Ground stress testing device

Abstract

The present invention discloses a ground stress testing device, which includes an expansion sealing assembly and a high-pressure water pipe. The expansion sealing assembly includes a first expansion section, a second expansion section, and an adapter arranged in sequence along its length. The first expansion section and the second expansion section are respectively sealed and connected to both sides of the adapter, and at least one of the first expansion section and the second expansion section is movably connected to the adapter. The high-pressure water pipe extends into the expansion sealing assembly along the first expansion section, and the water outlet of the high-pressure water pipe is connected to the impact channel in the adapter, and the water outlet of the impact channel faces the hole wall. The expansion section of the ground stress testing device of the present invention can move freely relative to the adapter during the expansion process, thereby ensuring that the adapter provided between the expansion sections is not damaged by tearing due to external force, ensuring that the test work can be carried out normally, and the high-pressure water pipe provided in the first expansion section can be bent and deformed to a certain extent, ensuring that the device can be smoothly removed and has good applicability.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mining, and in particular to a ground stress testing device. Background Art

[0002] Geostress is the natural stress that exists in the strata without being disturbed by engineering. In coal mining, the existence of high geostress can cause geological disasters such as roof collapse, rock burst or gas outburst. Therefore, mines need to carry out geostress testing to clarify the magnitude and direction of geostress, optimize the layout of the coal mining face according to the test results, and ensure the safety of the coal mining face.

[0003] At present, there are many methods for testing geostress, including direct testing methods such as hydraulic fracturing, acoustic emission, and borehole collapse, and indirect testing methods such as casing stress relief and strain recovery. Among them, the hydraulic fracturing method uses a testing device to conduct in-situ testing in the rock mass. This method first sets upper and lower packers in series at the test depth of the test hole. The upper and lower packers then expand and abut against the hole wall, thereby forming a closed fracturing section between the upper and lower packers. Afterwards, high-pressure liquid is introduced into the closed fracturing section through the central pipe connecting the upper and lower packers to pressurize the closed fracturing section, thereby forming a tension crack in the wall of the test hole. The pressure change data of the closed fracturing section is collected to obtain the geostress state in the test rock mass.

[0004] In the related art, the upper and lower packers cannot be pressurized synchronously, resulting in the staggered expansion of the two. As a result, the forces at both ends of the central pipe in the closed fracturing section are unbalanced, and the liquid outlet of the central pipe is easily torn and broken, which in turn causes damage to the ground stress testing device, affecting the normal progress of the ground stress testing work. In addition, since the test hole cannot ensure completely straight construction, during the high-pressure expansion process of the upper and lower packers, the central pipe is also prone to permanent deformation due to the bending of the hole wall, resulting in the ground stress testing device being unable to be smoothly removed from the test hole after the test is completed, and its applicability is poor. Summary of the Invention

[0005] The present invention aims to solve, at least to a certain extent, one of the technical problems in the related art. To this end, an embodiment of the present invention provides a ground stress testing device, wherein the first expansion section or the second expansion section of the ground stress testing device can move freely relative to the adapter during the expansion process, thereby ensuring that the adapter disposed between the first expansion section and the second expansion section is not damaged by external tearing force, and the impact channel in the adapter can discharge liquid and apply pressure normally, thereby reducing the failure rate of the ground stress testing device and ensuring that the ground stress test can proceed normally.

[0006] In addition, in the ground stress testing device of the present application, the high-pressure water pipe arranged in the first expansion section can be made of flexible material, so that the high-pressure water pipe can bend and deform as the first expansion section expands, and can return to its original shape after the pressure in the first expansion section is relieved, thereby ensuring that the expansion sealing assembly can be smoothly removed from the test hole after the test is completed, thereby improving the applicability of the present device.

[0007] The ground stress testing device of an embodiment of the present invention includes an expansion sealing assembly and a high-pressure water pipe, the expansion sealing assembly includes a first expansion section, a second expansion section and an adapter arranged in sequence along its length direction, the first expansion section and the second expansion section are respectively sealed and connected to both sides of the adapter, and at least one of the first expansion section and the second expansion section is movably connected to the adapter, the high-pressure water pipe extends into the expansion sealing assembly along the first expansion section, and the water outlet of the high-pressure water pipe is located in the adapter, the adapter is provided with an impact channel, one end of the impact channel is connected to the water outlet of the high-pressure water pipe, and the other end of the impact channel is open toward the hole wall.

