A seismic source device for shear wave exploration

Abstract

The invention provides a seismic source device for shear wave exploration, which relates to the technical field of geological survey, and comprises an outer shell, a connecting seat, a locking mechanism and a seismic source charge column. The outer shell comprises a C-shaped shell with a hollow interior and a straight cylindrical shape. The lower end of the C-shaped shell is closed, and a connecting tube is fixed to the upper end. A V-shaped energy focusing groove which is longitudinally arranged and penetrates the shell is arranged on the side of the shell. A V-shaped energy focusing groove shell with a V-shaped structure is arranged on the V-shaped energy focusing groove. A cylindrical seismic source charge column is arranged inside the outer shell. The outer side of the seismic source charge column is tightly attached to the inner side wall of the shell. A cavity is also formed in the part of the seismic source charge column in the V-shaped energy focusing groove shell. The part of the V-shaped energy focusing groove shell serves as an energy focusing direction, and the part of the shell serves as a non-energy focusing direction. When in use, the Monroe effect is utilized, and the generated shock wave first diffuses from the direction of the V-shaped energy focusing groove shell with a relatively thin thickness, forming a directional high pressure, and converging into a horizontal shock wave.

Description

Technical Field

[0001] The invention relates to the technical field of geological survey, in particular to a seismic source device for shear wave exploration. Background Art

[0002] Artificially stimulating seismic waves is an important method for obtaining underground geological information and resource occurrence forms, and is therefore widely used in geophysical exploration operations. In recent years, shear wave geophysical exploration has received widespread attention in the industry due to its inherent advantages in determining underground lithology, fractures, and oil and gas content. How to stimulate seismic shear waves efficiently and at low cost is an important issue that needs to be solved urgently. The key to the difficulty in solving the low-cost solution of shear wave excitation is that horizontal shear waves are different from gravity and cannot be obtained naturally.

[0003] At present, most of them use the deadweight of large earthquake source vehicles and convert it into horizontal shear wave components through the conversion device of the lateral vibrator. This method is costly and the operation site is also limited. There are also some shallow shear wave earthquakes, which obtain shear wave information by applying horizontal impact force to a rigid body deep underground. However, this method is limited by insufficient kinetic energy or poor coupling between the rigid body and the underground medium under the action of external forces, making it difficult to obtain a stable excitation effect. At present, it can only be applied to shallow exploration.

[0004] In the existing seismic exploration field, seismic charge columns are usually used for longitudinal wave excitation. In order to form downward seismic waves at the bottom of the vertical shaft, dense mud soil is generally applied above the charge columns to achieve the purpose of focusing energy downward. Compared with vehicle-mounted seismic sources or other mechanical vibration methods, the construction of seismic charge columns has low construction costs and high efficiency, and can be operated in various complex terrain environments. The shortcoming of the existing technology is that there is no device that can effectively convert the instantaneous explosive energy of the seismic charge column into a horizontal shear wave direction, which limits the development of shear wave exploration. Summary of the invention

[0005] The object of the present invention is to provide a seismic source device for shear wave exploration to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A seismic source device for shear wave exploration, comprising at least one seismic source charge column and an outer shell for correspondingly accommodating the charge column, characterized in that:

[0008] The seismic charge column has a cylindrical shape, and a focusing cavity is arranged on its side, which is parallel to the cylindrical axis and passes through both ends of the seismic charge column. The cross section of the focusing cavity is V-shaped, and the top angle of the V-shaped cross section faces the axis direction of the seismic charge column. The seismic charge column is loaded in the outer shell;

[0009] The outer shell is a C-shaped shell with the same number as the source charge column and a hollow interior. The lower end of the C-shaped shell is closed, and a connecting tube is fixedly installed on the upper end. The upper and lower adjacent C-shaped shells are connected by connecting tubes, and a connecting seat is also fixedly connected in the uppermost connecting tube. The side of the C-shaped shell is also provided with a V-shaped energy-gathering groove parallel to the axial direction of the C-shaped shell. The thickness of the C-shaped outer shell is greater than the thickness of the V-shaped energy-gathering groove shell. The C-shaped shell in the V-shaped energy-gathering groove is installed A V-shaped energy-gathering groove shell with a V-shaped cross section and a thickness less than that of a C-shaped shell, the C-shaped shell, the V-shaped energy-gathering groove shell and the connecting seat enclose an explosive chamber for accommodating a seismic source charge column, the diameter of the seismic source charge column is equal to the inner wall diameter of the C-shaped shell, the energy-gathering cavity formed by the seismic source charge column is closely attached to the inner side wall of the V-shaped energy-gathering groove shell, the upper and lower ends of the seismic source charge column are respectively against the bottom of the connecting seat and the lower end of the C-shaped shell, the seismic source charge column is located in the opening direction of the V-shaped energy-gathering groove as the energy-gathering direction, and the other parts are in the non-energy-gathering direction;

