Interbedding rock mass sample preparation device considering high osmotic pressure and high stress

Abstract

The utility model provides an interbed rock mass sample preparation device considering high osmotic pressure and high stress. The interbed rock mass sample preparation device comprises a water tank assembly nested outside a pressing mold and a pressing assembly, the pressing mold externally-nested water tank assembly comprises a water tank, a pressing mold, a pressure-bearing baffle, an external pipeline and a return valve. The pressing assembly comprises a connecting platform, a supporting rod and a pressure applying platform. According to the utility model, the water tank assembly is nested outside the pressing mold and the pressing assembly is arranged, so that the generation process of interbed rock mass under the action of high osmotic pressure and high stress environment can be simulated based on similar tests, the interbed rock mass can be prepared into a sample, and the sample meeting various test requirements can be obtained by adjusting osmotic pressure and stress; various interbed rock mass mechanical property test researches are carried out, the reliability and accuracy of interbed rock mass mechanical property tests are improved, and a basis is provided for in-depth research of interbed rock mass and design of actual engineering measures.

Description

Technical Field

[0001] The utility model relates to the technical field of rock mass tests, and particularly relates to a device for preparing an interbedded rock mass sample under high osmotic pressure and high stress conditions. Background Art

[0002] Interbedded rock mass refers to a unique geological structure formed by the alternating deposition of two or more different types of rock strata during the geological process. Such rock masses often have poor stability, complex deformation and failure modes, unstable water permeability, etc., which greatly increase the difficulty and safety of construction in interbedded rock masses. Therefore, in-depth research on interbedded rock masses and appropriate engineering measures are required to ensure the smooth progress and safety and stability of projects in interbedded rock masses.

[0003] However, due to the complex bedding structure of interbedded rock masses, large differences in rock mechanical properties, easy disturbance during the sampling process, and high requirements for sampling equipment and technology, it is difficult to obtain samples of interbedded rock masses. Currently, the main method for obtaining samples of interbedded rock masses is similarity testing. By selecting appropriate similar materials and a predetermined process flow, the forming process of rocks is simulated to obtain samples under test conditions. However, there is currently no relatively mature device for preparing samples of interbedded rock masses. Most use simple molds for sample preparation, and the prepared samples of interbedded rock masses are often relatively single and difficult to meet various test requirements. Summary of the Utility Model

[0004] The purpose of the utility model is to provide, in view of the deficiencies in the above background art, a device for preparing an interbedded rock mass sample, which can simulate the formation process of interbedded rock masses under the action of high osmotic pressure and high stress environments through similarity testing and prepare them into samples. At the same time, samples that meet various test requirements can be obtained by adjusting the osmotic pressure and stress for various mechanical property test studies of interbedded rock masses.

[0005] To achieve the above purpose, the utility model provides a device for preparing an interbedded rock mass sample under high osmotic pressure and high stress conditions, including a water tank assembly nested outside a pressing mold and a pressing assembly;

[0006] The water tank assembly nested outside the pressing mold includes a water tank, a pressing mold, a pressure-bearing baffle, an external pipeline, and a reflux valve. The water tank is nested outside the pressing mold. The pressing mold is provided with an upper feed port and a lower discharge port. Materials for sample preparation are placed inside the pressing mold. The first end of the external pipeline is communicated with the water tank, the second end of the external pipeline is connected to a water pump, and a plurality of reflux valves are arranged and distributed on the side wall of the pressing mold to communicate the pressing mold with the water tank. The pressure-bearing baffle is arranged at the position of the lower discharge port of the pressing mold;

[0007] The pressing assembly includes a connection platform, a support rod, and a pressing platform. The upper and lower ends of the support rod are fixedly connected to the connection platform and the pressing platform respectively. The connection platform is connected to a pressure testing machine, and the pressing platform can move within the pressing die and contact the upper surface of the specimen.

[0008] Furthermore, the water tank assembly nested outside the pressing die further includes a water pressure gauge. The water pressure gauge is arranged on the external pipeline and is used to measure the water pressure in the water tank.

[0009] Furthermore, first bolt holes are arranged on both sides of the upper feeding port of the pressing die. The first bolt holes are used to be fixed to the pressing platform through first bolts; second bolt holes are arranged on both sides of the lower feeding port of the pressing die. The second bolt holes are used to fix the pressure-bearing baffle through second bolts.

[0010] Furthermore, diagonal braces are also arranged between the support rod and the pressing platform and the connection platform.

[0011] Furthermore, the pressing die is arranged in a box shape.

