The frictional sliding properties of antigorite gouge under hydrothermal conditionsOA
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 1.0μm/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°C,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 above400℃,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.
Shimin Liu;Mengke An;Wenhao Dai;Huiru Lei;Lei Zhang;Yongsheng Zhou;Zekang Yang
School of Fire Protection Engineering,China People''s Police University,Langfang,065000,China State Key Laboratory of Earthquake Dynamics and Forecasting,Institute of Geology,China Earthquake Administration,Beijing,100029,ChinaDepartment of Civil and Environmental Engineering,The Hong Kong Polytechnic University,Hong Kong,100872,ChinaState Key Laboratory of Earthquake Dynamics and Forecasting,Institute of Geology,China Earthquake Administration,Beijing,100029,China Jiangxi Earthquake Agency,Nanchang,330026,ChinaState Key Laboratory of Earthquake Dynamics and Forecasting,Institute of Geology,China Earthquake Administration,Beijing,100029,ChinaState Key Laboratory of Earthquake Dynamics and Forecasting,Institute of Geology,China Earthquake Administration,Beijing,100029,ChinaState Key Laboratory of Earthquake Dynamics and Forecasting,Institute of Geology,China Earthquake Administration,Beijing,100029,ChinaState Key Laboratory of Earthquake Dynamics and Forecasting,Institute of Geology,China Earthquake Administration,Beijing,100029,China
天文与地球科学
AntigoriteFriction coefficientVelocity dependenceSteady slidingPore fluid pressure
《Rock Mechanics Bulletin》 2026 (2)
P.148-156,9
supported by the Langfang Science and Technology Research and Development Program(Grants No.2024013158)funded by the Langfang Science and Technology Bureau and the National Natural Science Foundation of China(Grants No.42494862)。
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