Rock stratum layering hydraulic connection measuring device and method

Abstract

The invention provides a rock stratum layering hydraulic connection measuring device and method, and relates to the technical field of rock stratum exploration, the rock stratum layering hydraulic connection measuring device comprises a first plunger, a measuring pipe, a second plunger and a water injection pipe, and under the condition that the first plunger, the measuring pipe, the second plunger and the water injection pipe are located in a drill hole and the first plunger and the second plunger are pressurized, the first plunger and the second plunger are located in the drill hole; a measuring cavity and a pressurizing cavity are defined in the drill hole; the first sensor is used for detecting the pressure in the measuring cavity; the second sensor is used for detecting the pressure in the pressurizing cavity; the processor is used for receiving detection signals of the first sensor and the second sensor and calculating a hydraulic connection value, and the hydraulic connection value is the ratio of the pressure increment in the measuring cavity to the pressure increment in the pressurizing cavity in the target time period. The technical problem that the hydraulic connection between the upper rock stratum and the lower rock stratum cannot be measured in an existing pressurized water test mode is solved, the permeability between the upper rock stratum and the lower rock stratum is evaluated, and a data basis can be provided for accurately calculating water pressure outside a tunnel.

Description

Technical Field

[0001] The invention relates to the technical field of rock stratum surveying, and in particular to a rock stratum layer hydraulic connection measuring device and method. Background Art

[0002] The permeability of rock mass is an important basis for calculating the external water pressure of the tunnel and designing anti-seepage measures. In engineering geological surveys, water pressure tests are usually carried out in sections from top to bottom during or after the drilling process. The water pressure test mainly isolates the borehole into a test section with a certain length through a single plug or a double plug, and measures the pressure and flow of the test section by pressurizing the test section with water, and then calculates the water permeability or permeability coefficient of each rock layer.

[0003] Although the conventional water pressure test method can reveal the permeability characteristics of each test section, it has limitations, that is, it cannot directly reflect the hydraulic connection between different rock layers, especially the hydraulic connection between the upper and lower rock layers. As a non-homogeneous and discontinuous medium, the difference in permeability between the upper and lower layers of the rock mass has an important influence on the comprehensive and accurate assessment of the external water pressure of the tunnel. However, the conventional water pressure test methods and equipment currently widely used cannot measure the key feature of the hydraulic connection between different rock layers. Summary of the invention

[0004] The purpose of the present invention is to provide a rock stratum hydraulic connection measurement device and method to solve the technical problem that the conventional water pressure test method in the prior art cannot measure the hydraulic connection between the upper and lower rock strata.

[0005] In a first aspect, the present invention provides a rock layer hydraulic connection measurement device, comprising:

[0006] A first plunger, a measuring tube, a second plunger and a water injection tube are connected in sequence, an end of the first plunger away from the measuring tube is used to connect a drill pipe, when the first plunger, the measuring tube, the second plunger and the water injection tube are located in the borehole and the first plunger and the second plunger are pressurized, the inner wall of the borehole, the first plunger, the measuring tube and the second plunger form a measuring cavity, and the inner wall of the borehole, the second plunger and the water injection tube form a pressurized cavity;

[0007] A first sensor is arranged outside the measuring tube and is used to detect the pressure in the measuring cavity;

[0008] A second sensor is arranged outside the water injection pipe and is used to detect the pressure in the pressurized chamber;

[0009] A plurality of connecting pipes, each of which is provided with a threading hole, one end of which extends to the inner wall of the connecting pipe, and the other end of which extends to the outer wall of the connecting pipe, and the first plunger and the drill pipe, the first plunger and the measuring pipe, and the second plunger and the water injection pipe are connected respectively through the connecting pipes;

[0010] a processor, respectively connected to the first sensor and the second sensor for receiving detection signals from the first sensor and the second sensor, and calculating a hydraulic connection value based on the detection signals from the first sensor and the second sensor, wherein the hydraulic connection value is a ratio of an increment of pressure in the measuring chamber to an increment of pressure in the pressurizing chamber within a target time period;

