Device for measuring water pressure change in specimen under Hopkinson bar load and method of use

Abstract

The present application provides a device for measuring changes in water pressure inside a sample under a Hopkinson bar load and a method for using the device. The device comprises a base, a clamp detachable from the base, a pressure measuring device detachable from the clamp, and a sleeve sleeved on the base. The device can be arranged between the incident rod and the transmission rod of the Hopkinson bar to measure changes in water pressure inside the sample under the impact load of the Hopkinson bar and understand the law of change of water pressure inside the sample. The device has the advantages of simple structure, easy disassembly, intuitive observation of experimental data, and ability to perform various experimental tests.

Description

Technical Field

[0001] The present application belongs to the field of experimental equipment for dynamic mechanical properties of materials, and specifically relates to a device for measuring changes in water pressure inside a sample under a Hopkinson bar load. Background Art

[0002] Most projects, such as roadway or tunnel projects, will encounter water inside the rock mass. This water inside the rock mass will exert a certain amount of water pressure on the surrounding rock mass, undermining its stability. During the roadway or tunnel excavation process, the impact load caused by blasting and excavation will act on the internal water, causing the water pressure to change. When the water pressure becomes too high, it will cause the rock mass to fracture. Currently, most research analyzes the condition of rocks after hydraulic fracturing. Little is known about the changes in internal water pressure under impact loads and their laws. Therefore, there is an urgent need for an experimental device that can simulate, measure, and understand the changes in water pressure under impact loads before operation, which is of great significance to actual engineering construction. Summary of the Invention

[0003] In order to solve the technical problems in existing projects such as the lack of understanding of the water pressure changes under impact loads, unclear water pressure change laws, and inability to simulate actual projects, this application proposes a device for measuring the water pressure changes inside a sample under Hopkinson bar load.

[0004] The present application adopts the following scheme: a device for measuring the change in water pressure inside a sample under a Hopkinson bar load, comprising a sleeve, a base being provided at one end of the sleeve, a clamp being provided on the base and being located on the inner side of the sleeve, a pressure measuring device for measuring pressure being fixed on the clamp, and a top cover for sealing or a pressurizing device for applying pressure being provided at the other end of the sleeve.

[0005] Preferably, the output line of the pressure measuring device passes through the base and is connected to the outside world.

[0006] Preferably, the pressure measuring device is provided with a plurality of;

[0007] The base is provided with a bus groove, and the side wall of the base is provided with a plurality of outlet grooves respectively connected to the bus groove.

[0008] Preferably, the base includes a first base and a second base that are connected, the first base is provided with a wire hole passing through it, the upper surface of the second base is provided with a wire groove, the wire hole and the wire groove together form the bus groove, the lower surface of the first base is provided with a plurality of first guide grooves, the upper surface of the second base is provided with a plurality of second guide grooves corresponding to the first guide grooves, the first guide groove and the second guide groove together form the lead-out groove.

[0009] Preferably, an inserting slot for inserting the clamp is provided on the upper end surface of the base.

[0010] Preferably, the pressurizing device is a hydraulic pump, and the oil outlet of the hydraulic pump is connected to the interior of the sleeve.

[0011] Preferably, the clamp includes a first clamp and a second clamp that are arranged opposite to each other, a plurality of clamp sleeves for fixing are provided on the outer periphery of the first clamp and the second clamp, and the pressure measuring device is clamped between the first clamp and the second clamp.

[0012] Preferably, grooves for accommodating the pressure measuring device are formed in the middle of the first clamp and the second clamp, and mounting holes for mounting the pressure measuring device are formed in the grooves.

[0013] Preferably, the clamp is arranged along the length direction of the sleeve, and a plurality of pressure measuring devices are arranged at intervals along the length direction of the clamp.

[0014] Another object of the present application is to provide a method for using a device for measuring changes in water pressure inside a specimen under a Hopkinson bar load. The present application adopts the following scheme:

[0015] A method for using a device for measuring changes in water pressure inside a sample under a Hopkinson bar load comprises the following steps:

[0016] Step 1. After fixing the pressure measuring device on the fixture, place the fixture on the base, and then put the sleeve on the base;

[0017] Step 2. Lead the output line of the pressure measuring device out from the inside of the sleeve and connect it to the monitor;

[0018] Step 3. If the sleeve does not require initial pressure, fill the sleeve with water and install a top cover on the sleeve. If the sleeve requires initial pressure, install a pressurizing device on the sleeve and inject oil into the sleeve and pressurize it through the pressurizing device.

