首页|Experimental study on the influence of hydrostatic stress on the Lode angle effect of porous rock

Experimental study on the influence of hydrostatic stress on the Lode angle effect of porous rock

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To investigate the deformation mechanisms of rock under hydrostatic stress,destructive experiments were conducted on sandstone under different levels of hydrostatic stress and stress Lode angles.The results reveal that the shape of the strength envelope on the π plane gradually changes from the shape of the Lade criterion to the shape of the Drucker-Prage criterion with an increase in hydrostatic stress.Normally,there exists a deviation between the strain and stress paths for porous rocks on the k plane,and the deviation decreases with an increase in stress Lode angle and hydrostatic stress.A rock failure hypothesis based on the rock porous structure was proposed to investigate the reasons for the above-mentioned phenomena.It was found that the shear expansion in the minimum principal stress direction is the dominant factor affecting the Lode angle effect(LAE);the magnitude of the hydrostatic stress induces the variation of the porous structure and influences the shear expansion.Therefore,the hydro-static stress state affects the LAE.The failure hypothesis proposed in this paper can clarify the hydrostatic stress effect,LAE,and the variation of the rock strength envelope shape.

Lode angle effectHydrostatic stress effectStrength envelope curvePorous structure

Zhenlong Song、Zhenguo Zhang、P.G.Ranjith、Wanchun Zhao、Chao Liu

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Department of Earth and Space Sciences.Southern University of Science and Technology,Shenzhen,Guangdong 518055,China

State Key Laboratory of Coalmine Disaster Dynamics and Control,Chongqing University,Chongqing 400030,China

Deep Earth Energy Research Laboratory,Department of Civil Engineering,Monash University,Melbourne,Victoria 3800,Australia

School of Earth and Space Sciences,University of Science and Technology of China,Hefei 230026,China

School of Electrical Engineering & Information.Northeast Petroleum University,Daqing 163318,China

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2022

矿业科学技术学报(英文版)
中国矿业大学

矿业科学技术学报(英文版)

CSTPCDCSCDSCIEI
影响因子：1.222
ISSN：2095-2686
年,卷(期)：2022.32(4)
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