CN111122778A - Testing device for radial expansion pressure of static bursting agent and using method - Google Patents
Testing device for radial expansion pressure of static bursting agent and using method Download PDFInfo
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- CN111122778A CN111122778A CN201911337563.9A CN201911337563A CN111122778A CN 111122778 A CN111122778 A CN 111122778A CN 201911337563 A CN201911337563 A CN 201911337563A CN 111122778 A CN111122778 A CN 111122778A
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- rubber sleeve
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
Abstract
A testing device for radial expansion pressure of a static swelling agent and a using method belong to the technical field of static swelling agent expansion pressure testing, and can solve the problem that the radial expansion pressure of the wall of a drill hole is difficult to measure after the static swelling agent is filled in the conventional drill hole. The method utilizes the rubber sleeve to simulate the wall of the drill hole, the rubber sleeve is filled with the static bursting agent slurry prepared according to the optimal water-cement ratio, the closed space between the outer side of the rubber sleeve and the steel cylinder is filled with hydraulic oil, the radial expansion pressure generated by the hydration reaction of the static bursting agent in the rubber sleeve acts on the hydraulic oil in the closed space, the pressure value of the hydraulic oil in the closed space can be directly observed through a pressure gauge, the pressure value of the hydraulic oil in the closed space is the radial expansion pressure generated by the hydration reaction of the static bursting agent in the rubber sleeve, and the accurate measurement of the radial expansion pressure applied by the hydration reaction of the static bursting agent in the drill hole to the wall of the drill hole is.
Description
Technical Field
The invention belongs to the technical field of expansion pressure testing of static swelling agents, and particularly relates to a testing device for radial expansion pressure of a static swelling agent and a using method of the testing device.
Background
The static bursting agent belongs to building material products, and the corresponding industrial standard is 'JC 506-2008 silent breaking agent', the main component of which is hydrated lime which is a gray powdery material which is made of various inorganic substances and has the expansion performance and is used for non-explosive breaking. The working principle of the method is that a flowing slurry is prepared according to a proper water-cement ratio and directly poured into a drill hole, after hydration reaction, the volume is increased by about 2-3 times and is condensed into a solid with certain strength, the solid can be regarded as an elastic cylinder when being completely condensed in the drill hole, radial expansion pressure is generated along with the time and is applied to the hole wall, and the purpose of crushing rock mass around the hole wall is achieved.
In the engineering practice process of crushing rock mass by using the static expanding agent, the key problem to be solved is to determine the maximum radial expansion pressure and the change process of the radial expansion pressure which can be generated in a drill hole after hydration reaction of the selected static expanding agent material under the condition of preparing a proper water cement ratio, grasp the expansion performance of the selected static expanding agent material, and then carry out engineering design such as drill hole spacing, row spacing and the like. Under the condition of the prior art, the radial expansion pressure generated after the hydration reaction of the static expanding agent slurry prepared by the proper water cement ratio in the drill hole with the given diameter is difficult to test. Although some test methods are provided by the recommendation of the industry standard JC506-2008 silent cracking agent and the existing invention patents, certain defects exist, so that the error of a test result is large, and the engineering application effect is influenced.
A method for testing the expansion pressure generated by the hydration reaction of the static cracking agent in the drilled hole recommended by the building material industry standard JC506-2008 silent cracking agent is to simulate the drilled hole by using a steel pipe, stick a resistance strain gauge on the outer wall of the steel pipe by using glue, place the steel pipe stuck with the resistance strain gauge into a plastic bag and place the plastic bag into a constant temperature water tank, monitor the strain value of the strain gauge stuck on the outer wall of the steel pipe by using a strain gauge to obtain the strain quantity generated by the outer wall of the steel pipe under the action of the expansion pressure of the static cracking agent filled in the steel pipe, and indirectly calculate the radial expansion pressure generated by the static cracking agent in the steel pipe according to the thick-wall cylinder theory. This method clearly has two drawbacks: (1) the resistance strain gauge pasted on the outer wall of the steel pipe belongs to a resistance element, is particularly sensitive to temperature, and can cause large fluctuation and change of a strain value due to slight temperature difference. As is known, a large amount of heat energy is released in the hydration reaction process of the static bursting agent, and the heat conductivity of the steel pipe material is good. Therefore, the temperature of the steel pipe wall is increased by the heat released by the hydration reaction of the static expanding agent in the steel pipe. The test method comprises the steps of putting the steel pipe in a plastic bag and putting the plastic bag into a constant-temperature water tank so as to reduce errors caused by the temperature rise of the steel pipe. But the strain gauge is directly stuck on the outer wall of the steel pipe by glue, and is directly influenced by the temperature rise of the steel pipe wall, so that the test result is inaccurate. (2) The elastic modulus of the steel pipe material is 210GPa, the maximum expansion pressure generated after the hydration reaction of the static bursting agent is 50-60MPa, and the strain value of the outer wall of the steel pipe generated under the action of the expansion stress applied by the hydration reaction of the static bursting agent is very small, so that the test error is further enlarged. Therefore, the method for testing the static bursting agent swelling pressure recommended by the industry standard 'JC 506-2008 silent cracking agent' is less used in practical tests because of large error of test results.
