期刊
ACTA GEOTECHNICA
卷 16, 期 7, 页码 2291-2299出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11440-021-01145-5
关键词
Fracture mechanics; Progressive failure; Shales; Shear band; Slip surfaces; Stiff clays
资金
- Research Grants Council of Hong Kong through the Early Career Scheme [27205918]
- General Research Fund [17201419]
- NSFC/RGC Joint Research Scheme [N_CUHK430/16]
This study characterizes and analyzes the shear fracture energies and characteristic slip displacements of stiff clays and shales, showing that they generally increase with the effective normal stress on the slip plane.
Fracture mechanics analysis of shear band propagation requires knowledge of the material's shear fracture energy and its related properties such as the characteristic slip displacement. Yet these properties of stiff clays and shales have not been investigated systematically. This work characterizes and analyzes the shear fracture energies and characteristic slip displacements of various stiff clays and shales based on their triaxial compression data from the literature. A methodology originally developed for hard rocks was adopted for this purpose. Results show that the shear fracture energies of stiff clays and shales generally increase with the effective normal stress on the slip plane, varying by orders of magnitudeapproximately from 4 x 10(1) to 7 x 10(3) J/m(2)-in the range of effective normal stresses from 10(2) to 10(5) kPa. An empirical equation is presented for a first-order estimate of the shear fracture energy under a given effective normal stress. The characteristic slip displacements at the laboratory scale are calculated to be smaller than 6 mm, and they appear independent of the effective normal stress. Compared with their nominal values calculated without considering the change of normal stress in triaxial tests, the shear fracture energies are approximately 70% of the nominal values, whereas the characteristic slip displacements are nearly identical to the nominal ones.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据