Fractured rock mass hollow cylinder torsional shear sample preparation mold

Abstract

The utility model discloses a fractured rock mass hollow cylinder torsional shear sample preparation mold which comprises a bottom plate, a circular groove and an annular groove are formed in the bottom plate, the inner diameter of the annular groove is larger than the diameter of the circular groove, an outer side panel is arranged in the annular groove, a bottom support and an inner side panel are arranged in the circular groove, and the inner side panel is connected to the outer portion of the bottom support in a sleeving mode; the top support comprises a cylindrical part and an extension part which are connected with each other, the cylindrical part is embedded in an inner cavity of the inner side panel, the extension part is provided with a clamping part along the end part deviating from the cylindrical part, and the clamping part is clamped with the outer side panel; and the copper sheet penetrates through the outer side panel and the inner side panel. The cracks are formed in the outer side panel and the inner side panel, the copper sheets penetrate through the cracks, and the cracks are formed in the pouring process by inserting the copper sheets, so that the cracks are formed in the hollow cylinder of the fractured rock mass, and the technical problem that the cracks are difficult to consider due to the fact that holes are formed in the center of a sample in traditional sample preparation is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of sample making moulds and relates to a sample making mould for a hollow cylindrical torsion shear test specimen of a fractured rock mass. Background Art

[0002] The hollow cylinder torsion shear test can apply torque while applying pressure, and realize the study of the stress state of the specimen under the condition of simultaneous change of the "surrounding rock-stress principal axis". Compared with the traditional triaxial shear test, the hollow cylinder torsion shear test can more accurately simulate the stress state of the surrounding rock in actual engineering, and therefore has attracted extensive attention from geotechnical engineering researchers.

[0003] In the past, the preparation of hollow cylindrical torsion shear test specimens required first making a cylindrical rock specimen with a diameter of 50mm and a height of 110mm, and then opening a hole in the center of the specimen to form a hollow cylindrical specimen with an inner diameter of 30mm, an outer diameter of 50mm, and a height of 110mm. This method not only has a low sample success rate and is very likely to cause disturbance to the specimen during the sample preparation process, but more importantly, it is difficult to consider the influence of cracks, the most important factor affecting the mechanical properties of rock mass, on the results of hollow cylindrical torsion shear tests.

[0004] In view of this, the utility model proposes a sample preparation mold for hollow cylindrical torsion shear specimens of fractured rock mass, which not only simplifies the sample preparation process of hollow cylindrical torsion shear specimens, realizes the batch preparation of hollow cylindrical torsion shear specimens, reduces the disturbance in the sample preparation process, and ensures the uniformity of the specimens. In addition, the factor of fracture is taken into account in the sample preparation process, realizing the transformation from the preparation of hollow cylindrical torsion shear specimens of rock mass to the preparation of hollow cylindrical torsion shear specimens of rock mass, which facilitates the quantitative study of the influence of fractures on the results of hollow cylindrical torsion shear tests in the later stage. Utility Model Content

[0005] The utility model aims to provide a sample preparation mould for a hollow cylindrical torsion shear sample of a fractured rock mass, which solves the technical problem that it is difficult to consider the fractures in the traditional sample preparation because a hole is opened in the centre of the sample.

[0006] The technical scheme adopted by the utility model is that the sample preparation mold of the hollow cylindrical torsion shear specimen of fractured rock mass comprises a bottom plate, the bottom plate is provided with a circular groove and an annular groove, the inner diameter of the annular groove is larger than the diameter of the circular groove, an outer panel is provided in the annular groove, a bottom support and an inner panel are provided in the circular groove, and the inner panel is sleeved on the outside of the bottom support; it also comprises a top support, the top support comprises a cylindrical part and an extension part connected to each other, the cylindrical part is embedded in the inner cavity of the inner panel, the extension part is provided with a clamping part along the end part away from the cylindrical part, and the clamping part is clamped with the outer panel; it also comprises a copper sheet, and the copper sheet passes through the outer panel and the inner panel.

[0007] The utility model is also characterized in that:

[0008] The outer panel includes a first outer panel and a second outer panel. The cross-sections of the first outer panel and the second outer panel are both semicircular. The longitudinal sections of the first outer panel and the second outer panel are rectangular. The first outer panel and the second outer panel are abutted to form a hollow cylinder. The first outer panel and the second outer panel are both provided with a first crack on their semicircular walls.