The test principle of the test system is that a static bursting agent is placed in a steel pipe with openings at two ends, pistons are arranged at two ends of the steel pipe, a pressure tester provided with a pressure sensor is used for contacting the pistons, the pistons are pushed to move axially along the steel pipe when the volume of the static bursting agent in the steel pipe expands, and the pressure sensor on the pressure tester contacted with the pistons is used for recording the axial expansion pressure of the static bursting agent. One significant drawback of this method is that it is believed that the static cracking agent in the steel pipe spreads uniformly in the axial direction of the steel pipe when expanding in volume. In fact, however, the static cracking agent in the steel pipe is condensed into an elastic cylinder with a certain shear strength when the hydration reaction volume expands, so that a large friction force and a large adhesive force exist between the elastic cylinder and the wall of the steel pipe, and the friction force and the adhesive force can limit the axial displacement of the static cracking agent cylinder after the hydration reaction is condensed and solidified along the steel pipe, so that the tested axial expansion pressure cannot truly reflect the actual axial expansion pressure generated by the hydration reaction of the static cracking agent in the steel pipe.
In order to solve the problem that the radial expansion pressure applied to the wall of a drill hole is difficult to measure after a static cracking agent is filled in the drill hole, accurately measure the radial expansion pressure applied to the wall of the drill hole by the hydration reaction of the static cracking agent in the drill hole, master the expansion performance of the selected static cracking agent material in engineering practice, scientifically and reliably determine engineering design parameters such as the distance between the drill holes, the row spacing and the like, and urgently need to find a testing device and a testing method for the radial expansion pressure of the static cracking agent.
Disclosure of Invention
The invention provides a device for directly measuring the radial expansion pressure generated by the hydration reaction of a static cracking agent in a drill hole by utilizing closed hydraulic oil surrounding the drill hole wall, aiming at the problem that the radial expansion pressure applied to the drill hole wall is difficult to measure after the static cracking agent is filled in the existing drill hole, and provides a method for accurately measuring the radial expansion pressure generated at the hole wall position during the hydration reaction of the static cracking agent in the drill hole by utilizing the device.
The invention adopts the following technical scheme:
the utility model provides a testing arrangement for static bursting agent radial expansion pressure, including the rigid steel cylinder and the rubber sleeve that is located the good elasticity of steel cylinder, the both sides lateral wall of steel cylinder is connected with manometer and hydraulic pump through high pressure fuel pipe respectively, be equipped with discharge valve on the high pressure fuel pipe of connection manometer, be equipped with the stop valve on the high pressure fuel pipe of connection hydraulic pump, be equipped with hydraulic oil between steel cylinder and the rubber sleeve, be equipped with static bursting agent in the rubber sleeve, rubber sleeve's upper and lower both ends are equipped with the sealing washer respectively, the upper and lower both ends of steel cylinder are equipped with the semicircle annular recess that matches with rubber sleeve's sealing washer respectively, the upper and lower both ends of steel cylinder are equipped with a plurality of bolt holes respectively, the upper and lower both ends of steel cylinder are equipped with top cap and base respectively, be equipped with the bolt hole that matches with the bolt.
