Expansion capacity verification system of borehole dilatometer and verification method using expansion capacity verification system

Abstract

The invention provides an expansion capacity verification system of a borehole dilatometer. Comprising a first hydraulic pump, an oil outlet pipe pressure gauge, an oil return pipe pressure gauge, a displacement sensor, a hydraulic sensor used for detecting the hydraulic pressure of an oil outlet pipeline, a calibration liquid containing cavity shell, a water drainage pipe used for draining measurement water, a hydraulic sensor used for measuring the displacement variation of a hydraulic push rod and a signal input device. The front section part of the metal structure shell of the borehole dilatometer is embedded into the calibration liquid cavity shell from the opening of the calibration liquid cavity shell; a second enamel disc is annularly arranged on an opening of the calibration liquid containing cavity shell, a first enamel disc is arranged on the outer wall of the rear section part of the metal structure shell of the borehole dilatometer in a sleeving manner, and a measurement water body sealing cavity is formed between the calibration liquid containing cavity shell and the front section part through sealing installation of the two enamel discs; the invention provides a verification method using the verification system. According to the invention, the calibration accuracy of the expansion amount of the borehole dilatometer is improved, and detection, installation and debugging are facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of calibration of borehole expansion meters for hydropower and water conservancy projects, and in particular to an expansion amount calibration system for a borehole expansion meter and a calibration method using the same. Background Art

[0002] In the "Rock Test Code for Hydropower and Water Conservancy Projects" (DL / T 5368-2007), it is stipulated that borehole expansion meter or borehole jack can be used for the radial pressure test of complete and relatively complete rock mass. The structural diagram of the borehole expansion meter is shown in the attached manual. Figure 1 As shown, the borehole expansion meter uses a third hydraulic pump 31, a third hydraulic pipeline 33, a third hydraulic module 36 and a third control valve 37 to expand a third expansion module 38 (the third expansion module 38 includes a third rubber bag 39) so as to squeeze the rock mass for testing, and the expansion amount and the pressure value of the third expansion module 38 are displayed and recorded by a third reading instrument 41;

[0003] In order to ensure the accuracy of the test data, the force value and expansion amount displayed by the third reading instrument 41 must be consistent with the actual generation by the third expansion module 38; currently in the industry, there are only devices for checking (calibrating) the force value of the drilling expansion meter, but there is a lack of devices for calibrating its expansion amount. Summary of the invention

[0004] In view of this, it is necessary to propose a borehole expansion meter expansion calibration system and a calibration method using the same to address the above-mentioned problems, so as to overcome some shortcomings in the above-mentioned background technology and solve the following technical problems: how to improve the accuracy of the borehole expansion meter expansion calibration under the conditions of convenient installation and calibration.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] The present invention provides an expansion amount calibration system for a borehole dilatometer, which is used to calibrate a borehole dilatometer. The borehole dilatometer includes a metal structure housing, an outward expansion membrane sleeve, and an oil-sealed hydraulic push rod mechanism; the metal structure housing serves as the main body of the borehole dilatometer and has a tubular structure; the metal structure housing includes an integral front section and a rear section. The front section can be reset and expanded under internal water pressure, and the rear section squeezes water to the front section through hydraulic pressure; a water flow channel is provided inside the metal structure housing, and a water storage cavity is provided inside the rear section; the outward expansion membrane sleeve is sleeved on the outer wall of the front section, and the edge of the outward expansion membrane sleeve is sealed with the outer wall of the front section; when the water pressure on the inner membrane surface of the outward expansion membrane sleeve is greater than a certain amount, a water-filled variable space is formed between the inner membrane surface of the outward expansion membrane sleeve and the outer wall of the front section, and both ends of the water flow channel are respectively communicated with the water storage cavity and the water-filled variable space; when the water pressure on the inner membrane surface of the outward expansion membrane sleeve is not greater than another certain amount, a gap is formed between the inner membrane surface of the outward expansion membrane sleeve and the outer wall of the front section; the oil-sealed hydraulic push rod mechanism is arranged inside the rear section and is located behind the water storage cavity; the oil-sealed hydraulic push rod mechanism is used to change the volume of the water storage cavity through the hydraulic push rod of the oil-sealed hydraulic push rod mechanism, so as to change the volume of the water-filled variable space. The expansion amount calibration system includes:

[0007] A first hydraulic pump, which is arranged outside the metal structure housing; the first hydraulic pump hydraulically controls the movement of the hydraulic push rod of the oil-sealed hydraulic push rod mechanism through an oil outlet pipe and an oil return pipe;

[0008] An oil outlet pipe pressure gauge, which is used to detect the oil outlet pressure of the oil outlet pipe;

[0009] An oil return pipe pressure gauge, which is used to detect the oil return pressure of the oil return pipe;

[0010] A displacement sensor, which is arranged inside the rear section and is used to detect the displacement change amount of the hydraulic push rod of the oil-sealed hydraulic push rod mechanism and output the displacement change amount signal in real time;

[0011] A calibration liquid cavity housing, which has a tubular structure; one end of the calibration liquid cavity housing is transversely cut and opened, and the front section is inserted into the calibration liquid cavity housing from the opening of the calibration liquid cavity housing; a second enamel plate is provided on the opening ring of the calibration liquid cavity housing, and a first enamel plate is sleeved on the outer wall of the rear section; a measurement water body sealed chamber is formed between the calibration liquid cavity housing and the front section through the sealed installation of the second enamel plate and the first enamel plate; the outer membrane surface of the outward expansion membrane sleeve is a part of the inner side wall of the measurement water body sealed chamber. When the outward expansion membrane sleeve expands outward, the volume of the water-filled variable space becomes larger, and the volume of the measurement water body sealed chamber becomes smaller;

[0012] A drain pipe, one end of which is connected to the outside, and the other end of which is connected to the sealed chamber of the measuring water body, and is used to discharge the measuring water when the volume of the sealed chamber of the measuring water body becomes smaller;

[0013] A hydraulic sensor, used to detect the hydraulic pressure of the oil outlet pipeline and output the hydraulic pressure detection signal in real time;

[0014] The signal input device is respectively connected to the hydraulic pressure sensor and the displacement sensor for communication.

[0015] Furthermore, a gas exhaust branch pipe is provided on the side wall of the drain pipe.

[0016] Furthermore, a water injection branch pipe is provided on the side wall of the exhaust branch pipe.

[0017] Furthermore, the other end of the calibration liquid chamber housing is sealed by a sealing end cover, and the drain pipe seal passes through the sealing end cover and is connected to the sealed chamber of the measuring water body.

[0018] Furthermore, the expansion amount calibration system of the borehole expansion meter also includes an electronic scale;

[0019] The electronic scale is in communication connection with the signal input device; the electronic scale is used to weigh the measuring water body flowing out of the measuring water body sealed chamber through the drain pipe.

[0020] Furthermore, the expansion amount verification system of the borehole expansion meter also includes:

[0021] An electronic scale for weighing the measured water flowing out of the sealed chamber of the measured water through the drain pipe;

[0022] The host computer is connected to the signal input device for communication and is used to analyze the real-time detection data.

[0023] The present invention further proposes a calibration method for an expansion calibration system using the borehole expansion meter as described above, comprising the following steps:

[0024] S1, installing the expansion calibration system of the borehole expansion meter and filling the borehole expansion meter with pure water and completing the exhaust, and then executing S2; in step S1, before installing the calibration liquid chamber housing, first test whether the borehole expansion meter is faulty, and if the borehole expansion meter is not faulty, continue to complete S1;

[0025] S2, controlling the hydraulic push rod of the oil seal hydraulic push rod mechanism by the first hydraulic pump to compress the volume of the water containing chamber; then executing S3;

[0026] S3, measuring the amount of water discharged from the drainage pipe, and setting the amount of water as the expansion amount of the borehole expansion meter; then executing S4;

[0027] S4, dividing the test samples into multiple groups corresponding to different discharge water amounts according to the maximum expansion amount of the borehole expansion meter, and testing the samples one by one according to the different discharge water amounts, i.e., repeatedly executing S2 and S3 for multiple times, and then executing S5; before each repetition of S2, the borehole expansion meter needs to be refilled with pure water and vented;

[0028] S5, respectively verifying the real-time detection signal of the signal input device corresponding to the multiple groups of sample tests obtained in S4, the reading of the oil outlet pipe pressure gauge, the reading of the oil return pipe pressure gauge, and the amount of water discharged from the drain pipe and weighed by the electronic scale.

