The effect of mineral bond strength and adsorbed water on fault gouge frictional strength
The effect of mineral bond strength and adsorbed water on fault gouge frictional strength
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DOI：
10.1029/1999gl008401
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发表时间：
2000-03-15
影响因子：
5.2
通讯作者：
Lockner, DA
中科院分区：
文献类型：
--
作者：
Morrow, CA;Moore, DE;Lockner, DA
最近的研究表明，许多断层泥矿物吸附水或层间水的倾向可能强烈影响其摩擦强度。为了验证这一假设，三轴滑动实验进行了15个不同的单矿物泥与各种吸水亲和力。将真空干燥的样品在100 MPa下剪切，然后用水饱和并进一步剪切以比较干强度和湿强度。干燥片状结构矿物的摩擦系数μ（0.2-0.8）与矿物结合强度有关，加水后摩擦系数下降20-60%。对于非吸附性矿物（mu = 0.6-0.8），饱和后强度保持不变。这些结果证实了矿物吸附不同量水的能力与它们的相对摩擦强度有关，并可以解释某些天然断层泥的强度极低的原因。
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.