[0009] Ear plates are connected to both sides of the opening ends of the first outer plate and the second outer plate, and ear holes are coaxially arranged on adjacent ear plates. The first outer plate and the second outer plate are connected by bolts passing through the coaxial ear holes.

[0010] The inner panel includes a top panel and a bottom panel. The top panel includes a plurality of top arc panels sleeved on the circumference of the top support, and the plurality of top arc panels abut against each other to form a circular ring. The bottom panel includes a plurality of bottom arc panels sleeved on the circumference of the bottom support, and the plurality of bottom arc panels abut against each other to form a circular ring. A second crack is formed between the plurality of top arc panels and the plurality of bottom arc panels, and the copper sheet penetrates through and abuts against the first crack and the second crack.

[0011] The ear plate is made of plexiglass.

[0012] The cylindrical portion of the top support and the outer wall of the bottom support are both coated with adsorbent, and the top panel and the bottom panel are connected via the adsorbent.

[0013] The cylindrical part of the top support and the bottom support are all made of organic glass rods, and the outer panel, the inner panel, the bottom plate, the extension part and the clamping part are all made of organic glass plates.

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

[0015] The utility model arranges cracks on the outer panel and the inner panel so that the copper sheet can penetrate through, and the cracks are formed during the pouring process by inserting the copper sheet, that is, cracks are formed inside the hollow cylinder of the fractured rock mass, thereby solving the technical problem that it is difficult to consider the cracks in the traditional sample preparation because a hole is opened in the center of the sample.

[0016] The utility model not only simplifies the sample preparation process of hollow cylindrical torsion shear specimens, realizes the batch preparation of hollow cylindrical torsion shear specimens, reduces the disturbance in the sample preparation process, and ensures the uniformity of the specimens. In addition, the factor of cracks is taken into account in the sample preparation process, and the transformation from the preparation of rock hollow cylindrical torsion shear specimens to the preparation of rock hollow cylindrical torsion shear specimens is realized, which facilitates the quantitative research on the influence of cracks on the results of hollow cylindrical torsion shear tests in the later stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a sample preparation mold for a hollow cylindrical torsion shear specimen of a fractured rock mass according to the utility model;

[0018] Figure 2 yes Figure 1A top view of

[0019] Figure 3 It is a structural schematic diagram of the first outer side plate in the sample preparation mold of the hollow cylindrical torsion shear specimen of fractured rock mass of the utility model;

[0020] Figure 4 yes Figure 3 A top view of

[0021] Figure 5 It is a structural schematic diagram of the second outer side plate in the sample preparation mold of the hollow cylindrical torsion shear specimen of fractured rock mass of the utility model;

[0022] Figure 6 yes Figure 5 A top view of

[0023] Figure 7 It is a structural schematic diagram of the inner panel in the sample preparation mold of the hollow cylindrical torsion shear specimen of fractured rock mass of the utility model;

[0024] Figure 8 yes Figure 7 The main view;

[0025] Fig. 9 yes Figure 7 A top view of

[0026] Fig.10 It is a structural schematic diagram of the top support in the sample preparation mold of the hollow cylindrical torsion shear specimen of fractured rock mass of the utility model;

[0027] Fig.11 yes Fig.10 A top view of

[0028] Fig.12 The utility model is a structural schematic diagram of a bottom plate in a sample preparation mould for a hollow cylindrical torsion shear specimen of a fractured rock mass.

[0029] In the figure, 1. outer panel, 101. first outer panel, 102. second outer panel, 2. inner panel, 201. top panel, 202. bottom panel, 3. bottom plate, 301. circular groove, 302. annular groove, 4. top support, 401. cylindrical part, 402. extension part, 403. clamping part, 5. bottom support, 6. ear plate, 601. ear hole, 7. copper sheet, 701. first crack, 702. second crack. DETAILED DESCRIPTION

[0030] The utility model is further explained below in conjunction with the accompanying drawings and specific implementation methods.

[0031] Example 1

[0032] like Figure 1 and Figure 2As shown, the utility model discloses a sample preparation mold for a hollow cylindrical torsional shear specimen of a fractured rock mass, comprising a bottom plate 3, on which a circular groove 301 and an annular groove 302 are provided, wherein the inner diameter of the annular groove 302 is larger than the diameter of the circular groove 301, an outer panel 1 is provided in the annular groove 302, a bottom support 5 and an inner panel 2 are provided in the circular groove 301, and the inner panel 2 is sleeved on the outside of the bottom support 5; further comprising a top support 4, the top support 4 comprises a cylindrical portion 401 and an extension portion 402 connected to each other, the cylindrical portion 401 is embedded in the inner cavity of the inner panel 2, the extension portion 402 is provided with a clamping portion 403 along the end away from the cylindrical portion 401, and the clamping portion 403 is clamped with the outer panel 1; further comprising a copper sheet 7, which passes through the outer panel 1 and the inner panel 2.