[0029] Furthermore, the verification method further comprises the following steps:

[0030] S6, determining the relationship between the real-time detection signal of the upper computer verification signal input device, the reading of the oil outlet pipe pressure gauge, the reading of the oil return pipe pressure gauge and the amount of water discharged from the drain pipe and weighed by the electronic scale.

[0031] Further, in S5, the detection expansion amount V of the borehole expansion meter is obtained by the host computer. 1 ;

[0032] And obtain the relative error δ of the borehole expansion meter v ;

[0033] Borehole expansion meter relative error δ v The formula is:

[0034]

[0035] In formula (1), V 2 It is the amount of water discharged from the drain pipe during the test.

[0036] Further, when the expansion amount V detected by the borehole expansion meter under the pressure of each level of the first hydraulic pump is 1 When it is not greater than a threshold, the borehole expansion meter is judged to be in a normal state.

[0037] The beneficial effects of the present invention are:

[0038] The invention improves the accuracy of expansion calibration of the borehole expansion meter, is convenient for detection, installation and debugging, and is also convenient to carry; especially at the installation site of a water conservancy project, the invention can realize rapid installation and accurate calibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a structural schematic diagram of a borehole expansion meter in the prior art;

[0040] Figure 2 It is a front structural cross-sectional view of an expansion amount calibration system of a borehole expansion meter according to the present invention;

[0041] Figure 3 for Figure 2 AA cross-sectional view;

[0042] Description of reference numerals:

[0043] The third hydraulic pump 31; the third pressure gauge 32; the third hydraulic pipeline 33; the third cable 34; the third lifting device 35; the third hydraulic module 36; the third control valve 37; the third expansion module 38; the third rubber bag 39; the third electronic compartment 40; the third reading instrument 41; the metal structure shell 14; the outward expansion membrane sleeve 19; the oil seal hydraulic push rod mechanism 16; the water channel 700; the water chamber 17; the first hydraulic pump 11; the oil outlet pipeline 13; the oil return pipeline 500; oil outlet pipe pressure gauge 12; oil return pipe pressure gauge 800; displacement sensor 15; calibration liquid chamber housing 18; first enamel plate 300; second enamel plate 400; measuring water body sealed chamber 900; drain pipe 200; signal input device 600; exhaust branch pipe 2001; water injection branch pipe 2002; hydraulic sensor 1000; first piston 161; hydraulic push rod 162; second piston 164; sealing collar 163; oil chamber 165. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be further clearly and completely described in combination with the embodiments of the present invention. It should be noted that the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0045] It should be understood that the directions or positional relationships indicated by terms such as "upper", "lower", "front", "back", "left", and "right" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0046] The terms "first", "second", "third", "fourth", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the definition of "first", "second", "third", "fourth" features may explicitly or implicitly include one or more of the features.

[0047] Example

[0048] like Figure 2 , Figure 3As shown:

[0049] The present embodiment provides a borehole expansion meter expansion amount calibration system for calibrating a borehole expansion meter, the borehole expansion meter comprising a metal structure shell 14, an outward expansion membrane sleeve 19 and an oil seal hydraulic push rod mechanism 16; the metal structure shell 14 is a main body of the borehole expansion meter and is a tubular barrel structure; the metal structure shell 14 comprises an integral front section and a rear section, the front section can be reset and expanded after being subjected to internal water pressure, and the rear section is hydraulically squeezed to the front section; a water flow channel 700 is provided in the metal structure shell 14, and a water containing cavity 17 is provided in the rear section; the outward expansion membrane sleeve 19 is sleeved on the outer wall of the front section, and the edge of the outward expansion membrane sleeve 19 is sealed with the outer wall of the front section; when the outward expansion membrane sleeve 1 When the water pressure on the inner membrane surface of the outwardly expanding membrane sleeve 19 is greater than a certain amount, a water-filled variable space is formed between the inner membrane surface of the outwardly expanding membrane sleeve 19 and the outer wall of the front section, and the two ends of the water flow channel 700 are connected to the water-containing chamber 17 and the water-filled variable space respectively; when the water pressure on the inner membrane surface of the outwardly expanding membrane sleeve 19 is not greater than another certain amount, a gap is formed between the inner membrane surface of the outwardly expanding membrane sleeve 19 and the outer wall of the front section; the oil-sealed hydraulic push rod mechanism 16 is arranged in the rear section and is located at the rear side of the water-containing chamber 17; the oil-sealed hydraulic push rod mechanism 16 is used to change the volume of the water-containing chamber 17 through the hydraulic push rod 162 of the oil-sealed hydraulic push rod mechanism 16, thereby changing the volume of the water-filled variable space, and the expansion amount verification system includes:

[0050] The first hydraulic pump 11 is arranged outside the metal structure housing 14; the first hydraulic pump 11 hydraulically controls the movement of the hydraulic push rod 162 of the oil seal hydraulic push rod mechanism 16 through an oil outlet pipeline 13 and an oil return pipeline 500;

[0051] The oil outlet pipe pressure gauge 12 is used to detect the outlet oil pressure of the oil outlet pipeline 13;

[0052] The oil return pipe pressure gauge 800 is used to detect the oil return pressure of the oil return pipe 500;

[0053] The displacement sensor 15 is arranged in the rear section, and is used to detect the displacement change of the hydraulic push rod 162 of the oil seal hydraulic push rod mechanism 16 and output the displacement change signal in real time;

[0054] The calibration liquid storage chamber shell 18 is in a tubular barrel structure; one end of the calibration liquid storage chamber shell 18 is cross-sectionally opened, and the front section is embedded in the calibration liquid storage chamber shell 18 from the opening of the calibration liquid storage chamber shell 18; the opening ring of the calibration liquid storage chamber shell 18 is provided with a second enamel disk 400, and the outer wall of the rear section is provided with a first enamel disk 300; a measuring water body sealed chamber 900 is formed between the calibration liquid storage chamber shell 18 and the front section through the sealing installation of the second enamel disk 400 and the first enamel disk 300; the outer membrane surface of the outward expansion membrane sleeve 19 is a part of the inner side wall of the measuring water body sealed chamber 900, and when the outward expansion membrane sleeve 19 expands outward, the volume of the water-filled variable space increases, and the volume of the measuring water body sealed chamber 900 decreases;

[0055] A drain pipe 200, one end of which is connected to the outside, and the other end of which is connected to the measuring water sealed chamber 900, for discharging the measuring water when the volume of the measuring water sealed chamber 900 becomes smaller;

[0056] The hydraulic pressure sensor 1000 is used to detect the hydraulic pressure of the oil outlet pipeline 13 and output the hydraulic pressure detection signal in real time;

[0057] The signal input device 600 is communicatively connected to the hydraulic pressure sensor 1000 and the displacement sensor 15 respectively.

[0058] In a further optimized manner, the oil outlet pipe pressure gauge 12 is calibrated by cooperating with the hydraulic sensor 1000 , the displacement sensor 15 and the oil return pipe pressure gauge 800 .

[0059] Optimally, a side wall of the drain pipe 200 is also provided with an exhaust branch pipe 2001 .

[0060] Further optimized, the exhaust port of the exhaust branch pipe 2001 is higher in level than the water outlet of the measuring water body sealed chamber 900 .

[0061] Optimally, a water injection branch pipe 2002 is also provided on the side wall of the exhaust branch pipe 2001 .

[0062] Optimally, the other end of the calibration liquid chamber housing 18 is sealed by a sealed end cover, and the drain pipe 200 seals through the sealed end cover and communicates with the measurement water body sealed chamber 900 .