[0010] A detonator for detonating the seismic source charge is also installed in the seismic source charge column, and the lead of the detonator is led outward from the outer shell;

[0011] When in use, according to the Monroe effect, the detonation energy generated at the explosion center of the seismic charge diffuses outward along the normal direction of the V-shaped energy focusing groove and converges at its central axis, thereby first breaking through the thinner outer shell of the V-shaped energy focusing groove and forming a horizontal transverse wave outward. At the same time, the thickened outer shell in the non-energy focusing direction has a strong restraining effect on the diffusion of the detonation energy, thereby suppressing the release of energy in the non-energy focusing direction and enhancing the convergence of the detonation energy in the direction of the V-shaped energy focusing groove.

[0012] Preferably, the interior of the connecting tube is hollow and communicated with the interior of the C-shaped shell. The outer side of the lower end of the C-shaped shell is provided with a connecting external thread, and the inner side of the connecting tube is provided with a connecting internal thread matching the connecting external thread.

[0013] Preferably, the connecting seat includes a connecting sleeve with an opening at the lower end, the interior of the connecting sleeve is hollow, and the outer side is also provided with a connecting external thread matching the connecting internal thread, the connecting sleeve is connected to the connecting tube via the connecting external thread, the top of the connecting sleeve is open, and at least two snap seats are symmetrically arranged, and a snap groove is arranged on the outer side of the snap seat.

[0014] Preferably, the connecting seat is also movably provided with a locking mechanism for locking and releasing the connecting seat, the locking mechanism comprising a connecting rod, a limiting block is fixed at the bottom of the connecting rod, a limiting ring is fixed on the connecting rod above the limiting block, a slidable moving ring is sleeved on the connecting rod between the limiting ring and the limiting block, a spring is sleeved on the connecting rod, one end of the spring is against the moving ring, and the other end is against the limiting ring;

[0015] The connecting rod is symmetrically provided with mounting seats of the same number as the buckle seats on the outside, the upper end of the mounting seats is hinged to the first connecting rod, the lower end is hinged to the second connecting rod, and the other ends of the first connecting rod and the second connecting rod are respectively hinged to the outer side of the limit ring and the outer side of the moving ring;

[0016] A C-shaped fixing arm is fixed on the mounting seat, the upper end of the fixing arm is fixed to the outer side of the mounting seat, and the bottom is clamped in the clamping groove of the buckle seat.

[0017] Preferably, the C-shaped shell and the V-shaped energy-gathering groove shell are both made of hard PVC material, the thickness of the C-shaped shell is in the range of 4mm-7mm, and the thickness of the V-shaped energy-gathering groove shell is 1mm.

[0018] Preferably, the angle degree range of the V-shaped energy focusing groove is 40-70°, and the distance from the cone angle of the V-shaped energy focusing groove to the central axis of the C-shaped shell is 3 / 5*R, wherein R is the inner radius of the C-shaped shell.

[0019] Preferably, two ear-hanging holes are symmetrically arranged on the side surface of the connecting tube, and the ear-hanging holes penetrate the side wall of the connecting tube.

[0020] Preferably, at least two groups of the peripheral shells are provided, and the plurality of peripheral shells are longitudinally connected via connecting external threads on the outside of the C-shaped shell and connecting internal threads on the inside of the connecting tube.

[0021] Preferably, the source device also includes an extension device, which includes an extension rod, a connecting cavity is provided at the bottom of the extension rod, an internal thread is provided on the inner wall of the connecting cavity, and the top of the connecting rod and the top of the extension rod are both provided with external threads matching the internal threads of the inner wall of the connecting cavity.

[0022] Preferably, marking strips arranged along the extension direction of the connecting rod are provided on the outer side of the connecting rod and the outer side of the extension rod.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The outer shell for installing the seismic charge column in the present invention is an explosive structure provided with a transverse energy-gathering cavity. The seismic charge column is filled inside the C-shaped shell. Since the outer side of the seismic charge column is in close contact with the inner side wall of the C-shaped shell and the V-shaped energy-gathering groove shell, a cavity is also formed in the part of the seismic charge column in the V-shaped energy-gathering groove shell. The opening direction of the energy-gathering groove cavity is used as the energy-gathering direction, and the part of the C-shaped shell is used as the non-energy-gathering direction. When in use, the Monroe effect is utilized. After the seismic charge column is detonated, the cavity part of the seismic charge column is closest to the explosion center, so a shock wave will be formed first, and the generated shock wave can be transmitted from the thicker The thin V-shaped energy-gathering groove diffuses in the direction of the outer shell, forming a directional high pressure, which converges into a horizontal shock wave. The thicker C-shaped outer shell in the non-energy-gathering direction has a strong restraining effect on the detonation wave and the overflow of explosive materials in the non-energy-gathering direction at the moment of explosion, and can guide more detonation energy to gather in the energy-gathering direction and enhance the energy-gathering effect. At the same time, the thicker C-shaped outer shell in the non-energy-gathering direction can enhance the inward reflection of the detonation energy and reduce the outward transmission of the detonation energy in the non-energy-gathering direction, thereby forming more explosive energy in the energy-gathering direction. The successful development of the shear wave exploration device has greatly improved the efficiency of field shear wave exploration and has positive practical significance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall decomposition structure of the present invention;

