Strength testing device for simulating stress state of underground in-situ filling body
By designing a strength testing device that simulates the stress state of in-situ underground backfill, and using a purely mechanical structure to simulate the stress conditions of underground backfill, the problem of error in underground backfill strength testing was solved, achieving efficient and low-cost test results and ensuring mining safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHINA MINMETALS CHANGSHA MINING RES INST
- Filing Date
- 2025-03-31
- Publication Date
- 2026-04-17
AI Technical Summary
Existing technologies for testing the strength of underground mine backfill in the laboratory cannot simulate the actual temperature and humidity conditions underground, resulting in significant errors between the test results and the actual strength of underground backfill, which affects mining safety and efficiency.
A strength testing device for simulating the stress state of in-situ downhole filling material is designed. It adopts a purely mechanical structure and simulates the stress conditions of downhole filling material through a pressurization device and a sealing component to achieve accurate strength testing of the filling material.
It improves the reliability and accuracy of filling strength testing, is suitable for complex downhole environments, reduces costs, is suitable for large-scale testing, and provides a safe and reliable guarantee for recovery.
Smart Images
Figure CN224137039U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of mine backfilling technology, specifically to a strength testing device that simulates the stress state of in-situ backfill bodies underground. Background Technology
[0002] In uniaxial compressive stress tests of backfill strength, ordinary test molds are commonly used. These molds are filled with slurry and placed in a constant temperature and humidity chamber until the required curing time is reached before the test. This method cannot simulate the stress state of the backfill. Because backfilling in underground goaf areas involves varying temperature and humidity conditions, and because the backfill slurry gradually forms a backfill of a certain strength under stress, with the development of backfill mining technology, mines urgently need to improve the precision control of the entire backfilling process to ensure safe mining and ore extraction efficiency. However, due to the limitations of current common strength testing methods, the results of backfill strength tests have significant errors compared to the actual strength of large-volume backfill in underground mines. In-situ core sampling is typically used for testing, which is a post-hoc inspection. Even if strength problems are found, there is no way to remedy them, or the cost of remedy is too high. Solving the technical difficulties of conducting backfill strength tests in a laboratory setting that closely simulates the actual backfilling environment in mines is crucial for achieving safe and efficient backfill mining.
[0003] In view of this, it is necessary to design an improved strength testing device to simulate the stress state of in-situ downhole filling bodies in order to solve the above problems. Utility Model Content
[0004] In view of the technical problems existing in the background art, this application provides a strength test device for simulating the stress state of in-situ well filling bodies. The device is designed with a purely mechanical approach to realize in-situ pressure simulation in wells.
[0005] This application provides a strength testing device for simulating the stress state of in-situ well filling bodies, including a mold body and a pressurizing device disposed above the mold body. The mold body has a slurry chamber inside, a top sealing assembly is disposed at the top of the slurry chamber, and a bottom plate is disposed at the bottom of the slurry chamber. The top sealing assembly includes a top plate and a pressurizing chamber disposed above the top plate. The top plate has a plurality of air and slurry channels.
[0006] As a further improvement of this application, the pressurized chamber is connected to the slurry chamber through the air and slurry channel.
[0007] As a further improvement of this application, a pressurizing sliding module is provided on the top of the pressurizing chamber.
[0008] As a further improvement of this application, the top plate and the bottom plate are fixed by locking screws.
[0009] As a further improvement of this application, O-rings are respectively provided at the connection between the bottom plate and the top plate and the slurry chamber.
[0010] As a further improvement of this application, an O-ring is provided at the connection between the pressurizing sliding module and the pressurizing chamber.
[0011] As a further improvement of this application, the pressurizing device is disposed above the pressurizing sliding module.
[0012] As a further improvement to this application, the pressurizing device is a weight.
[0013] The beneficial effects of this application are as follows:
[0014] This application provides a strength testing device for simulating the stress state of in-situ downhole backfill materials. The device includes a mold body and a pressurizing device positioned above the mold body. The mold body contains a slurry chamber, with a top sealing assembly at the top and a bottom plate at the bottom. The top sealing assembly includes a top plate and a pressurizing chamber positioned above the top plate. Several air and slurry channels are provided on the top plate. This application, through its simple and practical design, can easily simulate the stress conditions of downhole backfill materials. The device can be placed in a specified temperature and humidity chamber / room or directly downhole to conduct precise strength tests on backfill materials under specified conditions. This solves the problem of discrepancies between conventional backfill strength tests and actual downhole environments, improving test reliability and providing a reliable guarantee for safe mining operations. Furthermore, the device adopts a purely mechanical structure, making it easy to use, low in cost, and applicable to various complex and harsh downhole environments.