[0008] According to the geostress testing device of an embodiment of the present invention, the first expansion section and the second expansion section of the expansion sealing assembly are movably connected to both sides of the adapter while ensuring sealing performance. The high-pressure water pipe extends into the expansion sealing assembly along the first expansion section, and the water outlet of the high-pressure water pipe is connected to the impact channel in the adapter, and the water outlet of the impact channel faces the hole wall. Therefore, when the geostress testing device of the present application is used for geostress testing, the expansion sealing assembly can be installed as an integral component to a certain test depth of the test hole, the first expansion section can be used as an upper packer, and the second expansion section can be used as a lower packer. The two expand and abut against the wall of the test hole to fix the expansion sealing assembly, and at the same time, a closed fracturing section is formed between the two. At this time, the adapter The impact channel in the connector can discharge the liquid in the high-pressure water pipe into the closed fracturing section, thereby pressurizing the closed fracturing section. The ground stress test can be completed by collecting the pressure change data of the closed fracturing section during the pressurization process. Compared with traditional technologies, the first expansion section or the second expansion section of the ground stress testing device of the present application has a certain axial activity space relative to the adapter. When the first expansion section or the second expansion section is shortened due to the expansion effect, the ends of the two can move freely so as not to cause tearing damage to the connection between the adapter and the expansion section. The impact channel in the adapter can discharge liquid normally, thereby reducing the failure rate of the ground stress testing device, improving the applicability of the ground stress testing device, and ensuring that the ground stress test can be carried out normally.

[0009] In addition, in the ground stress testing device of the present application, the high-pressure water pipe arranged in the first expansion section can be made of flexible material, so that the high-pressure water pipe can bend and deform as the first expansion section expands, and can return to its original shape after the pressure in the first expansion section is relieved, thereby ensuring that the expansion sealing assembly can be smoothly removed from the test hole after the test is completed, thereby improving the applicability of the present device.

[0010] In some embodiments, the ground stress testing device further includes a liquid supply pipeline, the first expansion section has a first expansion cavity, the second expansion section has a second expansion cavity, and the liquid supply pipeline is connected to both the first expansion cavity and the second expansion cavity.

[0011] In some embodiments, the adapter has a communication channel, and the communication channel can connect the first expansion chamber and the second expansion chamber, and the liquid supply pipe is connected to the first expansion chamber.

[0012] In some embodiments, the first expansion section has a liquid inlet at one end away from the adapter, and the liquid supply pipe is connected to the liquid inlet and is arranged along the length direction of the high-pressure water pipe.

[0013] In some embodiments, the water inlet of the high-pressure water pipe is fitted into the liquid supply pipe, and the portion of the high-pressure water pipe located within the liquid supply pipe is spaced apart from the inner circumference of the liquid supply pipe.

[0014] In some embodiments, a plurality of fixed bridges are provided on the outer circumference of the high-pressure water pipe and are spaced apart along the circumference of the high-pressure water pipe. The fixed bridges are connected between the outer circumference of the high-pressure water pipe and the inner circumference of the liquid supply pipe.

[0015] In some embodiments, the second expansion chamber has a liquid outlet at one end away from the adapter, and an air induction valve is provided at the liquid outlet.

[0016] In some embodiments, the liquid supply pipe is made of hard material.

[0017] In some embodiments, the impact channel includes a straight section and a side straight section, the straight section extends along the length direction of the high-pressure water pipe, the side straight section extends along the radial direction of the high-pressure water pipe and is open toward the hole wall, the liquid outlet end of the high-pressure water pipe fits in the straight section, and a sealing structure is provided between the outer circumference of the high-pressure water pipe and the inner circumference of the straight section.

[0018] In some embodiments, a throttling constriction is provided at the connecting end of the straight section and the side straight section, and the end of the high-pressure water pipe located in the straight section is separated from the throttling constriction. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 12 is a schematic structural diagram of a ground stress testing device according to an embodiment of the present invention.

[0020] Figure 2 3 is a schematic structural diagram of an expansion sealing assembly in a normal state of a ground stress testing device according to an embodiment of the present invention.

[0021] Figure 3 3 is a schematic structural diagram of an expansion sealing assembly in a working state of a ground stress testing device according to an embodiment of the present invention.

