Preparation method and preparation device of fissured rock mass similar material for simulation analysis

Abstract

The present invention relates to the technical field of rock mass detection, and specifically discloses a preparation method and a preparation device for a fractured rock mass similar material for simulation analysis. The method includes: (S1) obtaining the performance data of the rock in the fracture zone at the engineering site through in-situ testing, and then calculating the required similar physical parameters in the simulation test through similarity criteria and configuring the aggregate and slurry of the fractured zone similar material; (S2) filling the aggregate into a mold and pumping in the slurry to prepare a fractured similar specimen; (S3) testing the performance data of the specimen, and then comparing it with the similar physical parameters in (S1), obtaining the optimal pumping parameters and preparing the fractured rock mass similar material based on this. The above-mentioned preparation method of the fractured rock mass similar material of the present invention makes the simulated rock mass similar material closer to the actual project, effectively overcoming the problem that the rock mass similar material made by the prior art cannot obtain accurate simulation results for the fractured rock mass, affecting the authenticity and reliability of the physical simulation test.

Description

Technical Field

[0001] The present invention relates to the technical field of simulation analysis and detection of fractured rock masses, and particularly to a preparation method and a preparation device for a similar material of a fractured rock mass for simulation analysis. Background Art

[0002] Disclosing the information of this background art section is only intended to increase the understanding of the overall background of the present invention, and it is not necessarily regarded as an admission or an indication in any form that this information constitutes the prior art already known to those of ordinary skill in the art.

[0003] The strength of fractures in rocks has an important impact on the mechanical properties of the entire rock, such as compressive strength and tensile strength. The mechanical properties and permeability of fractures have a significant impact on the accuracy of physical simulation tests. At the engineering site, the mechanical parameters and permeability of fractures can be obtained through methods such as obtaining, collecting, and monitoring the information of fractured rock masses. However, under the conditions of being separated from the engineering project site, there is a lack of technology for preparing similar materials for rock mass fractures, especially in the case of mechanical strength and permeability.

[0004] For example, the patent document with the application number 202310881670.8 discloses a method for preparing and a method for a similar simulation rock layer specimen with joint fractures. Through a specimen preparation box and two side inserts, it correspondingly simulates the horizontal joint fractures and vertical joint fractures of the rock layer, thereby preparing a similar simulation rock layer specimen containing joint fractures, and can correspondingly simulate the horizontal joint fractures and vertical joint fractures of the rock layer for mechanical experimental research on the similar simulation rock layer specimen containing joint fractures. However, this technology only maintains consistency in attitude with the rock, and other mechanical consistencies are not guaranteed, affecting the accuracy of physical simulation tests.

[0005] Again, for example, the patent document with the application number 202110563814.6 discloses a true triaxial specimen making mold and a forming method for a deep rock similar material, which solves the problems of poor single-sided compaction uniformity, low precision, the need for secondary grinding and processing after sample formation, large demolding disturbance, and difficulty in making true triaxial specimens in the prior art. However, in fact, after complex geological processes, structural planes will be formed inside the rock. And the above patent technology simulates the production of true triaxial specimens of deep rock similar materials and cannot simulate similar materials for rock fractures.

[0006] In summary, although the prior art has made certain progress in the preparation of rock similar models, the prepared rock mass similar materials cannot obtain accurate simulation results for fractured rock masses, affecting the authenticity and reliability of physical simulation tests. Summary of the Invention

[0007] In view of the above problems, the present invention proposes a preparation method and a preparation device for a fractured rock mass similar material for simulation analysis. The prepared fractured rock mass similar material is closer to the actual project, improving the accuracy of test results and the practical application value. Specifically, the technical solution of the present invention is as follows.

[0008] First, the present invention provides a preparation method for a fractured rock mass similar material for simulation analysis, including the following steps:

[0009] (S1) Obtain the compressive strength and permeability data of the rock in the fracture zone at the engineering site through in-situ testing. Then, according to these data and through similarity criteria, calculate the similarity parameters required for the simulation test, and based on these parameters, configure the slurry and aggregate required for preparing the fracture zone similar material.

