期刊
ACTA GEOTECHNICA
卷 16, 期 2, 页码 551-567出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11440-020-01039-y
关键词
Anisotropic intact rock; Hoek-Brown criterion; Material parameter m(i); Minor principal stress; Strength; Stress-to-weak-plane angle
资金
- National Key Research and Development Program of China [2017YFC1501305]
- China Postdoctoral Science Foundation [2018M642799]
- Science and Technology Research Project of Hubei Education Department [D2019038]
- Open Foundation of Top Disciplines in Yangtze University
This study developed a relation for the anisotropy parameter m(i) of rock strength as a bivariate, second-order, polynomial function of the minor principal stress and the angle between the major principal stress and weak plane. The modified Hoek-Brown strength criterion showed improved ability to determine the strength of metamorphic and sedimentary rocks, based on the analysis of extensive uniaxial and triaxial compression test data from various rock types. Further research is needed to explore the applicability of this criterion to additional rock types.
The parameter m(i) accounts for the anisotropy of rock strength, and the accurate determination of m(i) is a primary requirement of the Hoek-Brown (H-B) strength criterion. In this study, a relation for m(i) as a bivariate, second-order, polynomial function of the minor principal stress (sigma (3)) and the angle (beta) between the major principal stress and weak plane is developed. First, the possible contribution of sigma (3) and beta to m(i) is systematically investigated based on substantial uniaxial and triaxial compression test data of various rock types collected from the available literature. This investigation allows m(i) to be described in terms of sigma (3) and beta. A self-defined fitting function is adopted to formulate the functional relationship among these metrics. Using this relation, the H-B strength criterion is modified, and its performance is evaluated in two examples. The examples illustrate the improved ability of the modified criterion to determine the strength of metamorphic and sedimentary rocks. The applicability of this criterion to additional rock types warrants further study.
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