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Study on creep dynamic characteristics of sedimentary rocks with a new test device

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Document pages: 13 pages

Abstract: Under high stress, the rock in creep state is easy to be affected by external impact load, resulting in irreversible disturbance deformation and even sudden failure of the rock. In order to explore the dynamic characteristics of sedimentary rocks under creep, a new rock creep perturbation experimental system was used to study the siltstone samples. Compared with the available rock dynamics research equipment, this new experimental system provides long-term stable high static stress to maintain the creep state of rock samples. This is independent of the power supply because it provides static stress through gravity load. In addition, the device provides dynamic impact load through the free fall of impact weight. This study shows that perturbation deformation of sedimentary rock increased in two stages: decay phase and sustained development phase. When the static stress reached up to ~85 of the rock’s ultimate strength and the axial strain reached up to 80 of the ultimate failure strain, the rock became sensitive to impact load. This static stress level is basically the same as its long-term strength. With increasing impact strength, the increment curve of the rock creep perturbation deformation was transformed from the decay phase to the sustained development phase in advance, making the rock sensitive to external perturbation at a low static loading stress level.

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