Water coupling blasting hole wall pressure test device and test method

Abstract

The invention discloses a hole wall pressure test device and test method for water coupling blasting, and relates to the technical field of water coupling blasting tests.An isolation structure is located in a hole structure, the interior of the isolation structure is an explosive containing space, the explosive containing space is used for being filled with explosives, and the explosive containing space is used for containing the explosives; a water storage space is formed between the isolation structure and the hole structure and used for being filled with water, a sensor installation support is further arranged between the hole structure and the isolation structure, and the longitudinal pressure sensor is arranged on the sensor installation support. The longitudinal pressure sensor can move between the hole structure and the isolation structure so as to adjust the distance between the longitudinal pressure sensor and the isolation structure in the radial direction, and the circumferential pressure sensor is arranged on the inner wall of the hole structure. According to the invention, the collection of hole wall pressure related data can be realized, and the device is further used for researching the water coupling blasting process.

Description

Technical Field

[0001] This invention relates to the field of water-coupled blasting test technology, and in particular to a device and method for testing the pressure of water-coupled blasting borehole walls. Background Technology

[0002] In blasting engineering, improving blasting energy utilization, enhancing rock-breaking effects, and reducing blasting costs have always been pressing issues. With the increasing use of high-power water-resistant explosives (such as water-gel explosives and emulsion explosives), adding water to boreholes to improve blasting performance has become possible. Water-coupled blasting utilizes water as a carrier of explosive energy, altering the propagation pattern of the blast shock wave and the peak stress-strain ratio, thereby influencing the blasting effect and effectively improving blasting efficiency while reducing blasting material consumption.

[0003] Advantages of water-coupled blasting: Water-coupled blasting offers advantages such as low vibration intensity, low noise, uniform fragment size, and easy control of flyrock. Furthermore, water is far less compressible than air, but denser, and the expansion rate of detonation products in water is slower than in air. This results in significant differences in the duration and intensity of the shock wave from an underwater explosion, as well as the field strength and distribution of the explosive stress field in the surrounding rock, compared to uncoupled air-charge blasting, making it more conducive to rock fragmentation.

[0004] The peak borehole wall pressure is a crucial parameter for optimizing blasting parameters and analyzing the impact dynamic response of non-fluid-structure interaction blasts. Explosive properties, decoupling coefficients, and borehole wall rock conditions all significantly influence the peak borehole wall pressure. Therefore, in-depth research is needed on the relevant characteristics of borehole wall pressure during water-coupled blasting to provide theoretical support for blasting parameter optimization.

[0005] Limitations of existing technology: Although water-coupled blasting has many advantages, its application in engineering projects has not been widely promoted due to the blasting mechanism of the charge structure and the difficulty of on-site implementation. Therefore, it is necessary to conduct in-depth research on the mechanism of water-coupled blasting through experimental devices to improve the charge technology and promote its application in engineering practice. Summary of the Invention

[0006] The purpose of this invention is to provide a device and method for testing the pressure of the borehole wall in water-coupled blasting, so as to solve the problems existing in the prior art, realize the acquisition of borehole wall pressure-related data, and then use it to study the water-coupled blasting process.

[0007] To achieve the above objectives, the present invention provides the following solution:

[0008] This invention provides a device for testing the pressure of a water-coupled blasting borehole wall, comprising: a borehole structure, an isolation structure, a longitudinal pressure sensor, and a circumferential pressure sensor. The isolation structure is located within the borehole structure, and the interior of the isolation structure is a space for placing explosives. The explosive space is used to fill explosives. A water storage space is located between the isolation structure and the borehole structure, and the water storage space is used to fill water. A sensor mounting bracket is also provided between the borehole structure and the isolation structure. The longitudinal pressure sensor is mounted on the sensor mounting bracket and is movable between the borehole structure and the isolation structure to adjust the radial distance between the longitudinal pressure sensor and the isolation structure. The circumferential pressure sensor is disposed on the inner wall of the borehole structure.

[0009] In some specific designs, the upper end of the isolation structure is provided with an opening, and the lower end of the isolation structure is sealed to the hole structure; the isolation structure and the hole structure are coaxially arranged.

[0010] In some specific embodiments, the sensor mounting bracket includes a first radial guide rail structure, a second radial guide rail structure, and a support structure. One end of the first radial guide rail structure is connected to the isolation structure, and the other end of the first radial guide rail structure is connected to the hole structure. One end of the second radial guide rail structure is connected to the isolation structure, and the other end of the second radial guide rail structure is connected to the hole structure. Both ends of the support structure are slidably connected to the first radial guide rail structure and the second radial guide rail structure, respectively. The longitudinal pressure sensor is mounted on the support structure.

