Sample preparation method of rock and soil sample

Abstract

The invention relates to the technical field of rock-soil indoor test sample preparation, in particular to a rock-soil sample preparation method. The preparation method of the rock-soil sample comprises the following steps: putting a first layer of sample material into a sample mold, extending a second surface of a force transfer structure into a cavity of the sample mold through a through opening of a first fixing structure, and applying external force to a first surface of the force transfer structure until the compactness of the first layer of sample material reaches a preset compactness, so as to obtain a second layer of sample material; obtaining a first sample layer, taking out the force transmission structure, placing a second layer of sample material above the first sample layer in the sample mold, continuing to extend the second surface of the force transmission structure into the cavity of the sample mold through the through opening of the first fixing structure, and applying an external force to the first surface of the force transmission structure, and obtaining the layered sample until the compactness of the second-layer sample material reaches the preset compactness. According to the sample preparation method of the rock-soil sample, the falling angle and force of the force transmission structure can be controlled, and the rock-soil sample with a flat inclined plane can be obtained.

Description

Technical Field

[0001] The present invention relates to the technical field of sample preparation for geotechnical indoor tests, and in particular to a method for preparing a geotechnical sample. Background Art

[0002] Rock and soil stratification is a common phenomenon in nature. It is widely found in slope engineering, tunnel engineering, mining engineering and other projects. Rock and soil are prone to damage at the interface of stratification, especially when encountering weak interlayers, which is more likely to cause engineering collapse, landslide and other engineering accidents. The experimental study of stratified rock and soil is an important research content in the field of geotechnical engineering. Its purpose is to deeply understand the physical, mechanical and engineering characteristics of stratified soil, so as to provide scientific and reliable technical support for various engineering construction.

[0003] In the research direction of layered rock and soil tests, inclined layered rock and soil specimens can more accurately simulate the stress state and deformation characteristics of rock and soil in actual engineering projects, providing a more reliable basis for engineering design and construction.

[0004] In the related art, when making soil samples with a certain inclination angle, a cylindrical metal inclined surface striking rod is used to make cylindrical soil samples. However, when making soil samples with a metal inclined surface striking rod, since both the soil sample and the striking rod are cylindrical, it is difficult to control the force and angle of each fall of the striking rod, resulting in the production of samples with uneven inclined surfaces and uneven compaction. Summary of the invention

[0005] The present disclosure is proposed in view of the above problems. The present disclosure provides a method for preparing a rock and soil sample, which can control the falling angle of a force transmission structure and obtain a rock and soil sample with a flat inclined surface.

[0006] According to one aspect of the present disclosure, a method for preparing a geotechnical sample is provided, which is applied to a sample preparation device including a force transmission structure, a sample mold, and a first fixing structure and a second fixing structure for fixing the sample mold, wherein the force transmission structure has a first surface and a second surface opposite to each other, the first surface is a plane, and the second surface is an inclined surface, and the geotechnical sample is a layered sample, and the sample preparation method at least includes:

[0007] A first layer of sample material is placed in the sample mold, and the second surface of the force transmission structure is extended into the cavity of the sample mold through the through opening of the first fixed structure, and an external force is applied to the first surface of the force transmission structure until the compactness of the first layer of sample material reaches a preset compactness, thereby obtaining a first sample layer, wherein the groove of the force transmission structure cooperates with the guide edge of the first fixed structure;

[0008] Take out the force transmission structure, place a second layer of sample material above the first sample layer in the sample mold, continue to extend the second surface of the force transmission structure into the cavity of the sample mold through the through opening of the first fixed structure, apply external force to the first surface of the force transmission structure until the compactness of the second layer of sample material reaches a preset compactness, and obtain a layered sample, wherein the groove of the force transmission structure cooperates with the guide edge of the first fixed structure.

[0009] In the technical solution provided in the embodiment of the present disclosure, first, the sample mold can be fixed between the first fixed structure and the second fixed structure, and the first layer of sample material can be added to the sample mold. Then, after the groove of the force transmission structure is matched with the guide edge of the first fixed structure, the force transmission structure falls along the guide edge through the through opening of the first fixed structure until the force transmission structure extends into the cavity of the sample mold. At this time, an external force is applied to the first surface of the force transmission structure until the compactness of the first sample material reaches a preset compactness, and the first sample layer can be obtained. Next, the force transmission structure is taken out, and the second layer of sample material is placed above the first sample layer in the sample mold. After the groove of the force transmission structure is matched with the guide edge of the first fixed structure again, the force transmission structure falls along the guide edge through the through opening of the first fixed structure until the force transmission structure extends into the cavity of the sample mold. At this time, an external force is applied to the first surface of the force transmission structure until the compactness of the first sample material reaches a preset compactness, and a layered sample can be obtained. Among them, since the inner diameter of the sample mold is the same as the diameter of the through opening, with the cooperation of the groove of the force transmission structure and the guide edge of the first fixed structure, the angle of each fall of the force transmission structure whose second surface is an inclined surface can be controlled, thereby effectively preventing the change of the inclined surface caused by the rotation of the force transmission structure when it falls, so that the inclined surface of each layer of the sample finally obtained is smoother, and further the layered rock and soil samples can be compacted more evenly. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The above and other purposes, features and advantages of the present disclosure will become more apparent by describing the embodiments of the present disclosure in more detail in conjunction with the accompanying drawings. The accompanying drawings are used to provide a further understanding of the embodiments of the present disclosure and constitute a part of the specification. Together with the embodiments of the present disclosure, they are used to explain the present disclosure and do not constitute a limitation of the present disclosure. In the accompanying drawings, the same reference numerals generally represent the same components or steps.

