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NON-LINEAR CREEP MODEL AND STABILITY ANALYSIS OF ROCK
岩石试件非线性蠕变模型及其稳定性分析

Keywords: rock mechanics,non-linear creep,stability,creep instability
岩石力学
,非线性蠕变,稳定性,蠕变失稳,应变曲线

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Abstract:

Based on the modified elastic and visco-elasto-plastic model,the corresponding relationship of complete rock stress-strain curve and creep equation parameters is utilized,and a creep model with non-linear parameters is set up. By analyzing non-linear creep model and the creep curve,in the local scope,non-linear creep question is transfered into linear one,and the stability condition of the modified model is obtained,with which the three stages of rock sample creep,especially the non-linear accelerating creep stage can be described clearly. Meantime,the creep stability criteria of rock sample,analytic expressions of the creep deformation,the creep speed and the creep acceleration are given.

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