[0026] Figure 2 It is a schematic diagram of the cross-sectional structure of the peripheral shell in the present invention;

[0027] Figure 3 It is a schematic diagram of the energy focusing direction structure of the outer shell in the present invention;

[0028] Figure 4 It is a schematic diagram of the exploded structure of the peripheral shell in the present invention;

[0029] Figure 5 It is a schematic diagram of the cross-sectional structure of the peripheral shell in the present invention;

[0030] Figure 6 It is a schematic diagram of the internal structure of the outer shell in the present invention;

[0031] Figure 7 It is a schematic diagram of the connection structure of two peripheral shells in the present invention;

[0032] Figure 8 It is a structural schematic diagram of the combination of the outer shell and the connecting seat in the present invention;

[0033] Fig. 9 It is a schematic diagram of the connection structure between the locking mechanism and the connecting seat in the present invention;

[0034] Fig.10It is a structural schematic diagram of the locking mechanism in the present invention;

[0035] Fig.11 It is a schematic diagram of the connection structure of the extension rod and the connecting rod in the present invention;

[0036] Fig.12 It is a schematic diagram of the overall structure of the present invention;

[0037] Fig.13 The figure is a schematic diagram of the connection structure between the detonator and the lead in the present invention.

[0038] In the figure: outer shell 10, C-shaped shell 11, V-shaped energy gathering groove 12, V-shaped energy gathering groove shell 13, connecting tube 14, ear hole 15, connecting seat 20, connecting sleeve 21, buckle seat 22, clamping groove 23, locking mechanism 30, connecting rod 31, limit ring 32, limit block 33, moving ring 34, mounting seat 35, first connecting rod 36 hinged, second connecting rod 37, spring 38, fixed arm 39, extension device 40, extension rod 41, connecting cavity 42, marking strip 43, seismic source charge 50, energy gathering cavity 51, detonator 60, lead 70. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] See also Figure 1-13 , the present invention provides a technical solution:

[0041] Example:

[0042] See also Figures 1 to 13 , the present invention provides a technical solution:

[0043] A seismic source device for shear wave exploration comprises at least one seismic source charge column 50 and a peripheral shell 10 for accommodating the charge column, wherein:

[0044] The seismic charge column 50 is a part used to generate explosive energy and is usually made of high-energy explosives. The seismic charge column 50 is placed inside the outer shell 10, and its outer surface fits tightly against the inner walls of the C-shaped shell 11 and the V-shaped energy focusing groove shell 13. This tight-fitting design helps to ensure that the energy generated by the explosion of the explosives can be effectively transmitted through the outer shell 10 and the V-shaped energy focusing groove 12, thereby generating the required shear waves, ensuring that the seismic charge column 50 can fully utilize the structural characteristics of the outer shell 10 during the explosion. A V-shaped energy focusing cavity 51 is also provided on the side of the seismic charge column 50, and the whole is loaded inside the outer shell 10 to focus and direct the explosion energy, so as to generate more effective shear wave signals for geological exploration.

[0045] A detonator 60 for detonating the seismic charge 50 is also installed in the seismic charge column 50 , and a lead 70 of the detonator 60 is led outward from the outer shell 10 . When the explosive needs to be detonated, the detonator 60 can be detonated by igniting the lead 70 .

[0046] The seismic charge column 50 is tightly packed inside the outer shell 10, the diameter of the seismic charge column 50 is equal to the inner diameter of the C-shaped shell 11, and a longitudinally arranged energy-gathering cavity 51 is provided on the side of the seismic charge column 50 and penetrates the seismic charge column 50. The outer side of the seismic charge column 50 is in close contact with the inner wall of the C-shaped shell 11, the side of the energy-gathering cavity 51 is in close contact with the inner wall of the V-shaped energy-gathering groove shell 13, and the outer side of the seismic charge column 50 is in close contact with the inner walls of the C-shaped shell 11 and the V-shaped energy-gathering groove shell 13.