[0011] Figure 1 It is a schematic diagram of the explosion structure of the sample preparation device of the rock and soil sample according to the embodiment of the present disclosure;

[0012] Figure 2 is a schematic diagram of the assembly state of the sample preparation device for rock and soil samples according to an embodiment of the present disclosure;

[0013] Figure 3is a schematic structural diagram of a flat gasket according to an embodiment of the present disclosure;

[0014] Figure 4 is a schematic structural diagram of a gasket adsorbent according to an embodiment of the present disclosure;

[0015] Figure 5 is a schematic structural diagram of a sample intermediate layer according to an embodiment of the present disclosure;

[0016] Figure 6 It is a preparation flow chart of the sample preparation method of the rock and soil sample according to the embodiment of the present disclosure.

[0017] Reference numerals:

[0018] 100-force transmission structure, 100a-first surface, 100b-second surface, 110-groove, 200-sample mold, 210-three-petal mold, 220-reinforcement ring, 300-first fixed structure, 310-through opening, 320-guide edge, 400-second fixed structure, 410-non-through opening, 500-support rod, 600-reduction auxiliary part, 700-flat gasket, 800-gasket adsorption part. DETAILED DESCRIPTION

[0019] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present disclosure more clearly understood, the present disclosure is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present disclosure and are not used to limit the present disclosure.

[0020] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0021] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present disclosure, "multiple" means two or more, unless otherwise clearly and specifically defined. "Several" means one or more, unless otherwise clearly and specifically defined.

[0022] In the description of the present disclosure, it is necessary to understand that the directions or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present disclosure.

[0023] In the description of the present disclosure, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0024] Rock and soil stratification is a common phenomenon in nature. It is widely present in slope engineering, tunnel engineering, mining engineering and other projects. Rock and soil are prone to damage at the interface of stratification, especially when encountering weak interlayers, which is more likely to cause engineering collapse, landslide and other engineering accidents. The experimental research on stratified rock and soil is an important research content in the field of geotechnical engineering. Its purpose is to deeply understand the physical, mechanical and engineering properties of stratified soil, so as to provide scientific and reliable technical support for various engineering construction. In the direction of stratified rock and soil experimental research, inclined stratified rock and soil specimens can more accurately simulate the stress state and deformation characteristics of rock and soil in actual engineering, providing a more reliable basis for engineering design and construction.

[0025] However, due to the difficulty in sample preparation, current indoor tests on rock and soil mechanics mainly focus on mechanical tests on rock and soil samples in the same layer. There are few studies on indoor tests on the mechanics of layered rock and soil, and even fewer studies on the mechanical properties of soil samples with a certain inclination angle.

[0026] In the related art, when making soil samples with a certain inclination angle, a cylindrical metal inclined surface striking rod is used to make cylindrical soil samples. However, when making soil samples with a metal inclined surface striking rod, since both the soil sample and the striking rod are cylindrical, it is difficult to control the force and angle of each fall of the striking rod, resulting in the production of samples with uneven inclined surfaces and uneven compaction.

[0027] In view of the above problems, the embodiment of the present disclosure provides a method for preparing a rock and soil sample, which can obtain a rock and soil sample with a flat inclined surface and uniform compaction. The problem in the prior art that it is difficult to control the angle and force of the striking rod each time it falls or is lifted, resulting in the production of samples with uneven inclined surfaces and uneven compaction, is solved. It should be understood that the method for preparing a rock and soil sample of the embodiment of the present disclosure is applied to the device for preparing a rock and soil sample of the embodiment of the present disclosure.

[0028] Figure 1 The exploded structure diagram of the sample preparation device for rock and soil samples according to the embodiment of the present disclosure is shown. Figure 2 FIG. 1 is a schematic diagram showing the assembly state of the sample preparation device for rock and soil samples according to an embodiment of the present disclosure. Figure 1 and Figure 2 As shown, the sample preparation device of the geotechnical sample of the embodiment of the present disclosure includes: a force transmission structure 100, a sample mold 200, and a first fixed structure 300 and a second fixed structure 400 for fixing the sample mold 200. The force transmission structure 100 has a first surface 100a and a second surface 100b opposite to each other, the first surface 100a is a plane, and the second surface 100b is an inclined surface. The sample mold 200 has a cavity for accommodating the geotechnical sample. It should be understood that the shape of the force transmission structure 100 can be a cylinder, the first surface 100a of the force transmission structure 100 can be an upper surface, and the second surface 100b of the force transmission structure 100 can be a lower surface. The shape of the first fixed structure 300 and the second fixed structure 400 can be plate-shaped.