[0010] (S2) Fill the aggregate in step (S1) into the mold until it is filled with the mold in a natural accumulation state. Then, pump and inject the slurry in step (S1) into the mold until it is full. After completion, cure and demold to obtain a fracture similar specimen. Prepare fracture similar specimens under different pumping parameters in the same way and set them aside for use.

[0011] (S3) Test the compressive strength and permeability of each of the fracture similar specimens obtained in step (S2). Then, calculate through similarity criteria and compare with the similarity parameters in step (S1). Use the pumping parameter of the fracture similar specimen closest to the similarity parameter as the optimal pumping parameter for standby.

[0012] (S4) Configure the similar material of the base rock at the engineering site in step (S1) according to similarity criteria, and then lay this material in the model box for physical simulation tests. Then, inject the slurry configured in step (S1) into the model box using the optimal pumping parameter in step (S3) until it is full. After completion, cure and demold to obtain the fractured rock mass similar material.

[0013] Further, in step (S1), the slurry includes a cementitious material and water, and the determination method of the slurry and aggregate is as follows: Mix the slurry and aggregate evenly to form a cement-based material, pour it into a mold, cure it under standard conditions for 24 - 36 hours after hardening and demolding to obtain a specimen. Then, change the proportions of the cementitious material, water, and aggregate, and the aggregate particle size, and use the above method to prepare specimens. Test the compressive strength and permeability of these specimens. If the difference values between the test results and the compressive strength and permeability in the similarity parameters in step (S1) are within 2%, the corresponding cementitious material and water can be used as the slurry in step (S1), and the corresponding aggregate can be used as the aggregate in step (S1).

[0014] Further, in step (S2), after closing the top port of the mold, the slurry is injected until the grouting flow rate is less than the set value, at which point it is considered that the gap in the mold is filled with the slurry, and then the grouting is stopped. Optionally, the set value is 4 - 6 m 3 / h.

[0015] Further, in step (S2), the inner surface of the mold is coated with a release agent to facilitate demolding after the curing is completed to obtain the fissure similar specimen. Similarly, in step (S4), the inner surface of the model box is also coated with a release agent.

[0016] Further, in steps (S2) and (S4), the curing time is 1 - 2 days.

[0017] Further, in step (S2), the mold includes any one of a standard mold and a scaled - down mold.

[0018] Further, in step (S2), the pumping parameters include the pumping frequency (n) and the pumping time (t). The pumping frequency (n) refers to the number of pumpings per minute when pumping the slurry.

[0019] Further, in step (S4), the similar materials of the base rock at the engineering site include the following components: quartz sand, cement, barite powder, talc powder, silicone oil, and water. The ratio of each component can be selected according to actual needs.

[0020] Secondly, the present invention provides a preparation device for a fissured rock mass similar material for simulation analysis, including: a mold, a rotating table, a cover body, a rotary joint, a delivery pump, a slurry tank, and a return pipe. Among them: The mold is detachably and fixedly connected to the rotating table so as to rotate with the rotating table. The cover body is detachably covered on the top port of the mold, the rotary joint is rotatably connected to the grouting port on the cover body, and the rotary joint, the delivery pump, and the slurry tank are connected in sequence. The bottom liquid outlet of the mold is rotatably connected to the return pipe, the other end of the return pipe is communicated with the slurry tank, and a screen for blocking the aggregate is provided in the liquid outlet.

[0021] Further, a flow monitoring element is provided on the grouting pipeline between the rotary joint and the delivery pump for monitoring the flow rate change of the grouting pipe.

[0022] Further, the flow monitoring element is connected to a control system, and this control system is connected to the delivery pump to control the grouting pressure of the delivery pump.

[0023] Further, the rotating table is of an annular structure, and the return pipe passes through this annular structure and is rotatably connected to the bottom liquid outlet of the mold.

[0024] Furthermore, a flange is fixed on the lower side wall of the mold, and an annular tray is fixed on the upper surface of the rotating table. The flange and the annular tray are detachably connected by fasteners, and the bottom surface of the mold is in a suspended state.