[0012] The above solution of the present utility model has the following beneficial effects:

[0013] The device for preparing interlayer rock mass specimens under high osmotic pressure and high stress provided by the present utility model, through the setting of the water tank assembly nested outside the pressing die and the pressing assembly, can simulate the generation process of interlayer rock mass under the action of high osmotic pressure and high stress environment based on similarity tests, and prepare specimens. Specimens that meet various test requirements can be obtained by adjusting the osmotic pressure and stress, and various mechanical property tests of interlayer rock mass can be carried out, improving the reliability and accuracy of the mechanical property tests of interlayer rock mass, and providing a basis for the in-depth study of interlayer rock mass and the design of actual engineering measures;

[0014] Other beneficial effects of the present utility model will be described in detail in the subsequent specific implementation part. Description of the Drawings

[0015] Figure 1 It is a schematic diagram of the overall structure of the present utility model;

[0016] Figure 2 It is a schematic diagram of the water tank assembly nested outside the pressing die of the present utility model.

[0017]

Description of the Reference Numerals

[0018] 1 - Water tank; 2 - Pressing die; 3 - Pressure-bearing baffle; 4 - External pipeline; 5 - Return valve; 6 - Water pressure gauge; 7 - First bolt; 8 - Second bolt; 9 - Connection platform; 10 - Support rod; 11 - Pressing platform. Detailed implementation manners

[0019] To make the technical problems, technical solutions and advantages to be solved by the present utility model clearer, the following will be described in detail with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present utility model without creative efforts shall fall within the protection scope of the present utility model. In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0020] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model 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 construed as a limitation of the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0021] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a locking connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0022] As Figure 1 、 Figure 2 shown, the embodiment of the present utility model provides a preparation device for an interlayer rock mass sample under high osmotic pressure and high stress, which mainly includes: a water tank assembly nested outside a pressing mold and a pressing assembly.

[0023] Among them, the water tank assembly nested outside the pressing die includes a water tank 1, a pressing die 2, a pressure-bearing baffle 3, an external pipeline 4, a reflux valve 5, a water pressure gauge 6, etc. The pressing die 2 is arranged inside the water tank 1, that is, the water tank 1 is nested outside the pressing die 2. The pressing die 2 is a box-shaped structure provided with an upper feeding port and a lower discharging port, which is used to place the materials for specimen preparation. The pressing assembly can move inside the pressing die 2 to press the materials for specimen preparation. The first end of the external pipeline 4 is communicated with the water tank 1, and the second end of the external pipeline 4 can be connected to a water pump or the like to increase the water pressure. There are multiple reflux valves 5 arranged on the side wall of the pressing die 2 to communicate the pressing die 2 with the water tank 1 and ensure that the water pressure in the water tank 1 is the same as that in the pressing die 2. The water pressure gauge 6 is arranged on the external pipeline 4, preferably at the first end of the external pipeline 4, and is used to measure the water pressure in the water tank 1.

[0024] Among them, first bolt holes are arranged on both sides of the upper feeding port of the pressing die 2, and the first bolt holes are used to connect with the pressing assembly through the first bolts 7 to fix the pressing assembly and eliminate the influence of stress on the specimen. Second bolt holes are arranged on both sides of the lower feeding port of the pressing die 2. The pressure-bearing baffle 3 is arranged at the position of the lower feeding port and is fixed and sealed at the lower feeding port through the second bolts 8, which can be used for subsequent specimen demolding.

[0025] In this embodiment, the pressing assembly includes a connecting platform 9, a support rod 10, and a pressing platform 11. Among them, the connecting platform 9, the support rod 10, and the pressing platform 11 are arranged in sequence from top to bottom. The upper end and the lower end of the support rod 10 are fixedly connected to the connecting platform 9 and the pressing platform 11 respectively to form an integral structure. The connecting platform 9 is connected to the pressure testing machine, and the specimen in the pressing die 2 is pressed through the output of the pressure testing machine. Diagonal braces can be added to the support rod 10 to increase the load-bearing capacity of the pressing assembly. The pressing platform 11 can move inside the pressing die 2 and directly press the upper surface of the specimen. In addition, the pressing platform 11 can be fixed to the pressing die 2 through the first bolts 7.