[0029] like Figure 1 As shown, the outer wall of the force transmission structure 100 has a plurality of grooves 110, the extension direction of the grooves 110 is the same as the axial direction of the force transmission structure 100, the first fixed structure 300 has a through opening 310, the inner wall of the first fixed structure 300 located at the through opening 310 has a plurality of guide edges 320 matching the grooves 110, and the inner diameter of the sample mold 200 is the same as the diameter of the through opening 310.

[0030] It is understandable that, since the second surface 100b of the force transmission structure 100 is an inclined surface, the multiple grooves 110 are of different lengths. The length of each groove 110 is the same as the length of the outer side wall of the force transmission structure 100 along the axial direction, so that before the force transmission structure 100 enters the sample mold through the through opening 310, the guide ribs 320 can be snapped into the grooves 110. The multiple guide ribs 320 can be arranged on two non-diagonal symmetry axes of the first fixing structure 300.

[0031] When the sample preparation device is in an assembled state, the sample mold 200 is located between the first fixing structure 300 and the second fixing structure 400, the force transmission structure 100 cooperates with the guide edge 320 through the groove 110, and the force transmission structure 100 extends into the cavity of the sample mold 200 through the through opening 310. The second surface 100b of the force transmission structure 100 is located in the cavity of the sample mold 200.

[0032] In specific implementation, first, the sample mold 200 can be fixed between the first fixed structure 300 and the second fixed structure 400, and the sample material can be added to the sample mold 200. Then, after the groove 110 of the force transmission structure 100 is matched with the guide edge 320 of the first fixed structure 300, the force transmission structure 100 falls along the guide edge 320 through the through opening 310 of the first fixed structure 300 until the force transmission structure 100 extends into the cavity of the sample mold 200. At this time, an external force is applied to the first surface 100a of the force transmission structure 100 until the compactness of the sample material reaches the preset compactness, and a geotechnical sample can be obtained. It should be understood that the preset compactness can be defined as the target compactness to be achieved by the geotechnical sample.

[0033] On this basis, with the cooperation of the groove 110 of the force transmission structure 100 and the guide edge 320 of the first fixed structure 300, the angle of each fall of the force transmission structure 100 can be controlled, thereby effectively preventing the change of the inclined surface caused by the rotation of the force transmission structure 100 when falling, so that the inclined surface of the final geotechnical sample is smoother. When making multiple layers of stratified geotechnical samples with the same inclination angle, the parallelism of the inclined surfaces of the multiple layers of geotechnical layers can be effectively guaranteed, and the stratified geotechnical samples can be compacted more evenly. In addition, since the inner diameter of the sample mold 200 is the same as the diameter of the through opening 310, the force transmission structure 100 can fit tightly with the sample mold 200 after entering the sample mold 200, and further when the force transmission structure 100 applies external force to the sample material, it can contact the cross section of the sample material as much as possible, so that the smoothness of the inclined surface of the final geotechnical sample is higher.

[0034] It can be understood that the above-mentioned geotechnical samples can be layered samples, and the number of layers of the layered samples can be multiple layers, for example: two layers, three layers, four layers, five layers... ten layers or more layers, which is not limited here and can be set according to actual conditions.

[0035] Exemplarily, the geotechnical samples include soil samples and rock samples. Regardless of whether the geotechnical samples are soil samples or rock samples, they can be made into flat geotechnical samples or layered geotechnical samples as needed. If the geotechnical samples are soil samples, the size of the soil samples can include soil samples with diameters of 39.1 mm, 61.8 mm, or 101 mm. If the geotechnical samples are rock samples, the size of the rock samples can include rock samples with diameters of 50 mm.

[0036] When the diameter of the soil sample is 39.1 mm, its height can be 80 mm. When the diameter of the soil sample is 61.8 mm, its height can be 125 mm. When the diameter of the soil sample is 101 mm, its height can be 200 mm. When the diameter of the rock sample is 50 mm, its height can be 100 mm.

[0037] In one example, the size of the groove 110 of the embodiment of the present disclosure matches the size of the guide rib 320. For example, the size of the guide rib 320 may be 3 mm long, 3 mm wide, and the height is the thickness of the first fixing structure 300. The size of the groove 110 may be 3.5 mm long and 3.5 mm wide.

[0038] Exemplarily, the exposed edge of the guide rib 320 may be chamfered so that the groove 110 of the force transmission structure 100 and the guide rib 320 can slide more conveniently when they cooperate with each other.

