CN108444889B - Variable-pressure adjustable rock mass fracture permeability testing device - Google Patents
Variable-pressure adjustable rock mass fracture permeability testing device Download PDFInfo
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- CN108444889B CN108444889B CN201810375922.9A CN201810375922A CN108444889B CN 108444889 B CN108444889 B CN 108444889B CN 201810375922 A CN201810375922 A CN 201810375922A CN 108444889 B CN108444889 B CN 108444889B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
Abstract
The invention belongs to the technical field of rock permeability measurement, and discloses a variable-pressure adjustable rock fracture permeability testing device which comprises a plugging device, a converter, a communicating pipe, a drilling machine, a drill rod and a control operation table. The converter is connected to the tail part of the front plugging device in a threaded manner, an inner ring, a spring and a cross wire sleeve are arranged in the converter, and the compression degree of the spring is changed by adjusting the cross wire sleeve so as to control the opening pressure of the inner ring; after the front plugging device and the tail plugging device expand, a water injection cavity is formed by the front plugging device and the drill hole, and external high-pressure water enters the water injection cavity through the converter to detect the permeability of a crack of the drill hole. The testing device simplifies an external operating system and operating steps, reduces the number of pipelines in a drill hole, avoids the problem of winding of a drill rod, improves the stability of the measuring process, realizes the plugging process and the measuring process to work under respective pressure by utilizing the same water source, and realizes the variable-pressure regulation of the converter so as to adapt to different working environments and opening pressure requirements.
Description
Technical Field
The invention belongs to the technical field of rock permeability determination, and particularly relates to a variable-pressure adjustable rock fracture permeability testing device.
Background
The permeability coefficient of the rock mass is an important parameter for reflecting the permeability of the fractured rock mass, and the change of the permeability of the rock mass is closely related to the damage condition of the rock mass. Therefore, the research on the relationship between the permeability coefficient of the rock mass and the size of the fracture, the water injection amount and the water injection pressure is of great significance. The existing common equipment for detecting the permeability of the drill hole is a double-end plugging leakage detection device, and has the advantages of relatively high measurement precision, convenience in manufacturing and the like.
Disclosure of Invention
The invention aims to provide a variable-pressure adjustable rock mass fracture permeability testing device.
The technical scheme of the invention is as follows:
a variable-pressure adjustable rock mass fracture permeability testing device comprises a plugging device, a converter 6, a communicating pipe 25, a drilling machine 11, a drill rod 9 and a control operation table 32; the occluder further comprises a front occluder 30 and a rear occluder 31;
the converter 6 is connected to the tail part of the front plugging device 30 in a threaded manner, the interior of the converter comprises an inner ring 34, a spring 22 and a cross wire sleeve 29, and the compression degree of the spring 22 is changed by adjusting the position of the cross wire sleeve 29 so as to control the opening pressure of the inner ring 34; an external water source is injected into the plugging cavity 27 through a water leakage hole 33 in the water leakage pipe 3 to expand the rubber bag 5, the front plugging device 30 and the tail plugging device 31 expand to form a water injection cavity 26 together with the drill hole 28, and external high-pressure water enters the water injection cavity 26 through the converter 6 to detect the crack permeability of the drill hole 28;
the drilling machine 11 is connected with the test probe through a drill rod 9 and used for lengthening and propelling the test probe to a designated area, the drill rod 9 is a hollow rod, an external high-pressure water source can be conveyed inside the hollow rod, and the drill rod 9 is in threaded connection with the test probe and can be detached;
the control operation platform 32 is connected with the drill rod 9 through a high-pressure hose 10 and comprises a water discharge switch 12, a flow meter 13, a mechanical pressure gauge 14, a master control switch 15 and an electronic pressure gauge 16, and the control operation platform 32 is responsible for providing a water source with preset pressure, releasing pressure and discharging water, and detecting and recording parameters such as pressure, flow and the like;
the front plugging device 30 comprises a first connector 2, a water leakage pipe 3, a second connector 4 and a rubber bag 5, wherein the first connector 2 and the second connector 4 are in threaded connection with the water leakage pipe 3, the rubber bag 5 is wound outside the water leakage pipe 3 and fixed outside the first connector 2 and the second connector 4 through a fastening ring 24 to form a plugging cavity 27 with the water leakage pipe 3; the outer end of the first connector 2 is in threaded connection with a guide head 1, and the guide head 1 plays a role in guiding a test probe to smoothly slide in a drill hole;