[0011] a first signal line, the first signal line having a first end, a second end and a first connecting section between the first end and the second end, the first end being passed through a threading hole of a connecting pipe between the first plunger and the drill pipe, the first end being connected to a processor, the second end being passed through a threading hole of a connecting pipe between the first plunger and the measuring pipe, the second end being connected to a first sensor, the first connecting section being located in the first plunger and in the connecting pipes at both ends of the plunger;

[0012] The second signal line has a third end, a fourth end and a second connecting section located between the third end and the fourth end, the third end is passed through the threading hole of the connecting pipe between the first plunger and the drill pipe, the third end is connected to the processor, the fourth end is passed through the threading hole of the connecting pipe between the second plunger and the water injection pipe, the fourth end is connected to the second sensor, and the second connecting section is located in the first plunger, the measuring tube, the second plunger and multiple connecting pipes.

[0013] In an optional embodiment, at the threading hole position, the first end, the second end, the third end and the fourth end are interference fit with the connecting pipe to form a seal, or an adhesive seal.

[0014] In an optional embodiment, one end of the connecting pipe is provided with an internal thread, and the other end of the connecting pipe is provided with an external thread. The connecting pipe is threadedly connected to the first plunger, drill rod, measuring tube, second plunger or water injection pipe through the internal thread or external thread.

[0015] In an optional embodiment, it also includes:

[0016] A first pressure device, connected to the water inlet of the first plunger and the second plunger, for adjusting the pressure of the first plunger and the second plunger;

[0017] The second pressure device is connected to the drill pipe and is used to supply water to the pressurized chamber and adjust the pressure in the pressurized chamber.

[0018] In an optional embodiment, it also includes:

[0019] The first pressure device and / or the second pressure device is a water pump of a drive pipe of the drill rod.

[0020] In a second aspect, the present invention further provides a method for measuring hydraulic connection of rock strata, using the above rock strata hydraulic connection measuring device, comprising:

[0021] S1, sequentially connect the first plunger, the measuring tube, the second plunger and the water injection pipe of the stratum hydraulic connection measuring device, and install the first sensor and the second sensor;

[0022] S2, connecting the first plunger of the rock layer hydraulic connection measurement device to the drill pipe;

[0023] S3, inserting the rock stratum stratum hydraulic communication measuring device into the borehole, so that the rock stratum stratum hydraulic communication measuring device reaches the target position;

[0024] S4, pressurizing the first plunger and the second plunger, so that the inner wall of the borehole, the first plunger, the measuring tube and the second plunger form a measuring cavity, and the inner wall of the borehole, the second plunger and the water injection tube form a pressurizing cavity;

[0025] S5, pressurizing the pressurized chamber through the drill pipe;

[0026] S6, detecting the pressure in the measuring chamber by the first sensor, and detecting the pressure in the pressurizing chamber by the second sensor;

[0027] S7. The processor receives detection signals from the first sensor and the second sensor, and calculates a hydraulic connection value based on the detection signals from the first sensor and the second sensor, wherein the hydraulic connection value is a ratio of an increment of pressure in the measuring chamber to an increment of pressure in the pressurizing chamber within a target time period, and a calculation formula for the hydraulic connection value is:

[0028]

[0029] Among them, H is the hydraulic connection value, P b-1 is the pressure of the pressurized chamber during the first period of time, P b-3 is the pressure of the pressurized chamber during the third time period, P m-1 is the pressure of the measuring chamber during the first period of time, P m-3 The pressure of the cavity is measured during a third time period.

[0030] In an optional embodiment, after the processor receives the detection signals of the first sensor and the second sensor and calculates the hydraulic connection value based on the detection signals of the first sensor and the second sensor, the method further includes:

[0031] S8, stop pressurizing the pressurizing chamber, and stop pressurizing the first plunger and the second plunger;

[0032] S9, moving the rock stratum hydraulic connection measuring device to the next target position;

[0033] S10, repeat steps S4 to S7 until the measurement of all target positions is completed.