[0039] In one achievable manner, the sample preparation device of the embodiment of the present disclosure further includes a plurality of support rods 500, wherein the plurality of support rods 500 are located between the first fixed structure 300 and the second fixed structure 400, and each support rod 500 has a first end and a second end, the first end of each support rod 500 is threadedly connected to the first fixed structure 300, the second end of each support rod 500 is threadedly connected to the second fixed structure 400, and the first end of each support rod 500 extends out of the upper surface of the first fixed structure 300.

[0040] In specific implementation, a plurality of support rods 500 may be threadedly connected to the first fixing structure 300 and the second fixing structure 400 to support the first fixing structure 300 and the second fixing structure 400, so that the sample mold 200 may be fixed between the first fixing structure 300 and the second fixing structure 400.

[0041] On this basis, when it is necessary to adjust the distance between the first fixed structure 300 and the second fixed structure 400, the height between the support rod 500 and the first fixed structure 300 and the second fixed structure 400 can be adjusted using the thread at the first end of the support rod 500 until the height of the sample mold 200 between the first fixed structure 300 and the second fixed structure 400 is the same as the height of each support rod 500 between the first fixed structure 300 and the second fixed structure 400.

[0042] Exemplarily, both ends of the support rod 500 are threaded, the length of the thread at the second end is the same as the thickness of the second fixed structure 400, and the diameter of the thread at the second end is 2 mm smaller than the diameter of the support rod 500. During installation, a gasket is placed on the upper end of the thread, and the length of the thread at the first end is the thickness of the first fixed structure + 15 mm, that is, the length of the first end of the support rod 500 extending out of the upper surface of the first fixed structure 300 is 15 mm. During installation, a nut is installed on the upper end of the thread for fixation.

[0043] Under the action of the supporting rod 500 , the sample mold 200 can be clamped between the first fixing structure 300 and the second fixing structure 400 , which is convenient for subsequent sample preparation.

[0044] In one achievable manner, the second fixing structure 400 of the embodiment of the present disclosure has a non-through opening 410, which is used to fix the sample mold 200. When the diameter of the sample mold 200 is a preset diameter, the non-through opening 410 cooperates with the bottom of the sample mold 200.

[0045] Exemplarily, in order to make the sample preparation device of the geotechnical sample of the embodiment of the present disclosure suitable for making samples of different diameters, a non-through opening 410 can be opened on the second fixed structure 400, and the diameter of the non-through opening 410 is opened according to the preset diameter of the sample mold 200. It should be understood that the preset diameter of the sample mold 200 can be defined as the outer diameter of the sample mold required for the sample of the maximum size. That is: the diameter of the maximum diameter specimen + the wall thickness of the sample mold 200. In order to facilitate the removal or placement of the sample mold, the preset diameter of the sample mold 200 can be set to the diameter of the maximum diameter specimen + the wall thickness of the sample mold 200 + (1mm~2mm). The specific selection of the size to be added can be set according to the actual situation. The purpose is to fix the sample mold and also facilitate the removal of the sample mold.

[0046] In one example, the size of the sample mold of the embodiment of the present disclosure is determined by the size of the target sample. For example, if the target sample is a soil sample with a diameter of 39.1 mm and a height of 80 mm, the diameter of the sample mold 200 is: inner diameter 39.1 mm + wall thickness of the sample mold 200. If the target sample is a rock sample with a diameter of 50 mm and a height of 100 mm, the diameter of the sample mold 200 is: inner diameter 50 mm + wall thickness of the sample mold 200.

[0047] In a specific implementation, before use, the bottom of the sample mold 200 can be placed into the non-through opening 410 so that the sample mold 200 is fixed to the non-through opening 410 of the second fixing structure 400 .

[0048] In one example, when the diameter of the sample mold 200 is smaller than the preset diameter, the sample preparation device further includes a diameter reduction auxiliary member 600, which is located in the non-through opening 410 and has an opening that matches the bottom of the sample mold 200. It should be understood that the diameter reduction auxiliary member 600 may include a ring.

[0049] In specific implementation, the opening diameter of the required diameter reduction auxiliary component 600 can be determined according to the diameter of the sample mold 200, the adapted diameter reduction auxiliary component 600 is placed in the non-through opening 410, and then the sample mold 200 is placed in the opening of the diameter reduction auxiliary component 600.

[0050] In one achievable manner, if the geotechnical sample of the embodiment of the present disclosure is a soil sample, the sample preparation device further includes a compaction mechanism, and when the sample preparation device is in an assembled state, the compaction mechanism is located above the first surface of the force transmission structure 100. If the geotechnical sample is a rock sample, the sample preparation device further includes a compaction mechanism, and when the sample preparation device is in an assembled state, the compaction mechanism is located above the first surface of the force transmission structure 100.

