The effect of mineral bond strength and adsorbed water on fault gouge frictional strength

被引：337

作者：

Morrow, CA ^{[1
]}

Moore, DE ^{[1
]}

Lockner, DA ^{[1
]}

机构：

[1] US Geol Survey, Menlo Park, CA 94025 USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2000年 / 27卷 / 06期

关键词：

D O I：

10.1029/1999GL008401

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Recent studies suggest that the tendency of many fault gouge minerals to take on adsorbed or interlayer water may strongly influence their frictional strength. To test this hypothesis, triaxial sliding experiments were conducted on 15 different single-mineral gouges with various water-adsorbing affinities. Vacuum dried samples were sheared at 100 MPa, then saturated with water and sheared farther to compare dry and wet:strengths. The coefficients of friction, mu, for the dry sheet-structure minerals (0.2-0.8), were related to mineral bond strength, End dropped 20-60% with the addition of water. For non-adsorbing minerals (mu = 0.6-0.8), the strength remained unchanged after saturation. These results confirm that the ability of minerals to adsorb various amounts of water is related to their relative frictional strengths, and may explain the: anomalously low strength of certain natural fault gouges.

引用

页码：815 / 818

页数：4

共 18 条

[1] HYDRATION-PHASE DIAGRAMS AND FRICTION OF MONTMORILLONITE UNDER LABORATORY AND GEOLOGIC CONDITIONS, WITH IMPLICATIONS FOR SHALE COMPACTION, SLOPE STABILITY, AND STRENGTH OF FAULT GOUGE [J].