Probabilistic estimate of rock mass static and dynamic demands for underground excavation stabilisation  

作　　者：Ernesto Villaescusa Alan Thompson Christopher Windsor 

机构地区：[1]Western Australia School of Mines,Curtin University,Locked Bag 30,Kalgoorlie,WA 6433,Australia [2]Alan Thompson Geotechnology Pty Ltd.,40B Windich Street,Esperance,WA 6450,Australia

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2019年第3期481-493,共13页岩石力学与岩土工程学报（英文版）

基　　金：financial assistance and support provided over many years by various organisations including CODELCO Chile, CRC Mining, Mining3, MMG, DSI and Geobrugg

摘　　要：Excavation damage under high in situ stress depends largely upon the potential block size associated with any violent ejection.The size and shape of the dynamic instability are largely controlled by the location,orientation and extent of the pre-existing geological discontinuities.A new methodology is presented in which the rock mass demand can be expressed in terms of the mass in tonnes of unstable rock that is ejected per unit area of the excavation surface where failure occurs.A probabilistic approach has been implemented to estimate the potential rock mass instabilities and their associated static and dynamic demands.The new methodology considers that the strain energy released by the rock mass during violent stress-driven failure is largely converted into kinetic energy of ejection for blocks.The estimated dynamic demand has been favourably compared with observations of rock mass damage in a number of underground excavations.Excavation damage under high in situ stress depends largely upon the potential block size associated with any violent ejection. The size and shape of the dynamic instability are largely controlled by the location, orientation and extent of the pre-existing geological discontinuities. A new methodology is presented in which the rock mass demand can be expressed in terms of the mass in tonnes of unstable rock that is ejected per unit area of the excavation surface where failure occurs. A probabilistic approach has been implemented to estimate the potential rock mass instabilities and their associated static and dynamic demands. The new methodology considers that the strain energy released by the rock mass during violent stress-driven failure is largely converted into kinetic energy of ejection for blocks. The estimated dynamic demand has been favourably compared with observations of rock mass damage in a number of underground excavations.

关 键 词：GEOLOGICAL structures PROBABILISTIC design UNDERGROUND EXCAVATIONS High stresses Dynamic and static DEMANDS Deep mining 

分 类 号：O3[理学—力学]