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Experimental investigation on frictional properties of stressed basalt fractures

Journal of Rock Mechanics and Geotechnical Engineering 2023年第6期15卷 1457-1475页

作者： Zhen Zhong Congqiang Xu Lei Wang Yunjin Hu Fengshou Zhang School of Civil Engineering Shaoxing UniversityShaoxing312000China Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province Shaoxing UniversityShaoxing312000China Department of Geotechnical Engineering College of Civil EngineeringTongji UniversityShanghai200092China Key Laboratory of Geotechnical&Underground Engineering of Ministry of Education Tongji UniversityShanghai200092China

The frictional strength and sliding stability of faults are crucial in interpreting earthquake mechanisms and ***,we report friction experiments on basalt fractures,using a self-designed triaxial apparatus that allows direct shear of samples under coupled hydro-mechanical ***(VS)and slide-hold-slide(SHS)experiments are performed on both bare and gouge-bearing surfaces of Xiashan basalt subjected to cyclic shear velocities at 1e30 mm/s,effective normal stresses of 1e5 MPa,and pore pressures of 70e300 *** measured basalt friction coefficients are in the range of 0.67e0.74,which is sensitive to gouge thickness,normal stress,and ***,a reduction in friction coefficient is observed with an increment in gouge thickness,normal stress,and pore *** on the microscopic observation of the pre-and post-shearing sliding surfaces,this weakening effect in friction coefficient can be attributed to powder ***,the VS test results reveal predominantly velocity-strengthening behavior at investigated slip velocities,and this velocity strengthening behavior does not appear to be influenced by variations in normal stress,gouge thickness,and ***,changes in sliding velocity and normal stress can lead to a shift between stable and unstable ***,stable sliding is favored by high sliding velocities and low normal stress applied in this ***,we analyze the experimental data by calculating the rate-and-state parameters using the rate-and state-dependent friction(RSF)***,the calculated friction rate parameter(a-b)supports the velocity-strengthening *** frictional relaxation(Dmc)during hold periods and frictional healing(Dm)upon re-shearing are linearly proportional to the logarithmic hold time,which may be attributed to the growth in true contact area with hold *** study sheds light on the roles of sliding velocity,and gouge thickness in controlling f

关键词： Rock friction Basalt fracture Gouge velocity-strengthening behavior Frictional healing

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