慢速和快速滑移下斷層顆粒夾層的黏性特性

打開文本圖片集

中圖分類號：0369 國標學科代碼：13040 文獻標志碼：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

按照薩道夫斯基的觀點，地殼巖體被大大小小的不連續(xù)結(jié)構(gòu)面切割，地殼巖體具有復雜的自相似內(nèi)部結(jié)構(gòu)層次。（剩余17680字）