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Study of Concrete under the Action of Hydraulic fracturing in Ⅰ - Ⅱ mixed mode fracture criterion

Abstract

This paper simulates the concrete under the action of hydraulic fracturing in Ⅰ-Ⅱ mixed mode fracture. Double-K fracture criterion results in two different loading modes, that is, crack initiation and instability. According to Prefabricated crack and width of the specimen, experimental study of hydraulic fracturing, and the two different loading modes fracture of the specimen were fitted by making the angle formed by the four batches of 24 specimens to be 0°, 30°, 45° and 60° respectively. Axial tensile specimens is applied using hydraulic pressure loading, the crack tip paste the half-bridge strain gages and mounted clip-on extensometer for measurement of crack initiation, extension length and crack opening displacement, the specimen on the two side of water pressure sensor for measuring the extension of the fracture pressure. The total fracture toughness is calculated using overlay method from double-K fracture parameters that is water pressure and axial loads. Study found that, Ⅰ-Ⅱ mixed mode fracture study used two different loading modes component, that is type Ⅰ and Ⅱ fracture component. Under the same angle, and are basically the same, and all specimens with prefabricated crack, the crack width decreases with an increase in angle.

Mustapha Abdulhadi, Sadi Ibrahim Haruna Samir Bashir

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