A method of using a test device for static bursting agent radial expansion pressure, comprising the steps of:
firstly, a rubber sleeve is arranged in a steel cylinder, a circular sealing ring at the outer edge of the rubber sleeve is placed in a groove of the steel cylinder, and the steel cylinder and a base are fastened through bolts;
secondly, preparing slurry of the static bursting agent according to the optimal water-cement ratio, filling the slurry into the rubber sleeve from the upper end opening of the rubber sleeve, fastening the steel cylinder and the top cover by using bolts when the slurry of the static bursting agent is filled to be level with the upper end opening of the rubber sleeve, and forming a surrounding closed space between the rubber sleeve and the steel cylinder;
thirdly, opening a stop valve and an exhaust valve outside the steel cylinder, injecting hydraulic oil into the surrounding closed space between the steel cylinder and the rubber sleeve by using a hydraulic pump, closing the stop valve and the exhaust valve when the surrounding closed space between the steel cylinder and the rubber sleeve is filled with the hydraulic oil, and removing air in the surrounding closed space between the steel cylinder and the rubber sleeve by using the exhaust valve in the oil injection process;
fourthly, observing and recording the reading of the pressure gauge, and obtaining the magnitude of radial expansion stress generated in the hydration reaction process of the static bursting agent to the hydraulic oil and the change process of the radial expansion stress;
fifthly, when the reading of the pressure gauge is not changed, judging that the hydration reaction of the static bursting agent in the rubber sleeve is finished, opening a stop valve, and recycling the hydraulic oil into the hydraulic pump;
and sixthly, after the hydraulic oil is recovered, removing the top cover and the base, cleaning the static bursting agent in the rubber sleeve, and finishing the test process.
The invention has the following beneficial effects:
the technical scheme provided by the invention solves the problem that the radial expansion pressure of the static swelling agent in the drill hole is difficult to test in engineering practice, the radial expansion pressure borne by the hole wall can be directly measured by utilizing the enclosed hydraulic oil surrounding the hole wall, and the radial expansion pressure generated by the hydration reaction of the static swelling agent in the drill hole can be quantitatively and accurately tested.
Radial expansion stress generated in the hydration reaction process of the static bursting agent slurry in the rubber sleevepAnd acts on the rubber sleeve. The rubber sleeve has good elasticity, so that the radial expansion pressure applied to the rubber sleeve is transmitted to the hydraulic oil surrounding the closed space between the steel cylinder and the rubber sleeve.
Compared with the prior art, the device for testing the radial expansion pressure generated by the static bursting agent in the drilled hole, provided by the invention, has the advantages of scientific principle, simplicity and convenience in use and reusability. The provided test method belongs to a direct test method, has small test error, enhances the reliability of applying the static bursting agent to solve engineering practical problems, and promotes the popularization and application of the static bursting agent in practical engineering.
Drawings
FIG. 1 is a schematic diagram of the apparatus of the present invention;
FIG. 2 is a front view of the rubber sleeve of the present invention;
FIG. 3 is a schematic structural view of the steel cylinder of the present invention;
FIG. 4 is a sectional view taken along line A-A of FIG. 1;
FIG. 5 is a sectional view taken along line B-B of FIG. 1;
FIG. 6 is a cross-sectional view taken along line C-C of FIG. 1;
FIG. 7 is a schematic representation of the radial expansion pressure generated by the static bursting agent;
FIG. 8 is a front view of the bolt of the present invention;
FIG. 9 is a schematic top view of the bolt of the present invention;
wherein: 1-a steel cylinder; 2-hydraulic oil; 3-a rubber sleeve; 4-static bursting agent; 5-a pressure gauge; 6-high pressure oil pipe; 7-an exhaust valve; 8-a stop valve; 9-a base; 10-a top cover; 11-a hydraulic pump; 12-bolt holes; 13-sealing ring; 14-a bolt; 15-groove.
Detailed Description
The invention is further explained with reference to the accompanying drawings.
A testing device for radial expansion pressure of a static expanding agent comprises a rigid steel cylinder 1 and a rubber sleeve 2 with good elasticity, wherein the rubber sleeve 2 is positioned in the steel cylinder 1, the side walls of the two sides of the steel cylinder 1 are respectively connected with a pressure gauge 5 and a hydraulic pump 11 through high-pressure oil pipes 6, the high-pressure oil pipes 6 connected with the pressure gauge 5 are provided with exhaust valves 7, the high-pressure oil pipes 6 connected with the hydraulic pump 11 are provided with stop valves 8, hydraulic oil 2 is arranged between the steel cylinder 1 and the rubber sleeve 3, the rubber sleeve 3 is internally provided with the static expanding agent 4, the upper end and the lower end of the rubber sleeve 3 are respectively provided with a sealing ring 13, the upper end and the lower end of the steel cylinder 1 are respectively provided with a semicircular groove 15 matched with the sealing ring 13 of the rubber sleeve 3, the upper end and the lower end of the steel cylinder 1 are respectively provided with a plurality of bolt holes 12, the upper end and the lower end of, the top cover 10 and the base 9 are respectively connected with the steel cylinder 1 through bolts 14.
