CN117571489B - Rock drillability evaluation test device under true three-dimensional high stress state - Google Patents
Rock drillability evaluation test device under true three-dimensional high stress state Download PDFInfo
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- CN117571489B CN117571489B CN202410048791.9A CN202410048791A CN117571489B CN 117571489 B CN117571489 B CN 117571489B CN 202410048791 A CN202410048791 A CN 202410048791A CN 117571489 B CN117571489 B CN 117571489B
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- 239000011435 rock Substances 0.000 title claims abstract description 166
- 238000012360 testing method Methods 0.000 title claims abstract description 33
- 238000011156 evaluation Methods 0.000 title claims abstract description 28
- 238000005553 drilling Methods 0.000 claims abstract description 65
- 238000007789 sealing Methods 0.000 claims abstract description 47
- 239000000565 sealant Substances 0.000 claims abstract description 18
- 238000006073 displacement reaction Methods 0.000 claims description 35
- 230000005540 biological transmission Effects 0.000 claims description 12
- 239000003921 oil Substances 0.000 claims description 11
- 239000010720 hydraulic oil Substances 0.000 claims description 9
- 238000007605 air drying Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 238000010998 test method Methods 0.000 claims description 3
- 238000011160 research Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 4
- 238000013461 design Methods 0.000 abstract description 3
- 238000005457 optimization Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/025—Geometry of the test
- G01N2203/0256—Triaxial, i.e. the forces being applied along three normal axes of the specimen
Abstract
The rock drillability evaluation test device comprises a (1) cushion block, a (2) cushion block, a (3) cushion block, a (4) cushion block and a tooth drilling and rock breaking mechanism, wherein the four cushion blocks are sequentially connected end to end, the (2) cushion block and the (4) cushion block are clamped between the (1) cushion block and the (3) cushion block, a rock sample is contacted with the (2) cushion block, the (3) cushion block and the (4) cushion block, a gap is reserved between the rock sample and the (1) cushion block, an elastic sealing gasket is arranged in the gap between the (1) cushion block and the rock sample, the edge of the rock sample is distributed along the shape, and the exposed surface of the rock sample is covered and sealed by sealant; the tooth drilling and rock breaking mechanism is embedded in the No. 1 cushion block. The invention can be matched with a true triaxial test machine for use, can meet the drilling tooth rock breaking effect research and the optimization design research of deep hard rock under the true triaxial stress condition, can realize the rock drillability evaluation under the true three-dimensional stress field environment, and provides theory and data support for the deep engineering hard rock drilling technology.
Description
Technical Field
The invention belongs to the technical field of rock breaking tests, and particularly relates to a rock drillability evaluation test device under a true three-dimensional high stress state.
Background
With resource exploration, oil and gas exploitation and CO 2 The engineering such as sealing and storing gradually enters the deep drilling development stage, and in the deep true three-dimensional high-stress hard rock drilling process, the characteristics of serious drill bit abrasion and high construction cost exist, so that the deep hard rock breaking work difficulty is causedThe deep engineering construction faces the difficult problem of crushing the high-strength hard rock under the deep true three-dimensional high stress, and the key of the problem is that the tooth drilling and rock breaking mechanism of the deep engineering hard rock under the true three-dimensional high stress is unclear and the rock drillability is unknown.
The drillability evaluation of the deep engineering hard rock is an important index for determining the drilling efficiency of the deep engineering hard rock, is also an important basis for optimizing the drilling of the deep engineering hard rock, scientifically cognizes the tooth breaking mechanism and drillability of the deep engineering hard rock under the true three-dimensional high stress of the deep, and is favorable for optimizing the roller bit and the drilling process, so that the drilling efficiency of the deep engineering hard rock is improved.
At present, the rock drillability test technology research mainly considers the characteristics of uniaxial strength, hardness and the like of the rock, and does not consider the influence of the real three-dimensional stress field environment of deep engineering. Because the rock during deep drilling is often in a three-dimensional high-stress environment, the rock mechanical property and the shallow stress-free state or the ground stress state are greatly different, and the common drill bit cannot achieve the expected rock breaking effect in the three-dimensional high-stress state, so that the deep hard rock breaking efficiency is low and the difficulty is high.
