The accumulative deformation characteristics of mudded intercalations under cyclic dynamic loading

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (11) : 280-287.

YAN Changbin1, XU Xiao1, JIANG Xiaodi1, ZHANG Xiaoying2, CHEN Shuli2

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Abstract

The mudded intercalations are known to deteriorate engineering properties of layered rock mass. This work aimed to experimentally reveal the accumulative deformation characteristics and analyze the impact factors of mudded intercalations under cyclic dynamic loading. The specimens of mudded intercalations were collected from a geological adit of some large hydro project in the middle reaches of Yellow River. They were remolded and prepared for dynamic triaxial test under cyclic loading. Some key impact factors i.e. main clay mineral composition, clay content, water content, confining pressure and frequency were considered during dynamic triaxial tests with different conditions. A theoretical model was put forward for the cumulative strain description of mudded intercalations according to test results. The variation laws of dynamic elastic modulus with cyclic numbers were discussed based on the dynamic stress-strain curves. Research results show that the cumulative strain development laws of mudded intercalations have failure characteristics. They do not meet the stable cumulative strain characteristics. It is reasonable to describe the characteristics of cumulative strain by the Monismith model. The dynamic stress-strain curves accord with the Hardin hyperbolic model. The key impactors have great effects on the cumulative strain, such as cyclic numbers (positive), water content (positive), clay content (positive), frequency(positive), and confining pressure (negative) respectively. The dynamic elastic modulus is impacted by confining pressure (monotonously positive), cyclic time (monotonously negative), water content and frequency (monotonously negative) correspondingly. When the main mineral composition is mixed montmorillonite and illite, the cumulative strain of mudded intercalations reaches its maximum, and the dynamic elastic modulus decrease fastest.

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mudded intercalations / dynamic triaxial tests / cumulative strain models / dynamic elastic modulus / impact factors

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YAN Changbin1, XU Xiao1, JIANG Xiaodi1, ZHANG Xiaoying2, CHEN Shuli2. The accumulative deformation characteristics of mudded intercalations under cyclic dynamic loading[J]. Journal of Vibration and Shock, 2020, 39(11): 280-287

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