[0015] This application employs a purely mechanical approach, eliminating the need for additional temperature, humidity, and pressure control systems. Its simple and durable structure allows it to adapt to complex underground environments and facilitates numerous repeated tests. Customized for batch production based on actual testing requirements, it is low-cost, easy to operate, and suitable for low-cost, high-volume testing, making it ideal for daily use in mining laboratories. The testing device itself only has pressure control functionality; by placing it in a designated temperature and humidity chamber / room or underground, it can simulate strength tests under corresponding conditions. It is simple, practical, and expandable, such as by adding appropriate monitoring modules.
[0016] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description
[0017] To more clearly illustrate the technical solution of this application, the accompanying drawings used in this application will be briefly described below. Obviously, the drawings described below are merely some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without any creative effort.
[0018] Figure 1 This is a schematic diagram of the strength testing device for simulating the stress state of in-situ downhole filling bodies provided in the embodiments of this application;
[0019] Explanation of reference numerals in the attached drawings: 1. Slurry chamber; 21. Top plate; 22. Pressurized chamber; 23. Air and slurry channel; 24. Pressurized sliding module; 3. Bottom plate; 4. Locking screw; 5. O-ring seal; 6. Pressurization device; 7. Experimental slurry. Detailed Implementation
[0020] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.
[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.
[0022] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.
[0023] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.
[0024] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.
[0025] Because the filling of underground goaf areas in mines has different temperature and humidity conditions, and the filling slurry gradually forms a filling body with a certain strength under stress, when conducting uniaxial compressive stress tests on the strength of the filling body, ordinary test molds are generally used. After being filled with slurry, they are placed in a constant temperature and humidity insulated chamber and the test is carried out after the required curing period. This method cannot simulate the stress state of the filling body.
[0026] To address the technical problem that conventional backfill strength tests do not match the actual downhole environment, this application provides a strength testing device that simulates the stress state of in-situ downhole backfill. Through mechanical structure design, it simulates the stress conditions of downhole backfill to conduct accurate backfill strength tests, thereby improving the reliability of the test and providing a reliable guarantee for safe mining.
[0027] Please refer to Figure 1 This is a schematic diagram of the strength testing device for simulating the stress state of in-situ well filling bodies provided in this application embodiment. The device includes a mold body and a pressurizing device 6 disposed above the mold body. The mold body has a slurry chamber 1 for containing filling slurry. A top sealing assembly is disposed on the top of the slurry chamber 1, and a bottom plate 3 is disposed on the bottom of the slurry chamber 1. The design of the top sealing assembly and the bottom plate 3 reduces the risk of slurry leakage and ensures the safety of the test process. The top sealing assembly includes a top plate 21 and a pressurizing chamber 22 disposed above the top plate 21. Several air and slurry channels 23 are disposed on the top plate 21. The pressurizing chamber 22 communicates with the slurry chamber 1 through the air and slurry channels 23. With this configuration, the slurry in the slurry chamber 1 can enter the pressurizing chamber 22 through the air and slurry channels 23, forming a uniform slurry. Meanwhile, the pressure in the pressurized chamber 22 can be evenly transmitted to the slurry chamber 1, making the pressure on the filling slurry more uniform during the test, thus obtaining more accurate strength test results.
[0028] Furthermore, in this embodiment, a pressurizing sliding module 24 is provided at the top of the pressurizing chamber 22. The pressurizing device 6 is positioned above the pressurizing sliding module 24. This configuration allows for more accurate simulation of pressure conditions at different depths downhole by adjusting the weight of the pressurizing device 6 as needed. The design of the pressurizing sliding module 24 helps achieve a more uniform pressurization effect, avoiding experimental errors caused by uneven pressure.