Therefore, aiming at the characteristics of dense and hard deep high-stress hard rock, high stress, high strength and the like, and the problems of high rock breaking power consumption, low efficiency, serious abrasion and the like of a drill bit, the research and development of a rock drillability evaluation test device under a true three-dimensional high-stress state is needed.
Disclosure of Invention
Aiming at the problems existing in the prior art, the rock drillability evaluation test device in the true three-dimensional high-stress state can be used with a true triaxial test machine to simulate the true stress environment of a deep engineering site, can meet the tooth drilling and rock breaking effect research and the optimal design research of deep hard rock under the true three-dimensional stress condition, can realize rock drillability evaluation in the true three-dimensional stress field environment, and provides theory and data support for further improving the deep engineering hard rock drilling technology.
In order to achieve the above purpose, the present invention adopts the following technical scheme: the rock drillability evaluation test device in the true three-dimensional high-stress state comprises a (1) cushion block, a (2) cushion block, a (3) cushion block, a (4) cushion block and a tooth drilling and rock breaking mechanism; the rock sample is contacted with the No. 2 cushion block, the No. 3 cushion block and the No. 4 cushion block, a gap is reserved between the rock sample and the No. 1 cushion block, an elastic sealing gasket is arranged in the gap between the No. 1 cushion block and the rock sample, the elastic sealing gasket is distributed along with the edge line of the rock sample, and two exposed surfaces of the rock sample are covered and sealed by sealant; the tooth drilling and rock breaking mechanism is embedded in the No. 1 cushion block.
The drilling tooth rock breaking mechanism comprises a cylinder sleeve body, a double-rod piston, a cylinder sleeve cover and drilling teeth; the number (1) cushion block is provided with a cylinder sleeve body mounting hole, the cylinder sleeve body is embedded in the cylinder sleeve body mounting hole, and the cylinder sleeve body has a rotation degree of freedom in the cylinder sleeve body mounting hole; the cylinder sleeve body is provided with a piston mounting hole, and the double-rod piston is embedded in the piston mounting hole; the cylinder sleeve cover is arranged between one end of the double-rod piston and the piston mounting hole and is far away from the rock sample; the drilling teeth are adjacent to the rock sample and are coaxially and fixedly arranged at the other end of the double-rod-outlet piston.
A sealing ring (1) is arranged between the cylinder sleeve body and the cylinder sleeve body mounting hole; the double-rod piston is characterized in that a No. 2 sealing ring is arranged between the middle piston disc section and the piston mounting hole of the double-rod piston, a No. 3 sealing ring is arranged between the drilling side rod body section and the piston mounting hole of the double-rod piston, a No. 4 sealing ring is arranged between the cylinder sleeve cover side rod body section and the cylinder sleeve cover of the double-rod piston, and a No. 5 sealing ring is arranged between the cylinder sleeve cover and the piston mounting hole.
The cylinder sleeve body is also provided with a linear displacement sensor mounting hole, a linear displacement sensor is embedded in the linear displacement sensor mounting hole, and the linear displacement sensor and the double-rod piston are distributed in parallel; the double-rod piston is fixedly connected with a force transmission frame between the double-rod piston and a measuring core rod of the linear displacement sensor, the force transmission frame is connected with the double-rod piston through countersunk screws, and the force transmission frame is connected with the measuring core rod of the linear displacement sensor through nuts.
The cylinder sleeve body mounting hole is eccentrically arranged on the No. 1 cushion block, and the axis of the piston mounting hole passes through the geometric center of the No. 1 cushion block around the rotation track of the axis of the cylinder sleeve body mounting hole.
The cylinder sleeve body is provided with an oil pressure balance hole, one end of the oil pressure balance hole is communicated with a rod cavity on the drilling tooth side of the double-rod piston, the oil pressure balance hole is communicated with a linear displacement sensor mounting hole, and the linear displacement sensor mounting hole is a non-sealing hole.
And an air pressure balance hole is formed in the cylinder sleeve body, one end of the air pressure balance hole is communicated with a rod cavity at the side of a cylinder sleeve cover of the double-rod piston, and the other end of the air pressure balance hole is communicated with a clearance space between the rock sample and the No. 1 cushion block.
