Simple confining pressure loading device for rock triaxial compression test

Abstract

The utility model discloses a simple confining pressure loading device for a triaxial compression test of rock, which comprises a rubber sleeve, two steel inner cylinders, a steel outer cylinder and a steel pad, the two steel inner cylinders are symmetrically clamped on the outer side of the rubber sleeve to form a cylinder, and then are embedded in the steel outer cylinder; the upper end and the lower end of the steel inner cylinder are connected with the steel outer cylinder through an upper sealing flange and a lower sealing flange respectively, and built-in rubber sealing rings are arranged between the upper sealing flange and the steel inner cylinder and between the upper sealing flange and the rubber sleeve and between the lower sealing flange and the steel inner cylinder and between the lower sealing flange and the rubber sleeve respectively. The pressure of the single-shaft compressor is transmitted to the upper and lower surfaces of the rock test piece. The device is extremely low in manufacturing cost and easy to operate, when the device is used, the device only needs to be directly arranged on a single-shaft compressor platform, confining pressure is loaded and controlled through the hydraulic oil pump, and operation can be completed by one person; compared with a three-axis compression experiment system on the market, the three-axis compression experiment system is low in cost.

Description

Technical Field

[0001] The utility model relates to the field of triaxial compression test equipment, in particular to a simple device for confining pressure loading in a triaxial compression test of rock. Background Art

[0002] The study of rock triaxial compression mechanical characteristics is a hot and difficult issue in the field of rock (volume) mechanics and is an essential means of studying the mechanical properties of geotechnical materials. Through triaxial compression testing, the mechanical strength and deformation characteristics of geotechnical materials under different confining pressures can be determined, the internal friction angle and cohesion can be calculated, the rock strength curve can be plotted, and basic mechanical parameters such as the elastic modulus and Poisson's ratio can also be calculated. Currently, the triaxial compression mechanical characteristics of rock are mostly determined using triaxial compression instruments, but these instruments are expensive. Utility Model Content

[0003] In order to solve the above problems, the utility model provides a simple device for confining pressure loading in a rock triaxial compression test, which has low cost, simple operation and strong practicality.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A simple device for confining pressure loading in a triaxial compression test of rock comprises a rubber sleeve, a steel inner cylinder, a steel outer cylinder and a steel pad. The number of the steel inner cylinders is two, which are symmetrically clamped on the outside of the rubber sleeve to form a cylinder and then embedded in the steel outer cylinder. The upper and lower ends are respectively connected to the steel outer cylinder through an upper sealing flange and a lower sealing flange. Built-in rubber sealing rings are provided between the upper sealing flange and the steel inner cylinder and the rubber sleeve, and between the lower sealing flange and the steel inner cylinder and the rubber sleeve. The steel pad is movably arranged in the rubber sleeve to transmit the pressure of the uniaxial compressor to the upper and lower surfaces of the rock specimen.

[0006] Furthermore, the steel outer cylinder is a hollow cylindrical structure, on which an oil inlet hole and an oil outlet hole are opened, and the oil inlet hole and the oil outlet hole are sealed by threaded steel caps respectively.

[0007] Furthermore, the rubber sleeve is an I-shaped cylindrical structure, with a through groove for placing cylindrical rock specimens longitudinally opened at the center of the interior, and the steel pad is arranged in the through groove, and its outer diameter is adapted to the inner diameter of the through groove.

[0008] Furthermore, the two steel inner cylinders have the same structure, both comprising a semicircular outer shell and an arc-shaped clamping block integrally formed on the inner wall of the semicircular outer shell.

[0009] The utility model has the following beneficial effects:

[0010] 1) Simple operation. When using, you only need to place the device directly on the single-axis compressor platform, load and control the surrounding pressure through the hydraulic oil pump, and one person can complete the operation;

[0011] 2) Low cost. Compared with the triaxial compression test systems on the market that cost more than one million yuan, this device is extremely cheap. Together with the hydraulic oil pump (about 500 yuan), the total cost is about 2,000 yuan. It is suitable for most scientific research groups such as universities, research institutes and enterprises with limited funds.

