Novel three point bending test device for rock sample

Abstract

The invention relates to a novel three point bending test device for a rock sample, which belongs to test equipment. The test device is formed by a base, supports, rolling shafts and adjusting bolts, wherein the supports of the test device are in a rectangular shape; rolling shaft positioning grooves are arranged above the supports; the adjusting bolts are located in guide holes of the base and are arranged in bolt holes in bosses of the supports in a rotating way; a space between the supports can be adjusted through rotating the adjusting bolts, and the offset of the supports can be avoided; and meanwhile, scale marks are marked on the surface of the base, so that the supports can be positioned according to the size of the rock sample. The rolling shafts of the supports are fixedly arranged in the rolling shaft positioning grooves of the supports through springs, so that friction between the rock sample and the supports can be reduced, mutual sliding of the rock sample and the rolling shafts is prevented, and the measured value is more accurate. According to the test device, the deformation and the conversion between signals in a traditional method are changed, the real-time monitoring on a three point bending test of the rock sample is realized, the intuitiveness is strong, the structure is reasonable, the operation is flexible and simple, the effect is good, and the disassembly is convenient.

Description

Technical field [0001] The invention relates to a novel three-point bending test device for a rock sample, in particular to the determination of the fracture toughness of a rock sample, belonging to the category of test equipment. Background technique [0002] The fracture toughness of rock specimens is used as a parameter of rock material classification and an indicator of the rock fragmentation process. It has been widely used in hydraulic fracturing, blasting fracturing and stability analysis. When predicting the mechanical properties of actual engineering rock masses, rock fracture toughness is the main parameter. However, due to various factors such as loading rate, loading method, prefabricated crack size and pattern, rock material properties and loading equipment, it must be accurate It is very difficult to obtain the fracture toughness value of rock materials. Therefore, how to accurately obtain the testing technology and experimental method of rock fracture toughness va...

AI Technical Summary

Problems solved by technology

At the same time, manually adjusting the distance between the two supporting points of the rock sample according to the diameter of the rock sample will inevitably cause the deviation of the rock sample, which will eventually lead to errors in the test results.

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