Rock mass direct shear sample preparation device capable of changing dip angle of rock bridge

Abstract

The utility model discloses a rock mass direct shear sample preparation device capable of changing the dip angle of a rock bridge, which comprises a bottom plate, a grouting component arranged on the plate surface of the bottom plate and guard plate components arranged on the plate surface of the bottom plate, the grouting component is arranged between the guard plate components, the plate surface of the bottom plate is connected with a panel unit, and the panel unit is arranged between the guard plate components. The side wall of the panel unit is connected with a rotary clamping groove. According to the utility model, the influence of cracks on the shear strength of rocks is considered, secondly, by designing the rotary clamping grooves, not only can the dip angle change of the cracks be considered, but also the dip angle change of a rock bridge between the two cracks can be considered, so that one mold has multiple purposes, the manufacturing cost of the mold is saved, and finally, by arranging the grouting holes in the bottom plate, the production efficiency is improved. The injection mode of the cement slurry is changed, the generation of bubbles in the sample preparation process is reduced, and the uniformity of the sample is improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of direct shear test preparation device, specifically relating to a rock mass direct shear sample preparation device that can change the rock bridge dip angle. Background Technology

[0002] The distribution characteristics of fractures significantly affect the shear strength of rock masses. Compared to triaxial shear tests, direct shear tests offer advantages such as simplicity and ease of operation in determining rock cohesion and internal friction angles. However, firstly, existing direct shear tests primarily focus on intact rock, neglecting the influence of fractures on shear strength, resulting in incomplete consideration of these factors. Secondly, existing fractured rock sample molds exhibit limited fracture morphology and low mold utilization. Finally, according to relevant specifications, direct shear tests require relatively large cubic specimens, and traditional sample preparation methods result in numerous pores within the direct shear specimens, leading to significant specimen dispersion. Utility Model Content

[0003] The purpose of this invention is to provide a rock mass direct shear sample preparation device that can change the rock bridge dip angle, thus solving the problem that the influence of the rock fracture and the rock bridge dip angle between fractures on the rock shear strength is ignored in the existing direct shear test.

[0004] The technical solution adopted by this utility model is a rock mass direct shear sample preparation device that can change the rock bridge inclination angle, including a base plate, a grouting assembly on the surface of the base plate, a guard plate assembly on the surface of the base plate, the grouting assembly being arranged between the guard plate assemblies, a panel unit connected to the surface of the base plate, the panel unit being arranged between the guard plate assemblies, and a rotating slot connected to the side wall of the panel unit.

[0005] The features of this utility model also include:

[0006] The grouting assembly includes grouting holes, which are located in the middle of the base plate and are positioned between the protective plate assemblies.

[0007] The base plate has a side length of 200mm and a thickness of 15mm. The base plate has a slot along its circumference, and the panel unit matches the slot.

[0008] The diameter of the grouting hole is 20mm, and the depth of the groove is 5mm.

[0009] The protective plate assembly includes four bottom protective plates, each with two beveled sides. The beveled sides of two adjacent protective plates are joined at a right angle. Grouting holes are located between the four bottom protective plates. The four bottom protective plates are adhered to the surface of the base plate, and slots are located between the four bottom protective plates.

[0010] The panel unit includes two oppositely arranged panels. Each of the two opposite sides of the panels has two grooves along its height direction. The two grooves are respectively located near the two sides of the panels. A side plate is connected between the opposite grooves of the two panels. Each side plate has a rotating slot connected to its surface. The panels and side plates are locked into the slots one by one.

[0011] Both sides of the side panel are connected with protrusions along their height direction, and the protrusions match the grooves.

[0012] The rotating slot includes a disc, the edge of which is evenly provided with several protrusions along its circumference, and the disc is provided with slits. The disc is engaged with the side wall of the side plate.

[0013] The disc has a diameter of 40mm, the angle between adjacent protrusions is 30°, the height of each protrusion is 4mm, the length of the crack is 38mm, and the width is 2mm.

[0014] The beneficial effects of this utility model are:

[0015] This utility model discloses a rock mass direct shear sample preparation device with adjustable rock bridge inclination angle. It takes into account the influence of fractures on the shear strength of rock. Secondly, by designing a rotating slot, it can not only consider the change of the fracture's own inclination angle, but also the change of the rock bridge inclination angle between two fractures, realizing multiple uses of one mold and saving mold manufacturing costs. Finally, by setting grouting holes in the bottom plate, the method of cement grout injection is changed, reducing the generation of air bubbles during sample preparation and improving the uniformity of the sample. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the rock mass direct shear sample preparation device with adjustable rock bridge inclination angle according to this utility model.