A method of using a test device for static bursting agent radial expansion pressure, comprising the steps of:
firstly, a rubber sleeve 3 is arranged in a steel cylinder 1, a circular sealing ring 13 at the outer edge of the rubber sleeve 3 is placed in a groove 15 of the steel cylinder 1, and the steel cylinder 1 and a base 9 are fastened through a bolt 14;
secondly, preparing slurry of a static expanding agent 4 according to the optimal water-cement ratio, filling the slurry into the rubber sleeve 3 from the upper port of the rubber sleeve 3, and fastening the steel cylinder 1 and the top cover 10 by using a bolt 14 when the slurry of the static expanding agent 4 is filled to be level with the upper port of the rubber sleeve 3, so that a surrounding closed space is formed between the rubber sleeve 3 and the steel cylinder 1;
thirdly, opening a stop valve 8 and an exhaust valve 7 on the outer side of the steel cylinder 1, injecting hydraulic oil 2 into the surrounding closed space between the steel cylinder 1 and the rubber sleeve 3 by using a hydraulic pump 11, closing the stop valve 8 and the exhaust valve 7 when the surrounding closed space between the steel cylinder 1 and the rubber sleeve 3 is filled with the hydraulic oil 2, and removing air in the surrounding closed space between the steel cylinder 1 and the rubber sleeve 3 by using the exhaust valve 7 in the oil injection process;
fourthly, observing and recording the reading of the pressure gauge 5 to obtain the magnitude of radial expansion stress generated in the hydration reaction process of the static cracking agent 4 borne by the hydraulic oil 2 and the change process of the radial expansion stress;
fifthly, when the reading of the pressure gauge 5 is not changed any more, judging that the hydration reaction of the static bursting agent 4 in the rubber sleeve 3 is finished, opening the stop valve 8, and recycling the hydraulic oil 2 into the hydraulic pump 11;
and sixthly, after the recovery of the hydraulic oil 2 is finished, removing the top cover 10 and the base 9, cleaning the static bursting agent 4 in the rubber sleeve 3, and finishing the test process.
The steel cylinder 1 is a Q235 type cold-processed steel pipe, the height of the steel cylinder 1 is 500mm, the wall thickness is 10mm, the inner diameter is 74mm, the outer diameter is 94mm, and the elastic modulus is 210GPa (regarded as a rigid body). The thickness of the upper outer edge 11 and the lower outer edge 11 of the steel cylinder 1 is 10mm, the diameter of the steel cylinder is 120mm, semicircular annular grooves 15 with the depth of 2mm are formed in the positions with the diameters of 84mm of the upper outer edge and the lower outer edge, bolt holes 12 of 12 hexagon socket head cap bolts with the diameters of 6mm are machined in the positions with the diameters of 108mm of the upper outer edge and the lower outer edge, the threads are 1mm, and the thread length is 10 mm.
The static bursting agent 4 is produced according to the building material industry standard JC506-2008 silent breaking agent, belongs to building material products, mainly comprises hydrated lime, and is a gray powdery material which is made of various inorganic substances and has expansion performance and is used for non-explosive breaking. Its working principle is that it is mixed with proper quantity of water to form flowing slurry body, and directly poured into the drilled hole, and through hydration reaction the crystal is deformed, and can produce radial expansion pressurepAnd applied to the walls of the hole. The using environment temperature range is 10-30 degrees, the initial setting time is more than 10 minutes, the final setting time is less than 150 minutes, and the optimal water-cement ratio is 0.3: 0.7, stirring with clean water at normal temperature, wherein the maximum expansion pressure is 50-60 MPa.
The base 9 and the top cover 10 of the steel cylinder 1 are Q235 type cold-processed round steel plates, the thickness is 10mm, the diameter is 120mm, bolt holes 12 of 12 hexagon socket head cap bolts with the diameter of 10mm are processed at the position with the diameter of 108mm, the screw threads are omitted, and a semicircular annular groove 15 with the depth of 2mm is formed in the position with the diameter of 84mm on the inner side surface.
The inner diameter of the rubber sleeve 3 is 50mm, the outer diameter of the rubber sleeve is 54mm, the wall thickness of the rubber sleeve is 2mm, the height of the rubber sleeve is 500mm, the diameters of the upper outer edge and the lower outer edge of the rubber sleeve are 88mm, and the outline of the outer edge of the rubber sleeve is a circular sealing ring 13 with the diameter of 4 mm; the rubber material is black, has the confining pressure resistance of 100MPa, and has good air tightness and elasticity and small permanent deformation.
The pressure gauge 5 is a digital precision pressure gauge, the nominal diameter is phi 60mm, the measurement precision grade is 0.1 grade, and the measuring range is 100 MPa.