the tail plugging device 23 comprises two connectors III 7, a water leakage pipe 3 and a rubber bag 5, and the rubber bag is fixed between the two connectors III 7 through a fastening ring 21;
the outer part of the third joint 7 is in threaded connection with a circular baffle 11, and the diameter of the circular baffle 11 is larger than that of the rubber bag 5, so that the rubber bag 5 is prevented from falling off; the circle center baffle 11 is in threaded connection and can be disassembled, so that the rubber bag 5 is convenient to replace;
an external water source enters the plugging cavity 27 through water leakage holes 33 in the front plugging device 30 and the tail plugging device 31, and a water injection cavity 26 is formed between the rubber bag 5 and the drill hole 28 corresponding to expansion;
the number of the converters 6 is one, the whole converter is cylindrical, a step through hole is formed in the middle of the converter, and the left end and the right end of the converter are respectively in threaded connection with the communicating pipe 25 and the connector II 4;
four side leakage holes 35, four water distribution holes 19 and an inwards concave water collection tank 18 are symmetrically arranged in the converter 6 and around the middle circular hole, and the water collection tank 18 is positioned on the right side of the water distribution holes 19 and is communicated with the water distribution holes 19; the outer wall of the water diversion hole 19 is provided with a boss 20 and a cross screw sleeve 29, the boss 20 plays a limiting role, and the cross screw sleeve 29 is in threaded connection with the outer wall of the water diversion hole 19 and rotates on the cross screw sleeve;
the inner ring 34 is in a cylindrical ring shape, the left end surface is larger than the right end surface, and the inner ring is sleeved outside the stepped through hole; the outer wall of the inner ring 34 forms a 30-degree sealing conical surface 23 matched with the inner wall of the converter 6 for sealing, 4L-shaped water through holes 17 are correspondingly arranged in the inner part and correspondingly communicated with the side leakage hole 35, and the side leakage hole 35 is communicated with the stepped through hole;
the inner ring 34 slides left and right along the inner part, in the initial state, due to the action of the spring 22, the inner ring 34 is positioned at the right end, the water through hole 17 is sealed, when an external water source acts on the right end surface of the inner ring 34 through the side leakage hole 35, the inner ring 34 moves left, and when the left end surface of the inner ring 34 is contacted with the boss 20, at the moment, the water through hole 17 is just communicated with the water collecting tank 18, and the external water source is discharged into the water injection cavity 26 through the water distribution hole 19;
the spring 22 is positioned between the inner ring 34 and the cross wire sleeve 29, and the tension degree of the spring 22 is changed by adjusting the cross wire sleeve 29, so that the opening pressure of the inner ring 34 is controlled; the cross wire sleeve 29 is provided with four rectangular baffles, the periphery of the cross wire sleeve is hollow, so that the cross wire sleeve is convenient to rotate and adjust by using an external tool, and a water source in the water injection cavity 26 passes through the cross wire sleeve and acts on the left end face of the inner ring 34 in a feedback manner;
the communicating pipes 25 are sealed hollow pipes, and the number of the communicating pipes is 1;
the working principle of the converter 6 is as follows:
(1) when the inner ring 34 satisfies PLeft side ofSRing left side+kx≤PRight sideSRing rightWhen the water is filled into the water injection cavity 26, the inner ring 34 moves leftwards, the water through hole 17 is communicated with the water collecting tank 18, and a water source conducts water injection observation to the water injection cavity 26 through the water distribution hole 19;
(2) when the inner ring 34 satisfies PLeft side ofSRing left side+kx≥PRight sideSRing rightWhen the water is filled, the inner ring 34 moves rightwards, the water through hole 17 is sealed by the pipe wall, and water supply to the water filling cavity 26 is stopped;
wherein, PLeft side ofObserving the water source pressure for the low pressure of the water injection cavity side, wherein the water source pressure is generally about 0.2-0.5 MPa; pRight sideThe pressure of the high-pressure water source provided for the communicating pipe is generally about 0.8-1 MPa, and SRing left sideIs the water passing area, S, of the left end surface of the inner ringRing rightThe water passing area of the right end face of the inner ring is shown, k is the elastic coefficient of the outer spring, and x is the compression amount;
the water drain switch 12 is responsible for releasing pressure water in the sealed cavity 27 after the propulsion test is finished, so that the rubber bag 5 is separated from the drill hole 28, and the drilling machine 11 can conveniently propel the test probe; the master control switch 15 is responsible for stopping supplying of the external water source, the flow meter 13 is responsible for detecting the real-time water amount input to the test probe by the external water source, the readings of the mechanical pressure gauge 14 and the electronic pressure gauge 16 are compared and checked, and if the readings are approximately equal, the pressure is indicated to be effective.
