Abstract
Hydraulic fracturing is an important destruction mode in the earth core rockfill dam engineering. In this paper, to explicit the mechanism of hydraulic fracturing and thus to verify the existing criterions, hydraulic fracturing tests were conducted based on true triaxial apparatus. Additionally, the precision of initial fracturing water pressure calculated by existing criterions is compared respectively. It is proved that the tensile strength and fracture initiation pressure pf all increase with the increasing of dry density. pf shows linear relationship with the minor principal stress σ3. The crack of hydraulic fracturing existed perpendicular to the minor principal stress plane. In addition, for T-S criterion, the predicted values are all less than the test data. On the contrary, most of the predicted values from M-C criterion are greater than the test data. Considering the safety of ECRD engineering, T-S criterion is suggested to predict the occurrence of hydraulic fracturing
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