[0047] The outer shell 10 includes a C-shaped shell 11 which is hollow inside and in the shape of a straight cylinder. The lower end of the C-shaped shell 11 is closed, and a connecting tube 14 is fixed to the upper end. The side of the C-shaped shell 11 is provided with a V-shaped energy focusing groove 12 which is longitudinally arranged and penetrates the C-shaped shell 11. The cross-sectional shape of the V-shaped energy focusing groove 12 is fan-shaped, and the top angle of the V-shaped energy focusing groove 12 faces the central axis of the C-shaped shell 11. The connecting tube 14 is hollow inside and is connected to the interior of the C-shaped shell 11.

[0048] The structure of the outer shell 10 is to generate focused shock waves and then shear waves by utilizing the Monroe effect. The Monroe effect is the influence of the shape of an explosive on the explosion effect, wherein the portion of the explosive facing the target has a specific concave structure, which can cause the shock waves generated by the explosion to focus at the concave portion, thereby forming a penetrating effect on the target. Since the outer side of the source charge column 50 is in close contact with the inner side walls of the C-shaped shell 11 and the V-shaped energy focusing groove shell 13, a cavity is also formed in the portion of the source charge column 50 in the V-shaped energy focusing groove shell 13. This cavity determines Directional release of explosive energy, with part of the V-shaped energy focusing trough shell 13 as the energy focusing direction, and part of the C-shaped shell 11 as the non-energy focusing direction. When in use, the Monroe effect is utilized. When the seismic source charge 50 is detonated, due to the shape and position of the V-shaped energy focusing trough shell 13, the explosion product will first form a shock wave in the direction of the V-shaped energy focusing trough shell 13. This shock wave can first diffuse from the direction of the thinner V-shaped energy focusing trough shell 13 to form a directional high pressure. The explosive energy is effectively directed and focused to form a lateral shock wave.

[0049] In this embodiment, the angle range of the V-shaped energy focusing groove 12 is 40°-70°, and the distance from the cone angle of the V-shaped energy focusing groove 12 to the central axis of the C-shaped shell 11 is 3 / 5*R, wherein R is the inner radius of the C-shaped shell 11, and the outer side of the seismic source charge 50 is close to the inner wall of the C-shaped shell 11 and the V-shaped energy focusing groove shell 13. Therefore, a V-shaped cavity is also formed in the part of the seismic source charge 50 in the V-shaped energy focusing groove shell 13, and the depth of this cavity is 2 / 5*R. The angle of the V-shaped energy focusing groove 12 is calibrated as α, and the distance from the cone angle of the V-shaped energy focusing groove 12 to the central axis of the C-shaped shell 11 is calibrated as L. Then the ranges of α and L are: 40°≤α≤70°, L=3 / 5*R.

[0050] Furthermore, the angle α of the V-shaped energy concentrating groove 12 is preferably 50°.

[0051] When in use, the entire outer shell 10 filled with the seismic charge 50 is placed in a pre-drilled detection hole. At this time, after the seismic charge 50 is detonated, since the thickness of the C-shaped shell 11 is greater than the thickness of the V-shaped energy focusing groove shell 13, and the C-shaped shell 11 is made of a material with a large elastic modulus, the generated energy will diffuse along the direction of the V-shaped energy focusing groove 12, and the direction of the generated shock wave is horizontal. Since part of the C-shaped shell 11 is thicker and the V-shaped energy focusing groove shell 13 arranged at the V-shaped energy focusing groove 12 is thinner, part of the V-shaped energy focusing groove shell 13 is used as the energy focusing direction, and part of the C-shaped shell 11 is used as the non-energy focusing direction. When in use, the shock wave energy generated by the explosion of the seismic charge 50 will first diffuse from the thinner V-shaped energy focusing groove shell 13 to form a directional high pressure, and then generate a transverse wave. The designed thickness of the V-shaped energy focusing groove shell 13 is only 1 mm.

[0052] A V-shaped energy gathering groove shell 13 with a V-shaped structure is arranged on the V-shaped energy gathering groove 12. The V-shaped energy gathering groove shell 13 and the C-shaped shell 11 are fixed to each other. The thickness of the C-shaped shell 11 is greater than that of the V-shaped energy gathering groove shell 13. A connecting external thread is arranged on the outer side of the lower end of the C-shaped shell 11, and a connecting internal thread matching the connecting external thread is arranged on the inner side of the connecting tube 14.

