Jointed rock mass direct shear test specimen pouring device and application method thereof

Abstract

The application discloses a joint rock mass direct shear test piece pouring device and an application method thereof, and the device comprises a pouring mold and a grouting pipe. The pouring mold comprises a lower mold cavity and an upper mold cavity, and the lower grouting pipe is provided with a grout stopping bin. The two mold cavities are both upper-opened cuboid cavities, the bottom plate of the lower mold cavity is provided with a central grouting hole, and the bottom plate of the upper mold cavity is provided with an eccentric grouting hole and an overflow hole. A clamping plate which can slide up and down is arranged in the lower mold cavity, and a test piece mounting hole is arranged in the center of the clamping plate. Symmetrical support plates are connected between the two sides of the clamping plate and the bottom plate of the lower mold cavity, the upper side of the support plate can slide along the clamping plate, and the lower side is hinged to the proximal wall on the bottom plate of the lower mold cavity. When the support plate is vertical, the upper side of the clamping plate is flush with the upper end of the lower mold cavity. A flexible grout stopping mechanism is horizontally embedded in the side wall of the lower mold cavity. In the initial state, the inner end member of the grout stopping mechanism is located in the lower mold cavity, and the outer end member is attached to the inner side wall of the grout stopping bin. When the support plate is rotated to the vertical state, the inner end member is extruded, so that the outer end member transversely stops the grout stopping bin. The upper mold cavity is inverted and locked above the lower mold cavity.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of jointed rock mass direct shear test, and particularly relates to a jointed rock mass direct shear test piece pouring device and an application method thereof. BACKGROUND

[0002] Rock mass is a typical natural geological body formed through geological history of millions of years or even hundreds of millions of years. The rock mass has the characteristics of non-homogeneity, non-continuity and anisotropy, and is often composed of complete rock blocks and discontinuous geological structures (such as faults, structural planes, joint planes and bedding) cutting the rock blocks. The weak planes such as joint planes become important factors determining the overall stability of rock mass engineering due to their extremely low shear strength.

[0003] In the common jointed rock mass direct shear test, the test piece is fixed by pouring cement slurry, and the conventional method is prone to cause the cement slurry pouring to be not full, the gap of the prefabricated shear surface to be too large, or the prefabricated shear surface to be uneven, which has a great influence on the accuracy of the test result. In order to fill the cement slurry, the cement slurry needs to be added manually in small amounts and multiple times, which often causes waste of materials and time. SUMMARY

[0004] The application aims to provide a jointed rock mass direct shear test piece pouring device capable of automatically filling the pouring mold and an application method thereof.

[0005] The jointed rock mass direct shear test piece pouring device provided by the application comprises a pouring mold and a grouting pipe connected thereto. The pouring mold comprises a lower mold cavity and an upper mold cavity, and the lower mold cavity and the upper mold cavity are connected with the grouting pipe. The grouting pipe connected with the lower mold cavity is provided with a cuboid-shaped stop grouting bin. The lower mold cavity and the upper mold cavity are both cuboid cavities with an upper opening. The bottom plate of the lower mold cavity is provided with a central hole as a grouting hole, and the bottom plate of the upper mold cavity is provided with an eccentric hole as a grouting hole and an overflow hole. A clamping plate capable of sliding up and down is arranged in the lower mold cavity, and the clamping plate is provided with a test piece mounting hole at the central position. Symmetrical support plates are connected between the clamping plate and the bottom plate of the lower mold cavity on both sides of the clamping plate. The upper side of the support plate can slide left and right along the clamping plate, and the lower side can be rotatably connected to the proximal wall of the bottom plate of the lower mold cavity. When the support plate is in a vertical state, the upper surface of the clamping plate is flush with the upper end surface of the lower mold cavity. A flexible stop grouting mechanism is horizontally embedded in the side wall of the lower mold cavity. In the initial state, the inner end member of the stop grouting mechanism is located in the lower mold cavity, and the outer end member is attached to the inner side wall of the stop grouting bin. When the support plate is rotated to the vertical state, the inner end member of the stop grouting mechanism is extruded, so that the outer end member of the stop grouting mechanism transversely cuts the stop grouting bin to automatically stop grouting. The upper mold cavity is inverted and locked above the lower mold cavity.