[0011] In some specific embodiments, the first radial guide rail structure includes a plurality of first radial guide rails evenly distributed circumferentially along the isolation structure, the second radial guide rail structure includes a plurality of second radial guide rails evenly distributed circumferentially along the isolation structure, and the support structure includes a plurality of support rods evenly distributed circumferentially along the isolation structure. The first radial guide rail, the second radial guide rail, and the support rods correspond one-to-one. One end of each support rod is provided with a first slider, which is slidably connected to the first radial guide rail. The other end of each support rod is provided with a second slider, which is slidably connected to the second radial guide rail. Each support rod is provided with a longitudinal pressure sensor, which extends from one end of the support rod to the other end.

[0012] In some specific embodiments, the circumferential pressure sensor extends circumferentially along the inner wall of the hole structure to form a ring structure.

[0013] In some specific embodiments, several of the circumferential pressure sensors are evenly distributed along the length of the hole structure on the inner wall of the hole structure.

[0014] In some specific designs, a pressure relief valve and a safety valve are provided at the upper end of the hole structure, and the detonation wire of the explosive can pass through the upper end of the hole structure.

[0015] In some specific embodiments, the sidewall of the hole structure is provided with a wire channel through which the wires of the longitudinal pressure sensor and the circumferential pressure sensor pass, and the outer wall of the hole structure is provided with a signal collection interface, which is connected to the wires.

[0016] In some specific embodiments, the hole structure includes a hole structure body, an upper end cap, and a lower end cap. Both ends of the hole structure body are provided with openings. The upper end cap is used to close the opening at the upper end of the hole structure body, and the lower end cap is used to close the opening at the lower end of the hole structure body.

[0017] The present invention also discloses a test method using the aforementioned water-coupled blast hole wall pressure test device, comprising:

[0018] Explosives were placed in the isolation structure, the positions of the longitudinal pressure sensors were adjusted, water was filled between the isolation structure and the hole structure, and the hole structure was sealed.

[0019] Detonate the explosives;

[0020] Each longitudinal pressure sensor collects borehole wall pressure data under different water coupling coefficients during a single blast, and each circumferential pressure sensor collects borehole wall pressure data at different borehole wall positions during a single blast.

[0021] By fitting and analyzing the data from each longitudinal pressure sensor and each circumferential pressure sensor, the distribution patterns of pore wall pressure under different water coupling coefficients and at different pore wall positions were obtained.

[0022] The present invention achieves the following technical effects compared to the prior art:

[0023] The isolation structure of this invention isolates the explosive from the water. A longitudinal pressure sensor is mounted on a sensor mounting bracket, and its position is adjustable, allowing for pressure measurement at different distances from the explosive in the water. A circumferential pressure sensor measures the pressure at the borehole wall. By studying the data obtained from the longitudinal and circumferential pressure sensors, relevant parameters of the borehole wall pressure can be determined, helping to accurately grasp the mechanical characteristics during the blasting process. This ensures that blasting operations are conducted within a safe and controllable range, reducing safety accidents caused by blasting and protecting the safety of personnel and facilities. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of a water-coupled blast hole wall pressure testing device according to some embodiments of the present invention;

[0026] Figure 2 This is a cross-sectional view of a water-coupled blast hole wall pressure testing device according to some embodiments of the present invention.

[0027] Figure 3 This is a top view of the isolation structure, hole structure, and sensor mounting bracket in some embodiments of the present invention;

[0028] Figure 4 This is a schematic diagram of the isolation structure and sensor mounting bracket in some embodiments of the present invention;

[0029] Figure 5 This is a schematic diagram of the hole structure and circumferential pressure sensor in some embodiments of the present invention;

[0030] In the diagram: 1-Isolation structure, 2-Longitudinal pressure sensor, 3-Circumferential pressure sensor, 4-Explosive placement space, 5-Water storage space, 6-First radial guide rail, 7-Second radial guide rail, 8-Support rod, 9-First slider, 10-Second slider, 11-Pressure relief valve, 12-Detonation wire, 13-Collection interface, 14-Wire channel, 15-Hole structure body, 16-Upper end cover, 17-Lower end cover, 18-Flange, 19-Bolt, 20-Safety valve. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] The purpose of this invention is to provide a device and method for testing the pressure of the borehole wall in water-coupled blasting, so as to solve the problems existing in the prior art, realize the acquisition of borehole wall pressure-related data, and then use it to study the water-coupled blasting process.

