An improved method of fitting experimental data to the Hoek-Brown failure criterion
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Dosyalar
Tarih
2012
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
In this study, a special fitting technique is proposed to apply the Hoek-Brown failure criterion to available laboratory strength data collected on samples of Ankara andesites. The original method of fitting the Hoek-Brown failure criterion using the spreadsheet and the fitting method utilized in the RocLab software are statistically compared with this new modified nonlinear fitting technique. The Hoek-Brown failure parameters obtained by a simple multiple regression technique, utilizing the solver function within an Excel spreadsheet and the revised least squares procedure significantly improved the fitness of the Hoek-Brown envelope especially within the tensile and high confining stresses. The Brazilian tensile strength is found to be a useful parameter to fix a rock failure criterion at low confining stresses, particularly, in the tensile region. If tensile, uniaxial and triaxial test results are available, when compared to two existing fitting methods the modified multiple regression method is found to predict more precise tensile and compressive strengths, and material constant m(i) for the Hoek-Brown failure criterion. (C) 2011 Elsevier B.V. All rights reserved.
Açıklama
Anahtar Kelimeler
Uniaxial Compressive Strength, Brazilian Tensile Strength, Normal Distribution, Least-square Curve Fitting, Hoek-Brown Failure Criterion, Ankara Andesite
Kaynak
Engineering Geology
WoS Q Değeri
N/A
Scopus Q Değeri
Q1
Cilt
127
