Abstract
Based on fracture testing results for a cohesive soil, a new criterion for hydraulic fracturing in cohesive soil was suggested. From the criterion, the mechanism of hydraulic fracturing in a cubic soil specimen was investigated. The envelope-shaped crack prefabricated in the cubic soil specimen was propagated by increasing water pressure in the crack. The propagation of the crack may occur in mixed mode I-II or mode I. While the crack face is not perpendicular to any of the maximum, medium and minor principal stresses on the specimen surfaces, its propagation may occur in mixed mode I-II. But while the crack face is perpendicular to the minor principal stress, the crack is the most likely propagating one, and its propagation may occur in mode I.
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