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Effect of mineralogy on friction-dilation relationships for simulated faults:Implications for permeability evolution in caprock faults

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Geoscience Frontiers 2020年第2期11卷 439-450页

作者： Fengshou Zhang Mengke An Lianyang Zhang Yi Fang Derek Elsworth Key Laboratory of Geotechnical&Underground Engineering of Ministry of Education Tongji UniversityShanghai 200092China Department of Geotechnical Engineering Tongji UniversityShanghai 200092China Department of Civil and Architectural Engineering and Mechanics University of ArizonaTucsonAZ85721USA nstitute for Geophysics Jackson School of GeosciencesThe University of Texas at AustinAustinTX78712USA Department of Energy and Mineral Engineering EMS Energy Institute and G3 CenterThe Pennsylvania State UniversityUniversity ParkPA16802USA Department of Geosciences The Pennsylvania State UniversityUniversity ParkPA16802USA

This paper experimentally explores the frictional sliding behavior of two simulated gouges:one,a series of quartz–smectite mixtures,and the other,powdered natural rocks,aiming to evaluate and codify the effect of mineralogy on gouge dilation and frictional strength,stability,and ***,velocity-stepping and slide-hold-slide experiments were performed in a double direct shear configuration to analyze frictional constitutive parameters at room temperature,under normal stresses of 10,20,and 40 *** dilation was measured based on the applied step-wise changes in shear *** frictional response of the quartz–smectite mixtures and powdered natural rocks are affected by their phyllosilicate *** strength and healing rates decrease with increasing phyllosilicate content,and at 20 wt.%a transition from velocity-weakening to velocity-strengthening behavior was *** both suites of gouges,dilation is positively correlated with frictional strength and healing rates,and negatively correlated with frictional *** in the permeability of gouge-filled faults were estimated from changes in mean porosity,indexed through measured magnitudes of gouge *** combined analysis implies that the reactivation of caprock faults filled with phyllosilicaterich gouges may have a strong influence on permeability evolution in caprock faults.

关键词： Fault gouge Mineralogy Strength and stability frictional healing Gouge dilation Permeability

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frictional behavior of quartz gouge during slide-hold-slide considering normal stress oscillation

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International Journal of Coal Science & Technology 2023年第3期10卷 108-121页

作者： Kang Tao Wengang Dang School of Civil Engineering Sun Yat-Sen UniversityZhuhai519086China Southern Marine Science and Engineering Guangdong Laboratory Zhuhai 519086China

Slide-hold-slide(SHS)test is an essential experimental approach for studying the frictional stability of *** origin SHS framework was established based on a consistent constant normal stress,which cannot truly reflect the stress disturbance around fault *** 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 *** experimental results reveal that the amplitude of the normal load oscillation has a remarkable effect on the frictional relaxation and healing ***,the frequency of the normal load oscillation has a minor ***,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 *** 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 *** study provides insights into the evolution of frictional stability in discontinuities and is beneficial for controlling relative disasters in fault zones.

关键词： Slide-hold-slide test Normal load oscillation frictional healing Fault stability

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Experimental investigation on frictional properties of stressed basalt fractures

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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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