[0033] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] Example 1

[0035] like Figures 1 to 5 As shown, this embodiment provides a device for testing the pressure of a water-coupled blasting borehole wall, including: a borehole structure, an isolation structure 1, a longitudinal pressure sensor 2, and a circumferential pressure sensor 3. The isolation structure 1 is located within the borehole structure, and its interior is a space 4 for placing explosives. The space 4 is used to fill explosives. A water storage space 5 is located between the isolation structure 1 and the borehole structure, and is used to fill water. A sensor mounting bracket is also provided between the borehole structure and the isolation structure 1. The longitudinal pressure sensor 2 is mounted on the sensor mounting bracket and can move between the borehole structure and the isolation structure 1 to adjust the radial distance between them. The circumferential pressure sensor 3 is mounted on the inner wall of the borehole structure. In this embodiment, the isolation structure 1 isolates the explosives from the water. The longitudinal pressure sensor 2 is mounted on the sensor mounting bracket, and its position is adjustable, allowing for the measurement of pressure at different locations in the water relative to the explosives. The circumferential pressure sensor 3 is used to measure the pressure at the borehole wall. By studying the relevant parameters of borehole wall pressure using data obtained from longitudinal pressure sensor 2 and circumferential pressure sensor 3, it is helpful to accurately grasp the mechanical characteristics of the blasting process, ensure that blasting operations are carried out within a safe and controllable range, reduce safety accidents caused by blasting, and protect the safety of engineering personnel and facilities.

[0036] In some specific embodiments, the isolation structure 1 is made of polystyrene (PS). The upper end of the isolation structure 1 is provided with an opening, and the lower end of the isolation structure 1 is sealed to the hole structure. The isolation structure 1 can ensure the separation of water and explosives. When filling with explosives, it ensures that the explosives are tightly attached to the inner wall of the isolation structure 1 without gaps.

[0037] In some specific embodiments, the isolation structure 1 is coaxially arranged with the hole structure.

[0038] In some specific embodiments, the sensor mounting bracket includes a first radial guide rail 6 structure, a second radial guide rail 7 structure, and a support structure. One end of the first radial guide rail 6 structure is connected to the isolation structure 1, and the other end of the first radial guide rail 6 structure is connected to the hole structure. One end of the second radial guide rail 7 structure is connected to the isolation structure 1, and the other end of the second radial guide rail 7 structure is connected to the hole structure. Both ends of the support structure are slidably connected to the first radial guide rail 6 structure and the second radial guide rail 7 structure, respectively. The longitudinal pressure sensor 2 is mounted on the support structure.

[0039] In some specific embodiments, the first radial guide rail 6 structure includes a plurality of first radial guide rails 6 evenly distributed circumferentially along the isolation structure 1, the second radial guide rail 7 structure includes a plurality of second radial guide rails 7 evenly distributed circumferentially along the isolation structure 1, and the support structure includes a plurality of support rods 8 evenly distributed circumferentially along the isolation structure 1. The first radial guide rails 6, the second radial guide rails 7 and the support rods 8 correspond one-to-one. One end of the support rod 8 is provided with a first slider 9, which is slidably connected to the first radial guide rail 6. The other end of the support rod 8 is provided with a second slider 10, which is slidably connected to the second radial guide rail 7. Each support rod 8 is provided with a longitudinal pressure sensor 2, and the longitudinal pressure sensor 2 is located on the side of the support rod 8 facing the isolation structure 1. The longitudinal pressure sensor 2 extends from one end of the support rod 8 to the other end of the support rod 8.

[0040] In some specific embodiments, the first radial guide rail 6, the second radial guide rail 7, the first slider 9, the second slider 10, and the support rod 8 are all made of austenitic stainless steel. The first radial guide rail 6, the second radial guide rail 7, the first slider 9, the second slider 10, and the support rod 8 are not only used to adjust the position of the longitudinal pressure sensor 2, but also are part of the signal transmission path of the longitudinal pressure sensor 2.

[0041] In some embodiments, the circumferential pressure sensor 3 extends circumferentially along the inner wall of the hole structure to form a ring structure.

[0042] In some specific embodiments, a plurality of circumferential pressure sensors 3 are evenly distributed on the inner wall of the hole structure along the length of the hole structure.

[0043] In some specific embodiments, both the longitudinal pressure sensor 2 and the circumferential pressure sensor 3 are PVDF sensors. The core component of the PVDF sensor is a PVDF film with a thickness of 5 to 50 μm. Copper or gold electrodes are deposited on the upper and lower surfaces of the PVDF film to form a "sandwich" structure. The outer layer is wrapped with a wear-resistant polymer (such as polyurethane) or metal mesh to prevent scratches on the PVDF film during installation. The edge is integrated with a shielded cable (such as a coaxial cable) to reduce electromagnetic interference.