[0006] When the above device is implemented, the clamping plate comprises two clamping plates which are combined to form the test piece mounting hole. The side edges of the clamping plates are provided with sliding members.

[0007] When the device is implemented, the side wall of the lower mold cavity is provided with a vertical groove for mounting the sliding member.

[0008] When the device is implemented, the upper side of the support plate is provided with at least two sliding members symmetrically arranged with respect to the split surface of the clamping plate, and the lower side is hingedly connected with at least two ear plate seats symmetrically arranged with respect to the split surface of the clamping plate.

[0009] When the device is implemented, the width direction of the clamping plate is provided with a corresponding sliding groove for mounting the sliding member, and the ear plate seat is fixed to the proximal wall on the bottom plate of the lower mold cavity.

[0010] When the device is implemented, the stop mechanism includes a connecting plate, a trigger ball, a limiting plate and a compression spring, the width of the connecting plate matches the width of the inner cavity of the stop mechanism, the trigger ball and the limiting plate are fixed to the two ends of the connecting plate respectively, the compression spring is arranged parallel to the connecting plate, one end is fixed to the trigger ball, and the other end is connected to the mounting plate.

[0011] When the device is implemented, the side wall of the lower mold cavity is provided with a through hole with a height greater than the diameter of the trigger ball, and the side wall of the stop mechanism is provided with a through hole with a height greater than the thickness of the connecting plate.

[0012] When the device is implemented, the lower side of the mounting plate is fixed to the bottom surface of the through hole in the side wall of the lower mold cavity, the compression spring extends out of the through hole, and the trigger ball is located in the lower mold cavity.

[0013] When the device is implemented, the top of the two side walls of the lower mold cavity and the upper mold cavity is correspondingly provided with a horizontal plate, and the upper and lower horizontal plates are locked by a bolt connection nut.

[0014] The method for pouring and fixing the jointed rock mass direct shear test by using the device comprises the following steps:

[0015] I. Lower concrete pouring

[0016] (1) Rotate the support plate to the vertical state, install the clamping plate on the upper end of the support plate, and make the upper surface of the clamping plate flush with the upper end surface of the lower mold cavity;

[0017] (2) Insert the test piece into the test piece mounting hole, make the joint surface flush with the upper surface of the clamping plate, and smear the bonding glue at the test piece mounting hole to ensure the stability of the test piece;

[0018] (3) Uniformly press the clamping plate downward until the clamping plate is in a stable position, at this time, the two side support plates symmetrically clamp the test piece, and the central area of the lower mold cavity forms a stable trapezoidal grouting area;

[0019] (4) Grout into the lower mold cavity, in the process of continuously expanding the grouting area, the grout continuously extrudes the two side support plates, and the support plates rotate outward while pushing the clamping plate upward;

[0020] (4) Support plate rotates outward to vertical state extrusion stop ball mechanism, stop ball mechanism limit plate across stop ball warehouse to achieve stop ball, at this time, the clamp plate back to the initial state with the lower mold cavity upper end surface flush, grout injection once full lower mold cavity;

[0021] (5) Maintenance;

[0022] II, the upper part of the concrete pouring

[0023] The upper mold cavity is connected to the lower mold cavity and locked, and the grout is injected into the upper mold cavity. When the overflow hole overflows, stop injecting grout.