[0022] Figure 4 2 is a schematic structural diagram of a dual-channel pipeline of a ground stress testing device according to an embodiment of the present invention.

[0023] Figure 5 4 is a cross-sectional view of a dual-channel pipeline of a ground stress testing device according to an embodiment of the present invention.

[0024] Reference numerals:

[0025] Expansion sealing assembly 1, first expansion section 11, second expansion section 12, adapter 13, impact channel 14, straight section 141, side straight section 142, sealing structure 143, connecting flow channel 15, movable valve 16, air induction valve 17, high-pressure water pipe 2, liquid supply pipe 3, fixed bridge 4, pressure sensor 5. DETAILED DESCRIPTION

[0026] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0027] like Figure 1-Figure 5 As shown, the ground stress testing device according to the embodiment of the present invention includes an expansion sealing assembly 1 and a high-pressure water pipe 2.

[0028] Specifically, the expansion sealing assembly 1 includes a first expansion section 11, a second expansion section 12 and an adapter 13 arranged in sequence along its length direction. The first expansion section 11 and the second expansion section 12 are respectively sealed and connected on both sides of the adapter 13, and at least one of the first expansion section 11 and the second expansion section 12 is movably connected to the adapter 13. The high-pressure water pipe 2 extends into the expansion sealing assembly 1 along the first expansion section 11, and the water outlet of the high-pressure water pipe 2 is located in the adapter 13. The adapter 13 is provided with an impact channel 14, one end of the impact channel 14 is connected to the water outlet of the high-pressure water pipe 2, and the other end of the impact channel 14 is open toward the hole wall.

[0029] In other words, when using the geostress testing device of the present application to perform geostress testing, the expansion sealing assembly 1 can be installed as an integral component to a certain test depth of the test hole, the first expansion section 11 can serve as an upper packer, and the second expansion section 12 can serve as a lower packer. The two expand and abut against the wall of the test hole to fix the expansion sealing assembly 1, and at the same time, a closed fracturing section is formed between the two. At this time, the adapter 13 can discharge the high-pressure liquid in the high-pressure water pipe 2 to the closed fracturing section through the impact channel 14. As the amount of discharged liquid continues to increase, the pressure on the closed fracturing section continues to increase until the wall of the test hole cracks, thereby collecting the pressure change data of the closed fracturing section to complete the geostress testing work.

[0030] It is understandable that, in the ground stress testing device of the present application, while ensuring sealing, the first expansion section 11 or the second expansion section 12 is movably connected to the adapter 13, thereby, the first expansion section 11 or the second expansion section 12 has a certain axial movable space relative to the adapter 13. When the first expansion section 11 or the second expansion section 12 is shortened due to the expansion effect, the ends of the two can move freely without causing a tearing effect on the adapter 13, thereby avoiding damage to the adapter 13 structure, reducing the occurrence of failures, and ensuring that the device can work normally. Optionally, the first expansion section 11 or the second expansion section 12 can be interconnected with the connector through a movable valve 16 to ensure structural strength.

[0031] It should be noted that the pressure of the liquid in the high-pressure water pipe 2 is always consistent with the pressure borne by the closed fracturing section. Therefore, a pressure sensor 5 can be set at the input end of the high-pressure water pipe 2 to collect pressure data for rock stress analysis. In addition, a pressure sensor 5 can also be set at the input end of the liquid supply pipe 3 to observe whether the first expansion section 11 and the second expansion section 12 are expanded to their proper positions.

[0032] According to the geostress testing device of an embodiment of the present invention, the first expansion section and the second expansion section of the expansion sealing assembly are movably connected to both sides of the adapter while ensuring sealing performance. The high-pressure water pipe extends into the expansion sealing assembly along the first expansion section, and the water outlet of the high-pressure water pipe is connected to the impact channel in the adapter, and the water outlet of the impact channel faces the hole wall. Therefore, when the geostress testing device of the present application is used for geostress testing, the expansion sealing assembly can be installed as an integral component to a certain test depth of the test hole, the first expansion section can be used as an upper packer, and the second expansion section can be used as a lower packer. The two expand and abut against the wall of the test hole to fix the expansion sealing assembly, and at the same time, a closed fracturing section is formed between the two. At this time, the adapter The impact channel in the connector can discharge the liquid in the high-pressure water pipe into the closed fracturing section, thereby pressurizing the closed fracturing section. The ground stress test can be completed by collecting the pressure change data of the closed fracturing section during the pressurization process. Compared with traditional technologies, the first expansion section or the second expansion section of the ground stress testing device of the present application has a certain axial activity space relative to the adapter. When the first expansion section or the second expansion section is shortened due to the expansion effect, the ends of the two can move freely so as not to cause tearing damage to the connection between the adapter and the expansion section. The impact channel in the adapter can discharge liquid normally, thereby reducing the failure rate of the ground stress testing device, improving the applicability of the ground stress testing device, and ensuring that the ground stress test can be carried out normally.

