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Device for testing fracture toughness of rock

A technology of fracture toughness and test equipment, which is applied to test equipment for testing rock fracture toughness, test equipment for type II and composite type I-II fracture toughness, and for measuring rock type I, which can solve the problem of shearing of difficult rocks. and complex fracture toughness measurement, etc., to achieve the effect of simple loading and unloading process, reasonable design, and convenient operation and use.

Inactive Publication Date: 2014-02-26
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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  • Device for testing fracture toughness of rock
  • Device for testing fracture toughness of rock
  • Device for testing fracture toughness of rock

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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, the upper cover 6 is set on the loading shaft 5 and connected with the box body 11 by bolts, an oil chamber 13 i...

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Abstract

The invention relates to a device for testing fracture toughness of rock and especially relates to a device for testing fracture toughness of rock under the action of confining pressure, and belongs to the technical field of rock engineering. Through use of a confining pressure application device in the original Brazilian disc test device, a simple direct loading splitting test way of the existing test device is changed; and through use of a spring positioning device, a sealing device and a self-balancing device arranged in the box, and use of a dial indicator, an oil filling port and an exhaust port as matching devices, lateral and axial displacement change is recorded and the liquid in the box is controlled so that stable confining pressure is formed. After a sample is put into the box, the sample is fixed by the spring positioning device, and the self-balancing device is used for preventing the influence produced by the confining pressure on a loading shaft so that sample loading can be controlled conveniently. The device can realize a splitting test on a rock sample under the confining pressure, can calculate fracture toughness of the rock sample, has a reasonable design, is convenient for operation and is suitable for fracture toughness determination on various types of rock.

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 Applications(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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