[0033] In the utility model, the outer panel 1 is fixed by setting an annular groove 302 on the bottom plate 3; the inner panel 2 is supported by the circular groove 301 and the bottom support 5 set on the bottom plate 3 in combination with the top support 4; the top support 4 is clamped with the outer panel 1 through the clamping part 403 to achieve mutual fixation; the position between the annular groove 302 and the circular groove 301 and between the outer panel 1 and the inner panel 2 is the position for manufacturing the hollow cylinder of the fractured rock mass; the inner diameter of the outer panel 1 and the outer diameter of the inner panel 2 are the outer diameter and inner diameter of the hollow cylinder of the fractured rock mass; the height is poured according to the actual size; by setting cracks on the outer panel 1 and the inner panel 2, the copper sheet 7 can pass through, and the copper sheet 7 is sealed and connected with the cracks; in the actual manufacturing process, the copper sheet 7 is inserted to form cracks during the pouring process, that is, the cracks are formed inside the hollow cylinder of the fractured rock mass; after the pouring is completed, the copper sheet 7 can be removed before demolding. The technical problem that it is difficult to consider the cracks in the traditional sample preparation due to the opening of the sample center is solved. The utility model not only simplifies the sample preparation process of hollow cylindrical torsion shear specimens, realizes the batch preparation of hollow cylindrical torsion shear specimens, reduces the disturbance in the sample preparation process, and ensures the uniformity of the specimens. In addition, the factor of cracks is taken into account in the sample preparation process, and the transformation from the preparation of rock hollow cylindrical torsion shear specimens to the preparation of rock hollow cylindrical torsion shear specimens is realized, which facilitates the quantitative research on the influence of cracks on the results of hollow cylindrical torsion shear tests in the later stage.

[0034] Example 2

[0035] On the basis of Example 1, Figure 3 and Figure 4 As shown, the outer panel 1 includes a first outer panel 101 and a second outer panel 102, the cross-sections of the first outer panel 101 and the second outer panel 102 are both semicircular, the longitudinal sections of the first outer panel 101 and the second outer panel 102 are rectangular, the first outer panel 101 and the second outer panel 102 are abutted to form a hollow cylinder, and the first outer panel 101 and the second outer panel 102 are both provided with a first crack 701 on the semicircular walls.

[0036] In this embodiment, the outer panel 1 is a plexiglass cylinder with an inner diameter of 50 mm, an outer diameter of 60 mm, a height of 120 mm, and a thickness of 5 mm, which is cut horizontally along the center line to form a first outer panel 101 and a second outer panel 102; the first outer panel 101 and the second outer panel 102 are respectively provided with a first crack 701 of a specific length and an inclination angle in the center part, and the first crack 701 is a non-through crack on the first outer panel 101 and the second outer panel 102, and the first outer panel 101 and the second outer panel 102 can be spliced ​​into a complete hollow cylinder.

[0037] Furthermore, ear plates 6 are connected to both sides of the opening ends of the first outer plate 101 and the second outer plate 102. The ear plates 6 are made of plexiglass plates. Adjacent ear plates 6 are coaxially provided with ear holes 601. The first outer plate 101 and the second outer plate 102 are connected by bolts passing through the coaxial ear holes 601.

[0038] In this embodiment, ear plates 6 are connected to the left and right sides of the first outer plate 101 and the second outer plate 102. The ear plates 6 are 5 mm away from the top end of the outer panel 1 and 15 mm away from the bottom end of the outer panel 1. The ear plates are organic glass plates with a height of 100 mm, a width of 20 mm, and a thickness of 5 mm. Ear holes 601 with a diameter of 5 mm are opened at corresponding positions on the ear plates 6 for inserting bolts later to connect the first outer plate 101 and the second outer plate 102 to form a whole.