[0019] Step 4. Place the installed and connected device for measuring the change in water pressure inside the sample under the Hopkinson bar load between the incident rod and the transmission rod of the Hopkinson bar;

[0020] Step 5. Start the Hopkinson bar and measure the change in water pressure inside the specimen under the Hopkinson bar load. After the device is subjected to pressure, monitor the change in pressure inside the sleeve.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] The present application provides a device for measuring the change in water pressure inside a sample under a Hopkinson bar load, comprising a base, a clamp detachable from the base, a pressure measuring device detachable from the clamp, and a sleeve sleeved on the base. The device can be arranged between the incident rod and the transmission rod of the Hopkinson bar, and measures the change in water pressure inside the sample under the impact load of the Hopkinson bar, so as to understand the change law of water pressure inside the sample. The device has the advantages of simple structure, easy disassembly, intuitive observation of experimental data, and ability to conduct various experimental tests.

[0023] The present application provides a method for using a device for measuring changes in water pressure inside a sample under a Hopkinson bar load. The method comprises the following steps: placing a pressure measuring device on a fixture, placing the fixture on a base, and finally placing a sleeve on the base and using the sleeve together with the Hopkinson bar to measure changes in water pressure inside the sample under the impact load of the Hopkinson bar and understand the changing law of water pressure inside the sample. The method has a simple use process, is easy to operate, and is easy to promote and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments.

[0025] Figure 1 It is a structural schematic diagram of a device for measuring changes in water pressure inside a sample under a Hopkinson bar load according to an embodiment of the present application.

[0026] Figure 2 3D views of the first base of the device for measuring the change in water pressure inside a sample under a Hopkinson bar load according to an embodiment of the present application.

[0027] Figure 3 3D views of the second base of the device for measuring the change in water pressure inside a sample under a Hopkinson bar load according to an embodiment of the present application.

[0028] Figure 4 It is a structural diagram and a side view of the fixture of the device for measuring the change of water pressure inside a sample under the Hopkinson bar load in an embodiment of the present application. DETAILED DESCRIPTION

[0029] like Figure 1-4 As shown, a device for measuring the change in water pressure inside a sample under a Hopkinson bar load is characterized in that it includes a sleeve 1, a base 2 is provided at one end of the sleeve 1, a clamp 3 located on the inner side of the sleeve 1 is provided on the base 2, a pressure measuring device 4 for measuring pressure is fixed on the clamp 3, and a top cover 5 for sealing or a pressurizing device 6 for applying pressure is provided at the other end of the sleeve 1. A sealing gasket is also provided between the sleeve 1, the base 2 and the top cover 5 or the pressurizing device 6 to ensure the airtightness of the entire device, and the device is made of impact-resistant material.

[0030] The present application provides a device for measuring the change in water pressure inside a sample under a Hopkinson pressure bar load, comprising a sleeve, a base, a clamp, a top cover, and a pressure measuring device provided on the clamp. The device has the advantages of simple structure, easy disassembly, intuitive observation of experimental data, and ability to perform a variety of experimental tests.

[0031] Preferably, the output line 40 of the pressure measuring device 4 passes through the base 2 to be connected to an external monitor. More preferably, the monitor is a computer, which can monitor the internal pressure changes of the sleeve 1 through the computer to simulate the changes in the internal pressure of the test piece after being pressurized.

[0032] Preferably, a bus groove 20 is provided on the base 2, and a plurality of lead-out grooves 21 respectively connected to the bus groove 20 are provided on the side wall of the base 2. The plurality of lead-out grooves 21 can be used to respectively lead out the plurality of output lines 40 of the pressure measuring device 4. During the experiment, the plurality of output lines 40 are passed through the bus groove 20 and then passed out from the lead-out groove 21 to the outside of the sleeve 1. After being connected to the computer, the computer outside the sleeve 1 can receive the water pressure change information in the sleeve 1. The structure is simple, the disassembly is convenient, and the experimental data can be observed intuitively.

