CN219224331U

CN219224331U - True triaxial fractured rock mass sample preparation mould

Info

Publication number: CN219224331U
Application number: CN202320286586.7U
Authority: CN
Inventors: 蒲诚; 李跃涛; 温家兴; 黎康平; 赵靖伟; 李敬昌
Original assignee: PowerChina Northwest Engineering Corp Ltd
Current assignee: PowerChina Northwest Engineering Corp Ltd
Priority date: 2023-02-22
Filing date: 2023-02-22
Publication date: 2023-06-20
Anticipated expiration: 2033-02-22

Abstract

A true triaxial fractured rock mass sample preparation mold comprises a bottom plate, four coamings and a fracture forming device; the four coamings are detachably connected with the same surface of the bottom plate respectively to form a square column-shaped accommodating cavity; adjacent coaming plates are detachably connected; the crack forming device is arranged on the coaming and is positioned in the square column type accommodating cavity. According to the utility model, the detachable mould is adopted, the coaming is pulled out, so that demoulding can be completed, and damage to a sample in the demoulding process is avoided. Meanwhile, two coamings of the prefabricated fracture can be replaced according to fracture parameters, so that the fracture parameters such as fracture inclination angle, fracture ductility and the like can be changed, the die manufacturing cost and experimental resources are greatly saved, and the preparation efficiency of the sample is improved.

Description

True triaxial fractured rock mass sample preparation mould

Technical Field

The utility model discloses a true triaxial fractured rock mass sample preparation die, and belongs to the technical field of rock mass structural surface performance test.

Background

The fracture characteristics of the rock are one of the most important characteristics of the rock, the mechanical characteristics of the fractured rock are affected to different degrees by the ductility, trend, tendency and the like of the fracture, and the research on the fracture of the rock has important practical significance for searching mineral products, hydrogeology and engineering geology, wherein the research on the fracture of the deep rock is more practical, the deep rock is in a true three-dimensional stress state, and the deformation damage of the rock cannot be accurately simulated by a conventional triaxial test, so that the true triaxial test which can reflect the true constitutive relation more than the conventional triaxial test is more widely applied to the field of rock mechanics.

Because the deep rock mass is in a complex environment with high ground stress, high ground temperature and high water pressure, the problem of difficult sampling and sample preparation exists. In the prior art, a fractured rock mass sampling mould is used for simulating and preparing a deep rock mass.

The existing true triaxial fractured rock mass sample preparation mould is integrally processed, when parameters such as fracture inclination angle, fracture ductility and the like are changed, the mould is required to be manufactured again, a group of tests often need to process a plurality of moulds, time and labor are consumed, and resource waste is caused.

Disclosure of Invention

The utility model overcomes the defects of the prior art and provides a true triaxial fractured rock mass sample preparation mould which comprises a bottom plate, four coamings and a fracture forming device;

the four coamings are detachably connected with the same surface of the bottom plate respectively to form a square column-shaped accommodating cavity;

the adjacent coamings are detachably connected;

the crack forming device is arranged on the coaming and is positioned in the square column type accommodating cavity.

Preferably, the device further comprises a protection unit;

the protection unit is sleeved on the outer side of the square column type accommodating cavity.

Preferably, the protection unit is fixedly connected with the bottom plate.

Preferably, the protection unit comprises four guard plates, and adjacent guard plates are fixedly connected.

Preferably, the contact surfaces between adjacent guard plates are mutually matched inclined surfaces.

Preferably, the coaming is divided into a first coaming and a second coaming;

the first coaming is connected with the second coaming adjacently;

the first bounding wall with the both sides side that the second bounding wall is connected sets up assorted recess and arch respectively, recess and arch are followed hold the open end in chamber to the bottom plate direction extends.

Preferably, said fracture forming means passes through two opposed said coamings.

Preferably, the crack forming device is a strip-shaped metal with a cross section in a straight shape or a strip-shaped metal with a cross section in a cross shape.

Preferably, the device further comprises a shackle;

the shackle is disposed on an outer surface of the shroud.

Preferably, the material of bottom plate with the bounding wall is transparent material.

The beneficial effects are that: according to the utility model, the detachable mould is adopted, the coaming is pulled out, so that demoulding can be completed, and damage to a sample in the demoulding process is avoided. Meanwhile, two coamings of the prefabricated fracture can be replaced according to fracture parameters, so that the fracture parameters such as fracture inclination angle, fracture ductility and the like can be changed, the die manufacturing cost and experimental resources are greatly saved, and the preparation efficiency of the sample is improved.