[0034] In an optional embodiment, the levels of hydraulic connection include weak connection, medium connection and strong connection, and the rules for setting the level division of hydraulic connection include:

[0035] It is assumed that when H < 0.01, the hydraulic connection is weak, when 0.01 ≤ H ≤ 0.1, the hydraulic connection is medium, and when H > 0.1, the hydraulic connection is strong.

[0036] In an optional embodiment, after the processor receives the detection signals of the first sensor and the second sensor and calculates the hydraulic connection value based on the detection signals of the first sensor and the second sensor, the method further includes:

[0037] S71. Set a hydraulic connection grade classification rule, and determine the hydraulic connection grade based on the grade classification rule and the calculated hydraulic connection value.

[0038] In an optional embodiment, pressurizing the pressurized chamber through the drill pipe includes:

[0039] applying a first pressure to the pressurized chamber during a first time period;

[0040] applying a second pressure to the pressurized chamber during a second time period;

[0041] applying a third pressure to the pressurized chamber during a third time period;

[0042] applying a second pressure to the pressurized chamber during a fourth time period;

[0043] applying a first pressure to the pressurized chamber during a fifth time period;

[0044] Wherein, the first pressure is less than the second pressure, and the second pressure is less than the third pressure;

[0045] The target time period includes a second time period and a third time period.

[0046] The rock strata hydraulic connection measurement device and method provided by the present invention form a mutually isolated measuring chamber and a pressurizing chamber when the first plunger and the second plunger are pressurized. At this time, the pressurizing chamber is pressurized by the drill pipe, and the pressure in the measuring chamber is measured by the first sensor, and the pressure in the pressurizing chamber is measured by the second sensor. The processor receives the detection signals of the first sensor and the second sensor, and calculates the hydraulic connection value based on the detection signals of the first sensor and the second sensor. This solves the technical problem that the conventional water pressure test method in the prior art cannot realize the measurement of the hydraulic connection between different rock layers, realizes the evaluation of the permeability between the upper and lower rock masses, and can provide a data basis for accurately calculating the water pressure outside the tunnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0048] Figure 1 A schematic diagram of the structure of a rock stratum hydraulic connection measurement device provided by an embodiment of the present invention;

[0049] Figure 2 A diagram showing a use scenario of the rock stratum hydraulic connection measurement device provided in an embodiment of the present invention;

[0050] Figure 3 A schematic diagram of the structure of a connecting pipe in a rock stratum hydraulic connection measurement device provided by an embodiment of the present invention;

[0051] Figure 4 One of the flow charts of the method for measuring hydraulic connection of rock strata provided in an embodiment of the present invention;

[0052] Figure 5 A schematic diagram of a pressure curve for a method for measuring hydraulic connection of rock strata provided in an embodiment of the present invention;

[0053] Figure 6 The second flowchart of the method for measuring the hydraulic connection of rock strata provided in the embodiment of the present invention.

[0054] Icon: 100-drill rod; 200-connecting pipe; 210-internal thread; 220-external thread; 230-threading hole; 300-first plunger; 400-measuring tube; 410-first sensor; 420-first signal line; 430-measuring chamber; 500-second plunger; 600-water injection pipe; 610-second sensor; 620-second signal line; 630-pressurization chamber; 700-drilling hole. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0056] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0057] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0058] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0059] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0060] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] The rock strata hydraulic connection measurement device provided in this embodiment can be installed on a drill pipe, so as to measure the hydraulic connection that may exist between different rock strata (usually between upper and lower rock masses) in a borehole.

[0062] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0063] Combination Figure 1 and Figure 2 A rock formation layer hydraulic communication measurement device provided in this embodiment includes a first plunger 300, a measuring tube 400, a second plunger 500 and a water injection pipe 600 which are connected in sequence. The end of the first plunger 300 away from the measuring tube 400 is used to connect the drill pipe 100. When the first plunger 300, the measuring tube 400, the second plunger 500 and the water injection pipe 600 are located in a borehole 700 and the first plunger 300 and the second plunger 500 are pressurized, the inner wall of the borehole 700, the first plunger 300, the measuring tube 400 and the second plunger 500 form a measuring cavity 430, and the inner wall of the borehole 700, the second plunger 500 and the water injection pipe 600 form a pressurized cavity 630.

