Analysis of Shear Characteristics of Deep, Anchored Rock Mass under Creep Fatigue Loading

To study the influence of earthquakes and engineering disturbances on the deformation of deeply buried rock masses, shear tests were carried out on anchored sandstone rock masses, anchored marble rock masses, and anchored granite rock masses under creep fatigue loading, and a new creep fatigue model...

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Bibliographic Details
Published in:Advances in civil engineering 2021, Vol.2021 (1)
Main Authors: Li, Xiaofeng, Yin, Zhixiang
Format: Article
Language:English
Subjects:
Attenuation
Cement
Civil engineering
Creep fatigue
Creep tests
Deformation
Earthquakes
Fatigue tests
Fractals
Geology
Marble
Mechanical properties
Metal fatigue
Model testing
Rheology
Rock masses
Rocks
Sandstone
Seismic activity
Seismic engineering
Shear modulus
Shear stress
Shear tests
Steady state creep
Stone
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Summary:To study the influence of earthquakes and engineering disturbances on the deformation of deeply buried rock masses, shear tests were carried out on anchored sandstone rock masses, anchored marble rock masses, and anchored granite rock masses under creep fatigue loading, and a new creep fatigue model was established to characterize the deformation characteristics of anchored rock masses under creep fatigue loading. The creep fatigue curves of different lithologies clearly show three stages: creep attenuation, steady-state creep, and accelerated creep. Fatigue loading can increase the creep of anchored specimens, and the lower the rock strength is, the higher the creep variable under fatigue loading is. However, for the same rock strength, with the increase in load level, the creep variable produced by creep fatigue load presents a linear downward trend. Considering the changes in the mechanical properties of the anchored rock mass under creep fatigue loading, the creep fatigue model of anchored rock masses is established by introducing a function of the fatigue shear modulus, and the accuracy and applicability of the model are verified by laboratory creep fatigue test data. The model provides a theoretical basis for the study of anchored rock mass support under low-frequency earthquakes or blasting loads.
ISSN:1687-8086
1687-8094
DOI:10.1155/2021/2326237