[0033] Preferably, the base 2 includes a first base 22 and a second base 23 that are connected. The first base 22 is provided with a wire hole 220 that passes through it, and the upper surface of the second base 23 is provided with a wire groove 230. The wire hole 220 and the wire groove 230 together form the bus groove 20. The lower surface of the first base 22 is provided with a plurality of first guide grooves 221, and the upper surface of the second base 23 is provided with a plurality of second guide grooves 231 corresponding to the first guide grooves 221. The first guide grooves 221 and the second guide grooves 231 together form the lead-out groove 21. During the experiment, after passing a plurality of output lines 40 through the wire hole 220 of the first base 22 and placing the output line 40 in the first guide groove 221, the second base 23 is installed, and the transmission line 40 passes through the lead-out groove 21 and is connected to the computer outside the sleeve 1 to realize the transmission of pressure information. The present application has a simple structure, is easy to disassemble, and the experimental data can be observed intuitively.

[0034] Preferably, a plug-in slot 222 for inserting the clamp 3 is provided on the upper end surface of the first base 22, and the plug-in method can also be replaced with but not limited to other detachable connection methods such as snap connection, screw connection, etc. The present application has a simple structure, is easy to disassemble, and the experimental data can be observed intuitively.

[0035] Preferably, the pressurizing device 6 is a hydraulic pump, and the oil outlet of the hydraulic pump is connected to the interior of the sleeve 1. If initial pressure is required inside the sleeve 1 during the experiment, the hydraulic pump can inject oil into the sleeve 1 and apply oil pressure to simulate the situation where the experimental piece has initial pressure inside.

[0036] Preferably, the clamp 3 includes a first clamp 30 and a second clamp 31 arranged relatively to each other, and a plurality of clamp sleeves 34 for fixing are sleeved on the outer periphery of the first clamp 30 and the second clamp 31. The pressure measuring device 4 is clamped between the first clamp 30 and the second clamp 31. The structure is simple, the pressure measuring device 4 is easy to disassemble, and the installation of the clamp sleeve 34 improves the overall installation strength, facilitates user operation, and the experimental data can be observed intuitively.

[0037] Preferably, the first clamp 30 and the second clamp 31 are both provided with grooves 32 in the middle for accommodating the pressure measuring device 4. The groove 32 is provided with a mounting hole 33 for installing the pressure measuring device 4. The pressure measuring device 4 is fixed on the mounting hole 33. Under the pressure of the Hopkinson bar, the pressure measuring device 4 is not easy to loosen, and the internal pressure of the sleeve 1 can be continuously measured to ensure the experimental accuracy.

[0038] The clamp 3 is arranged along the length direction of the sleeve 1, and multiple pressure measuring devices 4 are arranged at intervals along the length direction of the clamp 3. The multiple pressure measuring devices 4 arranged at intervals along the length direction can monitor the pressure changes at multiple positions inside the sleeve 1, thereby improving the accuracy and universality of the experiment.

[0039] Preferably, a method for using a device for measuring changes in water pressure inside a sample under a Hopkinson bar load comprises the following steps:

[0040] Step 1. Place the pressure measuring device 4 in the groove 32 of the first clip 30 and the second clip 31. After positioning it through the mounting hole 33, use screws to secure the pressure measuring device 4 to the mounting hole 33. Slide the clamp sleeve 34 over the outer periphery of the first clip 30 and the second clip 31. Insert the clamp 3 for mounting the pressure measuring device 4 into the insertion slot 222 of the base 2. Finally, slide the sleeve 1 onto the base 2.

[0041] Step 2. Lead the output line 40 of the pressure measuring device 4 from the inside of the sleeve 1 along the bus groove 20 and the lead-out groove 21 on the base 2 and connect it to the computer outside the sleeve 1;

[0042] Step 3. If initial pressure is not required in the sleeve 1, the sleeve 1 is filled with water and the top cover 5 is installed on the sleeve 1. If initial pressure is required in the sleeve 1, the pressurizing device 6 is installed on the sleeve 1 and oil is injected into the sleeve 1 through the pressurizing device 6 to apply pressure.

[0043] Step 4. Place the installed and connected device for measuring the change in water pressure inside the sample under the Hopkinson bar load between the incident rod and the transmission rod of the Hopkinson bar;

[0044] Step 5. Start the Hopkinson bar and measure the change in water pressure inside the sample under the Hopkinson bar load. After the device is subjected to pressure, use a computer to monitor the change in pressure inside the sleeve 1.