[0029] Furthermore, in this embodiment, the top plate 21 and the bottom plate 3 are fixed by locking screws 4. This arrangement provides sufficient fastening force to ensure that the top plate 21 and the bottom plate 3 remain stable during the test and will not shift due to pressure. At the same time, the locking screws 4 allow for quick and easy assembly and disassembly of the top plate 21 and the bottom plate 3, facilitating mold cleaning, maintenance, and replacement.
[0030] Furthermore, in this embodiment, O-rings 5 are respectively provided at the connection points between the bottom plate 3 and the top plate 21 and the slurry chamber 1. O-rings 5 are also provided at the connection point between the pressurizing sliding module 24 and the pressurizing chamber 22. This arrangement prevents slurry leakage during pressurization, ensuring the accuracy and safety of the test.
[0031] Furthermore, in this embodiment, the pressurizing device 6 is a weight. By using a suitable weight, a specified pressure is applied to simulate the stress state of the in-situ filling material in the well. In other embodiments of this application, other pressure-applying devices can be used as needed, as long as they meet the pressure requirements; all are within the scope of protection of this application. The dimensions of the test device can be customized according to actual conditions.
[0032] The working principle of the strength testing device for simulating the stress state of in-situ well filling provided in this application is as follows:
[0033] S1. Apply vacuum grease to the bottom O-ring 5 to seal the connection between the bottom plate 3 and the slurry chamber 1;
[0034] S2. Apply a thin layer of silicone oil to the inside of the slurry chamber 1 to minimize friction between the experimental slurry 7 and the mold;
[0035] S3. The experimental slurry 7 was poured into the slurry chamber 1 in three layers. Each layer was stirred several times with a stirring rod to avoid air voids in the sample.
[0036] S4. Place the top plate 21 and seal it with the O-ring 5. Excess slurry enters the pressurized chamber 22 through the air and slurry channel 23 to obtain a sample with a uniform top surface.
[0037] S5. Tighten the locking screw 4, add experimental slurry 7 to the top pressurized chamber 22 in the same way as step S3, and seal in the same way as step S4. After completion, load a certain mass weight as required to simulate the stress on the filling body.
[0038] S6. Place the device in a constant temperature and humidity insulated chamber or directly in a designated location underground to achieve the environmental conditions for conducting in-situ simulated strength tests;
[0039] S7. After curing, perform strength tests at the required curing age.
[0040] This application employs a purely mechanical design to achieve in-situ downhole pressure simulation. It is simple and practical, and with appropriate conditions, can perform full in-situ downhole strength tests. Compared to conventional strength testing methods, this testing device can more closely simulate actual downhole filling conditions, obtaining more reliable test data. It is simple to design, easy to use, and improves the reliability and efficiency of the test.
[0041] It should be noted that this application is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and effect as the technical concept within the scope of this application are included in the technical scope of this application. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of this application, are also included in the scope of this application.
Claims
1. A strength testing device for simulating the stress state of in-situ well filling material, characterized in that, The device includes a mold body and a pressurizing device disposed above the mold body. The mold body has a slurry chamber inside, a top sealing assembly is disposed at the top of the slurry chamber, and a bottom plate is disposed at the bottom of the slurry chamber. The top sealing assembly includes a top plate and a pressurizing chamber disposed above the top plate. The top plate has a plurality of air and slurry channels.
2. The strength testing apparatus for simulating a stress state of a packer in a well according to claim 1, wherein The pressurized chamber is connected to the slurry chamber through the air and slurry channels.
3. The strength testing apparatus for simulating the stress state of a packer in situ in a well according to claim 2, characterized in that, A pressurizing sliding module is provided at the top of the pressurizing chamber.
4. The strength testing apparatus for simulating the stress state of a packer in situ in a well according to claim 1, characterized by The top plate and the bottom plate are fixed by locking screws.
5. The strength testing apparatus for simulating the stress state of a packer in situ in a well according to claim 4, wherein O-rings are provided at the connection points between the bottom plate and the top plate and the slurry chamber.
6. The strength testing apparatus for simulating the stress state of a packer in situ in a well according to claim 3, wherein An O-ring is provided at the connection between the pressurizing sliding module and the pressurizing chamber.
7. The strength testing apparatus simulating the stress state of a packer in situ in a well according to claim 3, characterized in that, The pressurizing device is positioned above the pressurizing sliding module.
8. The strength testing apparatus simulating the stress state of a packer in situ in a well according to claim 7, characterized in that, The pressurizing device is a weight.