A test device for testing rock fracture toughness

A technology of fracture toughness and test equipment, applied in the direction of applying stable tension/pressure to test the strength of materials, etc., can solve the problems of shearing of difficult rocks and measurement of composite fracture toughness, and achieve simple loading and unloading process and easy operation Easy to use, reasonable design effect

Inactive Publication Date: 2016-06-22
INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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Problems solved by technology

Many scholars have questioned the theoretical analysis and calculation formula derivation of the Brazilian disc splitting test, and the improved Brazilian disc test equipment is often used to measure the fracture toughness of rocks, but there are certain limitations in the structural design. , it is difficult to measure the shear and composite fracture toughness of rock

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  • A test device for testing rock fracture toughness
  • A test device for testing rock fracture toughness
  • A test device for testing rock fracture toughness

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Embodiment Construction

[0016] Below in conjunction with accompanying drawing and operating principle the present invention is described in detail, see figure 1 :

[0017] A test device for testing the fracture toughness of rocks, the device consists of a pad 2, a spring positioning device 3, a dial gauge 4, a loading shaft 5, an upper cover 6, an oil inlet 7, an exhaust port 8, an oil outlet 9, The oil pipeline 10, the box body 11, the top cover 12, the oil chamber 13, and the collar 14 are composed of coaxial circular holes symmetrically arranged on the two side walls of the box body 11, and the spring positioning devices 3 are respectively movable and placed on the coaxial circular holes. The hole is used to fix the sample 1; the outer wall of the loading shaft 5 is provided with a collar 14 whose section is concentric with the section of the loading shaft. The upper cover 6 is bolted, and the upper cover 6 is set on the loading shaft 5 and connected with the box body 11 by bolts. There is an oil...

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Abstract

The invention relates to a test device for testing rock fracture toughness, in particular to a test device for measuring rock fracture toughness under confining pressure. It belongs to the technical field of geotechnical engineering. The present invention adopts the addition of a confining pressure device in the original Brazilian disc test device, which changes the method of simply directly loading and splitting the test in the existing test device, and adds a spring positioning device, a sealing device and a self-balancing device in the box body , and is equipped with a dial indicator, oil filling port and exhaust port, etc., to record the lateral and axial displacement changes and control the liquid in the box to form a stable confining pressure. After putting the sample into the box, the spring positioning device is used to fix the sample, and the addition of a self-balancing device can make the loading shaft not affected by the confining pressure, which is convenient for controlling the loading of the sample. The device can realize the splitting test of the rock sample under the confining pressure, thereby calculating the fracture toughness of the sample. The design of the test device is reasonable, the operation is convenient, and it is suitable for the determination of the fracture toughness of various rocks.

Description

technical field [0001] The invention relates to a test device for testing rock fracture toughness, in particular to a test device for measuring rock type I, type II and composite type I-II fracture toughness under the action of confining pressure. It belongs to the technical field of geotechnical engineering. Background technique [0002] The Brazilian disk splitting test has been widely used at home and abroad since it was recommended by the International Society of Rock Mechanics as an indirect method for determining the tensile strength of rocks in 1978. In my country, this method has been included in the national standard "Engineering Rock Mass Test Method Standards" and the industry standard "Rock Test Regulations for Water Conservancy and Hydropower". Many scholars have questioned the theoretical analysis and calculation formula derivation of the Brazilian disc splitting test, and the improved Brazilian disc test equipment is often used to measure the fracture toughnes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/12
Inventor 潘鹏志苏方声段淑倩冯夏庭晏飞刘继光
Owner INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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