[0012] 3) High practicability: the device does not affect the normal use of the uniaxial compressor and can be used for triaxial compression tests after simple installation, which is highly practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Other features, objects and advantages of the present invention will become more apparent from the detailed description of the non-limiting embodiments with reference to the following drawings:

[0014] Figure 1 The present invention is a schematic diagram of the overall structure of a simple device for confining pressure loading in a triaxial compression test of rock according to an embodiment of the present invention.

[0015] Figure 2 for Figure 1 Back view of .

[0016] Figure 3 It is a structural diagram of the rubber sleeve.

[0017] Figure 4 This is a cross-sectional view of the rubber sleeve.

[0018] Figure 5 Schematic diagram of the structure of the steel inner tube.

[0019] Figure 6 This is a cross-sectional view of the steel inner tube.

[0020] Figure 7 It is a schematic diagram of the connection structure between the rubber sleeve and the steel inner cylinder.

[0021] Figure 8 It is a cross-sectional view of the utility model.

[0022] In the figure: 1- rubber sleeve; 2- steel inner cylinder; 3- steel outer cylinder; 4- upper sealing flange; 5- lower sealing flange; 6- rubber sealing ring; 7- oil inlet hole; 8- oil outlet hole; DETAILED DESCRIPTION

[0023] The present invention will be described in detail below with reference to specific embodiments. The following embodiments will help those skilled in the art further understand the present invention, but are not intended to limit the present invention in any way. It should be noted that a person skilled in the art may make various modifications and improvements without departing from the scope of the present invention. These modifications and improvements are all within the scope of protection of the present invention.

[0024] like Figures 1-8 As shown, the utility model is a simple device for confining pressure loading of a rock triaxial compression test, comprising a rubber sleeve 1, a steel inner cylinder 2, a steel outer cylinder 3 and a steel pad. The number of the steel inner cylinders 2 is two, which are symmetrically clamped on the outside of the rubber sleeve 1 to form a cylinder and then embedded in the steel outer cylinder 3. The upper and lower ends are respectively connected to the steel outer cylinder through an upper sealing flange 4 and a lower sealing flange 5, and a built-in rubber sealing ring 6 is provided between the upper sealing flange 4 and the steel inner cylinder 2 and the rubber sleeve 1, and between the lower sealing flange 5 and the steel inner cylinder 2 and the rubber sleeve 1. The steel pad is movably arranged in the rubber sleeve 1 to transmit the pressure of the uniaxial compressor to the upper and lower surfaces of the rock specimen. During assembly, first symmetrically clamp the two steel inner cylinders 2 outside the rubber sleeve 1 to form a cylindrical structure, then embed the cylindrical structure as a whole into the steel outer cylinder 3, and finally seal the upper sealing flange 4 and the steel inner cylinder 2 and the rubber sleeve 1, and the lower sealing flange 5 and the steel inner cylinder 2 and the rubber sleeve 1 through the upper sealing flange 4, the lower sealing flange 5, the sealing rubber ring 6, bolts and other anti-seepage materials.

[0025] In this embodiment, the steel outer cylinder 3 is a hollow cylindrical structure, on which an oil inlet hole 7 and an oil outlet hole 8 are provided. The oil inlet hole 7 and the oil outlet hole 8 are sealed by threaded steel caps respectively. At the same time, a plurality of bolt holes are provided on it for fitting bolts to realize connection with the upper sealing flange and the lower sealing flange.

[0026] In this embodiment, the rubber sleeve 1 is an I-shaped cylindrical structure, and a through groove for placing a cylindrical rock specimen is longitudinally opened at the center of the interior. The inner diameter of the through groove is adapted to the size of the standard rock specimen (a cylindrical rock specimen with a diameter of 50 mm and a height of 100 mm), and the inner diameter is 51 mm. The steel pad is cylindrical, and its outer diameter is adapted to the inner diameter of the through groove. After the standard rock specimen is inserted into the rubber sleeve 1 and enters the through groove, the pressure of the uniaxial compressor is transferred to the upper and lower surfaces of the rock specimen by inserting cylindrical steel pads of equal size into the upper and lower parts of the through groove, thereby realizing the loading of the axial pressure of the specimen.