The hydraulic pump 11 is a small-sized manual one-way pressure pump, and is simple to operate and convenient to use.
The high-pressure oil pipe 6 is a rubber metal woven high-pressure oil pipe which is resistant to high pressure of 100MPa, has an inner diameter of 10mm and is connected through a quick connector.
The hydraulic oil 2 is pressure-resistant hydraulic oil with excellent abrasion resistance and stability, has low volume expansion and compression coefficients, and is approximately considered to have no volume change when being pressed.
Claims (2)
1. A testing arrangement for static bursting agent radial expansion pressure which characterized in that: comprises a rigid steel cylinder (1) and a rubber sleeve (2) with good elasticity positioned in the steel cylinder (1), wherein the side walls of two sides of the steel cylinder (1) are respectively connected with a pressure gauge (5) and a hydraulic pump (11) through a high-pressure oil pipe (6), the high-pressure oil pipe (6) connected with the pressure gauge (5) is provided with an exhaust valve (7), the high-pressure oil pipe (6) connected with the hydraulic pump (11) is provided with a stop valve (8), hydraulic oil (2) is arranged between the steel cylinder (1) and the rubber sleeve (3), the rubber sleeve (3) is internally provided with a static expanding agent (4), the upper end and the lower end of the rubber sleeve (3) are respectively provided with a sealing ring (13), the upper end and the lower end of the steel cylinder (1) are respectively provided with a semicircular groove (15) matched with the sealing ring (13) of the rubber sleeve (3), the upper end and the lower end of the steel cylinder (1) are respectively provided with a plurality of, the top cover (10) and the base (9) are respectively provided with bolt holes (12) matched with the bolt holes (12) of the steel cylinder (1), and the top cover (10) and the base (9) are respectively connected with the steel cylinder (1) through bolts (14).
2. A method of using the test device for static bursting agent radial expansion pressure of claim 1, wherein: the method comprises the following steps:
firstly, a rubber sleeve (3) is arranged in a steel cylinder (1), a circular sealing ring (13) at the outer edge of the rubber sleeve (3) is placed in a groove (15) of the steel cylinder (1), and the steel cylinder (1) and a base (9) are fastened through a bolt (14);
secondly, preparing slurry of the static expanding agent (4) according to the optimal water-cement ratio, filling the slurry into the rubber sleeve (3) from the upper end opening of the rubber sleeve (3), and fastening the steel cylinder (1) and the top cover (10) by using a bolt (14) when the slurry of the static expanding agent (4) is filled to be level with the upper end opening of the rubber sleeve (3) to form a surrounding closed space between the rubber sleeve (3) and the steel cylinder (1);
thirdly, opening a stop valve (8) and an exhaust valve (7) on the outer side of the steel cylinder (1), injecting hydraulic oil (2) into a surrounding closed space between the steel cylinder (1) and the rubber sleeve (3) by using a hydraulic pump (11), closing the stop valve (8) and the exhaust valve (7) when the surrounding closed space between the steel cylinder (1) and the rubber sleeve (3) is filled with the hydraulic oil (2), and removing air in the surrounding closed space between the steel cylinder (1) and the rubber sleeve (3) by using the exhaust valve (7) in the oil injection process;
fourthly, observing and recording the reading of the pressure gauge (5), and obtaining the magnitude of radial expansion stress generated in the hydration reaction process of the static bursting agent (4) on the hydraulic oil (2) and the change process of the radial expansion stress;
fifthly, when the reading of the pressure gauge (5) is not changed any more, judging that the hydration reaction of the static bursting agent (4) in the rubber sleeve (3) is finished, opening the stop valve (8), and recycling the hydraulic oil (2) into the hydraulic pump (11);
and sixthly, after the hydraulic oil (2) is recovered, removing the top cover (10) and the base (9), cleaning the static bursting agent (4) in the rubber sleeve (3), and finishing the test process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911337563.9A CN111122778A (en) | 2019-12-23 | 2019-12-23 | Testing device for radial expansion pressure of static bursting agent and using method |
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| CN201911337563.9A CN111122778A (en) | 2019-12-23 | 2019-12-23 | Testing device for radial expansion pressure of static bursting agent and using method |
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| CN112031750A (en) * | 2020-09-03 | 2020-12-04 | 东北大学 | Device and method for testing radial expansion pressure of static crushing agent in drill hole |
| CN114441317A (en) * | 2020-11-06 | 2022-05-06 | 中国石油化工股份有限公司 | Shale hydration expansion stress testing device and method |
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Application publication date: 20200508 |