[0017] Figure 2 This is a top view of the rock mass direct shear sample preparation device with adjustable rock bridge inclination angle according to this utility model;

[0018] Figure 3 This is a schematic diagram of the bottom plate structure in the rock mass direct shear sample preparation device with adjustable rock bridge inclination angle according to this utility model.

[0019] Figure 4 This is a schematic diagram of the panel structure in the rock mass direct shear sample preparation device with adjustable rock bridge inclination angle according to this utility model.

[0020] Figure 5 This is a top view of the panel in the rock mass direct shear sample preparation device with adjustable rock bridge inclination angle according to this utility model.

[0021] Figure 6 This is a schematic diagram of the side plate in the rock mass direct shear sample preparation device with adjustable rock bridge inclination angle according to this utility model.

[0022] Figure 7 This is a top view of the side plate in the rock mass direct shear sample preparation device with adjustable rock bridge inclination angle according to this utility model.

[0023] Figure 8 This is a schematic diagram of the rotating slot structure in the rock mass direct shear sample preparation device that can change the rock bridge inclination angle according to this utility model.

[0024] In the diagram, 1. base plate, 2. rotating slot, 3. grouting hole, 4. slot, 5. bottom guard plate, 6. panel, 7. groove, 8. side plate, 9. protrusion, 10. disc, 11. protrusion, 12. crack. Detailed Implementation

[0025] The technical solutions in the embodiments of this application will now be described in conjunction with the accompanying drawings.

[0026] This invention provides a rock mass direct shear sample preparation device that can change the dip angle of the rock bridge, such as... Figure 1-2 As shown, the device includes a base plate 1, with grouting components and protective plate components on its surface. The grouting components are positioned between the protective plate components. A panel unit is connected to the surface of the base plate 1, and the panel unit is positioned between the protective plate components. A rotating groove 2 is connected to the side wall of the panel unit. The device is made of 15mm thick transparent plexiglass. During sample preparation, the entire device is erected, and oil is applied to the inner sides of the protective plate components, panel units, and base plate 1 to facilitate demolding. The rotating groove 2 is installed according to the preset rock bridge inclination angle. Copper sheets are inserted into the cracks 12 of the rotating groove 2, and grout is injected into the device through the grouting components. Then, the grouting components are sealed and compacted by vibration. After curing, the device is demolded.

[0027] Example 1

[0028] A rock mass direct shear sample preparation device that can change the rock bridge dip angle includes a base plate 1, a grouting assembly on the surface of the base plate 1, a guard plate assembly on the surface of the base plate 1, the grouting assembly being arranged between the guard plate assemblies, a panel unit connected to the surface of the base plate 1, the panel unit being arranged between the guard plate assemblies, and a rotating slot 2 connected to the side wall of the panel unit.

[0029] The grouting assembly includes grouting holes 3, which are located in the middle of the base plate 1 and are positioned between the protective plate assemblies. Grout is injected into the device through the grouting holes 3, which can reduce the occurrence of air bubbles during sample preparation. Since the cement grout is very thick, the grouting holes 3 can be sealed with tape or cardboard after grouting is completed, and there will be no grout leakage.

[0030] Example 2

[0031] A rock mass direct shear sample preparation device that can change the rock bridge dip angle includes a base plate 1, a grouting assembly on the surface of the base plate 1, a guard plate assembly on the surface of the base plate 1, the grouting assembly being arranged between the guard plate assemblies, a panel unit connected to the surface of the base plate 1, the panel unit being arranged between the guard plate assemblies, and a rotating slot 2 connected to the side wall of the panel unit.

[0032] The grouting assembly includes grouting holes 3, which are located in the middle of the bottom plate 1 and are positioned between the protective plate assemblies.

[0033] like Figure 3 As shown, the base plate 1 has a side length of 200mm and a thickness of 15mm. The surface of the base plate 1 has slots 4 along its circumference, and the panel unit matches the slots 4. The base plate 1 is a square glass plate, and the slots 4 are set one by one near each side of the base plate 1. The panel unit is inserted into the slots 4 for easy assembly and disassembly.

[0034] The diameter of the grouting hole 3 is 20mm, and the depth of the slot 4 is 5mm. The depth of the grouting hole 3 is set to 5mm to secure the panel unit and prevent it from tipping over.