[0024] The concrete of the fixed test piece is poured twice, the lower part of the concrete is poured through the lower mold cavity, the inner cavity, the connecting clamp plate and the support plate and the elastic stop ball mechanism, the joint surface of the test piece is clamped through the clamp plate, the support plate, the clamp plate and the lower mold cavity side wall form a closed trapezoidal grout inlet area in the center area of the lower mold cavity, as the grout is continuously injected, the support plate is extruded outward and rotates, at the same time, the clamp plate is pushed upward, the support plate is extruded to the vertical state, the inner end member of the stop ball mechanism is extruded, the outer end member of the stop ball mechanism is transverse to the stop ball warehouse to achieve automatic stop ball, at this time, the clamp plate slides to the upper surface flush with the upper end surface of the lower mold cavity, and the grout is injected once full into the lower mold cavity. After curing, the smooth upper surface of the clamp plate serves as a shear joint surface, which can greatly improve the test accuracy. After the lower part of the concrete is cured, the upper mold cavity is inverted and locked above the lower mold cavity. Since the test piece is stably fixed by the lower part of the concrete and has a smooth shear joint surface, only the upper mold cavity and the connected grout pipe need to be set during the pouring of the upper part of the concrete, and other structures are not needed. The overflow hole can be used to determine whether the grout in the upper mold cavity is full. In short, the lower part of the concrete and the upper part of the concrete of the fixed test piece can be accurately injected once into the corresponding mold cavity, without manual grouting, and the defects of the prior art can be well overcome. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 The schematic diagram of the shape of an embodiment of the present application.

[0026] Figure 2 The schematic diagram of the lower mold cavity and its assembly structure in the embodiment.

[0027] Figure 3 The schematic diagram of the lower mold cavity and its assembly structure in the embodiment. Figure 2 The schematic diagram of the lower mold cavity and its assembly structure in the embodiment.

[0028] Figure 4 The schematic diagram of the lower mold cavity and its assembly structure in the embodiment.

[0029] Figure 5 The schematic diagram of the lower mold cavity and its assembly structure in the embodiment.

[0030] Figure 6 is Figure 2 an enlarged schematic view of part A in

[0031] Figure 7 is Figure 3 an enlarged schematic view of part B in

[0032] Figure 8 is Figure 5 an enlarged schematic view of part C in

[0033] Reference numerals in the drawings:

[0034] 1 - lower mold cavity;

[0035] 2 - upper mold cavity;

[0036] 3 - clamping plate;

[0037] 4 - support plate;

[0038] 5 - grouting pipe;

[0039] 6 - grout stopping bin;

[0040] 7 - grout stopping mechanism;

[0041] 71 - connecting plate; 72 - trigger ball; 73 - limiting plate; 74 - compression spring; 75 - mounting plate;

[0042] 8 - test piece. DETAILED DESCRIPTION

[0043] In combination Figures 1 to 8 It can be seen that the jointed rock mass direct shear test piece pouring device disclosed in the embodiment mainly comprises a lower mold cavity 1, an upper mold cavity 2, a clamping plate 3, a support plate 4, a grouting pipe 5, a grout stopping bin 6 and a grout stopping mechanism 7.

[0044] The lower mold cavity 1 and the upper mold cavity 2 are rectangular parallelepiped cavities with upper openings, and the top portions of the two pairs of side walls are provided with horizontal connecting plates with holes, and are matched with corresponding connecting bolts and locking nuts. The bottom plate of the lower mold cavity is provided with a central hole, and the bottom plate of the upper mold cavity is provided with an eccentric hole, and the eccentric distance is greater than the radius of the test piece.

[0045] The clamping plate 3 is installed in the lower mold cavity 1, and the assembly structure is a sliding block and a sliding groove. The clamping plate 3 is provided with a protruding sliding block 31 at the side edge, and the inner wall of the side plate of the lower mold cavity 1 is provided with a vertically recessed sliding groove, so that the clamping plate 3 can slide up and down along the lower mold cavity 1.

[0046] The two clamping plates 3 arranged in front and back are used to clamp and fix the test piece 8, so when the clamping plates 3 are spliced, a test piece mounting hole is formed at the center position.

[0047] The support plate 4 has two plates arranged left and right, and the length of the support plate 4 matches the inner cavity width of the lower mold cavity 1.

[0048] The lower side of the support plate 4 is provided with an upper groove arranged symmetrically about the lengthwise center plane, and a double lug seat is connected by a pin shaft at the upper groove, which can rotate freely.

[0049] The upper side of the support plate 4 is provided with a lower groove, and a pulley 41 is connected by a pin shaft in the lower groove.

[0050] The support plate 4 is used to support the clamping plate 3, and the widthwise center plane of the clamping plate 3 is provided with a transverse sliding groove 32,

[0051] When the support plate 4 is installed, the double lug seat connected at the lower end is fixed to the proximal wall of the bottom plate of the lower mold cavity 1, and the pulley 41 connected at the upper end is placed in the transverse sliding groove 32.

