Microstructure effects on microcracking and brittle failure of dolomites

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• 作者：Hatzor ; Yossef. H. ; Zur ; Alon ; Mimran ; Yaakov
• 关键词：micromechanics ; brittle failure ; dolomites ; porosity ; grain size
• 刊名：Tectonophysics
• 出版年：1997
• 出版时间：November 30, 1997
• 年：1997
• 卷：281
• 期：3-4
• 页码：141-161
• 全文大小：2.04 M

文摘

In this paper the influence of microstructure on crack initiation stress and ultimate strength is investigated using results and analysis of 32 triaxial compression tests performed on cylindrical cores of dolomite samples which exhibit a wide range of grain sizes and mosaic textures. All tests were performed at a constant strain rate, under confining pressures between 0 to 40 MPa. The predictive capability of conventional criteria for ultimate strength which are based on empirical fitting parameters such as cohesion and internal friction angle, or mechanical properties such as unconfined compressive strength, is shown to be quite poor, due to the influence of microstructure. Microstructure controls ultimate strength to such a degree that an assumed mechanical property such as unconfined compressive strength may vary by more than a factor of two, where two different microstructure patterns are present.