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Variability of Mechanical Parameters of Rock Mass and Its Selection Method

LIU Gao1,2,LI Xin-zhao1,DENG Jian-li1,FU Qing-sheng1(1.School of Civil Engineering and Mechanics,Lanzhou University,Lanzhou 730000,China;2.Key Laboratory of Mechanics on Western Hazard and Environment,Lanzhou University,Lanzhou 730000,China)  
A reasonable selection of mechanical parameters of rock mass for a project is very hard,because the mechanical properties and the parameters have the remarkable characteristics of spatial and temporal variability due to rock mass structure and existing environments.Both the mechanical parameters and the rock mass quality reflect the mechanical properties from different aspects and are interrelated each other,but the latter can be determined more easily than the former,so it is feasible to select the mechanical parameters of rock masses through the estimated results of rock mass quality.Based on analysis of geological conditions of rock mass,rock masses space of a project can be divided into lots of continuous cells,whose rock mass quality can be easily given by such system as Q,RMR and BQ.The mechanical parameters of each cell can be calculated through the relationship between rock mass quality and mechanical parameters,for example the Hoek-Brown criterion.All the mechanical parameters of whole rock masses in a project space which reflects the spatial variability can be gotten by integrating the results of all cells.Take the underground works of a hydropower station as example,the mechanical parameters of surrounding rocks are gained using the methods mentioned as above.
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