[0052] The grouting pipe 5 is connected with a grout stopping bin 6, which is a cuboid bin. The grouting pipe is segmented at the grout stopping bin, and the upper and lower segments are respectively fixed to the center of the top and bottom surfaces of the grout stopping bin 6. The grout outlet of the lower segment is connected to the center of the bottom plate of the lower mold cavity 1.

[0053] The grout stopping mechanism 7 includes a connecting plate 71, a trigger ball 72, a limiting plate 73, and a compression spring 74. The width of the connecting plate 71 matches the width of the inner cavity of the grout stopping bin 6. The trigger ball 72 and the limiting plate 73 are respectively fixed to the two ends of the connecting plate 71. The compression spring 74 is arranged parallel to the connecting plate 71, with one end fixed to the trigger ball 72 and the other end perpendicularly connected to a mounting plate 75.

[0054] The grout stopping mechanism 7 is horizontally arranged. The side wall of the lower mold cavity 1 is provided with a horizontal mounting hole, and the proximal side wall of the grout stopping bin 6 is provided with a connecting plate through hole. The diameter of the horizontal mounting hole is slightly larger than the diameter of the trigger ball.

[0055] When the grout stopping mechanism 7 is installed, the lower side of the mounting plate 75 is fixed to the bottom surface of the horizontal mounting hole, the compression spring 74 extends out of the horizontal mounting hole, the trigger ball 72 is located in the lower mold cavity 1, the outer end of the connecting plate 71 penetrates the inner side wall of the grout stopping bin 6, and the limiting plate 73 is attached to the inner side of the inner side wall of the grout stopping bin.

[0056] When the test specimen is poured and fixed, the lower part of the concrete is poured through the lower mold cavity 1 and the above-mentioned structure connected thereto, and the specific process is as follows:

[0057] When the structural member is assembled, the lower side of the support plate 4 is fixed with the bottom plate of the lower mold cavity 1, ensuring that the support plate rotates flexibly and that when it is rotated to the vertical state, it can press the trigger ball 72 to move the limiting plate 73 to the outer side of the inner wall of the grout stopping bin 6, and the grout stopping bin 6 is transversely cut by the connecting plate 71.

[0058] The clamping plate 3 is installed on the upper end of the support plate 4 when the support plate 4 is in the vertical state: the support plate 4 and the clamping plate 3 are assembled through the pulley 41 and the transverse sliding groove 32, and at the same time, the sliding block 31 of the side edge of the clamping plate 3 is assembled with the vertical groove on the inner wall of the lower mold cavity 1.

[0059] When the support plates 4 are in vertical state, the upper surface of the clamping plate 3 is flush with the upper end surface of the lower mold cavity 1, the trigger ball 72 of the stop grouting mechanism 7 enters the through hole in the side wall of the lower mold cavity, and the limiting plate 73 contacts the inner side of the outer side wall of the stop grouting bin 6.

[0060] Insert the test piece 8 into the test piece mounting hole in the center of the clamping plate 3, so that the joint surface of the test piece is flush with the upper surface of the clamping plate, and apply adhesive glue at the test piece mounting hole to keep the test piece stable.

[0061] Uniformly press the clamping plate 3 downward, and the upper ends of the two support plates 4 move toward each other at the same time. When the clamping plate cannot be pressed downward any more, the two support plates contact the two sides of the test piece respectively, and a stable trapezoidal grouting area is formed in the central region of the lower mold cavity, as shown in Figure 2 .

[0062] With the inward rotation of the support plates 4, the trigger ball 72 and the limiting plate 73 of the stop grouting mechanism 7 return to the initial state, and the transverse opening of the stop grouting bin 6 is opened.