[0025] Compared with the prior art, the present invention has at least the following beneficial technical effects: (1) The method of the present invention prepares fissure similar specimens based on the compressive strength and permeability data of rock in the fissure zone at the engineering site, making the simulated rock fissure similar material closer to the actual rock at the engineering site, effectively overcoming the problem that the rock mass similar material prepared by the traditional technology cannot obtain accurate simulation results for fissured rock masses, affecting the authenticity and reliability of physical simulation tests. (2) The present invention also provides a device for preparing fissured rock mass similar material, filling the gap in the device for preparing crack rock similar material. In addition, the mold of the present invention can also rotate, solving the problem of uneven distribution of the similar material slurry during the penetration process and improving the quality of the prepared crack rock similar material. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings forming a part of this specification are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0027] Figure 1 The compressive strength-strain curve of the fissure similar specimen prepared for the following Example 1.

[0028] Figure 2 The permeability coefficient test chart of the fissure similar specimen prepared for the following Example 1.

[0029] Figure 3 The structural schematic diagram of the device for preparing fissure similar material for simulation analysis in the following Example 2.

[0030] Figure 4 The schematic diagram of the funnel structure in the device for preparing fissure similar material in the following Example 2.

[0031] The above Figure 3 and Figure 4 The numerical markings in represent respectively: 1 - mold, 2 - rotating table, 3 - cover body, 4 - rotary joint, 5 - delivery pump, 6 - slurry tank, 7 - return pipe, 8 - flow monitoring element, 9 - flange, 10 - annular tray, 11 - funnel structure, 12 - servo motor. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention pertains.

[0033] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should also be understood that when the terms "comprising" and / or "including" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0034] For the convenience of description, if the words "upper", "lower", "left", and "right" appear in the present invention, they only indicate the same directions as the upper, lower, left, and right of the attached drawings themselves, and do not limit the structure. They are only for facilitating the description of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to needs to have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present invention.

[0035] The method for preparing a fractured rock mass similar material for simulation analysis according to the present invention and its preparation device will be further described in conjunction with the attached drawings of the specification and specific embodiments.

[0036] Example 1:

[0037] Taking the "Full-life Cycle Surrounding Rock Stress Seepage Coupling Field Water-sealing Simulation Test Project of Rock Cavern Underground Storage" as the research object, the method proposed by the present invention for preparing a fractured rock mass similar material for simulating and analyzing this research object will be further described. Specifically, the preparation process includes the steps:

[0038] (S1) Obtain the compressive strength and permeability data of the fracture zone of the rock at the engineering site through in-situ testing / field testing: compressive strength = 106.19 MPa, permeability coefficient = 1.9423×10 -7 m / s. Then, according to the fluid-solid coupling similarity criterion, calculate the scale ratio of the similar material. Through the model size and simulation range, determine the geometric similarity scale ratio (C l = 100). According to the similarity simulation criterion under three-dimensional solid-fluid coupling action (reference: Three-dimensional Solid-fluid Coupling Similarity Simulation Theory and Method, Hu Yaoqing et al., Journal of Liaoning Technical University (Natural Science Edition), 2007), determine the scale ratio of the model similar material. The specific results are shown in Table 1 below.

[0039] Table 1

[0040]

[0041] According to the parameters in Table 1 above and referring to the above references, the results of the similarity parameters required for the simulation test are calculated as follows: compressive strength = 1.0619 MPa, permeability coefficient = 1.9423×10 -8 m / s.

[0042] (S2) Based on the above similarity parameters, using white Portland cement, sand and gravel, and water as raw materials, prepare the similar material for the fracture zone. Specifically, mix the white Portland cement, sand and gravel, and water evenly, then pour them into a mold, demold after hardening and forming, and then place them in a standard curing box (temperature maintained at 20±2 °C, humidity maintained between 95~97%) for 24 hours. After completion, test the compressive strength and permeability coefficient of the specimens obtained. Through orthogonal tests, when the mass ratio of white Portland cement, water, and sand and gravel is 4.1:3.3:3.6, and the sand and gravel particle size is continuously graded between 1~1.5 cm, the compressive strength and permeability coefficient of the specimens obtained are respectively within 2% of the corresponding indicators in the above similarity parameters (compressive strength = 1.0619 MPa, permeability coefficient = 1.9423×10 -8 m / s). Therefore, use the mixture formed by the mass ratio of the white Portland cement and water of 4.1:3.3 as the slurry, and use the sand and gravel with a continuously graded particle size between 1~1.5 cm as the aggregate, and set aside.