The rock drillability evaluation test method under the true three-dimensional high stress state adopts the rock drillability evaluation test device under the true three-dimensional high stress state, and comprises the following steps:
step one: pre-assembling and clamping the cushion block (1), the cushion block (2), the cushion block (3) and the cushion block (4) with a rock sample, synchronously completing the installation of an elastic sealing gasket between the cushion block (1) and the rock sample, and temporarily fixing the cushion blocks through pre-assembling fastening screws;
step two: coating sealant on two exposed surfaces of a rock sample, completely sealing and covering the two exposed surfaces of the rock sample, an elastic sealing gasket and a cushion block joint through the sealant, then sending the rock sample coated with the sealant and the cushion block assembly into a constant temperature box for air drying treatment, and removing the rock sample and the cushion block assembly from the constant temperature box after the air drying treatment is finished;
step three: the tooth drilling and rock breaking mechanism is installed into a No. 1 cushion block, and then the preassembled fastening screws are completely removed;
step four, a step four is carried out; the rock sample and cushion block assembly is sent into a pressure chamber of a true triaxial tester, and a linear displacement sensor wire in a drilling tooth rock breaking mechanism is connected to a sensor channel of the pressure chamber;
step five: pre-clamping a rock sample through two actuator pressure heads in the horizontal direction of the true triaxial tester, pre-clamping the rock sample through two actuator pressure heads in the vertical direction of the true triaxial tester, sealing a pressure chamber of the true triaxial tester, and injecting hydraulic oil into the pressure chamber;
step six: applying confining pressure to a rock sample to a minimum main stress preset value through hydraulic oil, loading the rock sample to an intermediate main stress preset value through a (2) cushion block and a (4) cushion block in the vertical direction, loading preset acting force to the rock sample through a tooth drilling and rock breaking mechanism and a (3) cushion block in the horizontal direction, gradually pressing the tooth into the rock sample under preset pressure, synchronously measuring the pressing-in distance of the tooth through a linear displacement sensor, and observing the dynamic breaking process of the rock sample;
step seven: firstly unloading pressure in the horizontal direction, then unloading pressure in the vertical direction, then unloading confining pressure, then discharging hydraulic oil in a pressure chamber, removing a rock sample and a cushion block assembly from the pressure chamber, resetting a drilling tooth rock breaking mechanism, rotating a cylinder sleeve body of the drilling tooth rock breaking mechanism by a set angle, and adjusting the pressing-in position of the drilling tooth on the rock sample;
step eight: repeating the fourth step to the seventh step, and continuing to finish the test.
The invention has the beneficial effects that:
the rock drillability evaluation test device in the true three-dimensional high-stress state can be used with a true triaxial test machine to simulate the real stress environment of a deep engineering site, can meet the tooth drilling rock breaking effect research and the optimization design research of deep hard rock under the true three-dimensional stress condition, can realize rock drillability evaluation under the real three-dimensional stress field environment, and provides theory and data support for further improving the deep engineering hard rock drilling technology.
According to the rock drillability evaluation test device in the true three-dimensional high-stress state, disclosed by the invention, the position of the drilling tooth can be changed under the conditions that a rock sample is not rubbed and the tightness of the rock sample is not damaged, and compared with a fixed single-drilling-tooth point load test, the rock drillability evaluation test device can be used for carrying out a multi-drilling-tooth damage test.
