Abstract
Abstract A discrete crack model of the strain accumulation of the Tangshan rhombic block, together with slip and stable extension of the earthquake fault prior to and during the 1976 Tangshan earthquake, is presented. It includes two processes: frictional slip along the crack and stable extension of the crack tips. The finite element technique i used to calculate stress and deformation along the crack surface and stress intensity factors at the crack tips, and the Mohr—Coulomb principle is applied to judge the existence of frictional slip along the crack surfaces and to determine the crack extension direction using the maximum circumferential tensile stress criterion. The similarity between the data predicted by the model and the data collected during the field survey indicates that the crack model has successfully simulated the process of strain accumulation and fracture propagation prior to and during the Tangshan earthquake.
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