Due to the complex diagenesis process,basalt usually contains defects in the form of amygdales formed by diagenetic bubbles,which affect its mechanical properties.In this study,a synthetic rock mass method(SRM) based on the combination of discrete fracture network (DFN) and finite-discrete element method(FDEM) is applied to characterizing the amygdaloidal basalt,and to systematically exploring the effects of the development characteristics of amygdales and sample sizes on the mechanical properties of basalt.The results show that with increasing amygdale content,the elastic modulus (E) increases linearly,while the uniaxial compressive strength (UCS) shows an exponential or logarithmic decay.When the orien-tation of amygdales is between 0° and 90°,basalt shows a relatively pronounced strength and stiffness anisotropy.Based on the analysis of the geometric and mechanical properties,the representative element volume (REV) size of amygdaloidal basalt blocks is determined to be 200 mm,and the mechanical properties obtained on this scale can be regarded as the properties of the equivalent continuum.The results of this research are of value to the understanding of the mechanical properties of amygdaloidal basalt,so as to guide the formulation of engineering design schemes more accurately.

Zhenjiang Liu;Chunsheng Zhang;Chuanqing Zhang;Huabin Wang;Hui Zhou;Bo Zhou

School of Civil and Hydraulic Engineering,Huazhong University of Science and Technology,Wuhan,430074,China;PowerChina Huadong Engineering Corporation Limited,Hangzhou,310014,China;State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,430071,China;University of Chinese Academy of Sciences,Beijing,100049,China

岩石力学与岩土工程学报（英文版）

[1]Zhenjiang Liu;Chunsheng Zhang;Chuanqing Zhang;Huabin Wang;Hui Zhou;Bo Zhou-.Effects of amygdale heterogeneity and sample size on the mechanical properties of basalt)[J].岩石力学与岩土工程学报（英文版）,2022(01):93-107

amygdale,amygdales,amygdaloidal

Effects,heterogeneity,sample,mechanical,properties,basalt,Due,complex,diagenesis,process,usually,contains,defects,formed,by,diagenetic,bubbles,which,affect,its,In,this,study,synthetic,rock,mass,method,SRM,combination,discrete,fracture,network,DFN,finite,element,FDEM,applied,characterizing,systematically,exploring,effects,development,characteristics,sizes,results,that,increasing,content,elastic,modulus,increases,linearly,while,uniaxial,compressive,strength,UCS,shows,exponential,logarithmic,decay,When,orien,tation,between,relatively,pronounced,stiffness,anisotropy,Based,analysis,geometric,representative,volume,REV,blocks,determined,obtained,scale,can,regarded,equivalent,continuum,research,are,value,understanding,guide,formulation,engineering,design,schemes,more,accurately

0.542416