[0064] It should be noted that when the first plunger 300 and the second plunger 500 are not pressurized, the first plunger 300 and the second plunger 500 are not in contact with the inner wall of the borehole 700, or the first plunger 300 and the second plunger 500 are in contact with the inner wall of the borehole 700 but do not start the plugging effect in the borehole 700. At this time, the rock layer hydraulic communication measuring device can be driven to rise and fall by the drill rod 100 to adjust the position. When the first plunger 300 and the second plunger 500 are pressurized, the first plunger 300 and the second plunger 500 expand, and the first plunger 300 and the second plunger 500 fit the inner wall of the borehole 700 to form a plug. At this time, the inner wall of the borehole 700, the first plunger 300, the measuring tube 400 and the second plunger 500 surround the measuring cavity 430, and the inner wall of the borehole 700, the second plunger 500 and the water injection pipe 600 surround the pressurized cavity 630. The pressurized chamber 630 is connected to the drill pipe 100 through the first plunger 300, the measuring tube 400, the second plunger 500 and the water injection pipe 600, and the pressurized chamber 630 can be pressurized through the drill pipe; the measuring chamber 430 is a closed chamber, and the water in the pressurized chamber 630 cannot enter the measuring chamber 430 through the components in the rock layer hydraulic communication measurement device.

[0065] The present embodiment provides a rock formation layer hydraulic connection measurement device further including a first sensor 410, a second sensor 610 and a processor. The first sensor 410 is arranged outside the measuring tube 400, and is used to detect the pressure in the measuring cavity 430. The second sensor 610 is arranged outside the water injection tube 600, and is used to detect the pressure in the pressurizing cavity 630. The processor is respectively connected to the first sensor 410 and the second sensor 610 for communication, and is used to receive the detection signals of the first sensor 410 and the second sensor 610, and calculate the hydraulic connection value based on the detection signals of the first sensor 410 and the second sensor 610, wherein the hydraulic connection value is the ratio of the increment of the pressure in the measuring cavity 430 to the increment of the pressure in the pressurizing cavity 630 in the target time period.

[0066] In this embodiment, when there is permeability between rock formations, water in the pressurization chamber 630 can enter the measuring chamber 430 through the rock formation, and the pressure increment ratio of the pressurization chamber 630 and the measuring chamber 430 changes. By measuring the change in the pressure increment ratio of the pressurization chamber 630 and the measuring chamber 430, the permeability between the upper and lower rock masses can be evaluated. The method provided by the present invention can provide a data basis for accurately calculating the water pressure outside the tunnel.

[0067] The stratum hydraulic communication measuring device further includes a plurality of connecting pipes 200 , and the first plunger 300 and the drill pipe 100 , the first plunger 300 and the measuring pipe 400 , and the second plunger 500 and the water injection pipe 600 are respectively connected via a connecting pipe 200 .

[0068] Combination Figure 3 In some embodiments, the connecting tube 200 is provided with a threading hole 230, one end of the threading hole 230 extends to the inner wall of the connecting tube 200, and the other end extends to the outer wall of the connecting tube 200; the measuring device also includes a first signal line 420 and a second signal line 620, the first signal line 420 has a first end, a second end and a first connecting section located between the first end and the second end, the first end is passed through the threading hole 230 of the connecting tube 200 located between the first plunger 300 and the drill rod 100, the first end is connected to the processor, the second end is passed through the threading hole 230 of the connecting tube 200 located between the first plunger 300 and the measuring tube 400, the second end is connected to the first sensor 410, and the first connecting section is located in the first plunger 300 and the connecting tube 200 located at both ends of the plunger. The second signal line 620 has a third end, a fourth end and a second connecting section located between the third end and the fourth end, the third end is passed through the threading hole 230 of the connecting pipe 200 located between the first plunger 300 and the drill rod 100, the third end is connected to the processor, the fourth end is passed through the threading hole 230 of the connecting pipe 200 located between the second plunger 500 and the water injection pipe 600, the fourth end is connected to the second sensor 610, and the second connecting section is located in the first plunger 300, the measuring tube 400, the second plunger 500 and multiple connecting pipes 200.