[0035] Example 3

[0036] A rock mass direct shear sample preparation device that can change the rock bridge dip angle includes a base plate 1, a grouting assembly on the surface of the base plate 1, a guard plate assembly on the surface of the base plate 1, the grouting assembly being arranged between the guard plate assemblies, a panel unit connected to the surface of the base plate 1, the panel unit being arranged between the guard plate assemblies, and a rotating slot 2 connected to the side wall of the panel unit.

[0037] The grouting assembly includes grouting holes 3, which are located in the middle of the bottom plate 1 and are positioned between the protective plate assemblies.

[0038] The base plate 1 has a side length of 200mm and a thickness of 15mm. The base plate 1 has a slot 4 along its circumference, and the panel unit matches the slot 4.

[0039] The diameter of the grouting hole 3 is 20mm, and the depth of the groove 4 is 5mm.

[0040] The protective plate assembly includes four bottom protective plates 5, each with two beveled sides. The beveled sides of two adjacent protective plates 5 are joined at a right angle. Grouting holes 3 are located between the four bottom protective plates 5. The four bottom protective plates 5 are adhered to the surface of the base plate 1. A slot 4 is located between the four bottom protective plates 5. The two sides of the bottom protective plates 5 are wedge-shaped with a 45° chamfer. The wedge-shaped sides of two adjacent bottom protective plates 5 match each other. The inner diameter of the square frame formed by the four bottom protective plates 5 is the same as the outer diameter of the panel unit. After the four bottom protective plates are joined, the square frame is adhered to the base plate 1 to prevent deformation of the panel unit after connection, which could cause deformation of subsequent samples.

[0041] Example 4

[0042] A rock mass direct shear sample preparation device that can change the rock bridge dip angle includes a base plate 1, a grouting assembly on the surface of the base plate 1, a guard plate assembly on the surface of the base plate 1, the grouting assembly being arranged between the guard plate assemblies, a panel unit connected to the surface of the base plate 1, the panel unit being arranged between the guard plate assemblies, and a rotating slot 2 connected to the side wall of the panel unit.

[0043] The grouting assembly includes grouting holes 3, which are located in the middle of the bottom plate 1 and are positioned between the protective plate assemblies.

[0044] The base plate 1 has a side length of 200mm and a thickness of 15mm. The base plate 1 has a slot 4 along its circumference, and the panel unit matches the slot 4.

[0045] The diameter of the grouting hole 3 is 20mm, and the depth of the groove 4 is 5mm.

[0046] The protective plate assembly includes four bottom protective plates 5, each bottom protective plate 5 has two beveled sides, and the beveled sides of two adjacent protective plates 5 are spliced ​​at a right angle. Grouting holes 3 are set between the four bottom protective plates 5. The four bottom protective plates 5 are pasted to the surface of the base plate 1, and the slots 4 are set between the four bottom protective plates 5.

[0047] like Figure 4-5 As shown, the panel unit includes two oppositely arranged panels 6. Each of the two panels 6 has two grooves 7 along its height on one of its opposite sides. The two grooves 7 are located near the two sides of the panel 6. Side plates 8 connect between the opposite grooves 7 of the two panels 6. Each side plate 8 has a rotating slot 2 connected to its surface. The panels 6 and side plates 8 are fitted into the slots 4 in a one-to-one correspondence. The panels 6 and side plates 8 are made of the same material and have the same dimensions. The cavity after the panels 6 and side plates 8 are joined has dimensions of 150mm × 150mm × 150mm. The grooves 7 facilitate the insertion of the side plates 8, and the fitting together facilitates subsequent assembly and disassembly. The side plates 8 have holes of the same shape as the rotating slots 2, facilitating the insertion of the rotating slots 2. Each side plate 8 is connected to two rotating slots 2.

[0048] Example 5

[0049] A rock mass direct shear sample preparation device that can change the rock bridge dip angle includes a base plate 1, a grouting assembly on the surface of the base plate 1, a guard plate assembly on the surface of the base plate 1, the grouting assembly being arranged between the guard plate assemblies, a panel unit connected to the surface of the base plate 1, the panel unit being arranged between the guard plate assemblies, and a rotating slot 2 connected to the side wall of the panel unit.

[0050] The grouting assembly includes grouting holes 3, which are located in the middle of the bottom plate 1 and are positioned between the protective plate assemblies.