[0043] (S4) Test the compressive strength and permeability coefficient of each of the fracture similar specimens prepared in the above step (S3), and record the test results of each of the fracture similar specimens (as shown in Table 2 below). The attached instruction Figure 1 is the compressive strength-strain curve of the fracture similar specimen obtained when the pumping frequency n = 2, Figure 2 and this is the permeability coefficient test chart of the fracture similar specimen.

[0044] Table 2

[0045]

[0046] (S5) Compare the performance test results (compressive strength, permeability coefficient) of each fracture similar specimen in Table 2 with the above similarity parameters (compressive strength = 1.0619 MPa, permeability coefficient = 1.9423×10 -8 m / s) in step (S1) above, and use the pumping parameters corresponding to the fracture similar specimen closest to this parameter as the best pumping parameters. It can be seen that when the pumping frequency n = 10 and the pumping time t = 5 min, the performance of the prepared fracture similar specimen (compressive strength = 1.13 MPa, permeability coefficient = 1.6402×10 -8The one closest to the above similar parameters is (m / s). Therefore, the optimal pumping parameters are obtained as follows: pumping frequency n = 10, pumping time t = 5 min.

[0047] (S6) Configure a material similar to the physical and mechanical properties of the base rock at the engineering site according to the similarity criterion (denoted as material a, formed by mixing components in the following proportions: 850 parts by weight of quartz sand, 159 parts by weight of 42.5 ordinary portland cement, 350 parts by weight of barite powder, 420 parts by weight of talc powder, 70 parts by weight of silicone oil, 200 parts by weight of water), and then lay this material a into the model box for physical simulation tests. Then, pump the slurry configured in step (S2) into the model box until it is full using the optimal pumping parameters in step (S5) (the mass ratio of the material a to the slurry is 10:1). Then, cure the model box together with the materials in it at room temperature for 2 days, and after demolding, obtain the fractured rock mass similar material. Its compressive strength is measured to be 1.1254 MPa, and the permeability coefficient is 1.8526×10 -8 m / s. It can be seen that the error rate of the compressive strength of the fractured rock mass similar material prepared by the method of this embodiment compared with the compressive strength of the rock at the engineering site is only 5.98%, and the error rate of the permeability coefficient is only 4.62%. While the error rate of the fractured rock mass similar material made by the traditional method is as high as over 10%. Therefore, the rock mass similar material for simulation analysis prepared by the method of this embodiment is closer to the actual project, effectively improving the accuracy of the test results and the practical application value.

[0048] Reference Figure 3 , an example of a preparation device for a fractured rock mass similar material for simulation analysis is provided, including: a mold 1, a rotating table 2, a cover 3, a rotary joint 4, a transfer pump 5, a slurry tank 6, and a return pipe 7. Specifically: the mold 1 is a cylindrical structure with both upper and lower ends open, and the rotating table 2 is an annular structure. A fixedly connected flange 9 is sleeved on the lower side wall of the mold 1, and an annular tray 10 is fixed on the upper surface of the rotating table 2. The flange 9 and the annular tray 10 are detachably fixed by bolts and other fasteners, and the bottom surface of the mold 1 is in a suspended state so that the mold 1 can be detachably connected to the rotating table 2. The rotating table 2 can adopt existing equipment and can rotate horizontally under the action of a driving mechanism, thereby driving the mold 1 to rotate synchronously. The mold 1, the rotating table 2, the flange 9, and the annular tray 10 are arranged along the same vertical axis.

[0049] The cover 3 is detachably covered on the top opening of the mold 1. For example, an external thread is provided on the outer side wall of the upper port of the cover 3, and the cover 3 is threadedly connected to the top opening of the mold 1. In a better embodiment, a sealing rubber ring is provided between the cover 3 and the top surface of the mold 1 to prevent the slurry from leaking during grouting. The rotary joint 4 is rotatably connected to the grouting port at the center of the upper surface of the cover 3 so as to grout into the inner cavity of the mold 1. The other end of the rotary joint 4, the delivery pump 5, and the slurry tank 6 are sequentially connected through a grouting pipeline, and the rotary joint 4 is detachably connected to the delivery pump 5. The delivery pump 5 can be a centrifugal pump or the like, and a servo motor 12 can provide power for it to transport the slurry. A liquid adding port can also be provided on the slurry tank 6 for supplementing the fissure similar material slurry.