Drawings
FIG. 1 is a schematic structural diagram of a rock drillability evaluation test apparatus under a true three-dimensional high stress state (view angle I);
FIG. 2 is a cross-sectional view A-A of FIG. 1;
FIG. 3 is a schematic structural diagram (view II) of a rock drillability evaluation test device under a true three-dimensional high stress state;
fig. 4 is a schematic diagram of an assembly structure of the (1) cushion block and the tooth drilling and rock breaking mechanism (before pressure loading);
FIG. 5 is a schematic diagram of an assembly structure of the (1) cushion block and the tooth-drilling rock-breaking mechanism (after pressure loading);
FIG. 6 is a schematic structural view (cross-section) of the cushion block (1) of the present invention;
FIG. 7 is a schematic view (in cross section) of the cylinder liner body of the present invention;
FIG. 8 is a cross-sectional view B-B of FIG. 7;
in the figure, a cushion block 1- (1), a cushion block 2- (2), a cushion block 3- (3), a cushion block 4- (4), a 5-rock sample, a 6-elastic sealing gasket, a 7-cylinder sleeve body, a 8-double-rod piston, a 9-cylinder sleeve cover, a 10-drilling tooth, a 11-cylinder sleeve body mounting hole, a 12-piston mounting hole, a sealing ring 13- (1), a sealing ring 14- (2), a sealing ring 15- (3), a sealing ring 16- (4), a sealing ring 17- (5), a sealing ring 18-linear displacement sensor mounting hole, a 19-linear displacement sensor, a 20-force transmission frame, a 21-sealing glue, a 22-oil pressure balance hole, a 23-drilling tooth side rod cavity, a 24-air pressure balance hole, a 25-cylinder sleeve cover side rod cavity and a 26-preassembled fastening screw.
Detailed Description
The invention will now be described in further detail with reference to the drawings and to specific examples.
As shown in fig. 1 to 8, the rock drillability evaluation test device in the true three-dimensional high-stress state comprises a (1) cushion block 1, a (2) cushion block 2, a (3) cushion block 3, a (4) cushion block 4 and a tooth drilling and rock breaking mechanism; the rock sample 5 is contacted with the cushion block 2 (3) No. 3 and the cushion block 4 (2) No. 2, the cushion block 1 (2) No. 3 and the cushion block 4 (4) No. 4 in an end-to-end sequence, the cushion blocks 2 and 4 (2) No. 2 and the cushion block 3 (3) No. 2 are clamped between the cushion blocks 1 and 3 (2) No. 2 and the cushion block 3 and 4 (4), a gap is reserved between the rock sample 5 and the cushion block 1 (1), an elastic sealing gasket 6 is arranged in the gap between the cushion block 1 (1) No. 1 and the rock sample 5, the elastic sealing gasket 6 and the edge line of the rock sample 5 are distributed in a conformal manner, and two exposed surfaces of the rock sample 5 are covered and sealed by a sealing glue 21; the tooth drilling and rock breaking mechanism is embedded in a No. 1 cushion block 1.
The drilling tooth rock breaking mechanism comprises a cylinder sleeve body 7, a double-rod piston 8, a cylinder sleeve cover 9 and drilling teeth 10; a cylinder sleeve body mounting hole 11 is formed in the (1) cushion block 1, the cylinder sleeve body 7 is embedded in the cylinder sleeve body mounting hole 11, and the cylinder sleeve body 7 has a rotation degree of freedom in the cylinder sleeve body mounting hole 11; a piston mounting hole 12 is formed in the cylinder sleeve body 7, and the double-rod piston 8 is embedded in the piston mounting hole 12; the cylinder sleeve cover 9 is arranged between one end of the double-rod piston 8 and the piston mounting hole 12 and is far away from the rock sample 5; the drilling teeth 10 are adjacent to the rock sample 5 and coaxially fixed at the other end of the double-rod piston 8.
A (1) sealing ring 13 is arranged between the cylinder sleeve body 7 and the cylinder sleeve body mounting hole 11; a sealing ring (2) is arranged between the middle piston disc section of the double-rod-outlet piston 8 and the piston mounting hole 12, a sealing ring (3) is arranged between the drilling tooth side rod body section of the double-rod-outlet piston 8 and the piston mounting hole 12, a sealing ring (4) is arranged between the cylinder cover side rod body section of the double-rod-outlet piston 8 and the cylinder cover 9, and a sealing ring (5) is arranged between the cylinder cover 9 and the piston mounting hole 12.
The cylinder sleeve body 7 is also provided with a linear displacement sensor mounting hole 18, a linear displacement sensor 19 is embedded in the linear displacement sensor mounting hole 18, and the linear displacement sensor 19 and the double-rod piston 8 are distributed in parallel; a force transmission frame 20 is fixedly connected between the double-rod piston 8 and the measuring core rod of the linear displacement sensor 19, the force transmission frame 20 is connected with the double-rod piston 8 through countersunk screws, and the force transmission frame 20 is connected with the measuring core rod of the linear displacement sensor 19 through nuts. In this embodiment, the linear displacement sensor 19 and the linear displacement sensor mounting hole 18 are connected and fixed by a screw thread.