[0053] In the present embodiment, the C-shaped shell 11 and the V-shaped energy focusing trough shell 13 are both made of materials with a relatively large elastic modulus, including but not limited to metal materials with a relatively high elastic modulus such as steel, aluminum, titanium, and hard PVC materials. The thickness of the C-shaped shell 11 ranges from 4mm to 7mm, and the thickness of the V-shaped energy focusing trough shell 13 is 1mm. It should be noted here that, unlike industrial rock blasting, the shear wave used in geological exploration does not simply create short-range lateral fractures, but obtains more elastic wave energy outside the rock formation crushing and fracturing zone. Because the PVC material is incompressible, in conventional directional pre-splitting blasting projects, the PVC shell of the V-shaped energy focusing trough part is usually required to have a certain thickness to create more jets during the collapse of the V-shaped energy focusing trough. The V-shaped energy focusing trough shell 13 of the present embodiment is designed to have a thickness of only 1mm, which only plays the role of sealing, flame retardancy, anti-static, and fixing the seismic source charge column 50, and can reduce the proportion of the jet part in the total blasting energy in the explosion.

[0054] The thickness of the C-type shell 11 is greater than that of the V-shaped energy-gathering groove shell 13. The C-type shell 11 with a larger elastic modulus can be used to enhance the restraining effect on the explosion shock wave. When the explosion shock wave diffuses outward from the explosion center to the inner wall of the C-type shell 11, two physical processes of inward reflection and outward transmission will occur simultaneously. The C-type shell 11 thickened in the non-energy-gathering direction can enhance the inward reflection of the detonation energy and reduce the outward transmission of the detonation energy in the non-energy-gathering direction, thereby forming more explosion energy in the energy-gathering direction.

[0055] While gathering energy, the thickened C-shaped shell 11 increases the distance between the outer shell 10 and the well wall, protects the well wall, reduces the buffering effect of the rupture zone, thereby suppressing the overflow of the explosion shock wave in this direction, reducing the volume of the explosion rupture zone and the consumption of explosive energy. The C-shaped shell 11 with a certain thickness can also stabilize the detonation process of the source device, reduce the damage of the external rarefaction wave to the detonation process, increase the detonation velocity, and increase the detonation pressure.

[0056] The outer shell 10 has a V-shaped energy focusing groove 12, the cross-section of which is fan-shaped, and the top angle is toward the central axis of the C-shaped shell 11. When the seismic source charge 50 is placed in the structure of the outer shell 10 and detonated, the energy generated by the explosion will diffuse along the direction of the normal of the V-shaped energy focusing groove shell 13. The fan-shaped V-shaped energy focusing groove 12 makes the energy generated during the explosion focused along the direction of its shape. Because the thickness of the C-shaped shell 11 is greater than the thickness of the V-shaped energy focusing groove shell 13, and both are made of materials with a larger elastic modulus, the C-shaped shell 11 can withstand more explosion pressure, and the V-shaped energy focusing groove shell 13 is thinner and can be more easily broken when subjected to explosion pressure.

[0057] This embodiment uses the Monroe effect to orient and focus the explosion energy by precisely designing the structure of the source charge column 50 and the peripheral shell 10, thereby generating effective lateral shock waves for geological exploration.

[0058] The thickness of the C-shaped shell 11 is greater than that of the V-shaped energy focusing groove shell 13. When the focused explosion energy propagates along the V-shaped energy focusing groove 12, a high-pressure area will be generated when it reaches the V-shaped energy focusing groove shell 13. Because the thickness of the V-shaped energy focusing groove shell 13 is only 1 mm, this weak point allows the shock wave to break through here and diffuse outward. The larger thickness and high elastic modulus material of the rest of the C-shaped shell 11 can effectively limit the ineffective loss of explosion energy and ensure that the explosion energy mainly diffuses along the direction of the V-shaped energy focusing groove.

[0059] The V-shaped structural design of the V-shaped energy-gathering groove 12 helps to focus the energy generated by the explosion, so that the energy is transmitted along the opening direction of the V. This creates a directional high pressure effect, where the explosion energy is transmitted through the thinner V-shaped energy-gathering groove shell 13, while the thicker C-shaped shell 11 plays a certain limiting role, and the energy diffuses in the non-energy-gathering direction. Such directional high pressure will generate transverse waves in the material or medium, because the shock wave first breaks the material in the energy-gathering direction, and then propagates in the surrounding medium in the form of transverse waves.

[0060] Furthermore, two ear holes 15 are symmetrically arranged on the side of the connecting tube 14, and the ear holes 15 pass through the side wall of the connecting tube 14. The arrangement of the ear holes 15 on the side of the connecting tube 14 is mainly used to provide a fixing or hanging mechanism to facilitate the installation, fixing or operation of the outer shell 10 in practical applications.