[0033] In addition, in the ground stress testing device of the present application, the high-pressure water pipe arranged in the first expansion section can be made of flexible material, so that the high-pressure water pipe can bend and deform as the first expansion section expands, and can return to its original shape after the pressure in the first expansion section is relieved, thereby ensuring that the expansion sealing assembly can be smoothly removed from the test hole after the test is completed, thereby improving the applicability of the present device.

[0034] Furthermore, if Figure 1 、 Figure 4 and Figure 5 As shown, the ground stress testing device further includes a liquid supply pipe 3, the first expansion section 11 has a first expansion cavity, the second expansion section 12 has a second expansion cavity, and the liquid supply pipe 3 is connected to both the first expansion cavity and the second expansion cavity.

[0035] In other words, the first expansion section 11 and the second expansion section 12 can be hollow capsules made of elastic material. When the liquid supply pipe 3 introduces liquid into the hollow capsule, the first expansion section 11 and the second expansion section 12 will expand. As a result, the two will abut against the wall of the test hole through liquid expansion, thereby sealing the upper and lower ends of the adapter 13 to form a closed fracturing section.

[0036] Furthermore, if Figure 1-Figure 3 As shown, the adapter 13 has a communication channel 15, which can connect the first expansion chamber and the second expansion chamber, and the liquid supply pipe 3 is connected to the first expansion chamber.

[0037] It can be understood that the pressurized liquid flows from the liquid supply pipe 3 to the first expansion chamber, and then flows to the second expansion chamber through the communication channel 15, thereby achieving expansion of the second expansion section 12.

[0038] It should be noted that in traditional technology, the expansion chambers of the upper and lower seals are connected to each other by exposed soft water pipes, which are easy to be damaged or cause stuck holes, thereby affecting the normal progress of the ground stress test. In the present application, the connecting channel is arranged in the adapter 13, and there is no need to set up a separate flow channel to connect the first expansion chamber and the second expansion chamber, thereby reducing the space occupied by the expansion sealing assembly 1. As a result, the expansion sealing assembly 1 can be smoothly lowered to the test point, thereby improving the applicability of the device. In addition, the adapter 13 can be made of hard material, so as to protect the connecting flow channel 15 and ensure the smooth flow of the connecting flow channel 15.

[0039] It should be noted that the impact channel 14 of the adapter 13 and the communication channel 15 need to be separated by a certain distance to prevent the impact channel 14 from penetrating the communication channel 15 when inputting high-pressure liquid, thereby affecting the accuracy of the test data.

[0040] Furthermore, if Figure 1-Figure 5 As shown, the first expansion section 11 has a liquid inlet at one end away from the adapter 13 , and the liquid supply pipe 3 is connected to the liquid inlet and is arranged along the length direction of the high-pressure water pipe 2 .

[0041] In other words, the liquid supply pipe 3 is connected to the liquid inlet of the first expansion section 11, and the high-pressure water pipe 2 is connected to the liquid inlet of the adapter 13. The two can be arranged in parallel, thereby avoiding the liquid supply pipe 3 and the high-pressure water pipe 2 from being entangled with each other during the process of penetrating the test hole, thereby reducing the working efficiency of the ground stress test.

[0042] Furthermore, if Figure 1 、 Figure 4 and Figure 5 As shown, the water inlet of the high-pressure water pipe 2 is fitted into the liquid supply pipe 3, and the portion of the high-pressure water pipe 2 located inside the liquid supply pipe 3 is separated from the inner circumference of the liquid supply pipe 3. That is, at this time, the liquid supply pipe 3 and the high-pressure water pipe 2 form a dual-channel structure of an outer pipe sleeved with an inner pipe. While improving the utilization rate of the drilling space, the "outer pipe" serving as the liquid supply pipe 3 can also protect the "inner pipe" serving as the high-pressure water pipe 2, thereby preventing the high-pressure water pipe 2 from being damaged by collision during installation in the test hole.