The cylinder sleeve body mounting hole 11 is eccentrically arranged on the No. 1 cushion block 1, and the axis of the piston mounting hole 12 passes through the geometric center of the No. 1 cushion block 1 around the rotation track of the axis of the cylinder sleeve body mounting hole 11.
The cylinder sleeve body 7 is provided with an oil pressure balance hole 22, one end of the oil pressure balance hole 22 is communicated with a rod cavity 23 on the drilling tooth side of the double-rod piston 8, the oil pressure balance hole 22 is communicated with a linear displacement sensor mounting hole 18, and the linear displacement sensor mounting hole 18 is a non-sealing hole.
The cylinder sleeve body 7 is provided with an air pressure balance hole 24, one end of the air pressure balance hole 24 is communicated with a rod cavity 25 on the side of a cylinder sleeve cover of the double-rod piston 8, and the other end of the air pressure balance hole 24 is communicated with a clearance space between the rock sample 5 and the (1) cushion block 1.
The rock drillability evaluation test method under the true three-dimensional high stress state adopts the rock drillability evaluation test device under the true three-dimensional high stress state, and comprises the following steps:
step one: pre-assembling and clamping the cushion block 1, the cushion block 2, the cushion block 3, the cushion block 4 and the rock sample 5, synchronously completing the installation of the elastic sealing gasket 6 between the cushion block 1 and the rock sample 5, and temporarily fixing the cushion blocks through pre-assembling fastening screws 26; in this embodiment, the (1) No. pad 1, the (2) No. pad 2 and the (3) No. pad 3 are temporarily fixed by two pre-assembled fastening screws 26, and the (4) No. pad 4, the (2) No. pad 2 and the (3) No. pad 3 are also temporarily fixed by two pre-assembled fastening screws 26, wherein eight pre-assembled fastening screws 26 are required in total;
step two: coating sealant 21 on two exposed surfaces of a rock sample 5, completely sealing and covering the two exposed surfaces of the rock sample 5, an elastic sealing gasket 6 and a cushion block joint through the sealant 21, then sending the rock sample 5 coated with the sealant 21 and the cushion block assembly into a constant temperature box for air drying treatment, and after the air drying treatment is finished, removing the rock sample 5 and the cushion block assembly from the constant temperature box; in this embodiment, the application of the sealant 21 should be repeated for several times to remove the air bubbles in the sealant 21, so that the sealant 21 has good tightness, if the air bubbles are found in the coating layer of the sealant 21 after the air drying treatment, the air bubbles should be partially removed and the sealant 21 should be re-applied, and then the air bubbles are re-sent into the incubator for air drying treatment until the surface of the coating layer of the sealant 21 is flat and free of air bubbles;
step three: the tooth drilling and rock breaking mechanism is installed in a No. 1 cushion block 1, and then the preassembly fastening screw 26 is completely removed;
step four, a step four is carried out; the rock sample 5 and the cushion block assembly are sent into a pressure chamber of a true triaxial tester, and a linear displacement sensor 19 in a tooth drilling and rock breaking mechanism is connected to a sensor channel of the pressure chamber through a wire; in the embodiment, a (2) cushion block 2 and a (4) cushion block 4 are matched with two actuator pressure heads in the vertical direction of a true triaxial test machine, a (1) tooth drilling and rock breaking mechanism on a No cushion block 1 and a (3) cushion block 3 are matched with two actuator pressure heads in the horizontal direction of the true triaxial test machine, the actuator pressure heads directly prop against a force transmission frame 20 of the tooth drilling and rock breaking mechanism, and the force transmission frame 20 synchronously drives a double-output rod piston 8 and a linear displacement sensor 19 to move;
step five: pre-clamping the rock sample 5 through two actuator pressure heads in the horizontal direction of the true triaxial tester, pre-clamping the rock sample 5 through two actuator pressure heads in the vertical direction of the true triaxial tester, sealing a pressure chamber of the true triaxial tester, and injecting hydraulic oil into the pressure chamber;