[0061] In this embodiment, at least two groups of peripheral shells 10 are provided, and the plurality of peripheral shells 10 are longitudinally connected via the connecting external threads on the outside of the C-shaped shell 11 and the connecting internal threads on the inside of the connecting tube 14 .

[0062] Since an external connecting thread is provided on the outer side of the lower end of the C-shaped shell 11, and an internal connecting thread matching the external connecting thread is provided on the inner side of the connecting tube 14, when multiple peripheral shells 10 are connected, it is only necessary to install the lower end of the C-shaped shell 11 of the upper peripheral shell 10 in the connecting tube 14 of the lower peripheral shell 10 through a thread, and ensure that the V-shaped energy focusing trough shell 13 is all facing in one direction. In this embodiment, multiple peripheral shells 10 are allowed to be longitudinally connected through the external thread of the C-shaped shell 11 and the internal thread of the connecting tube 14, which greatly increases the flexibility and scalability of the system. The number of peripheral shells 10 can be easily increased or decreased according to specific detection needs, thereby adjusting the power and range of shear waves generated during exploration. The use of threaded connection makes the installation and disassembly process of multiple peripheral shells 10 simpler and faster. The design supports standardized and modular applications, making the production, transportation and storage of peripheral shells 10 more convenient.

[0063] The connecting seat 20 includes a connecting sleeve 21 with an opening at the lower end. The interior of the connecting sleeve 21 is hollow, and the outer side is also provided with a connecting external thread matching the connecting internal thread. The connecting sleeve 21 is connected to the connecting tube 14 through the connecting external thread. The top of the connecting sleeve 21 is open, and at least two snap seats 22 are symmetrically provided. The outer side of the snap seats 22 is provided with a locking groove 23. The connecting sleeve 21 can be connected to the connecting tube 14 through the threaded engagement of the connecting external thread and the connecting internal thread. When multiple peripheral shells 10 are connected together, only the topmost peripheral shell 10 is installed with a connecting seat.

[0064] The locking mechanism 30 includes a connecting rod 31, a limiting block 33 is fixed at the bottom of the connecting rod 31, a limiting ring 32 is fixed on the connecting rod 31 above the limiting block 33, and a slidable moving ring 34 is sleeved on the connecting rod 31 between the limiting ring 32 and the limiting block 33. The moving ring 34 can slide along the connecting rod 31, but due to the obstruction of the limiting block 33, it cannot slide out of the connecting rod 31. A spring 38 is sleeved on the connecting rod 31, one end of the spring 38 rests on the moving ring 34, and the other end rests on the limiting ring 32.

[0065] The outside of the connecting rod 31 is symmetrically provided with mounting seats 35 whose number is the same as that of the buckle seat 22. The upper end of the mounting seat 35 is hinged to the first connecting rod 36, and the lower end is hinged to the second connecting rod 37. The other ends of the first connecting rod 36 and the second connecting rod 37 are respectively hinged to the outer side of the limiting ring 32 and the outer side of the moving ring 34. A C-shaped fixing arm 39 is fixed on the mounting seat 35. The upper end of the fixing arm 39 is fixed to the outer side of the mounting seat 35, and the bottom is clamped in the clamping groove 23 of the buckle seat 22.

[0066] When the outer shell 10 is placed in the preset drill hole, the bottom of the fixed arm 39 is clamped in the clamping groove 23 of the buckle seat 22. Under the elastic force of the spring 38, the moving ring 34 is always in a fixed position. At this time, the outer shell 10 is fixed to the locking mechanism 30 through the connecting seat 20, and is placed in the drill hole through a connecting rod 31 of a certain length. When the outer shell 10 reaches the bottom of the drill hole, the connecting rod 31 is pressed down. At this time, the moving ring 34 moves upward relative to the limit block 33, and the angle between the inner sides of the first connecting rod 36 and the second connecting rod 37 becomes smaller. At this time, the fixed arm 39 moves outward and disengages from the clamping groove 23. It only needs to rotate the connecting rod 31 to prevent the fixed arm 39 from being re-inserted into the clamping groove 23, so that the outer shell 10 and the locking mechanism 30 are disengaged. The locking mechanism 30

[0067] It is convenient to place the outer shell 10 for generating shear waves in the borehole, and it can be ensured that it is placed at the required position.

[0068] In this embodiment, the source device also includes an extension device 40, which includes an extension rod 41. A connecting cavity 42 is provided at the bottom of the extension rod 41, and an internal thread is provided on the inner wall of the connecting cavity 42. The top of the connecting rod 31 and the top of the extension rod 41 are both provided with external threads that match the internal threads of the inner wall of the connecting cavity 42.

[0069] The extension rod 41 and the connecting rod 31 can be connected by threads, and multiple extension rods 41 can also be connected together to adapt to drilling holes of different depths.

