RESEARCH ON NONLINEAR CHARACTERISTICS OF ROCK ENERGY EVOLUTION UNDER UNIAXIAL COMPRESSION
ZHANG Zhizhen1,2,GAO Feng1,2
(1. State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining and Technology,Xuzhou,Jiangsu 221008,China;2. School of Mechanics and Civil Engineering,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China)
Abstract:Energy conversion during rock deformation and failure is a dynamic process,and it can be mainly divided into four subprocesses:energy input,energy accumulation,energy dissipation and energy release. Based on connection analysis of different energy conversion mechanisms,a self-repression model of energy transform with axial stress is founded;and the model is approved to be suited with the energy evolution in front of peak stress via experiments on red sandstone specimens. Energy density serials with axial stress follow standard Logistic mapping,and it is of the characteristics of bifurcation and chaos. When the axial stress reaches about 92% of peak stress,the rock system turns into period of doubling bifurcation region;and when 97.5% of peak stress,the rock system turns into chaos region. A parameter μ,called iterative growth factor,which is a monotonically increasing function of axial stress,is proposed;and a new warning criterion for rock failure,that is μ = 3,is brought out preliminarily.
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ZHANG Zhizhen1,2,GAO Feng1,2. RESEARCH ON NONLINEAR CHARACTERISTICS OF ROCK ENERGY EVOLUTION UNDER UNIAXIAL COMPRESSION. , 2012, 31(6): 1198-1207.
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