step six: applying confining pressure to the rock sample 5 to a minimum main stress preset value through hydraulic oil, then loading the rock sample 5 to an intermediate main stress preset value through a (2) cushion block 2 and a (4) cushion block 4 in the vertical direction, then loading preset acting force to the rock sample 5 through a tooth drilling and rock breaking mechanism and a (3) cushion block 3 in the horizontal direction, gradually pressing the tooth drilling 10 into the rock sample 5 under the preset pressure, synchronously measuring the pressing-in distance of the tooth drilling 10 through a linear displacement sensor 19, and observing the dynamic crushing process of the rock sample 5;
step seven: firstly unloading pressure in the horizontal direction, then unloading pressure in the vertical direction, then unloading confining pressure, then discharging hydraulic oil in a pressure chamber, removing the rock sample 5 and a cushion block assembly body from the pressure chamber, resetting a drilling tooth rock breaking mechanism, and rotating a cylinder sleeve body 7 of the drilling tooth rock breaking mechanism by a set angle to adjust the pressing-in position of the drilling tooth 10 on the rock sample 5;
step eight: repeating the fourth step to the seventh step, and continuing to finish the test.
The embodiments are not intended to limit the scope of the invention, but rather are intended to cover all equivalent implementations or modifications that can be made without departing from the scope of the invention.
Claims (6)
1. Rock drillability evaluation test device under true three-dimensional high stress state, its characterized in that: the drilling and rock breaking mechanism comprises a number (1) cushion block, a number (2) cushion block, a number (3) cushion block, a number (4) cushion block and a tooth drilling and rock breaking mechanism; the rock sample is contacted with the No. 2 cushion block, the No. 3 cushion block and the No. 4 cushion block, a gap is reserved between the rock sample and the No. 1 cushion block, an elastic sealing gasket is arranged in the gap between the No. 1 cushion block and the rock sample, the elastic sealing gasket is distributed along with the edge line of the rock sample, and two exposed surfaces of the rock sample are covered and sealed by sealant; the tooth drilling and rock breaking mechanism is embedded in the No. 1 cushion block; the drilling tooth rock breaking mechanism comprises a cylinder sleeve body, a double-rod piston, a cylinder sleeve cover and drilling teeth; the number (1) cushion block is provided with a cylinder sleeve body mounting hole, the cylinder sleeve body is embedded in the cylinder sleeve body mounting hole, and the cylinder sleeve body has a rotation degree of freedom in the cylinder sleeve body mounting hole; the cylinder sleeve body is provided with a piston mounting hole, and the double-rod piston is embedded in the piston mounting hole; the cylinder sleeve cover is arranged between one end of the double-rod piston and the piston mounting hole and is far away from the rock sample; the drilling teeth are adjacent to the rock sample and are coaxially and fixedly arranged at the other end of the double-rod-outlet piston; the cylinder sleeve body mounting hole is eccentrically arranged on the No. 1 cushion block, and the axis of the piston mounting hole passes through the geometric center of the No. 1 cushion block around the rotation track of the axis of the cylinder sleeve body mounting hole.
2. The rock drillability evaluation test device in a true three-dimensional high stress state according to claim 1, wherein: a sealing ring (1) is arranged between the cylinder sleeve body and the cylinder sleeve body mounting hole; the double-rod piston is characterized in that a No. 2 sealing ring is arranged between the middle piston disc section and the piston mounting hole of the double-rod piston, a No. 3 sealing ring is arranged between the drilling side rod body section and the piston mounting hole of the double-rod piston, a No. 4 sealing ring is arranged between the cylinder sleeve cover side rod body section and the cylinder sleeve cover of the double-rod piston, and a No. 5 sealing ring is arranged between the cylinder sleeve cover and the piston mounting hole.