[0063] Then the grouting can be carried out. During the grouting process, the grout extrudes the two support plates 4 outward, causing the support plates 4 to rotate outward around the hinge at the lower side, and at the same time, the clamping plate 4 is pushed upward until the support plates 4 rotate to the vertical state, extruding the trigger ball 72 of the stop grouting mechanism, causing the limiting plate 73 of the stop grouting mechanism to move to the opposite side, and the connecting plate 71 prevents the grout from being injected into the lower mold cavity by transversely blocking the stop grouting bin 6. At this time, the clamping plate 4 returns to the initial state of being flush with the upper end surface of the lower mold cavity 1, and the grout is injected into the lower mold cavity at one time.

[0064] Next, the concrete is cured.

[0065] After the curing is completed, the clamping plate 3 serves as the top plate of the lower concrete, and the smooth surface thereof serves as the prefabricated shear joint surface during the shear test.

[0066] The upper concrete fixing the test piece is poured through the upper mold cavity 2, the upper mold cavity connected with the grouting pipe 5 is inverted on the upper end of the lower mold cavity 1 and locked. Since the test piece 8 has been fixed by the lower concrete, the interface between the upper and lower concretes is the smooth surface of the clamping plate 3, so the grouting pipe 5 connected with the upper mold cavity 2 does not need to be connected with the stop grouting bin, nor does it need to be configured with the stop grouting mechanism. The upper mold cavity does not need to be installed with the support plates and the clamping plate, and only needs to be provided with an overflow hole on the top plate when the upper mold cavity is manufactured.

[0067] Since the grouting is from top to bottom in the upper mold cavity 2, the grouting port is eccentrically arranged on the top plate of the upper mold cavity to facilitate the pouring and fixing of the upper half of the test piece.

[0068] During the grouting process, it is observed that the grouting is stopped when the overflow hole on the top plate of the upper mold cavity 2 has grout overflowing, which ensures that the upper mold cavity is full of grout.

[0069] In summary, the present application pours the concrete of the fixed test piece in two times, first pours the lower concrete through the lower mold cavity and the connecting clamping plate and supporting plate and elastic stop grouting mechanism in the inner cavity, clamps the joint surface of the test piece through the clamping plate, encloses the closed trapezoidal grouting area in the central area of the lower mold cavity through the supporting plate, clamping plate and the side wall of the lower mold cavity, with the continuous grouting, the supporting plate is extruded outward and rotates by the grout, at the same time pushes the clamping plate upward, when the supporting plate rotates to the vertical state, extrudes the inner end component of the stop grouting mechanism, makes the outer end component of the stop grouting mechanism cross the stop grouting bin to realize the automatic stop grouting, at this time, the clamping plate slides to the upper surface flush with the upper end surface of the lower mold cavity, the grout fills the lower mold cavity once. After the maintenance is completed, the smooth upper surface of the clamping plate is used as the shear joint surface, which can greatly improve the test precision. After the maintenance of the lower concrete is completed, the upper mold cavity is inverted and locked above the lower mold cavity, since the test piece is stably fixed through the lower concrete and has the smooth shear joint surface, when the upper concrete is poured, only the upper mold cavity and the connected grouting pipe need to be set, other structures are not needed, the overflow hole can be used to judge that the grout in the upper mold cavity is filled. In short, the lower concrete and the upper concrete of the fixed test piece can be accurately filled in the corresponding mold cavity once, manual grouting is not needed, and the defects of the prior art can be well overcome.

