shown in the figure, it includes a host 1, a three-component geophone 2 and a vibration excitation wooden board assembly 3;

[0037] The vibration excitation wooden board assembly 3 is connected to the host 1, and the three-component geophone 2 is also connected to the host 1 through a test acquisition line 8; A speed trigger sensor 5 is also provided between the vibration excitation wooden board assembly 3 and the host 1;

[0038] The vibration excitation wooden board assembly 3 and the host 1 are arranged on the ground,

[0039] The three-component geophone 2 is used to be lowered underground;

[0040] The three-component geophone 2 is sleeved with a protection cylinder 4 for protecting the magnetic suction probe of the three-component geophone 2.

[0041] Preferably, the protection cylinder 4 shields the three-component geophone 2, and the probe of the three-component geophone 2 provides a force to the protection cylinder 4 to realize the relative fixation between the protection cylinder 4 and the three-component geophone 2.

[0042] Preferably, the material of the protection cylinder 4 is degradable paper.

[0043] Preferably, the vibration excitation wooden board assembly 3 includes a wooden board body 31 and a fixing cage 32, and the wooden board body 31 is installed in the fixing cage 32;

[0044] The wooden board body 31 is in the shape of a flat rectangle;

[0045] Wherein the fixing cage 32 includes a bottom plate 321 and U-shaped side walls 322. One U-shaped side wall 322 is provided on each side of the upper surface of the bottom plate 321, and the bottom of the U-shaped side wall 322 is fixedly connected to the bottom plate 321 along the contour of the bottom plate 321;

[0046] Connecting bars 323 are provided at the tops of the U-shaped side walls 322, and a hollow structure is formed between several connecting bars 323;

[0047] An installation area is formed among the bottom plate 321, the two U-shaped side walls 322 and several connecting bars 323 for installing the template body.

[0048] Preferably, a knocking convex block 324 is provided at the end of the U-shaped side wall 322. The knocking convex block 324 is used to cooperate with hammering. The knocking convex block 324 is in a cylindrical structure with a length of 10 cm and a diameter not greater than the height of the wooden board body 31.

[0049] Preferably, the wooden board body 31 is designed within a safety area, and the wooden board body 31 can contact the bottom plate 321, the U-shaped side walls 322 and the connecting bars 323.

[0050] Preferably, the sum of the lengths of the two U-shaped side walls 322 is smaller than the length of the bottom plate 321 .

[0051] Preferably, a protective steel wire 77 is further provided between the three-component detector 2 and the host 1 .

[0052] Preferably, the size of the wooden board body 31 is 2*0.3*0.1m. According to the vibration and propagation direction of the shear wave, the knocking process will inevitably produce P waves (compression waves), but the length of the wooden board can be reduced. The size of a wooden board with a length of 2m can effectively suppress the P wave (compression wave) while collecting shear waves with high-quality signals.

[0053] Put the probe on the casing 4 and lower it to the specified depth. The casing 4 is filled with mud during the process of falling, and the fall is more stable. Then gently lift the three-component geophone 2 upwards to let the three-component geophone 2 escape from the casing 4. Open the probe and prepare for detection.

[0054] A heavy object 6 is used to press the vibration board assembly 3 on the ground, and then a hammer 9 strikes the striking protrusion 324 of the fixed cage 32. The speed trigger sensor 5 receives the striking signal and transmits it to the host 1, and then performs detection.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A single-hole shear wave velocity testing device, characterized in that: It includes a main unit, a three-component detector and an exciting wooden board assembly; The excitation board assembly is connected to the host, the three-component detector is also connected to the host, and a speed trigger sensor is also arranged between the excitation board assembly and the host; The vibration board assembly and the host are set on the ground. The three-component geophone is used to be lowered into the subsurface; The three-component geophone is externally connected with a protective sleeve for protecting the magnetic suction probe of the three-component geophone.

2. A single-hole shear wave velocity testing device according to claim 1, characterized in that: The sheath shields the three-component geophone, wherein the probe of the three-component geophone provides a force to the sheath, thereby achieving relative fixation between the sheath and the three-component geophone.

3. A single-hole shear wave velocity testing device according to claim 2, characterized in that: The material of the protective tube is degradable paper.

4. A single-hole shear wave velocity testing device according to claim 1, characterized in that: The excitation wood board assembly comprises a wood board body and a fixing cage, wherein the wood board body is installed in the fixing cage; the wood board body is in the shape of a flat rectangular body; The fixed cage comprises a bottom plate and a U-shaped side wall, a U-shaped side wall is respectively provided on both sides of the upper surface of the bottom plate, and the bottom of the U-shaped side wall is fixedly connected to the bottom plate along the contour of the bottom plate; A connecting strip is provided on the top of the U-shaped side wall, and a hollow structure is formed between the connecting strips; An installation area is formed between the bottom plate, the two U-shaped side walls and a plurality of connecting strips for installing the template body.

5. A single-hole shear wave velocity testing device according to claim 4, characterized in that: A knocking bump is provided at the end of the U-shaped side wall, and the knocking bump is used to cooperate with hammering; the knocking bump is a cylindrical structure with a length of 10 cm and a diameter not greater than the height of the wooden board body.

6. A single-hole shear wave velocity testing device according to claim 5, characterized in that: The wooden board body is designed to be within the safety zone, and the wooden board body can be in contact with the bottom plate, the U-shaped side wall and the connecting strip.

7. The single-hole shear wave velocity testing device according to claim 1, characterized in that: The sum of the lengths of the two U-shaped side walls is less than the length of the bottom plate.

8. The single-hole shear wave velocity testing device according to claim 1, characterized in that: A protective steel wire is also arranged between the three-component detector and the host.

9. The single-hole shear wave velocity testing device according to claim 4, characterized in that: The length, width and height ratio of the wooden board body is 20:3:1.

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