Effect of Porosity on Rock Brittleness

被引：90

作者：

Heidari, M. ^{[1
]}

Khanlari, G. R. ^{[1
]}

Torabi-Kaveh, M. ^{[1
]}

Kargarian, S. ^{[1
]}

Saneie, S. ^{[1
]}

机构：

[1] Bu Ali Sina Univ, Fac Sci, Dept Geol, Hamadan 6517538695, Iran

来源：

ROCK MECHANICS AND ROCK ENGINEERING | 2014年 / 47卷 / 02期

关键词：

Brittleness index; Porosity; Uniaxial compressive strength; Brazilian tensile strength; Point load strength index; COMPRESSIVE STRENGTH; INDEX; TBM;

D O I：

10.1007/s00603-013-0400-0

中图分类号：

P5 [地质学];

学科分类号：

0709 ; 081803 ;

摘要：

The article examines the influence of porosity on the brittleness of eight types of rocks. Laboratory core drill and saw machines were used to prepare cylindrical specimens with diameters of 56.70 mm, but with variable length-to-diameter ratios (L/D). The ends of the cores were smoothed to within 0.02 mm, and perpendicularity was kept within a limit of 0.05 mm. Brittleness is a complex function of lithology, composition, temperature, porosity. Brittle rocks, particularly crystalline rocks, have low strain at failure, while soft rocks could have relatively high strain at failure. Porosity is one of the governing factors on rock strain. Increase in the rock porosity leads to increase of its strain at failure, and finally decrease in its brittleness. It may be reliable for a rock with low mineralogical variety but that is not the only reason to reduce brittleness in crystalline igneous, metamorphic and some of the sedimentary rocks with high mineralogical variety.

引用

页码：785 / 790

页数：6

共 31 条

[1] The porosity and engineering properties of vesicular basalt in Saudi Arabia [J].