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岩石力学通报（英文）
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2026年2期
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The frictional sliding properties of antigorite gouge under hydrothermal conditions
The frictional sliding properties of antigorite gouge under hydrothermal conditions
摘要
As a weak mineral overlying subduction-zone faults,the widespread presence of antigorite can markedly affect subduction-zone dynamics.To better understand the mechanical properties of antigorite-bearing faults,we conducted frictional sliding experiments on antigorite under hydrothermal conditions.The experimental setup involved a constant confining pressure of 100 MPa,a low pore fluid pressure of 30 MPa,and temperatures ranging from 100 ℃ to 500 ℃.We varied the axial loading rate between 0.04,0.2,and 1.0 μm/s to examine the velocity dependence of the friction coefficient.The results showed that the friction coefficient of antigorite exhibited a significant temperature dependence.Between 100 ℃ and 400 ℃,the friction coefficient decreased from 0.66 to 0.54 as the temperature increased.Above 400 ℃,the friction coefficient increased,reaching 0.7.The velocity dependence of antigorite exhibited velocity strengthening(a-b＞0)throughout the entire experimental temperature range(100 ℃-500 ℃).The impact of pore-fluid pressure on the frictional behavior of antigorite was also significant.Under low pore-fluid pressure(30 MPa),the frictional strength increases above 400 ℃,associated with dehydration hardening.In contrast,at high pore fluid pressure,frictional weakening continues at elevated temperatures,indicating that pore fluid pressure plays a crucial role in regulating the frictional stability of antigorite.Our experimental results demonstrate that the pore fluid pressure plays a key role in regulating the temperature-dependent frictional behavior of antigorite,highlighting the need for further investigation under varying fluid pressure conditions.
年，卷(期)：
2026, 5(2)
机标分类号：
S
TG146.2
O152.1
在线出版日期：
2026年6月24日
