January 2024
·
3 Reads
This page lists works of an author who doesn't have a ResearchGate profile or hasn't added the works to their profile yet. It is automatically generated from public (personal) data to further our legitimate goal of comprehensive and accurate scientific recordkeeping. If you are this author and want this page removed, please let us know.
January 2024
·
3 Reads
May 2023
·
139 Reads
·
6 Citations
In this study, the seismic response and liquefaction mitigation effect of the soil-cement grid improved ground subjected to large earthquake loadings are studied through dynamic centrifuge tests. The model tests included soil-cement grid improved and unimproved model grounds, both of which have a 15-m-thick liquefiable layer underlain by a 2.5-m-thick coarse sand layer. The pre-cast soil-cement grid adopted in this study enables the dynamic responses of the model closer to the real improved ground. The recorded responses of accelerations, excess pore pressures and the deformation of the enclosed soil in the improved ground were carefully analysed with the comparison of the ground without improvement. It shows that the soil liquefaction and post-shaking settlements were effectively mitigated by the soil-cement grid even under very strong shakings. And the restriction effect of the soil-cement grid on dynamic shear strain of the enclosed soil was the most prominent in the middle height, regardless of the intensities of the shaking events. Such mitigating “waist effect” could mainly be attributed to the dynamic soil-grid interaction during shaking. However, the underlain soil layer may experience larger shear strain due to the increasing inertial force of the overlying ground improved by the soil-cement grid.
June 2020
·
67 Reads
·
16 Citations
Géotechnique Letters
Liquefaction of silty sands remains puzzling due to the complexity involved in the interaction between coarse and fine particles during loading. This paper presents first-hand experimental data from a series of cyclic triaxial tests under controlled particle characteristics, with the aim to elucidate the influence of particle-size disparity on the liquefaction resistance of sand−fines mixtures. A detailed analysis of the test results and an experimental database compiled from the literature reveal that the particle-size disparity, defined as the ratio between the characteristic sizes of the base sand and the fines, is a major and rational factor controlling the reduction of cyclic resistance of sand−fines mixtures as compared with factors such as the grading and shape of the base sand. A simple, explicit expression is further proposed to properly account for the reduction of cyclic resistance of sand due to fines.
... Previous studies have assessed the impact of shear strain restraint methods, such as deep soil mixing (DSM) columns and grids, on consequences of soil liquefaction, focusing on performance in the absence of structure, both experimentally (e.g., Madabhushi 2011, 2013;Khosravi et al. 2016;Cao et al. 2023;Watanabe et al. 2023) and numerically (Namikawa et al. 2007;Xu et al. 2013;Bradley et al. 2013;Nguyen et al. 2013;Rayamajhi et al. 2014;Hasheminezhad and Bahadori 2019). ...
May 2023
... Besides fines content, the influence of grading features of fines and coarse particles can also affect the cyclic resistance of silty sands. For example, in the case of sand-dominated silty sands (f c < f thre ), Wei et al. (2020) reported a comprehensive study based on a specifically designed experimental programme along with literature data analysis of different mixtures. It was found that a more reduction in CRR at the same f c is expected with increasing particle diameter ratio χ (i.e. the ratio D 10 / d 50 between the diameter of sand grains at which 10% of sample is finer and the mean particle diameter of fines). ...
June 2020
Géotechnique Letters