The invention has the beneficial effects that:
(1) compared with the prior art, the device can realize two processes of plugging and observation by using the same external water source, ensure that the two processes work under respective pressure, reduce the number of pipelines in a drill hole to be 1, avoid the problem of winding of a drill rod and improve the stability of the working process.
(2) The device has the advantages that the converter realizes the conversion from a high-pressure water source to a low-pressure water source, the sealing conical surface of the inner ring is matched, the sealing performance and the opening pressure are improved, the compression degree of the spring is adjusted through the cross-shaped screw sleeve, the inner ring is controlled to have different opening and conversion pressures, the pressure adjusting range of the converter is wider, the method is simple and convenient, the process is stable, and the device can meet different working requirements.
(3) The design of water catch bowl can solve the limbers and the not corresponding problem of distributive hole, guarantees no matter how the inner ring rotates, and the water in its limbers all can flow to the distributive hole through the water catch bowl, and the distributive hole opening designs with drilling parallel simultaneously, has alleviateed because the direct impact effect of rivers to the drilling wall.
Drawings
FIG. 1 is a schematic diagram of the overall structure and observation state of the variable-pressure adjustable rock mass fracture permeability testing device of the invention;
FIG. 2 is a schematic diagram of the pressure relief propulsion state of the variable pressure adjustable rock mass fracture permeability testing device of the invention;
FIG. 3 is a schematic structural diagram of a test probe in the variable-pressure adjustable rock mass fracture permeability test device of the present invention;
FIG. 4 is a schematic structural diagram of a front plugging device in the variable-pressure adjustable rock mass fracture permeability testing device of the invention;
FIG. 5 is a schematic structural diagram of a tail plugging device in the variable-pressure adjustable rock mass fracture permeability testing device of the invention;
FIG. 6 is a schematic diagram of a cross-sectional structure of a converter in the variable-pressure adjustable rock mass fracture permeability testing device of the invention;
FIG. 7 is a left side view of a converter in the variable pressure adjustable rock mass fracture permeability testing apparatus of the present invention;
FIG. 8 is a right side view of a converter in the variable pressure adjustable rock mass fracture permeability testing apparatus of the present invention;
FIG. 9(a) is a schematic view of a static state of a converter in the variable-pressure adjustable rock mass fracture permeability testing device according to the present invention;
FIG. 9(b) is a schematic view of the working state of a converter in the variable-pressure adjustable rock mass fracture permeability testing apparatus according to the present invention;
FIG. 10 is a schematic diagram of an inner ring structure of the variable-pressure adjustable rock mass fracture permeability testing device according to the present invention;
FIG. 11 is a schematic diagram of a cross-shaped wire sleeve structure in the variable-pressure adjustable rock fracture permeability testing device.
In the figure: 1, a guide head; 2, connecting the first joint; 3, a water leakage pipe; 4, a second joint; 5, a rubber bag; 6 a converter; 7, a joint III; 8, a circular baffle plate; 9, drilling a drill pipe; 10 high-pressure hose; 11, a drilling machine; 12 a water discharging switch; 13 flow meter; 14 mechanical pressure gauge; 15, a master control switch; 16 electronic pressure gauges; 17 water through holes; 18 a water collection sump; 19 water distribution holes; 20 bosses; 21 fastening ring; 22 a spring; 23 sealing the conical surface; 24 rock mass to be measured; 25 communicating pipes; 26 water injection cavity; 27 plugging the cavity; 28, drilling a hole; 29 a cross-hair sleeve; 30 a front occluder; 31 a tail occluder; 32 control console; 33 water leakage holes; 34 an inner ring; and 35 side leakage holes.
Detailed Description
The following further describes a specific embodiment of the present invention with reference to the drawings and technical solutions.
