Abstract
Several post-earthquake investigations have indicated that the slope structure plays a leading role in the stability of rock slopes under dynamic loads. In this paper, the dynamic response of a horizontal layered-structure rock slope under harmonic Sv wave is studied by making use of the Fast Lagrangian Analysis of Continua method (FLAC). The suitability of FLAC for studying wave transmission across rock joints is validated through comparison with analytical solutions. After parametric studies on Sv wave transmission across the horizontal layered-structure rock slope, it is found that the acceleration amplification coefficient η, which is defined as the ratio of the acceleration at the monitoring point to the value at the toe, wavily increases with an increase of the height along the slope surface. Meanwhile, the fluctuation weakens with normalized joint stiffness K increasing and enhances with normalized joint spacing ξ increasing. The acceleration amplification coefficient of the slope crest ηcrest does not monotonously increase with the increase of ξ, but decreases with the increase of K. Additionally, ηcrest is more sensitive to ξ compared to K. From the contour figures, it can also be found that the contour figures of η take on rhythm, and the effects of ξ on the acceleration amplification coefficient are more obvious compared to the effects on K.
Highlights
It is widely recognized that the dynamic response of rock slopes is one of the key issues in geotechnical engineering and earthquake engineering, and there is indisputable evidence of its significance even from the late 1960s [1,2]
Research on wave propagation regularity in a layered-structure rock slope is important for assessing the stability and damage of rock slopes under dynamic loads
As many factors could influence the dynamic response of theand slope, a homogeneous and elastic rockAs slope with horizontal layered-structure, slope angle of of 30 m is and specified many factors could influence the dynamic response of◦30°, the slope,height a homogeneous elasticto rock slope with horizontal layered-structure, slope angle of
Summary
It is widely recognized that the dynamic response of rock slopes is one of the key issues in geotechnical engineering and earthquake engineering, and there is indisputable evidence of its significance even from the late 1960s [1,2]. The stability of rock slopes is often significantly influenced by the structural geology of the rock, especially discontinuities such as bedding planes, joints and faults [4]. Studies [5,6,7] have confirmed that the rock mass structure plays a leading role in the stability of rock slopes under dynamic loads. Research on wave propagation regularity in a layered-structure rock slope is important for assessing the stability and damage of rock slopes under dynamic loads. Many researchers have studied the dynamic response of rock slopes under stress and tried to simulate the complexity using analytical, numerical, model, and in situ test methods, and valuable conclusions about topography effects and dynamic response regularities have been drawn [8,9,10,11,12]
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