[0051] In specific implementation, when the geotechnical sample is a soil sample, after the sample device is assembled, the soil sample is placed in the sample mold 200, and then the first surface of the force transmission structure 100 is hit by the compaction mechanism until the compaction of the soil sample reaches the preset compaction, and the soil sample can be obtained. When the geotechnical sample is a rock sample, after the sample device is assembled, the rock sample is placed in the sample mold 200, and then the first surface of the force transmission structure 100 is pressed by the compaction mechanism until the compaction of the rock sample reaches the preset compaction, and the rock sample can be obtained.

[0052] In an achievable manner, the sample preparation device of the embodiment of the present disclosure further includes a flat gasket 700, Figure 3 FIG. 2 shows a schematic diagram of the structure of a flat gasket according to an embodiment of the present disclosure. Figure 3 As shown, the flat gasket 700 has the same inclination direction as the second surface, and the outer wall of the flat gasket 700 is in contact with the inner wall of the sample mold 200. When the sample preparation device is in an assembled state, the flat gasket 700 is located between the second surface and the rock and soil sample.

[0053] In specific implementation, after placing a soil sample or a rock sample in the sample mold 200, the sample in the sample mold is initially leveled using a force transmission mechanism, and then the force transmission mechanism is removed. A flat gasket 700 having the same inclination direction as the inclined surface of the first fixed structure 300 is placed above the soil sample or the rock sample, and then the force transmission structure 100 is placed above the flat gasket, and then an external force is applied to the force transmission structure 100 using a compaction mechanism or a compaction mechanism. Since the inclination direction of the inclined surface of the flat gasket 700 is the same as that of the first fixed structure 300, and the problem of unevenness of the sample due to the groove position of the force transmission structure 100 being easily caused by applying an external force when the force transmission structure 100 is directly used to contact the sample can be avoided, thereby obtaining a soil sample or a rock sample with a better inclined surface flatness.

[0054] In order to facilitate the placement of the leveling gasket 700 on the stratified rock and soil layer with the inclined surface in the sample mold 200 , when placing the leveling gasket 700 , the leveling gasket 700 can be placed in the sample mold 200 while avoiding the guide edge 320 on the first fixed structure 300 .

[0055] The inclination of the second surface of the above-mentioned force transmission structure 100 is an acute angle, which can be determined according to actual needs. The position of the groove on the second inclined surface affects whether the flat gasket is easy to put into the sample mold 200. For example, when the number of grooves is 4 and the 4 grooves are evenly distributed in the circumference of the force transmission structure 100, when the symmetry axis of the elliptical inclined surface of the second surface and the diagonal of the quadrilateral formed by the connection of the 4 grooves have a certain angle, for example, 15° to 75°, it is convenient for the flat gasket 700 to avoid the guide edge 320 on the first fixed structure 300 and be placed in the stratified rock and soil layer with an inclined surface in the sample mold 200.

[0056] Exemplarily, the sample preparation device of the embodiment of the present disclosure further includes a gasket adsorbent 800, Figure 4 FIG. 2 shows a schematic diagram of the structure of the gasket adsorbent according to an embodiment of the present disclosure. Figure 4 As shown, the gasket adsorbing member 800 is used to suck out the flat gasket 700 after each layer of rock and soil sampling is completed in the sampling device.

[0057] For example, the material of the flat gasket 700 can be metal, the thickness can be 5mm, the gasket adsorbent 800 can be a magnet, the magnet has a hook on the upper surface and a flat surface on the lower surface, and a thin rope can be tied to the hook.

[0058] In one example, regardless of whether the geotechnical sample is a soil sample or a rock sample, the embodiment of the present disclosure can realize the production of soil layers or rock layers with different inclination angles and inclination directions on the upper and lower surfaces by adjusting the inclination angle and inclination direction of the second surface of the force transmission structure 100. For example, the upper surface or the lower surface of the middle layer of the sample can be a sample layer with one side inclined, or a sample layer with both the upper surface and the lower surface inclined. When both the upper surface and the lower surface are inclined, the inclination directions and inclination angles of the upper and lower surfaces can be different. Figure 5 A schematic diagram of the structure of a sample intermediate layer of an embodiment of the present disclosure is shown. Figure 5 As shown, the upper surface and the lower surface of the middle layer of the sample are both inclined surfaces, and the inclination direction and the inclination angle of the upper surface are different from those of the lower surface.

[0059] In specific implementation, after the first layer of the sample with the upper surface being inclined is manufactured, after the material of the sample middle layer is added, the inclination direction of the flat gasket 700 and the inclination angle and inclination direction of the second surface of the force transmission structure 100 can be adjusted, so as to obtain Figure 5 The middle layer of the specimen shown.

[0060] For example, Figure 1 and Figure 2As shown, the sample mold 200 of the embodiment of the present disclosure includes a three-piece mold 210 and a reinforcement ring 220. When the sample preparation device is in an assembled state, the reinforcement ring 220 is sleeved on the outer wall of the three-piece mold 210.