[0069] Since the first plunger 300 and the second plunger 500 are squeezed and sealed with the inner wall of the borehole 700 when the first plunger 300 and the second plunger 500 are pressurized, the first signal line 420 and the second signal line 620 are arranged outside, which not only easily causes the signal line to be squeezed and damaged by the first plunger 300 and the second plunger 500, but also destroys the sealing of the first signal line 420 and the second signal line 620, affecting the measurement result. However, in this embodiment, through the above-mentioned arrangement, the first signal line 420 and the second signal line 620 can pass through the first plunger 300 and the second plunger 500 from the inside, thereby protecting the first signal line 420 and the second signal line 620 and preventing the first signal line 420 and the second signal line 620 from destroying the sealing effect, which is conducive to improving the accuracy of the measurement.

[0070] Optionally, at the position of the threading hole 230, the first end, the second end, the third end and the fourth end are interference-fitted with the connecting tube 200 to form a seal, or the first end, the second end, the third end and the fourth end are bonded and sealed with the connecting tube 200. Of course, the first end, the second end, the third end and the fourth end can also be sealed with the connecting tube 200 by adding a sealing member, etc. This can prevent water seepage between the inner side and the outer side of the connecting tube 200, which affects the detection effect.

[0071] Preferably, one end of the connecting pipe 200 is provided with an internal thread 210, and the other end of the connecting pipe 200 is provided with an external thread 220, and the connecting pipe 200 is threadedly connected with the first plunger 300, the drill rod 100, the measuring tube 400, the second plunger 500 or the water injection pipe 600 through the internal thread 210 or the external thread 220. For example, one end of the connecting pipe 200 having the external thread 220 is threadedly matched with the internal thread 210 of the drill rod 100 to achieve a detachable connection between the connecting pipe 200 and the drill rod 100, and one end of the connecting pipe 200 having the internal thread 210 is matched with the external thread 220 of the first plunger 300 to achieve a detachable connection between the connecting pipe 200 and the drill rod 100.

[0072] Through the threaded connection, on the one hand, a detachable connection between adjacent components is achieved, and on the other hand, the reliability of the connection is guaranteed, the structural strength is improved, and water leakage is prevented from affecting the measurement results.

[0073] In an optional embodiment, the rock layer hydraulic communication measurement device further includes a first pressure device and a second pressure device, wherein the first pressure device is connected to the water inlet of the first plunger 300 and the second plunger 500, and is used to adjust the pressure of the first plunger 300 and the second plunger 500. The second pressure device is connected to the drill pipe 100, and is used to supply water to the pressurized chamber 630 and adjust the pressure in the pressurized chamber 630.

[0074] In this embodiment, both the first pressure device and the second pressure device can be water pumps, and both the first pressure device and the second pressure device can be the original pressure supply water pumps of the drive pipe of the drill pipe 100. In addition, the first pressure device and the second pressure device can use the same water pump, and respectively realize the pressure regulation of the first plunger 300 and the second plunger 500 and the pressure regulation in the pressurizing chamber 630 through the pipeline structure such as the control valve.

[0075] Optionally, the first pressure device is connected to the first plunger 300 by a pipeline, and the first plunger 300 is connected to the second plunger 500 by a pipeline, so as to prevent the pressure supply pipeline of the second plunger 500 from being squeezed and damaged by the first plunger 300 and the inner wall of the borehole 700, or the pressure supply pipeline of the second plunger 500 from affecting the sealing effect of the position of the first plunger 300.