[0044] In some specific embodiments, a pressure relief valve 11 and a safety valve 20 are provided at the upper end of the hole structure, and the detonation wire 12 of the explosive can pass through the upper end of the hole structure.

[0045] In some specific embodiments, the sidewall of the hole structure is provided with a wire channel 14 through which the wires of the longitudinal pressure sensor 2 and the circumferential pressure sensor 3 pass, and the outer wall of the hole structure is provided with a signal collection interface 13, which is connected to the wires.

[0046] In some specific embodiments, the hole structure includes a hole structure body 15, an upper end cover 16, and a lower end cover 17. Both ends of the hole structure body 15 have openings. Flanges 18 are respectively provided at the upper and lower ends of the hole structure body 15. The hole structure body 15 and flanges 18 are integrally cast or forged, resulting in high strength and excellent sealing performance, suitable for harsh working conditions such as high pressure, high vacuum, and highly toxic media. The hole structure body 15 and flanges 18 are made of alloy steel, preferably a seamless steel pipe made of high manganese steel to ensure the durability of the equipment. The upper end cover 16 is connected to the flange 18 at the upper end of the hole structure body 15 by bolts 19 to seal the opening at the upper end of the hole structure body 15. The lower end cover 17 is connected to the flange 18 at the lower end of the hole structure body 15 by bolts 19 to seal the opening at the lower end of the hole structure body 15. An annular groove is provided on the surface of the flange 18. The cross-section of the annular groove is trapezoidal or elliptical. An annular metal gasket is provided inside the annular groove. The size and angle of the annular metal gasket match the annular groove to achieve a sealed connection.

[0047] This embodiment designs a water-coupled environment experimental system for explosives, solving the problem of poor experimental results in traditional borehole pressure testing equipment for water-coupled blasting. Particularly when dealing with the fixed coupling position of the water medium and the explosive, this embodiment addresses this issue by mounting the longitudinal pressure sensor 2 on a sensor mounting bracket, allowing adjustment of the distance between the longitudinal pressure sensor 2 and the isolation structure 1. The position of the longitudinal pressure sensor 2 can be changed according to experimental requirements, overcoming the limited parameter adjustment range and poor media adaptability of traditional borehole pressure testing equipment. Several circumferential pressure sensors 3 facilitate the measurement of borehole pressure at different locations, making the experimental equipment more flexible and efficient, and providing convenience for establishing control groups. This embodiment achieves higher data collection efficiency, reduces experimental costs and time, and improves economic benefits by uniformly arranging the longitudinal pressure sensors 2 and circumferential pressure sensors 3. This embodiment uses concealed wires for signal transmission, solving the problem of incomplete data collection caused by damage to the wires during blasting.

[0048] Example 2

[0049] This embodiment discloses a test method using the water-coupled blast hole wall pressure test device of Embodiment 1, including:

[0050] Check if the detonation circuit and sensor circuit are normal. Place explosives in the isolation structure 1, adjust the position of each longitudinal pressure sensor 2, fill water between the isolation structure 1 and the hole structure, seal the bolt 19 hole structure, check its airtightness, and complete the equipment assembly.

[0051] The explosive is ignited by the detonating wire 12;

[0052] Each longitudinal pressure sensor 2 collects borehole wall pressure data under different water coupling coefficients during a single blast, and each circumferential pressure sensor 3 collects borehole wall pressure data at different borehole wall positions during a single blast.

[0053] By fitting and analyzing the data from each longitudinal pressure sensor 2 and each circumferential pressure sensor 3, the distribution patterns of pore wall pressure under different water coupling coefficients and at different pore wall positions are obtained.

[0054] In the description of this invention, it should be understood that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0055] In the description of this invention, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0056] If this invention discloses or relates to components or structural parts that are fixedly connected to each other, then, unless otherwise stated, a fixed connection can be understood as: a fixed connection that can be detached (e.g., using bolts or screws), or a fixed connection that cannot be detached (e.g., riveting, welding). Of course, a fixed connection can also be replaced by an integral structure (e.g., manufactured in one piece using a casting process) (except where it is obviously impossible to use an integral molding process).

[0057] In addition, unless otherwise stated, the terms used in any of the technical solutions disclosed in this invention to indicate positional relationships or shapes include states or shapes that are similar to, close to, or approximate with those states or shapes.

[0058] Any component provided by this invention can be assembled from multiple individual components or can be a single component manufactured by a one-piece molding process.