[0026] When using the device provided by this embodiment to prepare the interlayer along-body specimen, the specific implementation steps are as follows:

[0027] S1. Select the materials of similar specimens and mix the soft layer and hard layer materials respectively;

[0028] S2. According to the layer thickness ratio and the distribution mode of soft and hard rock masses required by the test, gradually add the mixed materials into the pressing die 2, and each time after adding, the pressing assembly can be used to compact once;

[0029] S3. After the materials are completely added, if only high stress is considered, there is no need to connect a water pump at the external pipeline 4 or the water pump remains at normal pressure, and only a pressure tester needs to be connected at the connection platform 9 for pressurization; if only high osmotic pressure is considered, the pressure application platform 11 in the pressing assembly needs to be fixed to the pressing die 2 through the first bolt 7 to keep the entire pressing die 2 in a sealed state. The water tank 1 is pressurized by connecting a water pump through the external pipeline 4 to simulate a high osmotic pressure environment, and the water pressure gauge 6 measures the osmotic pressure inside the pressing die 2 according to the test requirements; if both high osmotic pressure and high stress factors are considered, the external pipeline 4 needs to be connected to a water pump, and the connection platform 9 is connected to a pressure tester. After the specimen is filled, stress pressurization can be carried out first, and then osmotic pressure can be applied, or stress pressurization and osmotic pressure application can be carried out simultaneously, but the applied stress should be greater than the osmotic pressure (note that it is strictly prohibited to apply osmotic pressure first and then stress, or the osmotic pressure is greater than the applied stress, because when this situation occurs, the pressing assembly may slide out from the upper end of the pressing die due to excessive osmotic pressure);

[0030] S4. Keep the pressure for a period of time after pressurization until the interlayer rock mass is formed and there is almost no deformation within a period of time.

[0031] S5. After the interlayer rock mass is formed, remove the applied water pressure and stress, disassemble the pressure-bearing baffle 3, and use the pressing assembly to apply pressure again for demolding.

[0032] S5. For the interlayer rock mass specimen after demolding, since the inclination angle of the obtained interlayer rock mass is fixed, a coring device needs to be used again to obtain core samples with various inclination degrees to meet various test requirements.

[0033] In summary, by using the device for preparing an interlayer rock mass specimen considering high osmotic pressure and high stress provided in this embodiment, the generation process of the interlayer rock mass under the action of a high osmotic pressure and high stress environment can be simulated through a similarity test and prepared into a specimen. Specimens that meet various test requirements can be obtained by adjusting the osmotic pressure and stress, and various mechanical property tests of the interlayer rock mass can be carried out.

[0034] The above is the preferred implementation mode of the present invention. It should be noted that for those of ordinary skill in the art, several improvements and refinements can be made without departing from the principle described in the present invention, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A device for preparing interbedded rock samples under high seepage pressure and high stress, characterized in that: include: The water tank assembly is nested outside the pressing mold and the pressing assembly; The water tank assembly nested outside the pressing mold comprises a water tank, a pressing mold, a pressure baffle, an external pipe, and a reflux valve. The water tank is nested outside the pressing mold, the pressing mold is provided with an upper feed port and a lower discharge port, the material for sample preparation is placed in the pressing mold, the first end of the external pipe is connected to the water tank, the second end of the external pipe is connected to a water pump, a plurality of reflux valves are provided and distributed on the side wall of the pressing mold so that the pressing mold is connected to the water tank, and the pressure baffle is provided at the lower discharge port of the pressing mold; The pressing assembly includes a connecting platform, a support rod and a pressure platform. The upper end and the lower end of the support rod are fixedly connected to the connecting platform and the pressure platform respectively. The connecting platform is connected to a pressure testing machine. The pressure platform can move in the pressing mold and contact the upper surface of the sample.

2. The device for preparing interbedded rock samples under high osmotic pressure and high stress according to claim 1, characterized in that: The water tank assembly nested outside the pressing mold also includes a water pressure gauge, which is arranged on the external pipeline and is used to measure the water pressure in the water tank.

3. The device for preparing interbedded rock samples under high osmotic pressure and high stress according to claim 1, characterized in that: First bolt holes are arranged on both sides of the upper feed port of the pressing mold, and the first bolt holes are used to fix to the pressure platform through first bolts; second bolt holes are arranged on both sides of the lower feed port of the pressing mold, and the second bolt holes are used to fix the pressure baffle through second bolts.

4. The device for preparing interbedded rock samples under high osmotic pressure and high stress according to claim 1, characterized in that: Diagonal braces are also provided between the support rod, the pressure platform and the connecting platform.

5. The device for preparing interbedded rock samples under high osmotic pressure and high stress according to claim 1, characterized in that: The pressing mold is configured in a box shape.

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