[0076] Optionally, the control systems of the first pressure device and the second pressure device are communicatively connected to the first sensor 410 and the second sensor 610, for example, through the first signal line 420 and the second signal line 620, and the control systems of the first pressure device and the second pressure device adjust the pressures in the first plunger 300, the second plunger 500 and the pressurizing chamber 630 according to the detection signals of the first sensor 410 and the second sensor 610.

[0077] Combination Figure 4 and Figure 5 The embodiment of the present invention further provides a method for measuring hydraulic connection between rock layers, which uses the rock layer hydraulic connection measuring device of the above embodiment, and the method comprises:

[0078] S1. The first plunger 300, the measuring tube 400, the second plunger 500 and the water injection tube 600 of the stratum layer hydraulic communication measuring device are connected in sequence, and the first sensor 410 and the second sensor 610 are installed.

[0079] S2. Connect the first plunger 300 of the rock formation layer hydraulic communication measurement device to the drill pipe 100.

[0080] S3. Insert the stratum stratum hydraulic connection measurement device into the borehole 700, so that the stratum stratum hydraulic connection measurement device reaches the target position. The process of inserting the stratum stratum hydraulic connection measurement device into the borehole 700 can be achieved by driving a drilling rig. In this embodiment, when the stratum stratum hydraulic connection measurement device reaches the target position, the stratum stratum hydraulic connection measurement of the target position can be achieved. When the borehole 700 includes multiple positions to be measured, multiple target positions can be set to be measured in sequence according to a preset order, for example, from top to bottom, or from bottom to top.

[0081] S4. Pressurize the first plunger 300 and the second plunger 500 so that the inner wall of the borehole 700, the first plunger 300, the measuring tube 400 and the second plunger 500 form a measuring cavity 430, and the inner wall of the borehole 700, the second plunger 500 and the water injection tube 600 form a pressurized cavity 630.

[0082] S5. Pressurize the pressurizing chamber 630 through the drill rod 100.

[0083] Optionally, pressurizing the pressurizing chamber 630 through the drill pipe 100 includes: applying a first pressure to the pressurizing chamber 630 in a first time period; applying a second pressure to the pressurizing chamber 630 in a second time period; applying a third pressure to the pressurizing chamber 630 in a third time period; applying a second pressure to the pressurizing chamber 630 in a fourth time period; applying a first pressure to the pressurizing chamber 630 in a fifth time period; wherein the first pressure is less than the second pressure, and the second pressure is less than the third pressure; wherein the target time period includes the second time period and the third time period. This pressurization method is a three-stage pressurization including five stages, and the pressurization sequence is P1-P2-P3-P4 (equal to P2)-P5 (equal to P1), wherein P1 is the first pressure, P2 is the second pressure, and P3 is the third pressure, wherein the first time period, the second time period, the third time period, the fourth time period, and the fifth time period are equal in duration, for example, all are 5 minutes.

[0084] S6. Detect the pressure in the measuring chamber 430 through the first sensor 410 , and detect the pressure in the pressurizing chamber 630 through the second sensor 610 .

[0085] S7. The processor receives detection signals from the first sensor 410 and the second sensor 610, and calculates a hydraulic connection value based on the detection signals from the first sensor 410 and the second sensor 610, wherein the hydraulic connection value is a ratio of an increase in pressure in the measuring chamber 430 to an increase in pressure in the pressurizing chamber 630 during a target time period.

[0086] Specifically, the calculation formula of the hydraulic connection value is:

[0087]

[0088] Among them, H is the hydraulic connection value, P b-1 is the pressure of the pressurized chamber 630 during the first period of time, P b-3 The pressure of the pressurized chamber 630 during the third time period, P m-1 is the pressure of the measuring chamber 430 during the first time period, P m-3 The pressure of the chamber 430 is measured during the third time period.

[0089] Combination Figure 5Optionally, after the processor receives the detection signals of the first sensor 410 and the second sensor 610 and calculates the hydraulic connection value based on the detection signals of the first sensor 410 and the second sensor 610, the method further includes:

[0090] S8, stop pressurizing the pressurizing chamber 630, and stop pressurizing the first plunger 300 and the second plunger 500;

[0091] S9, moving the rock stratum hydraulic connection measuring device to the next target position;

[0092] S10, repeat steps S4 to S7 until the measurement of all target positions is completed.