A variable-pressure adjustable rock mass fracture permeability testing device comprises a plugging device, a converter 6, a communicating pipe 25, a drilling machine 11, a drill rod 9 and a control operation table 32; the occluder further comprises a front occluder 30 and a rear occluder 31;
the converter 6 is connected to the tail part of the front plugging device 30 in a threaded manner, the interior of the converter comprises an inner ring 34, a spring 22 and a cross wire sleeve 29, and the compression degree of the spring 22 is changed by adjusting the position of the cross wire sleeve 29 so as to control the opening pressure of the inner ring 34; after the front plugging device 30 and the tail plugging device 31 are expanded, a water injection cavity 26 is formed by the front plugging device and the drill hole 28, and external high-pressure water enters the water injection cavity 26 through the converter 6 to detect the crack permeability of the drill hole 28;
the drilling machine 11 is connected with the test probe through a drill rod 9 and used for lengthening and propelling the test probe to a designated area, the drill rod 9 is a hollow rod, an external high-pressure water source can be conveyed inside the hollow rod, and the drill rod 9 is in threaded connection with the test probe and can be detached;
the control operation platform 32 is connected with the drill rod 9 through a high-pressure hose 10 and comprises a water discharge switch 12, a flow meter 13, a mechanical pressure gauge 14, a master control switch 15 and an electronic pressure gauge 16, and the control operation platform 32 is responsible for providing a water source with preset pressure, releasing pressure and discharging water, and detecting and recording parameters such as pressure, flow and the like;
the front plugging device 30 comprises a first connector 2, a water leakage pipe 3, a second connector 4 and a rubber bag 5, wherein the first connector 2 and the second connector 4 are in threaded connection with the water leakage pipe 3, the rubber bag 5 is wound outside the water leakage pipe 3 and fixed outside the first connector 2 and the second connector 4 through a fastening ring 24 to form a plugging cavity 27 with the water leakage pipe 3; the outer end of the first connector 2 is in threaded connection with a guide head 1, and the guide head 1 plays a role in guiding a test probe to smoothly slide in a drill hole;
the tail plugging device 23 comprises two connectors III 7, a water leakage pipe 3 and a rubber bag 5, and the rubber bag is fixed between the two connectors III 7 through a fastening ring 21;
the outer part of the third joint 7 is in threaded connection with a circular baffle 11, and the diameter of the circular baffle 11 is larger than that of the rubber bag 5, so that the rubber bag 5 is prevented from falling off; the circle center baffle 11 is in threaded connection and can be disassembled, so that the rubber bag 5 is convenient to replace;
an external water source enters the plugging cavity 27 through water leakage holes 33 in the front plugging device 30 and the tail plugging device 31, and a water injection cavity 26 is formed between the rubber bag 5 and the drill hole 28 corresponding to expansion;
the number of the converters 6 is one, the whole converter is cylindrical, a step through hole is formed in the middle of the converter, and the left end and the right end of the converter are respectively in threaded connection with the communicating pipe 25 and the connector II 4;
four side leakage holes 35, four water distribution holes 19 and an inwards concave water collection tank 18 are symmetrically arranged in the converter 6 and around the middle circular hole, and the water collection tank 18 is positioned on the right side of the water distribution holes 19 and is communicated with the water distribution holes 19; the outer wall of the water diversion hole 19 is provided with a boss 20 and a cross screw sleeve 29, the boss 20 plays a limiting role, and the cross screw sleeve 29 is in threaded connection with the outer wall of the water diversion hole 19 and rotates on the cross screw sleeve;
the inner ring 34 is in a cylindrical ring shape, the left end surface is larger than the right end surface, and the inner ring is sleeved outside the stepped through hole; the outer wall of the inner ring 34 forms a 30-degree sealing conical surface 23 matched with the inner wall of the converter 6 for sealing, 4L-shaped water through holes 17 are correspondingly arranged in the inner part and correspondingly communicated with the side leakage hole 35, and the side leakage hole 35 is communicated with the stepped through hole;
the inner ring 34 slides left and right along the inner part, in the initial state, due to the action of the spring 22, the inner ring 34 is positioned at the right end, the water through hole 17 is sealed, when an external water source acts on the right end surface of the inner ring 34 through the side leakage hole 35, the inner ring 34 moves left, and when the left end surface of the inner ring 34 is contacted with the boss 20, at the moment, the water through hole 17 is just communicated with the water collecting tank 18, and the external water source is discharged into the water injection cavity 26 through the water distribution hole 19;
the spring 22 is positioned between the inner ring 34 and the cross wire sleeve 29, and the tension degree of the spring 22 is changed by adjusting the cross wire sleeve 29, so that the opening pressure of the inner ring 34 is controlled; the cross wire sleeve 29 is provided with four rectangular baffles, the periphery of the cross wire sleeve is hollow, so that the cross wire sleeve is convenient to rotate and adjust by using an external tool, and a water source in the water injection cavity 26 passes through the cross wire sleeve and acts on the left end face of the inner ring 34 in a feedback manner;