Drawings

FIG. 1 is a schematic diagram showing the effects of a mold in an embodiment of the present utility model;

fig. 2 is a three-view of a mold without a copper sheet inserted therein according to an embodiment of the present utility model, wherein (a) is a front view of the mold according to an embodiment of the present utility model, (b) is a left view of the mold according to an embodiment of the present utility model, and (c) is a top view of the mold according to an embodiment of the present utility model.

In the figure: 1. a first coaming; 2. a second coaming; 3. copper sheets; 4. a guard board; 5. a bottom plate.

Detailed Description

In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present utility model. It will be apparent, however, to one skilled in the art that the present utility model may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems and devices are omitted so as not to obscure the description of the present utility model with unnecessary detail.

The preferred technical scheme of the utility model is further described below with reference to the accompanying drawings and examples.

1-2, a true triaxial fractured rock mass sample preparation mould is provided, wherein a true triaxial sample is an orthocube or a cuboid, so that the true triaxial sample preparation mould is an orthocube or a cuboid and comprises a bottom plate 5, four coamings and a fracture forming device, wherein the four coamings are respectively detachably connected with the same surface of the bottom plate 5 to form a square column-shaped accommodating cavity; the size of the accommodating cavity is related to a true triaxial tester, the bottom plate 5 and the coaming are made of transparent materials, and organic glass, toughened glass and the like can be selected. In the embodiment, the bottom plate 5 and the coaming are made of organic glass with the thickness of 10mm, and the accommodating cavity is formed by respectively: the square column type containing cavity formed by 50mm, 50mm and 100mm can be used for intuitively monitoring the sample preparation process by the transparent organic glass.

Adjacent coamings in the die are detachably connected; the four coamings are fixedly and detachably connected with the bottom plate 5 in a plurality of connection modes such as mortise-tenon connection, concave-convex groove matching connection, bolt connection, adhesive connection and the like. The bottom plate 5 may be provided with a concave or convex platform as the bottom of the square column-shaped accommodating cavity. The above arrangement can ensure the integrity of the die, and the casting material can not overflow from the connecting gap during sample preparation. The casting materials for preparing the sample are various, cement mortar is selected in the embodiment,

wherein the coaming is divided into a first coaming 1 and a second coaming 2; the first coaming plate 1 is adjacently connected with the second coaming plate 2; the two side edges of the first coaming 1 and the second coaming 2 are respectively provided with a matched groove and a matched bulge, and the grooves and the bulges extend towards the direction of the bottom plate 5 along the opening end of the accommodating cavity. The crack forming device is arranged on the first coaming plate 1 and is positioned in the square column type accommodating cavity, and the crack forming device penetrates through the two opposite first coaming plates 1. The crack forming device is a strip-shaped metal with a cross section in a straight shape or a plurality of strip-shaped metal or mica sheets with cross sections in a cross shape and the like. The outer surface of the enclosure plate further comprises a shackle which can be provided on each enclosure plate or on the first enclosure plate 1 provided with a crack forming means, the shackle being adapted to be withdrawn into the enclosure plate during demoulding or installation.

The protection unit is sleeved outside the square die containing the cavity sample, comprises a steel wire rope, a metal clamp plate, a wood plate and the like, is sleeved on the outer surface of the die and used for fixing the coaming, and the coaming is prevented from being displaced or deformed when being vibrated by pouring cement mortar. The protection unit can enclose the cover in the centre of mould, upper portion or lower part, and is further, protection unit sets up in the lower part of mould and with bottom plate 5 fixed connection, fixed connection can further protect cement mortar to pour the time can not spill over or ooze from bounding wall and bottom plate 5 junction between protection unit and the bottom plate 5.

Specifically, in this embodiment, the protection unit is four protection plates 4 made of transparent organic glass, and the adjacent protection plates 4 are fixedly connected. When the guard plates 4 are arranged, the guard plates 4 and the bottom plate 5 can be fixedly connected through bolts, mortise and tenon joints or gluing and the like, the contact surfaces of the adjacent guard plates 4 are mutually matched inclined surfaces, and the cutting angle of the edges of the plates is 45 degrees.