Claims

1. A device for pouring jointed rock mass direct shear test specimen, comprising a pouring mold and a grouting pipe connected thereto, characterized in that: the pouring mold comprises a lower mold cavity and an upper mold cavity, and the lower mold cavity and the upper mold cavity are respectively connected to the grouting pipe, and the grouting pipe connected to the lower mold cavity is provided with a cuboid-shaped grouting stopper; the lower mold cavity and the upper mold cavity are both upper-opened cuboid cavities, the bottom plate of the lower mold cavity is provided with a central hole as a grouting hole, and the bottom plate of the upper mold cavity is provided with an eccentric hole as a grouting hole, and an overflow hole is further provided; a clamping plate that can slide up and down is arranged in the lower mold cavity, and the clamping plate is provided with a specimen mounting hole at a central position thereof; support plates are symmetrically connected between the clamping plate and the bottom plate of the lower mold cavity, the upper side of the support plate can slide left and right along the clamping plate, and the lower side can be rotatably connected to the proximal wall of the bottom plate of the lower mold cavity; when the support plate is in a vertical state, the upper surface of the clamping plate is flush with the upper end surface of the lower mold cavity; a flexible grouting stopper mechanism is horizontally embedded in the side wall of the lower mold cavity, and the grouting stopper mechanism comprises a connecting plate, a trigger ball, a limiting plate and a compression spring, the width of the connecting plate matches the inner cavity width of the grouting stopper, the trigger ball and the limiting plate are respectively fixed to the two ends of the connecting plate, the compression spring is arranged parallel to the connecting plate, one end of the compression spring is fixed to the trigger ball, and the other end of the compression spring is connected to a mounting plate; in an initial state, the inner end member trigger ball of the grouting stopper mechanism is located in the lower mold cavity, and the outer end member limiting plate is attached to the inner side wall of the grouting stopper; when the support plate is rotated to a vertical state, the inner end member of the grouting stopper mechanism is extruded, so that the outer end member of the grouting stopper mechanism transversely cuts off the grouting stopper to automatically stop grouting; the upper mold cavity is inverted and locked above the lower mold cavity; the clamping plate comprises two clamping plates that are combined to form the specimen mounting hole, and the side edges of the clamping plates are provided with sliding members; the top portions of the two side walls of the lower mold cavity and the upper mold cavity are respectively provided with horizontal plates, and the upper and lower horizontal plates are locked by a bolt connection nut.

2. The jointed rock mass direct shear test specimen pouring device of claim 1, wherein: the side wall of the lower mold cavity is provided with a vertical groove for mounting the sliding member.

3. The jointed rock mass direct shear test specimen pouring device of claim 1, wherein: the upper side of the support plate is provided with at least two sliding members that are symmetric about the combined surface of the clamping plates, and the lower side is rotatably connected to at least two ear plate seats that are symmetric about the combined surface of the clamping plates.

4. The jointed rock mass direct shear test specimen pouring device of claim 3, wherein: the width direction of the clamping plate is provided with a corresponding sliding groove for mounting the sliding member, and the ear plate seat is fixed to the proximal wall of the bottom plate of the lower mold cavity.

5. The jointed rock mass direct shear test specimen pouring apparatus of claim 1, wherein: the side wall of the lower mold cavity is provided with a through hole with a height greater than the diameter of the trigger ball, and the side wall of the grouting stopper is provided with a through hole with a height greater than the thickness of the connecting plate.

6. The jointed rock mass direct shear test specimen pouring apparatus of claim 5, wherein: the lower side of the mounting plate is fixed to the bottom surface of the through hole of the side wall of the lower mold cavity, the compression spring extends out of the through hole, and the trigger ball is located in the lower mold cavity. 7.A method for pouring and fixing jointed rock mass direct shear test specimen by using the device of claim 1, comprising the following steps: I.lower concrete pouring (1) rotate the support plate to a vertical state, install the clamping plate on the upper end of the support plate, and make the upper surface of the clamping plate flush with the upper end surface of the lower mold cavity; (2) insert the specimen into the specimen mounting hole, make the joint surface flush with the upper surface of the clamping plate, and apply adhesive glue at the specimen mounting hole to ensure the stability of the specimen; (3) uniformly press the clamping plate downward until the clamping plate is in a stable position, at this time, the support plates on both sides symmetrically clamp the specimen, and a stable trapezoidal grouting area is formed in the central region of the lower mold cavity; (4) The slurry continuously extrudes the support plates on both sides while the slurry area is continuously expanding, and the support plates rotate outward while pushing the clamping plate upward; (4) The support plates rotate outward to the vertical state to extrude the trigger ball of the stop slurry mechanism, and the limiting plate of the stop slurry mechanism transversely stops the slurry tank to achieve slurry stopping. At this time, the clamping plate returns to the initial state of being flush with the upper end surface of the lower mold cavity, and the slurry fills the lower mold cavity at one time; (5) Curing; II. Upper concrete pouring The upper mold cavity connected with the grouting pipe is buckled above the lower mold cavity and locked, and the slurry is injected into the upper mold cavity. When the overflow hole has slurry overflow, stop injecting slurry.

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