the communicating pipes 25 are sealed hollow pipes, and the number of the communicating pipes is 1;
the working principle of the converter 6 is as follows:
(1) when the inner ring 34 satisfies PLeft side ofSRing left side+kx≤PRight sideSRing rightWhen the water is filled into the water injection cavity 26, the inner ring 34 moves leftwards, the water through hole 17 is communicated with the water collecting tank 18, and a water source conducts water injection observation to the water injection cavity 26 through the water distribution hole 19;
(2) when the inner ring 34 satisfies PLeft side ofSRing left side+kx≥PRight sideSRing rightAt this time, the inner ring 34 moves rightward, the water passage hole 17 is closed by the pipe wall, and the direction of the water passage hole stopsThe water injection cavity 26 supplies water;
wherein, PLeft side ofObserving the water source pressure for the low pressure of the water injection cavity side, wherein the water source pressure is generally about 0.2-0.5 MPa; pRight sideThe pressure of the high-pressure water source provided for the communicating pipe is generally about 0.8-1 MPa, and SRing left sideIs the water passing area, S, of the left end surface of the inner ringRing rightThe water passing area of the right end face of the inner ring is shown, k is the elastic coefficient of the outer spring, and x is the compression amount;
the water drain switch 12 is responsible for releasing pressure water in the sealed cavity 27 after the propulsion test is finished, so that the rubber bag 5 is separated from the drill hole 28, and the drilling machine 11 can conveniently propel the test probe; the master control switch 15 is responsible for stopping supplying of the external water source, the flow meter 13 is responsible for detecting the real-time water amount input to the test probe by the external water source, the readings of the mechanical pressure gauge 14 and the electronic pressure gauge 16 are compared and checked, and if the readings are approximately equal, the pressure is indicated to be effective.
An observation method of a variable-pressure adjustable rock mass fracture permeability testing device comprises the following steps:
(1) and (3) construction of a drilling hole 28: according to the pre-designed construction requirement, 3-5 drill holes with different directions and inclination angles a are constructed in the rock mass 24 area to be measured by using the drilling machine 11, the diameter of the drill hole 28 is 89mm, the length of the drill hole is about 70m, and debris in the drill hole 28 is cleaned;
(2) installing equipment: installing a guide cone, a front plugging device 30, a tail plugging device 31, a converter 6 and a communicating pipe 25, sequentially connecting a drilling machine 11, a drill rod 9, a high-pressure hose 10 and a control operation platform 32, and then transferring a test probe to the initial position of a drilling hole 11 by using the drilling machine 11;
(3) and (3) sealing and checking: firstly, closing a water drain switch 12 of a control operation console 32, opening a master control switch 15, providing detection water pressure for a test probe, carrying out plugging tightness test on a rubber bag 5, if no obvious water leakage phenomenon exists, carrying out the next step of operation, otherwise, returning to the step (2) of operation, checking the connection and installation conditions among all parts, and then carrying out the step (3) of operation again until the rubber bag is qualified;
(4) carrying out pressurized water observation: after the sealing inspection is qualified, a water pressure test is carried out to detect the permeability of the hole section 28 of the drill hole, so that the test probe is in the initial position and is closed againA water drain switch 12 is turned on, a master control switch 15 is turned on, a high-pressure water source is provided for a test probe, the high-pressure water source enters a plugging cavity 27 through a communicating pipe 25 and a water leakage pipe 3, a rubber bag 5 of a front plugging device 30 and a tail plugging device 31 is expanded to form a water injection cavity 26 with a drill hole 28, the pressure of an external water source is adjusted to be gradually increased to 1.5MPa, the high-pressure water source is converted to a low-pressure detection water source through a converter 6 and then conveyed into the water injection cavity 26, and after the flow rate display number is stable, the display number Q of the flow rate meter atiAnd recording the detection distance Li；
(5) Pressure relief and propulsion: closing the master control switch 15, opening the water drain switch 12, releasing the pressure of the blocking cavity 27, closing the water drain switch 12 after the rubber bag 5 is separated from the drill hole 28, taking another drill rod 9 to lengthen the test probe, using the drill 11 to push the test probe to the next detection area, and repeating the operation of the step (4) until the length of the drill hole 28 is measured;
(6) calculating and analyzing: respectively drawing flow distribution maps in different drill holes 28 according to the lengths of the drill holes 28 and the water leakage amount of corresponding observation hole sections, analyzing permeability characteristics and fracture development characteristics of different positions in the length range of the drill holes 28, and further combining drill hole inclination angles a in different directions and accumulated continuous water leakage section length (namely permeability mutation zero point) LnAnd (n is 1+2+. and k), calculating the damage range of the rock mass with different spatial ranges.
