慢速和快速滑移下断层颗粒夹层的黏性特性

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中图分类号：0369 国标学科代码：13040 文献标志码：A

A study on the viscous characteristics of granular fault gouge under low and high slip rates

QI Chengzhi 1，2 ，WU Siyu12， BAN Liren12，LI Xiaozhao1²，KOCHARYAN Gevorg Grantovich³ （1. School of Civil and Transportation Engineering， Beijing University of Civil Engineering and Architecture，Beijing 100o44， China;

2.International Cooperation Base for Transportation Infrastructure Construction， Beijing University ofCivil EngineeringandArchitecture，Beijing1ooo44，China;

3.Sadovsky Institutefor Dynamics of Geosphere ofRussian Academy ofScience，Moscow119334，Russia）

Abstract：The viscous characteristics of granular fault gouge significantly impact thedynamic mechanical behaviorof faults， yetthe problemof determiningthe viscosityofthese interlayersatdiferent slipvelocities remainsunresolved.Thisarticle presents theoreticalresearch onthis isue.The Maxwellrelaxationmodel was employed to study theevolutionofforce chains in granular fault gouge during slow shearing of granular gouge，andthe dependence offorce chain length on shearstrain rate， efectiveextensionspeedofshear bands，andstrengthofthegranular medium was derived.Therelaxationtimeof theshear band in granular fault gouge，the expresson forthe viscositycoefficient of the granular medium，and the conditions for the transformation of solid-liquid mechanical behaviorof the granular medium were established.The validityof this model was verifiedthroughcomparison with existing experimentaldata.Forhigh-speed fault slip shear，themotionof thegranular mediumexhibits turbulent characteristics.Statistical physics wasused todescribethe interactionbetween granular particles in granularfault gouge，anditwasfoundthattheviscositycoeficientisinverselyproportional totheshearrateathighsliprates. Theresearch results have fundamental significance for understanding theviscous and other physico-mechanical properties of granular gouge in faults.

Keywords： viscosity; granular gouge; fault; slip velocity

按照萨道夫斯基的观点，地壳岩体被大大小小的不连续结构面切割，地壳岩体具有复杂的自相似内部结构层次。（剩余17680字）