[0059] It should be noted that the structures, proportions, sizes, etc., depicted in the accompanying drawings of this specification are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0060] It should also be noted that in the embodiments of this application, the same reference numerals are used to denote the same component or the same part.

[0061] Any adaptive changes made according to actual needs are within the scope of protection of this invention.

[0062] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A device for testing the wall pressure of a water-coupled blasting borehole, characterized in that: include: The device comprises a bore structure, an isolation structure, a longitudinal pressure sensor, and a circumferential pressure sensor. The isolation structure is located within the bore structure and has an explosive placement space for filling explosives. A water storage space is located between the isolation structure and the bore structure and is filled with water. A sensor mounting bracket is also provided between the bore structure and the isolation structure, and the longitudinal pressure sensor is mounted on the mounting bracket. The longitudinal pressure sensor is movable between the bore structure and the isolation structure to adjust the radial distance between the longitudinal pressure sensor and the isolation structure. The circumferential pressure sensor is located on the inner wall of the bore structure.

2. The device for testing the wall pressure of a water-coupled blast hole according to claim 1, characterized in that: The upper end of the isolation structure is provided with an opening, and the lower end of the isolation structure is sealed to the hole structure; the isolation structure and the hole structure are arranged coaxially.

3. The device for testing the pressure of a water-coupled blast hole wall according to claim 1, characterized in that: The sensor mounting bracket includes a first radial guide rail structure, a second radial guide rail structure, and a support structure. One end of the first radial guide rail structure is connected to the isolation structure, and the other end of the first radial guide rail structure is connected to the hole structure. One end of the second radial guide rail structure is connected to the isolation structure, and the other end of the second radial guide rail structure is connected to the hole structure. Both ends of the support structure are slidably connected to the first radial guide rail structure and the second radial guide rail structure, respectively. The longitudinal pressure sensor is mounted on the support structure.

4. The device for testing the pressure of a water-coupled blast hole wall according to claim 3, characterized in that: The first radial guide rail structure includes a plurality of first radial guide rails evenly distributed circumferentially along the isolation structure; the second radial guide rail structure includes a plurality of second radial guide rails evenly distributed circumferentially along the isolation structure; the support structure includes a plurality of support rods evenly distributed circumferentially along the isolation structure; the first radial guide rails, the second radial guide rails, and the support rods correspond one-to-one; one end of each support rod is provided with a first slider, which is slidably connected to the first radial guide rail; the other end of each support rod is provided with a second slider, which is slidably connected to the second radial guide rail; and each support rod is provided with a longitudinal pressure sensor, which extends from one end of the support rod to the other end of the support rod.

5. The device for testing the wall pressure of a water-coupled blast hole according to claim 1, characterized in that: The circumferential pressure sensor extends circumferentially along the inner wall of the hole structure to form a ring structure.

6. The device for testing the wall pressure of a water-coupled blast hole according to claim 1, characterized in that: Several of the circumferential pressure sensors are evenly distributed on the inner wall of the hole structure along the length of the hole structure.

7. The device for testing the wall pressure of a water-coupled blast hole according to claim 1, characterized in that: The upper end of the hole structure is equipped with a pressure relief valve and a safety valve, and the detonation wire of the explosive can pass through the upper end of the hole structure.

8. The device for testing the wall pressure of a water-coupled blast hole according to claim 1, characterized in that: The sidewall of the hole structure is provided with a wire channel through which the wires of the longitudinal pressure sensor and the circumferential pressure sensor pass. The outer wall of the hole structure is provided with a signal collection interface, which is connected to the wires.

9. The device for testing the wall pressure of a water-coupled blast hole according to claim 1, characterized in that: The hole structure includes a hole structure body, an upper end cap, and a lower end cap. Both ends of the hole structure body are provided with openings. The upper end cap is used to close the opening at the upper end of the hole structure body, and the lower end cap is used to close the opening at the lower end of the hole structure body.

10. A test method using the water-coupled blast hole wall pressure test apparatus as described in any one of claims 1-9, characterized in that: include: Explosives were placed in the isolation structure, the positions of the longitudinal pressure sensors were adjusted, water was filled between the isolation structure and the hole structure, and the hole structure was sealed. Detonate the explosives; Each longitudinal pressure sensor collects borehole wall pressure data under different water coupling coefficients during a single blast, and each circumferential pressure sensor collects borehole wall pressure data at different borehole wall positions during a single blast. By fitting and analyzing the data from each longitudinal pressure sensor and each circumferential pressure sensor, the distribution patterns of pore wall pressure under different water coupling coefficients and at different pore wall positions were obtained.

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