[0063] One of the optimization solutions is that the expansion amount verification system of the borehole expansion meter also includes an electronic scale;

[0064] The electronic scale is in communication connection with the signal input device 600 ; the electronic scale is used to weigh the measurement water flowing out of the measurement water sealing chamber 900 through the drain pipe 200 .

[0065] Further optimized, or the electronic scale of the expansion amount calibration system of the borehole expansion meter is directly connected to the host computer for communication.

[0066] Another optimization scheme is that the expansion amount verification system of the borehole expansion meter also includes:

[0067] An electronic scale for weighing the measurement water flowing out of the measurement water sealed chamber (900) through the drainage pipe (200);

[0068] The host computer is connected to the signal input device 600 for communication and is used to analyze the real-time detection data.

[0069] In a further optimized manner, the measurement results of the electronic scale are calibrated by the detection data of the host computer.

[0070] This embodiment further proposes a calibration method for an expansion calibration system using a borehole expansion meter as described in any one of the above technical solutions, comprising the following steps:

[0071] S1, installing the expansion calibration system of the borehole expansion meter and filling the borehole expansion meter with pure water and completing the exhaust, and then executing S2; in step S1, before installing the calibration liquid chamber housing 18, first test whether the borehole expansion meter is faulty, and if the borehole expansion meter is not faulty, continue to complete S1;

[0072] S2, controlling the hydraulic push rod 162 of the oil seal hydraulic push rod mechanism 16 by the first hydraulic pump 11 to compress the volume of the water containing chamber 17; then executing S3;

[0073] S3, measuring the amount of water discharged from the drainage pipe 200, and setting the amount of water as the expansion amount of the borehole expansion meter; then executing S4;

[0074] S4, dividing the test samples into multiple groups corresponding to different discharge water amounts according to the maximum expansion amount of the borehole expansion meter, and testing the samples one by one according to the different discharge water amounts, i.e., repeatedly executing S2 and S3 for multiple times, and then executing S5; before each repetition of S2, the borehole expansion meter needs to be refilled with pure water and vented;

[0075] S5, respectively verifying the real-time detection signal of the signal input device 600 corresponding to the multiple groups of sample tests obtained in S4, the reading of the oil outlet pipe pressure gauge 12, the reading of the oil return pipe pressure gauge 800, and the amount of water discharged from the drain pipe 200 and weighed by the electronic scale.

[0076] Optimally, the verification method further comprises the following steps:

[0077] S6, determining the relationship between the real-time detection signal of the upper computer verification signal input device 600, the reading of the oil outlet pipe pressure gauge 12, the reading of the oil return pipe pressure gauge 800 and the amount of water discharged from the drain pipe 200 and weighed by the electronic scale.

[0078] Optimally, in S5, the detection expansion amount V of the borehole expansion meter is obtained by the host computer 1 ;

[0079] And obtain the relative error δ of the borehole expansion meter v ;

[0080] Relative error of borehole expansion meter δ v The formula is:

[0081]

[0082] In formula (1), V 2 It is the amount of water discharged from the drain pipe 200 during the test.

[0083] Optimally, when the expansion amount V detected by the borehole expansion meter under the pressure of each level of the first hydraulic pump 11 is 1 When it is not greater than a threshold, the borehole expansion meter is judged to be in a normal state; specifically, the relative error δ of the borehole expansion meter under each level of pressure v Less than or equal to ±0.5% can be used to judge that the reading screen (the upper computer screen or the screen of the signal input device 600) is accurate. The relative error δ of the borehole expansion meter is v If it is greater than ±0.5%, the screen used for reading should be adjusted according to the amount of water discharged from the drain pipe 200 during the test, so as to achieve the purpose of calibrating the expansion volume of the borehole expansion meter.

[0084] Specifically, the outward expansion membrane sleeve 19 (preferably a rubber bag) of the borehole dilatometer is inserted as a whole into the calibration liquid chamber shell 18 and sealed, the calibration liquid chamber shell 18 is filled with pure water and exhausted, and the volume of water discharged from the calibration liquid chamber shell 18 during the expansion process of the borehole dilatometer is the expansion amount of the dilatometer.