[0061] In one practicable manner, the height of the second surface 100b of the force transmission structure 100 of the embodiment of the present disclosure can be set to facilitate picking up without affecting the compaction and compaction of the first surface 100a.

[0062] In one example, the first fixing structure 300, the second fixing structure 400 and the sample mold 200 can be made of stainless steel or other metal materials. The force transmission structure 100 can be made of photosensitive digital material printed by 3D printing, or cut from acrylic material, or can be made of hard wood that is not easily deformed in order to save costs.

[0063] Figure 6 The preparation flow chart of the method for preparing a rock sample according to an embodiment of the present disclosure is shown as follows: Figure 6 As shown, it can be understood that the preparation method of the embodiment of the present disclosure is illustrated by taking two layers of stratified rock and soil as an example. The sample preparation method of the rock and soil sample of the embodiment of the present disclosure includes:

[0064] Step 601: Place a first layer of sample material in the sample mold, extend the second surface of the force transmission structure into the cavity of the sample mold through the through opening of the first fixed structure, apply external force to the first surface of the force transmission structure until the compactness of the first layer of sample material reaches a preset compactness, and obtain a first sample layer, wherein the groove of the force transmission structure cooperates with the guide edge of the first fixed structure.

[0065] Step 602: Take out the force transmission structure, place a second layer of sample material above the first sample layer in the sample mold, continue to extend the second surface of the force transmission structure into the cavity of the sample mold through the through opening of the first fixed structure, apply external force to the first surface of the force transmission structure until the compactness of the second layer of sample material reaches a preset compactness, and obtain a layered sample, wherein the groove of the force transmission structure cooperates with the guide edge of the first fixed structure.

[0066] Illustratively, the method for preparing geotechnical samples according to the embodiments of the present disclosure can also prepare multi-layered samples, not limited to two types.

[0067] Exemplarily, the first layer of sample material and the second layer of sample material may both include soil sample material and rock sample material. If the first layer of sample material and the second layer of sample material are soil sample materials, the method of applying external force to the force transmission structure is compaction; if the first layer of sample material and the second layer of sample material are rock sample materials, the method of applying external force to the force transmission structure is compaction.

[0068] In an achievable manner, before placing the first layer of sample material in the sample mold, the method of the disclosed embodiment further includes: if the first layer of sample material and the second layer of sample material are rock sample materials, forming a release agent on the inner wall of the sample mold. Fixing the bottom of the sample mold in the non-through opening of the second fixing structure.

[0069] In an optional manner, the embodiment of the present disclosure fixes the bottom of the sample mold in a non-through opening of the second fixing structure, including: when the diameter of the sample mold is equal to the preset diameter, the bottom of the sample mold is fixed in the non-through opening of the second fixing structure. When the diameter of the sample mold is less than the preset diameter, a diameter reduction auxiliary part is placed in the non-through opening, and the bottom of the sample mold is fixed in the opening of the diameter reduction auxiliary part.

[0070] Illustratively, the sampling method of geotechnical samples in the disclosed embodiment also includes: if the height of the sample mold is higher than a preset height, adjusting the height between the support rod and the first fixed structure and the second fixed structure using the thread at the first end of the support rod until the height of the sample mold between the first fixed structure and the second fixed structure is the same as the height of each support rod between the first fixed structure and the second fixed structure.

[0071] In one achievable manner, after the first sample material is placed in the sample mold, the embodiment of the present disclosure extends the second surface of the force transmission structure into the cavity of the sample mold through the through opening of the first fixed structure. Before applying external force to the force transmission structure, the method also includes: placing a flat gasket with the same inclination direction as the inclined surface of the first fixed structure above the first sample material.

[0072] In one achievable manner, after the second test layer sample material is placed in the sample mold, the embodiment of the present disclosure extends the second surface of the force transmission structure into the cavity of the sample mold through the through opening of the first fixed structure. Before applying external force to the force transmission structure, the method also includes: placing a flat gasket with the same inclination direction as the inclined surface of the first fixed structure above the second test layer sample material.

[0073] In an optional manner, after the first sample layer is obtained in the embodiment of the present disclosure, the method further includes: taking out the force transmission structure and sucking out the flat gasket using a gasket adsorbent.

[0074] Illustratively, after placing a first layer of sample material in the sample mold and after placing a second layer of sample material in the sample mold, the method further includes: inserting and compacting the first layer of sample material and inserting and compacting the second layer of sample material.

[0075] In one example, the method for preparing a geotechnical sample according to an embodiment of the present disclosure further includes: forming an anti-sticking material on the second surface of the force transmission structure.