3. The rock drillability evaluation test device in a true three-dimensional high stress state according to claim 1, wherein: the cylinder sleeve body is also provided with a linear displacement sensor mounting hole, a linear displacement sensor is embedded in the linear displacement sensor mounting hole, and the linear displacement sensor and the double-rod piston are distributed in parallel; the double-rod piston is fixedly connected with a force transmission frame between the double-rod piston and a measuring core rod of the linear displacement sensor, the force transmission frame is connected with the double-rod piston through countersunk screws, and the force transmission frame is connected with the measuring core rod of the linear displacement sensor through nuts.
4. The rock drillability evaluation test device in a true three-dimensional high stress state according to claim 1, wherein: the cylinder sleeve body is provided with an oil pressure balance hole, one end of the oil pressure balance hole is communicated with a rod cavity on the drilling tooth side of the double-rod piston, the oil pressure balance hole is communicated with a linear displacement sensor mounting hole, and the linear displacement sensor mounting hole is a non-sealing hole.
5. The rock drillability evaluation test device in a true three-dimensional high stress state according to claim 1, wherein: and an air pressure balance hole is formed in the cylinder sleeve body, one end of the air pressure balance hole is communicated with a rod cavity at the side of a cylinder sleeve cover of the double-rod piston, and the other end of the air pressure balance hole is communicated with a clearance space between the rock sample and the No. 1 cushion block.
6. The rock drillability evaluation test method under the true three-dimensional high stress state adopts the rock drillability evaluation test device under the true three-dimensional high stress state as claimed in claim 3, and is characterized by comprising the following steps:
step one: pre-assembling and clamping the cushion block (1), the cushion block (2), the cushion block (3) and the cushion block (4) with a rock sample, synchronously completing the installation of an elastic sealing gasket between the cushion block (1) and the rock sample, and temporarily fixing the cushion blocks through pre-assembling fastening screws;
step two: coating sealant on two exposed surfaces of a rock sample, completely sealing and covering the two exposed surfaces of the rock sample, an elastic sealing gasket and a cushion block joint through the sealant, then sending the rock sample coated with the sealant and the cushion block assembly into a constant temperature box for air drying treatment, and removing the rock sample and the cushion block assembly from the constant temperature box after the air drying treatment is finished;
step three: the tooth drilling and rock breaking mechanism is installed into a No. 1 cushion block, and then the preassembled fastening screws are completely removed;
step four, a step four is carried out; the rock sample and cushion block assembly is sent into a pressure chamber of a true triaxial tester, and a linear displacement sensor wire in a drilling tooth rock breaking mechanism is connected to a sensor channel of the pressure chamber;
step five: pre-clamping a rock sample through two actuator pressure heads in the horizontal direction of the true triaxial tester, pre-clamping the rock sample through two actuator pressure heads in the vertical direction of the true triaxial tester, sealing a pressure chamber of the true triaxial tester, and injecting hydraulic oil into the pressure chamber;
step six: applying confining pressure to a rock sample to a minimum main stress preset value through hydraulic oil, loading the rock sample to an intermediate main stress preset value through a (2) cushion block and a (4) cushion block in the vertical direction, loading preset acting force to the rock sample through a tooth drilling and rock breaking mechanism and a (3) cushion block in the horizontal direction, gradually pressing the tooth into the rock sample under preset pressure, synchronously measuring the pressing-in distance of the tooth through a linear displacement sensor, and observing the dynamic breaking process of the rock sample;
step seven: firstly unloading pressure in the horizontal direction, then unloading pressure in the vertical direction, then unloading confining pressure, then discharging hydraulic oil in a pressure chamber, removing a rock sample and a cushion block assembly from the pressure chamber, resetting a drilling tooth rock breaking mechanism, rotating a cylinder sleeve body of the drilling tooth rock breaking mechanism by a set angle, and adjusting the pressing-in position of the drilling tooth on the rock sample;
step eight: repeating the fourth step to the seventh step, and continuing to finish the test.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410048791.9A CN117571489B (en) | 2024-01-12 | 2024-01-12 | Rock drillability evaluation test device under true three-dimensional high stress state |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410048791.9A CN117571489B (en) | 2024-01-12 | 2024-01-12 | Rock drillability evaluation test device under true three-dimensional high stress state |
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| CN117571489A CN117571489A (en) | 2024-02-20 |
| CN117571489B true CN117571489B (en) | 2024-03-22 |
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Citations (16)
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