Research Progress of Mechanical Characteristics and Constitutive Model of Rock under Unloading Condition

LI Jian-he; SHENG Qian; ZHU Ze-qi; NIU Li-min; RUAN Hang

doi:10.11988/ckyyb.20160388

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Journal of Changjiang River Scientific Research Institute ›› 2017, Vol. 34 ›› Issue (7) : 87-93. DOI: 10.11988/ckyyb.20160388

ROCK-SOIL ENGINEERING

Research Progress of Mechanical Characteristics and Constitutive Model of Rock under Unloading Condition

LI Jian-he^1,2, SHENG Qian¹, ZHU Ze-qi¹, NIU Li-min², RUAN Hang¹

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Abstract

In recent years, scholars have made plenty of researches on the mechanical characteristics and constitutive models of unloading rock through the unloading tests of rock specimen. Also, substantial achievements have been obtained. Compared with loading condition, rock performs differently in many aspects under unloading condition, such as strength characteristics, deformation regularities and failure modes. Unloading rock has significant tensile cracks and volume dilatation, and always performs as tensile-shear failure. Moreover, deformation and failure mechanism are impacted greatly by unloading speed, confining pressure and stress path. The constitutive models of unloading rock can be divided into phenomenological constitutive model and micro-mechanical constitutive model. The former does not consider the failure evolution mechanism of unloading rock, while the latter does not consider the micro crack groups and the error caused by mathematical simplification. These scientific problems make the future of unloading rock mechanics research work full of opportunities and challenges.

Key words

rock mechanics / unloading test / deformation feature / fracture characteristics / constitutive model

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LI Jian-he, SHENG Qian, ZHU Ze-qi, NIU Li-min, RUAN Hang. Research Progress of Mechanical Characteristics and Constitutive Model of Rock under Unloading Condition[J]. Journal of Changjiang River Scientific Research Institute. 2017, 34(7): 87-93 https://doi.org/10.11988/ckyyb.20160388

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