[0085] Specifically, in S4, five points are evenly taken for expansion verification, and the first hydraulic pump 11 is used to pressurize. After the volume indication on the screen for reading is stable, the expansion amount V detected by the borehole expansion meter on the screen for reading is read. 1 , use an electronic scale to weigh the mass m of the discharged water, measure the water temperature T, the density of pure water is determined according to relevant regulations, and the volume of discharged pure water (the amount of water discharged from the drain pipe 200 during the test V 2 ), calculate the relative error δ of the borehole expansion meter according to formula (1) v .

[0086] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A borehole expansion meter expansion calibration system, used for calibrating a borehole expansion meter, the borehole expansion meter comprising a metal structure shell (14), an outward expansion membrane sleeve (19) and an oil seal hydraulic push rod mechanism (16); the metal structure shell (14) is a main body of the borehole expansion meter, and is a tubular barrel structure; the metal structure shell (14) comprises an integral front section and a rear section, the front section can be reset and expanded after being subjected to internal water pressure, and the rear section is hydraulically squeezed to the front section; a water flow channel (700) is provided in the metal structure shell (14), and a water containing cavity (17) is provided in the rear section; the outward expansion membrane sleeve (19) is sleeved on the outer wall of the front section, and the edge of the outward expansion membrane sleeve (19) is sealed with the outer wall of the front section; when the outward expansion membrane sleeve (19) is 9), when the water pressure on the inner membrane surface of the outwardly expanding membrane sleeve (19) is greater than a certain amount, a water-filled variable space is formed between the inner membrane surface of the outwardly expanding membrane sleeve (19) and the outer wall of the front section, and the two ends of the water flow channel (700) are respectively connected to the water-containing chamber (17) and the water-filled variable space; when the water pressure on the inner membrane surface of the outwardly expanding membrane sleeve (19) is not greater than another certain amount, a gap is formed between the inner membrane surface of the outwardly expanding membrane sleeve (19) and the outer wall of the front section; the oil-sealed hydraulic push rod mechanism (16) is arranged in the rear section and is located at the rear side of the water-containing chamber (17); the oil-sealed hydraulic push rod mechanism (16) is used to change the volume of the water-containing chamber (17) through the hydraulic push rod (162) of the oil-sealed hydraulic push rod mechanism (16), thereby changing the volume of the water-filled variable space, and is characterized in that The expansion verification system includes: A first hydraulic pump (11) is arranged outside the metal structure housing (14); the first hydraulic pump (11) hydraulically controls the movement of a hydraulic push rod (162) of the oil-sealed hydraulic push rod mechanism (16) through an oil outlet pipeline (13) and an oil return pipeline (500); An oil outlet pipe pressure gauge (12) for detecting the outlet oil pressure of the oil outlet pipeline (13); An oil return pipe pressure gauge (800), used for detecting the oil return pressure of the oil return pipe (500); A displacement sensor (15) is arranged in the rear section and is used to detect the displacement change of the hydraulic push rod (162) of the oil seal hydraulic push rod mechanism (16) and output the displacement change signal in real time; The calibration liquid storage chamber shell (18) is in a tubular barrel structure; one end of the calibration liquid storage chamber shell (18) is cross-sectionally opened, and the front section is embedded in the calibration liquid storage chamber shell (18) from the opening of the calibration liquid storage chamber shell (18); the opening ring of the calibration liquid storage chamber shell (18) is provided with a second enamel disk (400), and the outer wall of the rear section is provided with a first enamel disk (300); through the sealing installation of the second enamel disk (400) and the first enamel disk (300), the calibration liquid storage chamber shell (18) and the front section form a water body sealed chamber (900) for measuring water; the outer membrane surface of the outward expansion membrane sleeve (19) is a part of the inner side wall of the water body sealed chamber (900), and when the outward expansion membrane sleeve (19) expands outward, the volume of the water-filled variable space increases, and the volume of the water body sealed chamber (900) decreases; A drainage pipe (200), one end of which is connected to the outside, and the other end of which is connected to the measuring water body sealed chamber (900), and is used to discharge the measuring water when the volume of the measuring water body sealed chamber (900) becomes smaller; A hydraulic pressure sensor (1000) for detecting the hydraulic pressure of the oil outlet pipeline (13) and outputting the hydraulic pressure detection signal in real time; The signal input device (600) is communicatively connected to the hydraulic pressure sensor (1000) and the displacement sensor (15) respectively.