[0070] Furthermore, marking strips 43 arranged along the extension direction of the connecting rod 31 are provided on the outer sides of the connecting rod 31 and the extension rod 41. When in use, the marking strips 43 on the outer sides of the connecting rod 31 and the extension rod 41 always overlap and face the direction of the V-shaped energy focusing groove 12. In this way, when placing the outer shell, the direction of the V-shaped energy focusing groove 12 can be clearly known.

[0071] In this embodiment, the upper and lower ends of the V-shaped energy-gathering trough shell 13 are not closed. When performing shear wave exploration, the interior of the outer shell 10 is filled with a source charge 50, and a detonator 60 for detonating the source charge 50 is arranged in the source charge 50. If a single outer shell 10 is used, the lead 70 of the detonator 60 is directly led out through the opening of the connecting sleeve 21 at the top. If multiple outer shells 10 are used in combination, such as Fig.13As shown, a gap is left between adjacent V-shaped energy focusing trough shells 13, through which a lead wire 70 is led out. The lead wire 70 is guided along the cavity outside the V-shaped energy focusing trough shell 13 to the top connecting sleeve 21, and is led out from the top opening of the connecting sleeve 21. In order to prevent the seismic source charge 50 inside the outer shell 10 from failing to explode, for combined excitation of two or more outer shells 10 containing seismic source charge 50, each outer shell 10 may be separately provided with a detonating detonator 60 and a lead wire 70, and the lead wire 70 of the detonator 60 is led out together from the top V-shaped energy focusing trough shell 13.

[0072] The use principle of the present invention:

[0073] First, correctly install the detonating cap 60 in the seismic charge column 50, and ensure that the lead 70 of the detonator 60 passes through the top of the V-shaped energy-gathering groove housing 13, so as to facilitate the subsequent connection of the detonating device;

[0074] If multiple peripheral shells 10 are needed to increase the explosive force or adjust the explosion range, the connecting tube 14 of each peripheral shell must be screwed with the connecting external thread on the outer side of the lower end of the C-shaped shell 11 of the next peripheral shell, ensuring that all V-shaped energy focusing grooves 12 are oriented in the same direction to keep the energy focusing direction consistent, and the connecting seat 20 is used to connect with the uppermost peripheral shell 10, and connected through the external thread of the connecting sleeve 21 and the internal thread of the connecting tube 14;

[0075] The outer shell 10 filled with explosives is connected to the connecting rod 31 through the locking mechanism 30, and the extension rod 41 is used to adjust the depth of the outer shell 10 lowered into the drilled hole. Multiple extension rods 41 are connected as needed to ensure that the marking strips 43 are aligned, so as to ensure the correct direction of the V-shaped energy-gathering groove 12. The outer shell 10 is slowly lowered into the pre-drilled detection hole until it reaches the required depth. After reaching the predetermined depth, the connecting rod 31 is pressed downward to move the moving ring 34 upward, and the fixed arm 39 is released, so that the outer shell 10 is set in an appropriate position, and the connecting rod 31 is withdrawn;

[0076] Check whether all connections are firm and the fuse 70 is correctly connected to the detonation device. After confirmation, remote detonation is performed from a safe distance. During detonation, the explosive force of the source charge 50 spreads along the V-shaped energy-gathering groove 12, forming a high-pressure shock wave and generating a transverse wave.

[0077] Through the above detailed steps, this type of seismic source device can be effectively used for shear wave exploration, accurately controlling the direction and range of the explosion, thereby obtaining high-quality underground structure data.