[0076] Example

[0077] The method for preparing the test piece of the present invention is:

[0078] 1. Apply mold release agent to the φ50mm×100mm three-lobed mold, assemble and put on the reinforcement ring to tighten the three-lobed mold, place the bottom of the assembled and reinforced three-lobed mold in the non-through opening of the second fixed structure, screw the support rod on the second fixed structure, penetrate the first fixed structure on the support rod, place the first fixed structure on the upper part of the three-lobed mold, tighten the nut to fix the three-lobed mold between the first fixed structure and the second fixed structure. When reproducing, just loosen the nut on the first fixed structure, take out the three-lobed mold and put it between the first fixed structure and the second fixed structure, and the device does not need to be disassembled.

[0079] 2. If rock-like materials such as cement mortar or gypsum are used, the brittle rock-like materials are made by pouring fluid in the three-petal mold and then removing the mold for curing and hardening. First, calculate the mass of each layer of fluid to be loaded, the angle of the designed inclined surface, and the height h1 of the highest point of the inclined surface from the top surface of the specimen. Then pour a fluid material into the three-petal mold, use a thin rod to insert it to make it dense, use a force transmission structure to preliminarily shape the surface of the fluid, and then put a flat gasket into the preliminarily shaped surface of the three-petal mold. Then use a clean force transmission structure to manually press and compact the flat gasket, and control the degree of compaction by measuring the height of the exposed force transmission structure. Take out the force transmission structure, and suck the gasket with a magnet with a rope and take out the gasket. Then pour another fluid material, and pour, insert and compact, preliminarily shape, shape, and compact the different layers of fluid materials in turn. The top surface of the specimen can be compacted by manually pressing the cylinder with the upper surface of the force transmission structure. In addition, in order to prevent the force transmission structure and the bottom of the flat gasket from being adhered to the fluid material, tape can be pasted on its bottom. The prepared specimens are cured, demolded, and cured in the curing box according to the material demolding time and the curing time required for the research to complete the specimen production.

[0080] 3. If the rock sample is pressed by using barite powder, quartz sand, iron ore concentrate and rosin alcohol solution as the proportioning materials, first design the layers, calculate the mass and volume of the materials with different proportions, pour one proportioning material into the three-petal mold, use the force transmission structure to perform preliminary shaping, put in the flat gasket, and then use the clean force transmission structure to compact and shape on the flat gasket. The compaction is carried out slowly by controlling the displacement using a press, and the pressurization is ended by controlling the displacement of the press. The press is left standing for 10 minutes without unloading, unloaded, and the flat gasket is taken out. The surface of the material is roughened, and the second proportioning soil sample is added. The entire specimen is completed according to the layered design, and the three-petal mold is taken out and the specimen is completed after demolding.

[0081] 4. When preparing soil samples, according to the designed stratification and calculated mass of different soil layers, the samples are made by repeatedly loading different soils, preliminarily shaping the inclined surface, and finally compacting the layers. Unlike 2 and 3, there is no need to apply a release agent or maintain the samples. When compacting, a compactor is used. The degree of compaction is controlled by controlling the number of drops of the compacting hammer and the height of the exposed force transmission structure.

[0082] In summary, the sample preparation device for rock and soil samples of the disclosed embodiment fixes the sample mold through the first fixed structure and the second fixed structure, and at the same time, a guide edge is provided on the opening wall penetrating the center of the first fixed structure and matches the guide groove provided on the force transmission structure, thereby ensuring that the inclined surface of the stratified rock and soil body maintains a fixed inclination angle during the manufacturing test process. While keeping the position of the guide groove of the force transmission structure unchanged, by manufacturing the force transmission structure with inclined surfaces of different inclination angles and inclination directions, the precise manufacturing of stratified rock and soil bodies with complex inclined surfaces can be achieved. Furthermore, a better compaction effect can be achieved by the inclined flat gasket and the inclined surface below the force transmission structure with grooves and inclined surfaces.

[0083] On this basis, by designing that rings of different sizes can be placed in the non-through opening in the center of the second fixed structure, a design and manufacturing method of a multiple diameter combination device is given, so that a device can be used to manufacture layered rock and soil specimens of different diameters. At the same time, a sample preparation method for rock and soil samples is designed. According to different sample preparation materials, the device can be used in conjunction with different compaction methods such as presses, compactors or manual methods to achieve the preparation of layered specimens of rock-like materials and soil.

[0084] The basic principles of the present disclosure are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present disclosure are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present disclosure. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, and are not limitations. The above details do not limit the present disclosure to the necessity of adopting the above specific details to be implemented.

[0085] The block diagrams of the devices, apparatuses, equipment, and systems involved in the present disclosure are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagrams. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The word "such as" used here refers to the phrase "such as but not limited to", and can be used interchangeably with it.

[0086] Additionally, as used herein, "or" used in a list of items beginning with "at least one" indicates a separate list, so that, for example, a list of "at least one of A, B, or C" means A or B or C, or AB or AC or BC, or ABC (i.e., A and B and C). Furthermore, the word "exemplary" does not mean that the example described is preferred or better than other examples.

