Frictional behavior of quartz gouge during slide-hold-slide considering normal stress oscillation
Kang Tao1
Wengang Dang2
1.School of Civil Engineering,Sun Yat-Sen University,Zhuhai 519086,China2.School of Civil Engineering,Sun Yat-Sen University,Zhuhai 519086,China;Southern Marine Science and Engineering Guangdong Laboratory,Zhuhai 519086,China
摘要：Slide-hold-slide(SHS)test is an essential experimental approach for studying the frictional stability of faults.The origin SHS framework was established based on a consistent constant normal stress,which cannot truly reflect the stress disturbance around fault zones.In this paper,we conducted a series of'dynamic SHS tests',which includes normal stress oscillations in the relaxation stage with different oscillation amplitudes and frequencies on synthetic quartz gouge using a double direct shear assembly.The experimental results reveal that the amplitude of the normal load oscillation has a remarkable effect on the frictional relaxation and healing patterns.However,the frequency of the normal load oscillation has a minor effect.Additionally,the shear loading rate is proportional to the normal loading rate during the relaxation stage,and the normal stiffness of the quartz layer remains nearly constant under various loading conditions.The creep rate during the hold phase is not obviously affected by the normal load oscillation,while the precursory slip is also sensitive to the oscillation ampli-tude.This study provides insights into the evolution of frictional stability in discontinuities and is beneficial for controlling relative disasters in fault zones.
机标关键词：behaviorslidestressquartznormalconsideringduringfrictional
论文发表日期：2023-06-28
在线出版日期：2025-08-15（本平台首次上网日期，不代表文献的发表时间）
页数：14( 108-121 )
英文信息