One method of use of the mold in this embodiment is as follows:

as shown in fig. 1, in the mold effect diagram in this embodiment, first, square organic glass with a thickness of 10mm, a side length of 120mm and a smooth surface is selected as a bottom plate 5, four organic glass plates with the same size are enclosed in the middle of the bottom plate 5 as guard plates 4 of a protection unit, contact surfaces of adjacent guard plates 4 are cut at 45 degrees, the length of the guard plates 4 is 90mm, the width of the guard plates is 30mm, the thickness of the guard plates is 10mm, the adjacent guard plates 4 are glued as a whole by adopting adhesive glue, and the guard plates 4 are glued on the bottom plate 5 by adopting the same glue to form a square column cavity with a side length of 70mm and a height of 30 mm. Secondly, the four coamings are connected through concave-convex grooves, wherein the opposite first coamings 1 are provided with prefabricated cracks, the crack parameters are set according to the crack parameters of the sample, and the side edges of the two sides of the first coamings connected with the second coamings are provided with bulges. The second coaming 2, which is not pre-slit, is provided with a recess matching the first coaming 1. Soaking the outer surface of the protective plate by water, placing the protective plate into a square column cavity surrounded by the protective plate 4, tightly attaching the protective plate 4, and surrounding the protective plate to form a rectangular column with the length, width and height of: the square column type containing cavity with the thickness of 50mm, 50mm and 100mm is coated with a release agent on the inner surface of the coaming, wherein the release agent can be oil, vaseline and the like, so that cost is saved. As shown in fig. 2, three views of the mold in this embodiment.

The appropriate fracture parameters are selected, the fracture in the embodiment is 0.5mm thick, 2mm wide and the inclination angle is 30 degrees crossed, and the matched copper sheet 3 is selected, specifically: copper sheets 3 with the thickness of 0.5mm, the width of 2mm and the length of 100mm are coated with oil on the surfaces of the copper sheets 3, so that demolding is convenient, and the copper sheets 3 are inserted into prefabricated crack openings of two opposite coamings. Weighing cement mortar with corresponding mass, pouring the cement mortar into a pre-assembled mold, vibrating to ensure compaction, placing a vibrating compact sample and the mold into a standard curing box for curing, taking out the curing sample and the mold for 2 hours, embedding a copper sheet 3 into the sample, and then continuously placing the sample into the standard curing box for curing. And taking out the sample which is cured again for 3 days together with the mould, taking out surrounding plates around the mould, taking out the sample from the mould, completing demoulding, and placing the sample into a standard curing box for curing for 28 days.

And finally, taking out the sample after maintenance, polishing the upper and lower surfaces of the sample by a polishing machine to be smooth, wherein the non-parallel error of the two end surfaces of the sample is less than 0.05mm, and the end surfaces of the sample are parallel to the axis of the sample. And (3) completing sample preparation and performing a true triaxial test.

According to the utility model, the detachable mould is adopted, the coaming is pulled out, so that demoulding can be completed, and damage to a sample in the demoulding process is avoided. Meanwhile, two coamings of the prefabricated fracture can be replaced according to fracture parameters, so that the fracture parameters such as fracture inclination angle, fracture ductility and the like can be changed, the die manufacturing cost and experimental resources are greatly saved, and the preparation efficiency of the sample is improved.

The foregoing description is only a few examples of the present application and is not intended to limit the present application in any way, and although the present application is disclosed in the preferred examples, it is not intended to limit the present application, and any person skilled in the art may make some changes or modifications to the disclosed technology without departing from the scope of the technical solution of the present application, and the technical solution is equivalent to the equivalent embodiments.

Claims

1. The true triaxial fractured rock mass sample preparation mould is characterized by comprising a bottom plate, four coamings and a fracture forming device;

the adjacent coamings are detachably connected;

2. The true triaxial fractured rock mass sampling mold according to claim 1, further comprising a protection unit;

3. The true triaxial fractured rock mass sampling mold according to claim 2, wherein the protection unit is fixedly connected with the bottom plate.

4. A true triaxial fractured rock mass sampling mould according to claim 3, wherein the protection unit comprises four guard plates, and adjacent guard plates are fixedly connected.

5. The true triaxial fractured rock mass sampling mold according to claim 4, wherein the contact surfaces between adjacent guard plates are mutually matched inclined surfaces.

6. The true triaxial fractured rock mass sampling mould according to any one of claims 1 to 5, wherein the shroud is divided into a first shroud and a second shroud;

the first coaming is connected with the second coaming adjacently;

7. A true triaxial fractured rock mass sampling mould according to claim 1, wherein the fracture forming means passes through two opposed shroud plates.

8. The true triaxial fractured rock mass sampling mold according to claim 7, wherein the fracture forming means is a strip-shaped metal having a straight cross section or a strip-shaped metal having a cross section.

9. The true triaxial fractured rock mass sampling mold of claim 1, further comprising a shackle;

the shackle is disposed on an outer surface of the shroud.

10. The true triaxial fractured rock mass sampling mold according to claim 1, wherein the bottom plate and the coaming are made of transparent materials.