[0027] In this embodiment, the two steel inner cylinders 2 have the same structure. One of the steel inner cylinders 2 is provided with a threaded oil inlet, and the other steel inner cylinder 2 is provided with a threaded oil outlet. Both steel inner cylinders 2 include a semicircular outer shell 21 and an arc-shaped clamping block 22 integrally formed on the inner wall of the semicircular outer shell. The outer diameter of the arc-shaped clamping block 22 is 116 mm and the inner diameter is 61 mm. The length of the steel inner cylinder and the height of the rubber sleeve and the steel outer cylinder are all 150 mm.

[0028] This specific implementation can be used for confining pressure loading of rock compression tests with the help of a uniaxial compressor system to realize conventional (equal confining pressure) triaxial compression tests of rocks. When in use, the entire device is first placed vertically on the platform of the uniaxial compression testing machine, and a standard rock specimen (a cylindrical rock specimen with a diameter of 50 mm and a height of 100 mm) is inserted into the through groove of the rubber sleeve in the device. Then, cylindrical steel pads of equal size are inserted into the through groove of the rubber sleeve at the upper and lower bottom surfaces of the standard rock specimen to transfer the pressure of the uniaxial compressor to the upper and lower surfaces of the rock specimen, thereby realizing axial pressure loading of the specimen; the confining pressure is loaded by means of an oil pump through oil pressure control; other functions of the rock compression test, such as stress and deformation detection and result output, are all realized by the uniaxial compressor system.

[0029] In this specific implementation, when confining pressure control is required, the oil inlet is connected to the hydraulic oil pump with a hose to load the device oil pressure (confining pressure of the triaxial compression test); the oil outlet is sealed with a threaded steel cap, and the cap can be opened to drain the oil when oil needs to be changed or confining pressure is unloaded; the oil pressure is displayed by the pressure gauge on the oil pump.

[0030] In this specific implementation, after the rubber sleeve is damaged, the bolts can be removed to separate the upper sealing flange, the lower sealing flange, the steel inner cylinder and the rubber sleeve, and the rubber sleeve can be replaced.

[0031] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art may make various modifications or variations within the scope of the claims, which do not affect the essence of the present invention.

Claims

1. A simple device for confining pressure loading in triaxial compression test of rock, characterized by: It includes a rubber sleeve, a steel inner cylinder, a steel outer cylinder and a steel pad. There are two steel inner cylinders, which are symmetrically clamped on the outside of the rubber sleeve to form a cylinder and then embedded in the steel outer cylinder. The upper and lower ends are respectively connected to the steel outer cylinder through an upper sealing flange and a lower sealing flange, and built-in rubber sealing rings are provided between the upper sealing flange and the steel inner cylinder and the rubber sleeve, and between the lower sealing flange and the steel inner cylinder and the rubber sleeve. The steel pad is movably arranged in the rubber sleeve to transmit the pressure of the uniaxial compressor to the upper and lower surfaces of the rock specimen.

2. A simple device for confining pressure loading in a triaxial compression test of rock according to claim 1, characterized in that: The steel outer cylinder is a hollow cylindrical structure, on which an oil inlet hole and an oil outlet hole are opened. The oil inlet hole and the oil outlet hole are sealed by threaded steel caps respectively.

3. The simple device for confining pressure loading in a triaxial compression test of rock according to claim 1, characterized in that: The rubber sleeve is an I-shaped cylindrical structure, with a through groove for placing cylindrical rock specimens longitudinally opened at the center of the interior. The steel pad is arranged in the through groove, and its outer diameter is adapted to the inner diameter of the through groove.

4. The simple device for confining pressure loading in a triaxial compression test of rock according to claim 1, characterized in that: The two steel inner cylinders have the same structure, both comprising a semicircular outer shell and an arc-shaped clamping block integrally formed on the inner wall of the semicircular outer shell.

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