[0043] Optionally, the high-pressure water pipe 2 includes an inner section provided in the first expansion section 11 and an outer section provided in the liquid supply pipe 3. The inner section and the outer section are detachably connected, thereby facilitating the assembly of the ground stress testing device. In addition, the inner section is movably connected to the first expansion section 11, so that when the first expansion section 11 contracts due to expansion, the inner section has space for movement, and the high-pressure water pipe 2 will not bend or become blocked.

[0044] Furthermore, if Figure 1-Figure 3 As shown, a plurality of fixed bridges 4 are provided on the outer peripheral surface of the high-pressure water pipe 2 and arranged at intervals along the circumference of the high-pressure water pipe 2. The fixed bridges 4 are connected between the outer peripheral surface of the high-pressure water pipe 2 and the inner peripheral surface of the liquid supply pipe 3. That is, the high-pressure water pipe 2 is connected to the liquid supply pipe 3 through the fixed bridges 4, and the two form an integrated structure, thereby improving the stability of the installation of the high-pressure water pipe 2, avoiding the high-pressure water pipe 2 from bending, and preventing the high-pressure liquid from flowing smoothly to the adapter 13.

[0045] It can be understood that due to the different depths of the ground stress test, the high-pressure water pipe 2 and the liquid supply pipe 3 can be installed in the test hole in multiple sections. Each section of the high-pressure water pipe 2 and the liquid supply pipe 3 can be interconnected through a fixed bridge 4 to form a segmented dual-channel pipe structure. Preferably, when each section of the dual-channel pipe is connected to each other, the high-pressure water pipes 2 can be connected by plugging and unplugging, and the liquid supply pipes 3 can be connected by threading.

[0046] It should be noted that the setting of the fixed bridge 4 should avoid blocking the flow channel between the high-pressure water pipe 2 and the liquid supply pipe 3. In addition, the specifications of the fixed bridge 4 should be consistent, so that the high-pressure water pipe 2 can be set in the center of the liquid supply pipe 3 to avoid the high-pressure water pipe 2 and the liquid supply pipe 3 from being stuck in the test hole during the placement process, thereby affecting the working efficiency of the ground stress test.

[0047] Furthermore, if Figure 1-Figure 3 As shown, the second expansion chamber has a liquid outlet at one end away from the adapter 13, and an air induction valve 17 is provided at the liquid outlet.

[0048] It should be noted that there is residual gas in the first expansion chamber and the second expansion chamber before expansion and pressurization. The pressurized liquid input by the liquid supply pipe 3 will compress this part of the gas, thereby causing damage to the sealing structure 143 of the first expansion section 11 or the second expansion section 12. In the present application, the second expansion chamber is additionally provided with an air induction valve 17. When the pressurized liquid compresses the residual gas, the air induction valve 17 is in an open state. At this time, the residual gas can be discharged from the liquid outlet, and when the residual gas is discharged, the pressurized liquid can continue to squeeze the air induction valve 17 until the liquid outlet is closed, thereby improving the durability of the device.

[0049] Furthermore, if Figure 1 、 Figure 4 and Figure 5 As shown, the liquid supply pipe 3 is made of hard material.

[0050] It is understandable that the test hole cannot be guaranteed to be constructed completely straight, but the hard material pipe can be used as a pipe that is not easy to bend during the process of being placed in the test hole, ensuring that the ground stress test device can be installed smoothly and improving the work efficiency of the ground stress test.

[0051] In addition, the liquid supply pipe 3 made of hard material can serve as the main load-bearing structure, which can push or pull the expansion sealing component 1 to ensure that the expansion sealing component 1 remains at the measuring depth of the test hole. At this time, the high-pressure water pipe 2 installed in the liquid supply pipe 3 can be made of flexible material, which greatly reduces the production cost of the stress testing device.

[0052] Furthermore, if Figure 1-Figure 3 As shown, the impact channel 14 includes a straight section 141 and a side straight section 142. The straight section 141 extends along the length direction of the high-pressure water pipe 2, and the side straight section 142 extends along the radial direction of the high-pressure water pipe 2 and is open toward the hole wall. The liquid outlet end of the high-pressure water pipe 2 fits in the straight section 141, and a sealing structure 143 is provided between the outer circumference of the high-pressure water pipe 2 and the inner circumference of the straight section 141.