Parts which are not described in the invention can be realized by adopting or referring to the prior art.
Although terms such as the transducer 6, inner ring 34, water diversion hole 19, etc. are used more often herein, the possibility of using other terms is not excluded, and simple substitutions of these terms by those skilled in the art in light of the present disclosure are intended to be within the scope of the present disclosure.
Claims (6)
1. The device for testing the permeability of the variable-pressure adjustable rock mass fracture is characterized by comprising a plugging device, a converter (6), a communicating pipe (25), a drilling machine (11), a drill rod (9) and a control operation table (32); the occluder further comprises a front occluder (30) and a rear occluder (31);
the converter (6) is in threaded connection with the tail of the front plugging device (30), the interior of the converter comprises an inner ring (34), a spring (22) and a cross wire sleeve (29), and the compression degree of the spring (22) is changed by adjusting the position of the cross wire sleeve (29), so that the opening pressure of the inner ring (34) is controlled;
an external water source is injected into the plugging cavity (27) through a water leakage hole (33) in the water leakage pipe (3) to expand the rubber bag (5), the front plugging device (30) and the tail plugging device (31) expand to form a water injection cavity (26) with the drill hole (28), and external high-pressure water enters the water injection cavity (26) through the converter (6) to detect the crack permeability of the drill hole (28);
the drilling machine (11) is connected with the test probe through a drill rod (9) and used for lengthening and propelling the test probe to a designated area, the drill rod (9) is a hollow rod, an external high-pressure water source can be conveyed inside the hollow rod, and the drill rod (9) is in threaded connection with the test probe and can be detached;
the control operation platform (32) is connected with the drill rod (9) through a high-pressure hose (10) and comprises a water drain switch (12), a flow meter (13), a mechanical pressure gauge (14), a master control switch (15) and an electronic pressure gauge (16), and the control operation platform (32) is responsible for providing a water source with preset pressure, releasing pressure and draining water, and detecting and recording pressure and flow;
an external water source enters the plugging cavity (27) through water leakage holes (33) in the front plugging device (30) and the tail plugging device (31), and a water injection cavity (26) is formed between the rubber bag (5) and the drill hole (28) in a swelling mode;
the number of the converters (6) is one, the whole converter is cylindrical, a step through hole is formed in the middle of the converter, and the left end and the right end of the converter are respectively in threaded connection with the communicating pipe (25) and the connector II (4);
four side leakage holes (35), four water distribution holes (19) and an inwards concave water collecting tank (18) are symmetrically arranged in the converter (6) and around the middle circular hole, and the water collecting tank (18) is positioned on the right side of the water distribution holes (19) and communicated with the water distribution holes (19); the outer wall of the water diversion hole (19) is provided with a boss (20) and a cross wire sleeve (29), the boss (20) plays a limiting role, and the cross wire sleeve (29) is in threaded connection with the outer wall of the water diversion hole (19) and rotates on the cross wire sleeve;
the inner ring (34) is in a cylindrical ring shape, the left end surface is larger than the right end surface, and the inner ring is sleeved outside the stepped through hole; the outer wall of the inner ring (34) forms a 30-degree sealing conical surface (23) matched with the inner wall of the converter (6) to play a role of sealing, 4L-shaped water through holes (17) are correspondingly arranged in the inner ring and correspondingly communicated with the side leakage holes (35), and the side leakage holes (35) are communicated with the stepped through holes;
the inner ring (34) slides left and right along the inner part, in an initial state, due to the action of the spring (22), the inner ring (34) is positioned at the right end, the water through hole (17) is sealed, when an external water source acts on the right end face of the inner ring (34) through the side leakage hole (35), the inner ring (34) moves left until the left end face of the inner ring (34) is contacted with the boss (20), at the moment, the water through hole (17) is just communicated with the water collecting tank (18), and the external water source is discharged into the water injection cavity (26) through the water distribution hole (19);
