Degradation of rock fracture asperities in unloading, reloading, and reversal

作者：Asadollahi Pooyan^*; Tonon Fulvio

来源：International Journal for Numerical and Analytical Methods in Geomechanics, 2011, 35(12): 1334-1346.

DOI：10.1002/nag.960

• constitutive model
• rock fractures
• Barton's empirical model
• unloading
• reloading
• degradation

Among the constitutive models for rock fractures developed over the years, Barton's empirical model has been widely used. Although Barton's failure criterion predicts peak shear strength of rock fractures with acceptable precision, it has some limitations in estimating the peak shear displacement, post-peak shear strength, dilation, and surface degradation. The first author modified Barton's original model in order to address these limitations.
Barton proposed his model for degradation of fracture asperities in unloading, reloading, and shear displacement reversal based on just one cyclic direct shear test. In this study, a database of results of 18 cyclic direct shear tests available in the literature was collected and analyzed. Modifications were made to Barton's original model (in terms of fracture cyclic shearing) to make it consistent with the modified model proposed by the first author.

• 出版日期2011-8-25