Sources of variability in laboratory rock test results  

作　　者：Rashid Geranmayeh Vaneghi Seyed Erfan Saberhosseini Arcady VDyskin Klaus Thoeni Mostafa Sharifzadeh Mohammad Sarmadivaleh 

机构地区：[1]WA School of Mines:Minerals,Energy and Chemical Engineering,Curtin University,Kalgoorlie,WA,6430,Australia [2]Northern Star Resources,Kalgoorlie,WA,6430,Australia [3]Science and Research Branch,Islamic Azad University,Tehran,Iran [4]School of Civil,Environmental and Mining Engineering,The University of Western Australia,Crawley,WA,6009,Australia [5]Centre for Geotechnical Science and Engineering,The University of Newcastle,Callaghan,NSW,2308,Australia [6]WA School of Mines:Minerals,Energy and Chemical Engineering,Curtin University,Kensington,Perth,WA,6151,Australia

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2021年第5期985-1001,共17页岩石力学与岩土工程学报（英文版）

基　　金：the Curtin Strategic International Research Scholarship(CSIRS)and Mining Research Institute of Western Australia(MRIWA)-project M474 scholarship;the Australian Research Council through project DP190103260.

摘　　要：Appropriate rock characterization is beneficial in providing a reliable judgment on rock properties which is crucial for the design process of rock engineering applications.However,it can be difficult to obtain consistent mechanical parameters due to substantial variations in rock properties.In this research,uniaxial compression tests on dolerite specimens collected from a gold mine in Western Australia showed substantial scatter in the results.Rock categorization based on the P-wave velocities is as accurate as the thin section analysis,which suggests that they can be used together to gain a more accurate initial understanding of the rock types before any laboratory testing.The quality of specimen preparation and rockemachine interaction greatly affect the test results.For instance,non-parallelness of loading platens can lead to considerable scatter of the testing results,which would be perceived as rock variability.It is suggested that the current testing standards should be modified towards a better control of the loading machine performance and equipment precision.Finally,the possibility of pre-existing microcracks in rock,neither detected by the thin section analysis nor by the ultrasonic measurement,must be examined by computed tomography(CT)scanning as they can affect the test results.This study will enhance our knowledge about the sources of variability in laboratory test results of rock which is essential for obtaining reliable data.

关 键 词：Rock property variation Uniaxial compressive strength(UCS) Specimen preparation End flatness Loading equipment precision Pre-existing microcrack 

分 类 号：TU45[建筑科学—岩土工程]