[0093] Combination Figure 6 Optionally, after the processor receives the detection signals of the first sensor 410 and the second sensor 610 and calculates the hydraulic connection value based on the detection signals of the first sensor 410 and the second sensor 610, the method further includes:

[0094] S71. Set a hydraulic connection grade classification rule, and determine the hydraulic connection grade based on the grade classification rule and the calculated hydraulic connection value.

[0095] For example, it is assumed that when H < 0.01, the hydraulic connection size is weak, when 0.01 ≤ H ≤ 0.1, the hydraulic connection is medium, and when H > 0.1, the hydraulic connection is strong.

[0096] For example, when the calculated hydraulic connection value is 0.05, the level of the hydraulic connection is determined to be a medium connection.

[0097] By classifying the hydraulic connection levels, the hydraulic connection strength of rock layers can be more intuitively characterized.

[0098] The rock strata hydraulic connection measurement device and method provided by the present invention solve the technical problem that the conventional water pressure test method in the prior art cannot measure the hydraulic connection between different rock strata, realizes the evaluation of the permeability between the upper and lower rock masses, and provides a data basis for accurately calculating the water pressure outside the tunnel.

[0099] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A rock stratum hydraulic connection measurement device, characterized in that: include: A first plunger, a measuring tube, a second plunger and a water injection tube connected in sequence, wherein the end of the first plunger facing away from the measuring tube is used to connect a drill pipe, and when the first plunger, the measuring tube, the second plunger and the water injection tube are located in a borehole and the first plunger and the second plunger are pressurized, the inner wall of the borehole, the first plunger, the measuring tube and the second plunger form a measuring cavity, and the inner wall of the borehole, the second plunger and the water injection tube form a pressurized cavity; A first sensor, disposed outside the measuring tube, for detecting the pressure in the measuring cavity; a second sensor, disposed outside the water injection pipe, for detecting the pressure in the pressurized chamber; A plurality of connecting pipes, each of which is provided with a threading hole, one end of which extends to the inner wall of the connecting pipe, and the other end of which extends to the outer wall of the connecting pipe, and the first plunger and the drill pipe, the first plunger and the measuring pipe, and the second plunger and the water injection pipe are connected respectively through the connecting pipes; a processor, respectively connected to the first sensor and the second sensor for receiving detection signals from the first sensor and the second sensor, and calculating a hydraulic connection value based on the detection signals from the first sensor and the second sensor, wherein the hydraulic connection value is a ratio of an increment of pressure in the measuring chamber to an increment of pressure in the pressurizing chamber within a target time period; a first signal line, the first signal line having a first end, a second end and a first connecting section between the first end and the second end, the first end being passed through the threading hole of the connecting tube between the first plunger and the drill pipe, the first end being connected to the processor, the second end being passed through the threading hole of the connecting tube between the first plunger and the measuring tube, the second end being connected to the first sensor, and the first connecting section being located in the first plunger and the connecting tubes located at both ends of the plunger; A second signal line, the second signal line has a third end, a fourth end and a second connecting section located between the third end and the fourth end, the third end is passed through the threading hole of the connecting pipe located between the first plunger and the drill pipe, the third end is connected to the processor, the fourth end is passed through the threading hole of the connecting pipe located between the second plunger and the water injection pipe, the fourth end is connected to the second sensor, and the second connecting section is located in the first plunger, the measuring tube, the second plunger and multiple connecting pipes.

2. The rock stratum hydraulic connection measuring device according to claim 1 is characterized in that: At the threading hole position, the first end, the second end, the third end and the fourth end are interference-fitted with the connecting pipe to form a seal, or an adhesive seal.

3. The rock stratum hydraulic connection measuring device according to claim 1 is characterized in that: One end of the connecting pipe is provided with an internal thread, and the other end of the connecting pipe is provided with an external thread. The connecting pipe is threadedly connected to the first plunger, the drill rod, the measuring pipe, the second plunger or the water injection pipe through the internal thread or the external thread.