[0053] In other words, one end of the straight section 141 is connected to the high-pressure water pipe 2, and the other end is connected to the straight section 141. The high-pressure liquid first enters the straight section 141 along the axial direction of the test hole from the high-pressure water pipe 2, and then flows from the straight section along the radial direction of the test hole to the hole wall at the other end of the straight section 141, thereby pressurizing the closed fracturing section.

[0054] It can be understood that the high-pressure water pipe 2 can pass through the first expansion chamber and communicate with the liquid inlet of the straight section 141, that is, the high-pressure water pipe 2 is inserted into the liquid inlet of the straight section 141. Therefore, adding a sealing mechanism at the connection between the high-pressure water pipe 2 and the straight section 141 can prevent high-pressure liquid from flowing into the first expansion chamber and affecting the pressurization efficiency of the ground stress test.

[0055] Furthermore, if Figure 1-Figure 3 As shown, the connecting end of the straight section 141 and the side straight section 142 is provided with a throttling constriction, and the end of the high-pressure water pipe 2 located in the straight section 141 is separated from the throttling constriction. Therefore, the throttling constriction can throttle and increase the speed of the liquid flowing to the hydraulic fracturing section, thereby improving the impact effect of the liquid.

[0056] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0057] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0058] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0059] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0060] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0061] Although the above embodiments have been shown and described, it is understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those skilled in the art are all within the scope of protection of the present invention.

Claims

1. A ground stress testing device, characterized in that: The expansion sealing assembly comprises an expansion sealing assembly and a high-pressure water pipe, wherein the expansion sealing assembly comprises a first expansion section, a second expansion section and an adapter arranged in sequence along its length direction, the first expansion section and the second expansion section are respectively sealed and connected to both sides of the adapter, and at least one of the first expansion section and the second expansion section is movably connected to the adapter, the high-pressure water pipe extends into the expansion sealing assembly along the first expansion section, and the water outlet of the high-pressure water pipe is located in the adapter, the high-pressure water pipe is made of a flexible material, the high-pressure water pipe bends and deforms as the first expansion section expands, and can recover after the first expansion section is depressurized. In its original state, the adapter is provided with an impact channel, one end of which is connected to the water outlet of the high-pressure water pipe, and the other end of which is open toward the hole wall; the impact channel includes a straight section and a side straight section, the straight section extending along the length direction of the high-pressure water pipe, the side straight section extending along the radial direction of the high-pressure water pipe and open toward the hole wall, the liquid outlet end of the high-pressure water pipe fits within the straight section, and a sealing structure is provided between the outer circumferential surface of the high-pressure water pipe and the inner circumferential surface of the straight section, a throttling constriction is provided at the connecting end of the straight section and the side straight section, and the end of the high-pressure water pipe located within the straight section is spaced apart from the throttling constriction; The apparatus further comprises a liquid supply pipe, wherein the first expansion section has a first expansion cavity, the second expansion section has a second expansion cavity, the liquid supply pipe is in communication with both the first expansion cavity and the second expansion cavity, the liquid supply pipe is made of a hard material pipe, the water inlet of the high-pressure water pipe is fitted in the liquid supply pipe, and the portion of the high-pressure water pipe located in the liquid supply pipe is spaced apart from the inner circumferential surface of the liquid supply pipe; The adapter has a communication channel, and the communication channel can connect the first expansion chamber and the second expansion chamber, and the liquid supply pipe is connected to the first expansion chamber.

2. The ground stress testing device according to claim 1, characterized in that: The first expansion section has a liquid inlet at one end away from the adapter, and the liquid supply pipe is connected to the liquid inlet and is arranged along the length direction of the high-pressure water pipe.

3. The ground stress testing device according to claim 1, characterized in that: A plurality of fixed bridges are provided on the outer circumferential surface of the high-pressure water pipe and are spaced apart along the circumference of the high-pressure water pipe. The fixed bridges are connected between the outer circumferential surface of the high-pressure water pipe and the inner circumferential surface of the liquid supply pipe.

4. The ground stress testing device according to claim 1, characterized in that: The second expansion chamber has a liquid outlet at one end away from the adapter, and an air induction valve is provided at the liquid outlet.

5. The ground stress testing device according to claim 1, characterized in that: The liquid supply pipeline is made of hard material.

Images