Dynamic characteristics of marine soft clay under variable phase difference and initial static shear stress. Issue 7 (8th August 2020)

• Record Type: Journal Article
• Authors: Dong, Wenqian; Hu, Xiuqing; Zhang, Yan; Fu, Hongtao
• Is Part Of: Marine georesources & geotechnology. Volume 38:Issue 7(2020)
• Page Start: 770
• Page End: 785
• Publication Date: 2020-08-08
• Subjects: Initial shear stress -- phase difference -- marine soft clay -- shear strain -- cyclic strength; Marine mineral resources -- Periodicals; 551.46
• DOI: 10.1080/1064119X.2019.1622159
• Languages: English
• ISSNs: 1064-119X

Abstract

Abstract: Under seismic loading, the soil layer is subjected to multidirectional cyclic shear stress with different amplitudes and frequencies because of the coupling of multiple shear waves and the soil element within a slope or behind a retaining wall is subjected to initial static shear stress before subjected to cyclic loading. Due to the complexity of seismic loading propagation, a phase difference exists between the initial static shear stress and cyclic shear stress. To investigate the influence of the phase difference and initial static shear stress on cyclic shear strain, cyclic modulus, and cyclic strength, a series of laboratory tests are performed on Wenzhou marine soft clay by multi-directional simple shear system, which can simulate the actual state better by controlling the horizontal cyclic stress in the x and y directions simultaneously. As the phase difference varies from 0° to 90°, the dynamic shear modulus increases and cyclic strain accumulation decreases with an increasing number of cycles. The shear strain increases with the initial shear stress.