[0039] Furthermore, the inner panel 2 includes a top panel 201 and a bottom panel 202, the top panel 201 includes a plurality of top arc panels sleeved on the circumference of the top support 4, and the plurality of top arc panels abut against each other to form a circular ring; the bottom panel 202 includes a plurality of bottom arc panels sleeved on the circumference of the bottom support 5, and the plurality of bottom arc panels abut against each other to form a circular ring; a second crack 702 is formed between the plurality of top arc panels and the plurality of bottom arc panels, and the copper sheet 7 penetrates through and abuts against the first crack 701 and the second crack 702.

[0040] In this embodiment, the top panel 201 includes four top curved panels, and the bottom panel 202 includes four bottom curved panels, but is not limited to eight curved panels. The top curved panels and the bottom curved panels are organic glass cylinders with an inner diameter of 20 mm, an outer diameter of 30 mm, a height of 120 mm, and a wall thickness of 5 mm, which are cut along the horizontal and vertical center lines after being obliquely cut along the corresponding crack inclination angles. The second crack 702 is a through crack on the entire inner panel 2. The first crack 701 and the second crack 702 have the same inclination angle and center position, and the length of the first crack 701 is greater than that of the second crack 702. The four top curved panels and the four bottom curved panels can form a complete hollow cylinder.

[0041] The bottom support 5 is a plexiglass rod with a diameter of 20 mm and a height of 30 mm, which is used to support a plurality of bottom curved panels.

[0042] In this embodiment, the top support 4 is a snap-on component, and the cylindrical part 401 is a plexiglass rod with a diameter of 20 mm and a height of 30 mm, which is used to support the top curved panel above the second crack 702. The front, rear, left and right of the cylindrical part 401 are respectively connected with an extension part 402 with a length of 20 mm and a width of 5 mm. The extension part 402 is an plexiglass plate, which is used to penetrate the top curved panel above the second crack 702 to prevent it from slipping along the surface of the second crack 702. The straight arm part of the clamping part 403 is 5 mm high and the bending part is 10 mm high. The clamping part 403 is an plexiglass plate. The thickness of the copper sheet 7 is 2 mm, that is, the height of the first crack 701 and the second crack 702 is 2 mm, and the length of the copper sheet 7 is the same as the length of the first crack 701.

[0043] Furthermore, the cylindrical portion of the top support 4 and the outer wall of the bottom support 5 are coated with an adsorbent, and the top panel 201 and the bottom panel 202 are connected by the adsorbent. In the specific implementation process, the adsorbent can be vaseline oil, which not only plays a supporting role, but also facilitates later demoulding.

[0044] Example 3

[0045] On the basis of Example 1 and Example 2, the cylindrical portion 401 of the top support 4 and the bottom support 5 are both made of organic glass rods, and the outer panel 1, the inner panel 2, the bottom plate 3, the extension portion 402 and the clamping portion 403 are all made of organic glass plates.

[0046] like Figure 5 As shown, the bottom plate 3 is a square organic glass plate with a side length of 100 mm and a thickness of 15 mm. A circular groove 301 and an annular groove 302 with a depth of 10 mm are opened at corresponding positions on the bottom plate 3 for inserting the inner panel 2, the outer panel 1 and the bottom support 5.

[0047] The utility model is carried out according to the following steps when making specific samples:

[0048] Step 1, apply vaseline oil on the inner surface of the outer panel 1 of the mold, the inner and outer surfaces of the inner panel 2, the inner wall of the circular groove 301 and the annular groove 302 of the bottom plate 3, and the surface of the copper sheet 7, respectively, to facilitate assembly and later demoulding;

[0049] Step 2, insert the bottom support 5 and the four bottom curved panels on the lower side of the second crack 702 into the circular groove 301 of the bottom plate 3 as a whole;

[0050] Step 3, insert the first outer plate 101 and the second outer plate 102 into the annular groove 302 of the bottom plate 3, insert bolts into the ear holes 601 of the ear plates 6, and tighten them to connect them into a whole;

[0051] Step 4, inserting the prefabricated copper sheet 7 into the non-through crack of the outer panel 1, i.e., the first crack 701;

[0052] Step 5, place the top support 4 upside down on the table, and assemble the four top curved panels above the second crack 702 along the cylindrical portion 401 at the center of the top support 4;

[0053] Step 6, flip the components assembled in step 5 and combine them with the components assembled in step 4. Repeat fine-tuning until the top support 4 can be completely fitted with the inner panel 2 and the outer panel 1. Since vaseline oil is applied to the surface of the inner panel 2 in advance, the four top curved panels can be adsorbed on the cylindrical part 401 at the center of the top support 4 after flipping without falling off;