the spring (22) is positioned between the inner ring (34) and the cross wire sleeve (29), and the tensioning degree of the spring (22) is changed by adjusting the cross wire sleeve (29), so that the opening pressure of the inner ring (34) is controlled; the cross wire sleeve (29) is provided with four rectangular baffles, the periphery of the cross wire sleeve is hollow, so that the cross wire sleeve not only is convenient to rotate and adjust by using an external tool, but also is convenient for water sources in the water injection cavity (26) to pass through, and the water sources are fed back to act on the left end face of the inner ring (34);
the working principle of the converter (6) is as follows:
(1) when the inner ring (34) satisfies PLeft side ofSRing left side+kx≤PRight sideSRing rightWhen the water is injected into the water injection cavity (26) through the water diversion hole (19), the inner ring (34) moves leftwards, the water through hole (17) is communicated with the water collection tank (18), and a water source conducts water injection observation to the water injection cavity (26);
(2) when the inner ring (34) satisfies PLeft side ofSRing left side+kx≥PRight sideSRing rightWhen the water is filled, the inner ring (34) moves rightwards, the water through hole (17) is sealed by the pipe wall, and water supply to the water filling cavity (26) is stopped;
wherein, PLeft side ofObserving the water source pressure at the low pressure of the water injection cavity (26) side, wherein the water source pressure is 0.2-0.5 MPa; pRight sideThe pressure of the high-pressure water source provided for the communicating pipe (25) is 0.8-1 MPa, SRing left sideIs the water passing area S of the left end surface of the inner ring (34)Ring rightThe water passing area of the right end face of the inner ring (34), k is the elastic coefficient of the spring (22), and x is the compression amount;
the water drain switch (12) is responsible for releasing pressure water in the sealed cavity (27) after the propulsion test is finished, so that the rubber bag (5) is separated from the drill hole (28) to facilitate the drill (11) to propel the test probe; the master control switch (15) is responsible for stopping supplying of an external water source, the flow meter (13) is responsible for detecting the real-time water quantity input from the external water source to the test probe, readings of the mechanical pressure gauge (14) and the electronic pressure gauge (16) are compared and tested, and if the readings are approximately equal, the pressure is indicated to be effective.
2. The pressure-variable adjustable rock mass fracture permeability testing device as claimed in claim 1, wherein the front plugging device (30) comprises a first connector (2), a water leakage pipe (3), a second connector (4) and a rubber bag (5), the first connector (2) and the second connector (4) are in threaded connection with the water leakage pipe (3), the rubber bag (5) is wrapped outside the water leakage pipe (3) and fixed outside the first connector (2) and the second connector (4) through a fastening ring (24), and a plugging cavity (27) is formed between the rubber bag and the water leakage pipe (3); the outer end of the first connector (2) is in threaded connection with a guide head (1), and the guide head (1) plays a role in guiding the test probe to slide smoothly in a drill hole.
3. The pressure-variable adjustable rock mass fracture permeability testing device as claimed in claim 1 or 2, wherein the tail plugging device (31) comprises two connectors three (7), a water leakage pipe (3) and a rubber bag (5), and the rubber bag is fixed between the two connectors three (7) through a fastening ring (21).
4. The pressure-variable adjustable rock mass fracture permeability testing device as claimed in claim 3, wherein the joint III (7) is externally screwed with a circular baffle (8), and the diameter of the circular baffle (8) is larger than that of the rubber bag (5) so as to prevent the rubber bag (5) from falling off; the round baffle (8) is in threaded connection and can be disassembled, so that the rubber bag (5) can be conveniently replaced.
5. The pressure-variable adjustable rock mass fracture permeability testing device as claimed in claim 1, 2 or 4, wherein the communicating pipes (25) are sealed hollow pipes, and the number of the communicating pipes is 1.
6. The pressure-variable adjustable rock mass fracture permeability testing device as claimed in claim 3, wherein the communicating pipes (25) are sealed hollow pipes, and the number of the communicating pipes is 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810375922.9A CN108444889B (en) | 2018-04-20 | 2018-04-20 | Variable-pressure adjustable rock mass fracture permeability testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810375922.9A CN108444889B (en) | 2018-04-20 | 2018-04-20 | Variable-pressure adjustable rock mass fracture permeability testing device |
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