[0050] The bottom of the mold 1 has a liquid outlet, and a screen for blocking the leakage of the above-mentioned aggregate is provided in the liquid outlet. The return pipe 7 is rotatably connected to the liquid outlet after passing through the rotary table 2 with an annular structure from below, and the other end of the return pipe 7 is communicated with the slurry tank 6, so as to recover the fissure similar material slurry leaking from the liquid outlet when grouting into the mold 1, and can also discharge the gas in the mold 1 more fully, so that the fissure similar material slurry is fully distributed and filled into the mold 1, avoiding the problem that the residual gas in the mold 1 affects the simulation of the true state inside the fissured rock by the prepared rock similar material.

[0051] Reference Figure 4 , a funnel structure 11 is provided at the slurry inlet end of the return pipe 7, and its larger end is rotatably connected to the bottom end of the mold 1 and coaxially arranged with the liquid outlet. Specifically, an annular slider is provided at the edge of the larger end area of the funnel structure 11, and the slider is embedded in the annular guide rail provided at the bottom of the mold 1, so that the rotation of the mold 1 does not affect the return pipe 7. The other end of the return pipe 7 is communicated with the inlet at the top of the slurry tank 6.

[0052] During use, first turn on the delivery pump 5 to inject the fissure similar material slurry (as shown in Example 1) in the slurry tank 6 into the mold 1 filled with aggregate (as shown in Example 1) through the rotary joint 4, and a release agent is coated on its inner wall. At the same time, drive the mold 1 to rotate so that the fissure similar material slurry in the mold 1 is more evenly distributed, improving the quality of the prepared cracked rock similar material. As the injected slurry increases, the excess slurry is discharged from the liquid outlet at the bottom of the mold 1 under the action of the grouting pressure and then enters the slurry tank 6 for recycling. When the flow rate indication at the slurry injection end of the mold 1 is less than the set value (such as 4m 3 / h, 5m 3 / h, 6m 3Stop grouting when it reaches (such as / h). For this purpose, a flow monitoring element 8 can be provided on the grouting pipeline between the rotary joint 4 and the delivery pump 5. At the same time, the flow monitoring element 8 is connected to a control system, and this control system is connected to the delivery pump 5 to control the grouting flow rate of the delivery pump 5 to ensure that the above-mentioned slurry injection value is met.

[0053] After completing the above grouting work, remove the flange 9 of the mold 1 from the annular tray 10, then quickly cover the bottom of the mold 1 with a sealed bottom cover to prevent the slurry from flowing out. Then, after removing the cover 3 from the mold 1, transfer the mold 1 together with the materials therein to a curing box for standard curing. After curing to a predetermined age (1 - 2 days), demold to obtain the fractured rock mass similar material. The preparation device of the above-mentioned fractured rock mass similar material in this embodiment realizes the implementation of the above-mentioned fractured rock mass similar material process, filling the gap in the actual preparation of cracked rock similar materials.

[0054] Finally, it should be noted that any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention. Although the specific implementation manners of the present invention are described above in conjunction with the accompanying drawings, it is not a limitation to the protection scope of the present invention. Those skilled in the art should understand that based on the technical solutions of the present invention, various modifications or deformations that can be made by those skilled in the art without creative efforts are still within the protection scope of the present invention.

Claims

1. A method for preparing similar materials of fractured rock mass for simulation analysis, characterized in that: The steps include: (S1) Obtain the compressive strength and permeability data of the rock in the fracture zone of the project site through in-situ testing, and then calculate the similarity parameters required for the simulation test based on these data and similarity criteria, and configure the slurry and aggregate required for the preparation of similar materials in the fracture zone based on these parameters; (S2) filling the aggregate of step (S1) into a mold until the mold is filled in a natural stacking state, and then pumping the slurry of step (S1) into the mold until the mold is filled, and curing and demoulding after completion to obtain a similar crack specimen; using the same method to prepare similar crack specimens under different pumping parameters for later use; (S3) testing the compressive strength and permeability of each of the similar fracture specimens obtained in step (S2), and then comparing them with the similar parameters of step (S1) after calculation using a similarity criterion, and taking the pumping parameters of the similar fracture specimen closest to the similar parameters as the optimal pumping parameters for standby use; (S4) configuring similar materials of the base rock of the engineering site in step (S1) according to similarity criteria, and then laying the material in a model box of a physical simulation test; then injecting the slurry configured in step (S1) into the model box using the optimal pumping parameters of step (S3) until it is full, and after completion, performing curing and demoulding to obtain similar materials of the fractured rock mass.