4. The rock stratum hydraulic connection measuring device according to any one of claims 1 to 3, characterized in that: Also includes: a first pressure device, connected to the water inlet of the first plunger and the second plunger, for adjusting the pressure of the first plunger and the second plunger; The second pressure device is connected to the drill pipe and is used to supply water to the pressurizing chamber and adjust the pressure in the pressurizing chamber.

5. The device for measuring hydraulic connection of rock layers according to claim 4, characterized in that: The first pressure device and / or the second pressure device is a water pump of a driving pipe of the drill pipe.

6. A method for measuring hydraulic connection of rock strata, using the rock strata hydraulic connection measuring device according to any one of claims 1 to 5, characterized in that: include: S1, sequentially connect the first plunger, the measuring tube, the second plunger and the water injection pipe of the stratum hydraulic connection measuring device, and install the first sensor and the second sensor; S2, connecting the first plunger of the rock layer hydraulic connection measurement device to the drill pipe; S3, inserting the rock stratum stratum hydraulic communication measuring device into the borehole, so that the rock stratum stratum hydraulic communication measuring device reaches the target position; S4, applying pressure to the first plunger and the second plunger, so that the inner wall of the borehole, the first plunger, the measuring tube and the second plunger form a measuring cavity, and the inner wall of the borehole, the second plunger and the water injection tube form a pressurizing cavity; S5, pressurizing the pressurizing chamber through the drill rod; S6. Detecting the pressure in the measuring chamber by the first sensor, and detecting the pressure in the pressurizing chamber by the second sensor; S7. The processor receives the detection signals of the first sensor and the second sensor, and calculates a hydraulic connection value based on the detection signals of the first sensor and the second sensor, wherein the hydraulic connection value is a ratio of an increment of the pressure in the measuring chamber to an increment of the pressure in the pressurizing chamber within a target time period, and a calculation formula for the hydraulic connection value is: Among them, H is the hydraulic connection value, P b-1 is the pressure of the pressurized chamber during the first period of time, P b-3 is the pressure of the pressurized chamber during the third time period, P m-1 is the pressure of the measuring chamber during the first period of time, P m-3 The pressure of the cavity is measured during a third time period.

7. The measuring method according to claim 6, characterized in that: After the processor receives the detection signals of the first sensor and the second sensor, and calculates the hydraulic connection value based on the detection signals of the first sensor and the second sensor, the method further includes: S8, stop pressurizing the pressurizing chamber, and stop pressurizing the first plunger and the second plunger; S9, moving the rock stratum hydraulic connection measuring device to the next target position; S10, repeat steps S4 to S7 until the measurement of all target positions is completed.

8. The measuring method according to claim 6 or 7, characterized in that: After the processor receives the detection signals of the first sensor and the second sensor, and calculates the hydraulic connection value based on the detection signals of the first sensor and the second sensor, the method further includes: S71. Set a hydraulic connection grade classification rule, and determine the hydraulic connection grade based on the grade classification rule and the calculated hydraulic connection value.

9. The measuring method according to claim 8, characterized in that: The levels of hydraulic connection include weak connection, medium connection and strong connection, and the rules for setting the level of hydraulic connection include: It is assumed that when H < 0.01, the hydraulic connection is weak, when 0.01 ≤ H ≤ 0.1, the hydraulic connection is medium, and when H > 0.1, the hydraulic connection is strong.

10. The measuring method according to claim 6, characterized in that: The pressurizing the pressurizing chamber through the drill rod comprises: applying a first pressure to the pressurized chamber during a first time period; applying a second pressure to the pressurized chamber during a second time period; applying a third pressure to the pressurized chamber during a third time period; applying a second pressure to the pressurized chamber during a fourth time period; applying a first pressure to the pressurized chamber during a fifth time period; Wherein, the first pressure is lower than the second pressure, and the second pressure is lower than the third pressure; The target time period includes the second time period and the third time period.

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