[0045] The present application provides a method for using a device for measuring changes in water pressure inside a sample under a Hopkinson bar load. The device has a simple installation process, is easy to operate, and is convenient for popularization and use. After the Hopkinson bar is started, the test piece simulates a working rock mass, and the device for measuring changes in water pressure inside a sample under a Hopkinson bar load simulates the moisture contained in the rock mass. The device has simple operation, is easy to implement, has low cost, and is convenient for mass production and promotion.

[0046] 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 and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A device for measuring the change in water pressure inside a sample under a Hopkinson bar load, characterized in that: The invention comprises a sleeve (1), wherein one end of the sleeve (1) is provided with a base (2), the base (2) is provided with a clamp (3) located inside the sleeve (1), the clamp (3) is fixed with a pressure measuring device (4) for measuring pressure, and the other end of the sleeve (1) is provided with a top cover (5) for sealing or a pressurizing device (6) for applying pressure; The output line (40) of the pressure measuring device (4) passes through the base (2) and is connected to the outside world; The pressure measuring devices (4) are provided in plurality; a bus slot (20) is provided on the base (2); a plurality of lead-out slots (21) are provided on the side wall of the base (2) and are respectively connected to the bus slot (20); the plurality of lead-out slots (21) are used to correspondingly lead out output lines (40) of the plurality of pressure measuring devices (4); The clamp (3) comprises a first clamp (30) and a second clamp (31) arranged opposite to each other, a plurality of clamp sleeves (34) for fixing are sleeved around the outer periphery of the first clamp (30) and the second clamp (31), and the pressure measuring device (4) is clamped between the first clamp (30) and the second clamp (31); The first clamping piece (30) and the second clamping piece (31) are both provided with grooves (32) in the middle thereof for accommodating the pressure measuring device (4), and the grooves (32) are provided with mounting holes (33) for mounting the pressure measuring device (4); The clamp (3) is arranged along the length direction of the sleeve (1), and a plurality of pressure measuring devices (4) are arranged at intervals along the length direction of the clamp (3).

2. The device for measuring the change in water pressure inside a sample under a Hopkinson bar load according to claim 1, characterized in that: The base (2) comprises a first base (22) and a second base (23) connected to each other, the first base (22) being provided with a through-hole (220), the upper surface of the second base (23) being provided with a wire groove (230), the wire hole (220) and the wire groove (230) jointly forming the bus groove (20), the lower surface of the first base (22) being provided with a plurality of first guide grooves (221), the upper surface of the second base (23) being provided with a plurality of second guide grooves (231) corresponding to the first guide grooves (221), the first guide grooves (221) and the second guide grooves (231) jointly forming the lead-out groove (21).

3. The device for measuring the change in water pressure inside a sample under a Hopkinson bar load according to claim 1, characterized in that: The upper end surface of the base (2) is provided with a plug-in slot (222) for inserting the clamp (3).

4. The device for measuring the change in water pressure inside a sample under Hopkinson bar load according to claim 1, characterized in that: The pressurizing device (6) is a hydraulic pump, and the oil outlet of the hydraulic pump is connected to the interior of the sleeve (1).

5. A method for using the device for measuring the change in water pressure inside a sample under a Hopkinson bar load according to any one of claims 1 to 4, characterized in that: The method of use comprises the following steps: Step 1. After fixing the pressure measuring device (4) on the fixture (3), place the fixture (3) on the base (2), and then sleeve the sleeve (1) on the base (2); Step 2. Lead the output line (40) of the pressure measuring device (4) out from the inside of the sleeve (1) and connect it to the monitor; Step 3. If the sleeve (1) does not require initial pressure, the sleeve (1) is filled with water and the top cover (5) is installed on the sleeve (1). If the sleeve (1) requires initial pressure, the pressure device (6) is installed on the sleeve (1) and oil is injected into the sleeve (1) and pressurized through the pressure device (6); Step 4. Place the installed and connected device for measuring the change in water pressure inside the sample under the Hopkinson bar load between the incident rod and the transmission rod of the Hopkinson bar; Step 5. Start the Hopkinson bar and measure the change in water pressure inside the sample under the Hopkinson bar load. After the device is subjected to pressure, monitor the change in pressure inside the sleeve (1).

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