Influence of bidirectional shaking on pore water pressure generation for liquefaction triggering evaluation
學年 112
學期 2
發表日期 2024-05-07
作品名稱 Influence of bidirectional shaking on pore water pressure generation for liquefaction triggering evaluation
作品名稱（其他語言）
著者 Cheng-Hsu Yang; Yu-Wei Hwang; Wenyang Zhang; Der-Wen Chang; Kuo-Hsin Yang
作品所屬單位
出版者
會議名稱 The 8th Int. Conf. on Earthquake Geotechnical Engineering
會議地點 Osaka, Japan
摘要 Over the past years, prior research has shown that bidirectional horizontal shaking can increase seismic settlements in dry sand, the buildup of excess pore water pressures in saturated granular soils, and the liquefied depth. However, the state of practice for either simplified liquefaction triggering procedures or numerical/experimental seismic simulation is typically for one-dimensional (1D) conditions, without considering the impact of bidirectional horizontal shaking on soil deposits with stratigraphic variabilities. In this paper, three-dimensional (3D), fully-coupled, nonlinear finite element analyses are used to evaluate how bidirectional horizontal shaking affects the seismic response of layered liquefiable soil deposits. The two horizontal components of each selected motion were rotated to find the maximum rotated (RotD100) peak ground acceleration (PGA). The two horizontal components and the RotD100 component were subjected to the base of each 3D soil column model, to represent the site response analysis under bidirectional (BD) and 1D shaking, respectively. The numerical results showed that the BD shaking and pore water pressure migration increased the excess pore water pressure (EPWP) buildup in soils, particularly for medium-dense and dense soils. This led to an increase in liquefied depth when the soil deposits were under moderate-intensity shaking, as compared to the model under 1D shaking or evaluated by the simplified liquefaction triggering procedure. For the case considered, the BD shaking amplified the maximum excess pore water pressure ratio by about 1.3 times on average (with a standard deviation of 0.3) compared to that under 1D shaking, particularly for PGA ranging from 0.002~0.3g. However, the impacts of BD shaking on the EPWP generation became minor when PGA was greater than 0.3g. These results indicated that the impact of bidirectional shaking on the seismic response of porous media must be considered with extreme care when assessing the risk of liquefaction.
關鍵字 earthquake;liquefaction;bidirectional shaking;one-dimensional shaking;site response analysis
語言 en
收錄於
會議性質 國際
校內研討會地點 無
研討會時間 20240507~20240510
通訊作者
國別 JPN
公開徵稿
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機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/126185 )

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