2. The method for preparing similar materials of fractured rock mass for simulation analysis according to claim 1, characterized in that: In step (S1), the slurry includes cement binder and water, and the method for determining the slurry and aggregate is: the slurry and aggregate are mixed evenly to form a cement-based material, which is poured into a mold, hardened and demolded, and then standardly cured for 24 to 36 hours to obtain a test piece; then the ratio of the cement binder, water and aggregate, and the aggregate particle size are changed, and the test pieces are prepared by the above method, and the compressive strength and permeability of these test pieces are tested. If the difference between the test results and the compressive strength and permeability in the similar parameters of step (S1) is within 2%, the corresponding cement binder and water can be used as the slurry of step (S1), and the corresponding aggregate can be used as the aggregate of step (S1).

3. The method for preparing similar materials of fractured rock mass for simulation analysis according to claim 1, characterized in that: In step (S2), the top port of the mold is sealed and then the slurry is injected until the slurry injection flow rate is less than a set value and the slurry injection is stopped.

4. The method for preparing similar materials of fractured rock mass for simulation analysis according to claim 3, characterized in that: The setting value is 4~6m 3 / h.

5. The method for preparing similar materials of fractured rock mass for simulation analysis according to claim 1, characterized in that: In step (S2), the inner surface of the mold is coated with a release agent.

6. The method for preparing similar materials of fractured rock mass for simulation analysis according to claim 1, characterized in that: In step (S4), the inner surface of the mold box is also coated with a release agent.

7. The method for preparing similar materials of fractured rock mass for simulation analysis according to claim 1, characterized in that: In steps (S2) and (S4), the curing time is 1 to 2 days.

8. The method for preparing similar materials of fractured rock mass for simulation analysis according to claim 3, characterized in that: In step (S2), the pumping parameters include pumping frequency and pumping time.

9. The method for preparing similar materials of fractured rock mass for simulation analysis according to any one of claims 1 to 8, characterized in that: In step (S4), the similar materials of the base rock at the engineering site include the following components: quartz sand, cement, barite powder, talcum powder, silicone oil and water.

10. A device for preparing similar materials of fractured rock mass for simulation analysis, characterized in that: include: A mold, a rotating table, a cover body, a rotating joint, a delivery pump, a slurry tank and a return pipe; wherein: the mold is detachably fixedly connected to the rotating table; the cover body is detachably covered on the top opening of the mold, the rotating joint is rotatably connected to the grouting port on the cover body, and the rotating joint, the delivery pump and the slurry tank are connected in sequence; the bottom liquid outlet of the mold is rotatably connected to the return pipe, the other end of the return pipe is connected to the slurry tank, and a screen is provided in the liquid outlet for blocking the aggregate in the preparation method described in any one of claims 1 to 6.

11. The device for preparing similar materials of fractured rock mass for simulation analysis according to claim 10, characterized in that: A flow monitoring element is provided on the grouting pipeline between the rotary joint and the delivery pump; the flow monitoring element is connected to a control system, and the control system is connected to the delivery pump.

12. The device for preparing similar materials of fractured rock mass for simulation analysis according to claim 10, characterized in that: The rotating platform is an annular structure, and the liquid return pipe passes through the annular structure and is rotatably connected to the bottom liquid outlet of the mold.

13. The device for preparing similar materials of fractured rock mass for simulation analysis according to claim 10, characterized in that: A flange is fixed on the lower side wall of the mold, and an annular tray is fixed on the upper surface of the rotating table. The flange and the annular tray are detachably connected via fasteners, and the bottom surface of the mold is in a suspended state.

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