2. The expansion calibration system of the borehole expansion meter according to claim 1, characterized in that: The side wall of the drainage pipe (200) is also provided with an exhaust branch pipe (2001).

3. The expansion amount calibration system of the borehole expansion meter according to claim 2, characterized in that: A water injection branch pipe (2002) is also provided on the side wall of the exhaust branch pipe (2001).

4. The expansion calibration system of the borehole expansion meter according to claim 1, characterized in that: The other end of the calibration liquid chamber housing (18) is sealed by a sealing end cover, and the drainage pipe (200) seals through the sealing end cover and communicates with the measuring water body sealed chamber (900).

5. The expansion calibration system of the borehole expansion meter according to claim 1, characterized in that: The expansion amount verification system of the borehole expansion meter also includes an electronic scale; The electronic scale is in communication connection with the signal input device (600); the electronic scale is used to weigh the measurement water flowing out of the measurement water sealed chamber (900) through the drainage pipe (200).

6. The expansion calibration system of a borehole expansion meter according to any one of claims 1 to 4, characterized in that: The expansion calibration system of the borehole expansion meter also includes: An electronic scale for weighing the measurement water flowing out of the measurement water sealed chamber (900) through the drainage pipe (200); The host computer is connected to the signal input device (600) for communication and is used to analyze the real-time detection data.

7. A calibration method for an expansion calibration system using the borehole expansion meter according to claim 6, characterized in that: The following steps are involved: S1, installing the expansion calibration system of the borehole expansion meter and filling the borehole expansion meter with pure water and completing the exhaust, and then executing S2; in step S1, before installing the calibration liquid chamber housing (18), first test whether the borehole expansion meter is faulty, and if the borehole expansion meter is not faulty, continue to complete S1; S2, controlling the hydraulic push rod (162) of the oil-sealed hydraulic push rod mechanism (16) through the first hydraulic pump (11) to compress the volume of the water containing chamber (17); then executing S3; S3, measuring the amount of water discharged from the drainage pipe (200), and setting the amount of water as the expansion amount of the borehole expansion meter; then executing S4; S4, dividing the test samples into multiple groups corresponding to different discharge water amounts according to the maximum expansion amount of the borehole expansion meter, and testing the samples one by one according to the different discharge water amounts, i.e., repeatedly executing S2 and S3 for multiple times, and then executing S5; before each repetition of S2, the borehole expansion meter needs to be refilled with pure water and vented; S5, respectively verifying the real-time detection signal of the signal input device (600) corresponding to the multiple groups of sample tests obtained in S4, the reading of the oil outlet pipe pressure gauge (12), the reading of the oil return pipe pressure gauge (800), and the amount of water discharged from the drain pipe (200) and weighed by the electronic scale.

8. The verification method according to claim 7, characterized in that: The verification method also includes the following steps: S6, determining the relationship between the real-time detection signal of the upper computer verification signal input device (600), the reading of the oil outlet pipe pressure gauge (12), the reading of the oil return pipe pressure gauge (800), and the amount of water discharged from the drain pipe (200) and measured by the electronic scale.

9. The verification method according to claim 7 or 8, characterized in that: In S5, the detection expansion amount V1 of the borehole expansion meter is obtained through the host computer; And obtain the relative error δ of the borehole expansion meter v ; Relative error of borehole expansion meter δ v The formula is: In formula (1), V2 is the amount of water discharged from the drain pipe (200) during the test.

10. The verification method according to claim 9, characterized in that: When the expansion amount V1 detected by the borehole expansion meter under the action of each level of pressure of the first hydraulic pump (11) is not greater than a threshold value, it is determined that the borehole expansion meter is in a normal state.

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