A Rock Damage Constitutive Model Based on Distortion Energy Theory

LIU Zhi-xi; LUO Ji-an

doi:10.11988/ckyyb.20180775

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Journal of Changjiang River Scientific Research Institute ›› 2020, Vol. 37 ›› Issue (1) : 137-141. DOI: 10.11988/ckyyb.20180775

ROCKSOIL ENGINEERING

A Rock Damage Constitutive Model Based on Distortion Energy Theory

LIU Zhi-xi¹, LUO Ji-an²

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Abstract

Constitutive model of rock damage under loading and unloading is the key to predict the long-term stability of pressure storage tank. Since pressure on surrounding rock changes repeatedly, few constitutive models can be applied at present. The micro-unit strength of rock obeys the distortion energy strength and the Weibull random distribution. In the light of this, we present a damage constitutive model which could describe the staged loading and unloading of rocks. Furthermore, we verified the constitutive model by experiments, analyzed the sensitivity of constitutive parameters according to test data, determined the physical significance of parameters and selected parameters which could reflect the staged loading and unloading. The physical meaning of damage constitutive model parameters is clear and easy to fit, suitable for practical engineering.

Key words

rock mechanics / distortion energy theory / Weibull random distribution / staged loading and unloading / constitutive model

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LIU Zhi-xi, LUO Ji-an. A Rock Damage Constitutive Model Based on Distortion Energy Theory[J]. Journal of Changjiang River Scientific Research Institute. 2020, 37(1): 137-141 https://doi.org/10.11988/ckyyb.20180775

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