[0054] Step 7: Pour cement mortar prepared in a certain proportion from the top of the mold and vibrate to ensure compaction, while exhausting the air inside the mold;

[0055] Step 8, put the cement mortar sample together with the mold into a standard curing box for curing for 24 hours, then take it out, extract the embedded copper sheet 7 and continue to put it into the curing box for curing for 3 days;

[0056] Step 9, take out the sample after curing for 3 days and demould it. When demoulding, remove it in the order of "bolts → bottom plate 3 → top support 4 → bottom support 5 → inner panel 2 → outer panel 1";

[0057] Step 10, place the demoulding completed sample into a standard curing box for curing for 28 days, then take it out and use a grinder to polish the upper and lower surfaces of the sample until smooth. The sample is a hollow cylindrical sample with an inner diameter of 30 mm, an outer diameter of 50 mm, and a height of 110 mm ± 2 mm and a non-through crack of a specific length and inclination.

Claims

1. A sample preparation mold for hollow cylindrical torsion shear specimens of fractured rock mass, characterized in that: The invention comprises a bottom plate (3), wherein a circular groove (301) and an annular groove (302) are provided on the bottom plate (3), wherein the inner diameter of the annular groove (302) is larger than the diameter of the circular groove (301), wherein an outer panel (1) is provided in the annular groove (302), wherein a bottom support (5) and an inner panel (2) are provided in the circular groove (301), wherein the inner panel (2) is sleeved on the outside of the bottom support (5); and further comprises a top support (4), wherein the top support (4) comprises a cylindrical portion (401) and an extension portion (402) connected to each other, wherein the cylindrical portion (401) is embedded in the inner cavity of the inner panel (2), wherein the extension portion (402) is provided with a clamping portion along the end portion facing away from the cylindrical portion (401), wherein the clamping portion is clamped with the outer panel (1); and further comprises a copper sheet (7), wherein the copper sheet (7) passes through the outer panel (1) and the inner panel (2).

2. The sample preparation mold for the hollow cylindrical torsional shear specimen of fractured rock mass according to claim 1, characterized in that: The outer panel (1) comprises a first outer panel (101) and a second outer panel (102); the cross-sections of the first outer panel (101) and the second outer panel (102) are both semicircular; the longitudinal sections of the first outer panel (101) and the second outer panel (102) are rectangular; the first outer panel (101) and the second outer panel (102) are abutted to form a hollow cylinder; and the semicircular walls of the first outer panel (101) and the second outer panel (102) are both provided with a first crack (701).

3. The sample preparation mold for the hollow cylindrical torsional shear specimen of fractured rock mass according to claim 2, characterized in that: Both sides of the opening ends of the first outer plate (101) and the second outer plate (102) are connected with ear plates (6), and adjacent ear plates (6) are coaxially provided with ear holes (601), and the first outer plate (101) and the second outer plate (102) are connected by bolts passing through the coaxial ear holes (601).

4. The sample preparation mold for the hollow cylindrical torsional shear specimen of fractured rock mass according to claim 3, characterized in that: The inner panel (2) comprises a top panel (201) and a bottom panel (202); the top panel (201) comprises a plurality of top arc panels sleeved on the circumference of the top support (4), and the plurality of top arc panels abut against each other to form a circular ring; the bottom panel (202) comprises a plurality of bottom arc panels sleeved on the circumference of the bottom support (5), and the plurality of bottom arc panels abut against each other to form a circular ring; a second crack (702) is formed between the plurality of top arc panels and the plurality of bottom arc panels, and the copper sheet (7) penetrates through and abuts against the first crack (701) and the second crack (702).

5. The sample preparation mold for the hollow cylindrical torsional shear specimen of fractured rock mass according to claim 3, characterized in that: The ear plate (6) is made of organic glass.

6. The sample preparation mold for the hollow cylindrical torsional shear specimen of fractured rock mass according to claim 1, characterized in that: The cylindrical portion of the top support (4) and the outer wall of the bottom support (5) are both coated with an adsorbent, and the top panel (201) and the bottom panel (202) are connected via the adsorbent.

7. The sample preparation mold for the hollow cylindrical torsion shear specimen of fractured rock mass according to any one of claims 1 to 6, characterized in that: The cylindrical portion (401) of the top support (4) and the bottom support (5) are both made of organic glass rods, and the outer panel (1), the inner panel (2), the bottom plate (3), the extension portion (402) and the clamping portion (403) are all made of organic glass plates.

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