[0087] It should also be noted that in the system and method of the present disclosure, each component or each step can be decomposed and / or recombined. Such decomposition and / or recombination should be regarded as equivalent solutions of the present disclosure.

[0088] Various changes, substitutions, and modifications of the techniques described herein may be made without departing from the teachings defined by the appended claims. Furthermore, the scope of the claims of the present disclosure is not limited to the specific aspects of the processes, machines, manufactures, compositions of events, means, methods, and actions described above. Currently existing or later to be developed processes, machines, manufactures, compositions of events, means, methods, or actions that perform substantially the same functions or achieve substantially the same results as the corresponding aspects described herein may be utilized. Thus, the appended claims include such processes, machines, manufactures, compositions of events, means, methods, or actions within their scope.

[0089] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present disclosure. Therefore, the present disclosure is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0090] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present disclosure to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A method for preparing a rock and soil sample, characterized in that: The invention is applied to a sample preparation device including a force transmission structure, a sample mold, and a first fixing structure and a second fixing structure for fixing the sample mold, wherein the force transmission structure has a first surface and a second surface opposite to each other, the first surface is a plane, and the second surface is an inclined surface, and the rock and soil sample is a layered sample. The sample preparation method at least includes: A first layer of sample material is placed in the sample mold, and the second surface of the force transmission structure is extended into the cavity of the sample mold through the through opening of the first fixed structure, and an external force is applied to the first surface of the force transmission structure until the compactness of the first layer of sample material reaches a preset compactness, thereby obtaining a first sample layer, wherein the groove of the force transmission structure cooperates with the guide edge of the first fixed structure; Take out the force transmission structure, place a second layer of sample material above the first sample layer in the sample mold, continue to extend the second surface of the force transmission structure into the cavity of the sample mold through the through opening of the first fixed structure, apply external force to the first surface of the force transmission structure until the compactness of the second layer of sample material reaches a preset compactness, and obtain a layered sample, wherein the groove of the force transmission structure cooperates with the guide edge of the first fixed structure.

2. The method for preparing rock and soil samples according to claim 1, characterized in that: The first layer of sample material and the second layer of sample material include soil sample material and rock sample material. If the first layer of sample material and the second layer of sample material are soil sample materials, the method of applying external force to the force transmission structure is compaction. If the first layer of sample material and the second layer of sample material are rock sample materials, the method of applying external force to the force transmission structure is compaction.

3. The method for preparing rock and soil samples according to claim 2, characterized in that: Before placing the first layer of sample material in the sample mold, the method further comprises: If the first layer of sample material and the second layer of sample material are rock sample materials, forming a release agent on the inner wall of the sample mold; The bottom of the sample mold is fixed in the non-through opening of the second fixing structure.

4. The method for preparing rock and soil samples according to claim 3, characterized in that: The step of fixing the bottom of the sample mold in the non-through opening of the second fixing structure comprises: When the diameter of the sample mold is equal to the preset diameter, fixing the bottom of the sample mold in the non-through opening of the second fixing structure; When the diameter of the sample mold is smaller than the preset diameter, a diameter reduction auxiliary piece is placed in the non-through opening, and the bottom of the sample mold is fixed in the opening of the diameter reduction auxiliary piece.

5. The method for preparing rock and soil samples according to claim 1, characterized in that: The method further comprises: If the height of the sample mold is higher than the preset height, the height between the support rod and the first fixed structure and the second fixed structure is adjusted using the thread at the first end of the support rod until the height of the sample mold between the first fixed structure and the second fixed structure is the same as the height of each support rod between the first fixed structure and the second fixed structure.

6. The method for preparing rock and soil samples according to claim 1, characterized in that: After the first sample material is placed in the sample mold, the second surface of the force transmission structure is extended into the cavity of the sample mold through the through opening of the first fixing structure. Before applying external force to the force transmission structure, the method further includes: A flat gasket having the same inclination direction as the second surface of the force transmission structure is placed above the first sample material.

7. The method for preparing rock and soil samples according to claim 1, characterized in that: After the second test layer sample material is placed in the sample mold, the second surface of the force transmission structure is extended into the cavity of the sample mold through the through opening of the first fixing structure. Before applying external force to the force transmission structure, the method further includes: A flat gasket having the same inclination direction as the second surface of the force transmission structure is placed above the second test layer sample material.

8. The method for preparing rock and soil samples according to claim 6 or 7, characterized in that: After obtaining each sample layer, the method further comprises: Take out the force transmission structure and use the gasket suction piece to suck out the flat gasket.

9. The method for preparing a rock sample according to any one of claims 1 to 7, characterized in that: After placing the first layer of sample material in the sample mold and after placing the second layer of sample material in the sample mold, the method further includes: The first layer of sample material is cut and compacted, and the second layer of sample material is cut and compacted.

10. The method for preparing a rock sample according to any one of claims 1 to 7, characterized in that: The method further comprises: A release material is formed on the second surface of the force transmission structure.

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