[0051] The base plate 1 has a side length of 200mm and a thickness of 15mm. The base plate 1 has a slot 4 along its circumference, and the panel unit matches the slot 4.

[0052] The diameter of the grouting hole 3 is 20mm, and the depth of the groove 4 is 5mm.

[0053] The protective plate assembly includes four bottom protective plates 5, each bottom protective plate 5 has two beveled sides, and the beveled sides of two adjacent protective plates 5 are spliced ​​at a right angle. Grouting holes 3 are set between the four bottom protective plates 5. The four bottom protective plates 5 are pasted to the surface of the base plate 1, and the slots 4 are set between the four bottom protective plates 5.

[0054] The panel unit includes two oppositely arranged panels 6. Two grooves 7 are formed on the opposite side of each panel 6 along its height direction. The two grooves 7 are respectively located near the two sides of the panel 6. A side plate 8 is connected between the opposite grooves 7 of the two panels 6. Each side plate 8 has a rotating slot 2 connected to its surface. The panel 6 and the side plate 8 are locked into the slot 4 in a one-to-one correspondence.

[0055] like Figure 6-7 As shown, protrusions 9 are connected to both opposite sides of the side panel 8 along its height direction, and the protrusions 9 match the grooves 7. The protrusions 9 are inserted into the grooves 7, so that the side panel 8 and the panel 6 are engaged. The outer diameter of the structure formed by the side panel 8 and the panel 6 is the same as the inner diameter of the square frame formed by the four bottom guard plates 5.

[0056] Example 6

[0057] A rock mass direct shear sample preparation device that can change the rock bridge dip angle includes a base plate 1, a grouting assembly on the surface of the base plate 1, a guard plate assembly on the surface of the base plate 1, the grouting assembly being arranged between the guard plate assemblies, a panel unit connected to the surface of the base plate 1, the panel unit being arranged between the guard plate assemblies, and a rotating slot 2 connected to the side wall of the panel unit.

[0058] The grouting assembly includes grouting holes 3, which are located in the middle of the bottom plate 1 and are positioned between the protective plate assemblies.

[0059] The base plate 1 has a side length of 200mm and a thickness of 15mm. The base plate 1 has a slot 4 along its circumference, and the panel unit matches the slot 4.

[0060] The diameter of the grouting hole 3 is 20mm, and the depth of the groove 4 is 5mm.

[0061] The protective plate assembly includes four bottom protective plates 5, each bottom protective plate 5 has two beveled sides, and the beveled sides of two adjacent protective plates 5 are spliced ​​at a right angle. Grouting holes 3 are set between the four bottom protective plates 5. The four bottom protective plates 5 are pasted to the surface of the base plate 1, and the slots 4 are set between the four bottom protective plates 5.

[0062] The panel unit includes two oppositely arranged panels 6. Two grooves 7 are formed on the opposite side of each panel 6 along its height direction. The two grooves 7 are respectively located near the two sides of the panel 6. A side plate 8 is connected between the opposite grooves 7 of the two panels 6. Each side plate 8 has a rotating slot 2 connected to its surface. The panel 6 and the side plate 8 are locked into the slot 4 in a one-to-one correspondence.

[0063] Both sides of the side plate 8 are connected with protrusions 9 along their height direction, and the protrusions 9 match the grooves 7.

[0064] like Figure 8 As shown, the rotating slot 2 includes a disk 10, with a plurality of protrusions 11 evenly distributed along its circumference on the edge of the disk 10. The disk also has slits 12, and the disk 10 engages with the side wall of the side plate 8. The disk 10 and the protrusions 11 on its edge engage with holes opened in the surface of the side plate 8.

[0065] The diameter of the disk 10 is 40mm, the included angle between adjacent protrusions 11 is 30°, the height of each protrusion 11 is 4mm, the length of the crack 12 is 38mm, and the width is 2mm.