[0078] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A seismic source device for shear wave exploration, comprising at least one seismic source charge column and a peripheral shell for tightly accommodating the charge column, characterized in that: The seismic charge column has a cylindrical shape, and a focusing cavity is arranged on its side, which is parallel to the cylindrical axis and passes through both ends of the seismic charge column. The cross section of the focusing cavity is V-shaped, and the top angle of the V-shaped cross section faces the axis direction of the seismic charge column. The seismic charge column is loaded in the outer shell; The outer shell is a C-shaped shell with the same number as the source charge and hollow inside. The lower end of the C-shaped shell is closed, and the upper end is fixedly installed with a connecting tube. The upper and lower adjacent C-shaped shells are connected by the connecting tube, and the uppermost connecting tube is also fixedly connected with a connecting seat. The side of the C-shaped shell is also provided with a V-shaped energy gathering groove parallel to the axial direction of the C-shaped shell. The thickness of the C-shaped shell is greater than the thickness of the V-shaped energy gathering groove shell. A V-shaped energy gathering groove shell with a V-shaped cross-section and a thickness less than that of the C-shaped shell is installed on the C-shaped shell in the V-shaped energy gathering groove. The C-shaped shell, the V-shaped energy gathering groove shell and the connecting seat enclose an explosive bin for accommodating the source charge. The diameter of the source charge is equal to the inner wall diameter of the C-shaped shell. The energy gathering cavity formed by it is closely attached to the inner side wall of the V-shaped energy gathering groove shell. The upper and lower ends of the source charge are respectively against the bottom of the connecting seat and the lower end of the C-shaped shell. The opening direction of the V-shaped energy gathering groove of the source charge is the energy gathering direction, and the other parts are the non-energy gathering direction. A detonator for detonating the seismic source charge is also installed in the seismic source charge column, and the lead of the detonator is led outward from the outer shell; When in use, according to the Monroe effect, the detonation energy generated at the explosion center of the seismic charge diffuses outward along the normal direction of the V-shaped energy focusing groove and converges at its central axis, thereby first breaking through the thinner outer shell of the V-shaped energy focusing groove and forming a horizontal transverse wave outward. At the same time, the thickened outer shell in the non-energy focusing direction has a strong restraining effect on the diffusion of the detonation energy, thereby suppressing the release of energy in the non-energy focusing direction and enhancing the convergence of the detonation energy in the direction of the V-shaped energy focusing groove.

2. A seismic source device for shear wave exploration according to claim 1, characterized in that: The interior of the connecting tube is hollow and communicated with the interior of the C-shaped shell. The outer side of the lower end of the C-shaped shell is provided with a connecting external thread, and the inner side of the connecting tube is provided with a connecting internal thread matching the connecting external thread.

3. A seismic source device for shear wave exploration according to claim 2, characterized in that: The connecting seat includes a connecting sleeve with an opening at the lower end. The interior of the connecting sleeve is hollow, and the outer side is also provided with a connecting external thread matching the connecting internal thread. The connecting sleeve is connected to the connecting tube via the connecting external thread. The top of the connecting sleeve is open and has at least two snap seats symmetrically arranged. A snap groove is arranged on the outer side of the snap seat.

4. A seismic source device for shear wave exploration according to claim 3, characterized in that: The connecting seat is also movably provided with a locking mechanism for locking and releasing the connecting seat, the locking mechanism comprising a connecting rod, a limit block is fixed at the bottom of the connecting rod, a limit ring is fixed on the connecting rod above the limit block, a slidable moving ring is sleeved on the connecting rod between the limit ring and the limit block, a spring is sleeved on the connecting rod, one end of the spring is against the moving ring, and the other end is against the limit ring; The connecting rod is symmetrically provided with mounting seats of the same number as the buckle seats on the outside, the upper end of the mounting seats is hinged to the first connecting rod, the lower end is hinged to the second connecting rod, and the other ends of the first connecting rod and the second connecting rod are respectively hinged to the outer side of the limit ring and the outer side of the moving ring; A C-shaped fixing arm is fixed on the mounting seat, the upper end of the fixing arm is fixed to the outer side of the mounting seat, and the bottom is clamped in the clamping groove of the buckle seat.

5. A seismic source device for shear wave exploration according to claim 1 or 4, characterized in that: The C-shaped shell and the V-shaped energy-gathering groove shell are both made of hard PVC material. The thickness of the C-shaped shell ranges from 4mm to 7mm, and the thickness of the V-shaped energy-gathering groove shell is 1mm.

6. A seismic source device for shear wave exploration according to claim 5, characterized in that: The angle degree range of the V-shaped energy focusing groove is 40-70°, and the distance from the cone angle of the V-shaped energy focusing groove to the central axis of the C-shaped shell is 3 / 5*R, where R is the inner radius of the C-shaped shell.

7. A seismic source device for shear wave exploration according to claim 6, characterized in that: Two ear-hanging holes are symmetrically arranged on the side surface of the connecting tube, and the ear-hanging holes penetrate the side wall of the connecting tube.

8. A seismic source device for shear wave exploration according to claim 7, characterized in that: The peripheral shells are provided with at least two groups, and the plurality of peripheral shells are longitudinally connected through the connecting external threads on the outer side of the C-shaped shell and the connecting internal threads on the inner side of the connecting tube.

9. A seismic source device for shear wave exploration according to claim 8, characterized in that: The source device also includes an extension device, which includes an extension rod. A connecting cavity is provided at the bottom of the extension rod, an internal thread is provided on the inner wall of the connecting cavity, and the top of the connecting rod and the top of the extension rod are both provided with external threads that match the internal threads of the inner wall of the connecting cavity.

10. A seismic source device for shear wave exploration according to claim 9, characterized in that: The outer side of the connecting rod and the outer side of the extending rod are both provided with marking strips arranged along the extending direction of the connecting rod.

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