Triaxial Creep Behaviour of Limestone under Graded Confining Pressure Unloading
Journal Title: GeoStruct Innovations - Year 2024, Vol 2, Issue 3
Abstract
The stability of rock masses in large-scale hydropower projects and high-slope excavation engineering is significantly influenced by the unloading of confining pressure. This study investigates the triaxial creep behaviour of limestone under varying conditions of confining pressure unloading through systematic experimental research. Using a ZYSS2000C triaxial shear rheometer, limestone samples from the Qinling region were subjected to a series of triaxial creep tests with controlled unloading conditions. Experimental setups included varying single-step unloading magnitudes of confining pressure (2 MPa, 4 MPa, and 6 MPa) under constant axial stress. The results demonstrated that the magnitude of confining pressure unloading had a pronounced impact on creep behaviour. Larger unloading magnitudes led to shorter total creep durations and reduced cumulative deformation, highlighting the pivotal role of unloading intensity in governing creep characteristics. During the unloading creep process, the deviatoric stress of the rock decreased, and the deformation predominantly manifested as radial dilation. These findings provide new insights into the rock deformation mechanisms induced by confining pressure unloading and offer valuable theoretical and practical guidance for slope excavation and stability management.
Authors and Affiliations
Boning Zhang, Shiwei Shen
Keywords
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- EP ID EP752460
- DOI https://doi.org/10.56578/gsi020301
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