[0066] The working principle of this utility model's rock mass direct shear sample preparation device with adjustable rock bridge dip angle is as follows:

[0067] After assembling the four bottom protective plates 5, glue them to the surface of the base plate 1 with hard adhesive. Apply oil to the inner surfaces of the two front panels 6 and the side panels 8 to facilitate subsequent demolding. Moisten the outer surfaces of the two front panels 6 and the side panels 8 to ensure a tight fit with the bottom protective plates 5 and prevent deformation of the bottom protective plates 5. Insert the rotating slot 2 into the hole in the side panel 8 according to the preset rock bridge inclination angle and in a specific direction. Then, engage the groove 7 of the front panel 6 with the protrusion 9 of the side panel 8. After assembly, insert it into the slot 4 and secure it with the square frame of the assembled bottom protective plates 5. The dimensions (length, width, height, and thickness) are 300mm, 38mm, and 1mm respectively. The copper sheet is coated with oil and then inserted into the crack 12. The width of the copper sheet is the same as the length of the crack 12. The connected device is erected, and cement mortar of the corresponding mass is injected from the grouting hole 3. It is vibrated to ensure compaction. After scraping off the surface slurry with a scraper, the compacted sample and the device are placed in a standard curing box for curing. The sample and the device are taken out after initial setting. After demolding and removing the embedded copper sheet, it is placed in a standard curing box for curing for 28 days. The cured sample is taken out and the upper and lower surfaces of the sample are polished smooth with a grinder. The non-parallelism error of the two ends of the sample is less than 0.05 mm, and the end face of the sample is perpendicular to the axis of the sample.

[0068] This utility model discloses a rock mass direct shear sample preparation device with adjustable rock bridge inclination angle. It takes into account the influence of fractures on the shear strength of rock. Secondly, by designing a rotating slot, it can not only consider the change of the fracture's own inclination angle, but also the change of the rock bridge inclination angle between two fractures, realizing multiple uses of one mold and saving mold manufacturing costs. Finally, by setting grouting holes in the bottom plate, the method of cement grout injection is changed, reducing the generation of air bubbles during sample preparation and improving the uniformity of the sample.

Claims

1. A rock mass direct shear sample preparation device capable of changing the dip angle of a rock bridge, characterized in that, Includes a base plate (1), the surface of the base plate (1) is provided with a grouting assembly, the surface of the base plate (1) is provided with a protective plate assembly, the grouting assembly is disposed between the protective plate assemblies, the surface of the base plate (1) is connected to a panel unit, the panel unit is disposed between the protective plate assemblies, and the side wall of the panel unit is connected to a rotating slot (2). The grouting assembly includes grouting holes (3), which are opened in the middle of the bottom plate (1) and are disposed between the protective plate assemblies; The guard plate assembly includes four bottom guard plates (5), each bottom guard plate (5) has two sides set as bevels, and the bevels of two adjacent guard plates (5) are spliced ​​at right angles. The grouting holes (3) are set between the four bottom guard plates (5). The four bottom guard plates (5) are pasted on the surface of the base plate (1). The slots (4) are set between the four bottom guard plates (5).

2. The rock mass direct shear sample preparation device with adjustable rock bridge dip angle according to claim 1, characterized in that, The base plate (1) has a side length of 200mm and a thickness of 15mm. The base plate (1) has a slot (4) along its circumference, and the panel unit matches the slot (4).

3. The rock mass direct shear sample preparation device with adjustable rock bridge dip angle according to claim 1, characterized in that, The diameter of the grouting hole (3) is 20 mm, and the depth of the groove (4) is 5 mm.

4. The rock mass direct shear sample preparation device with adjustable rock bridge dip angle according to claim 1, characterized in that, The panel unit includes two oppositely arranged panels (6). Two grooves (7) are formed on the opposite side of each of the two panels (6) along their height direction. The two grooves (7) are respectively arranged close to the two sides of the panel (6). A side plate (8) is connected between the opposite grooves (7) of the two panels (6). A rotating slot (2) is connected to the surface of each side plate (8). The panel (6) and the side plate (8) are locked in the slot (4) in a one-to-one correspondence.

5. The rock mass direct shear sample preparation device with adjustable rock bridge dip angle according to claim 4, characterized in that, The side plate (8) has protrusions (9) connected to both opposite sides along its height direction, and the protrusions (9) match the grooves (7).

6. The rock mass direct shear sample preparation device with adjustable rock bridge dip angle according to claim 4, characterized in that, The rotating slot (2) includes a disk (10), the edge of which is evenly provided with a number of protrusions (11) along its circumference, the disk is provided with a crack (12), and the disk (10) is engaged with the side wall of the side plate (8).

7. The rock mass direct shear sample preparation device with adjustable rock bridge dip angle according to claim 6, characterized in that, The diameter of the disk (10) is 40 mm, the included angle between adjacent protrusions (11) is 30°, the height of each protrusion (11) is 4 mm, the length of the crack (12) is 38 mm, and the width is 2 mm.

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