Inference of behavior of Saturated Sandy Soils during Earthquakes from Laboratory Experiments

Tzou-Shin Ueng

《Journal of GeoEngineering》 1卷1期 (2006/08) Pp. 1-9

https://doi.org/10.6310/jog.2006.1(1).1

並列摘要

Laboratory experiments, including small soil element tests, centrifuge tests, and large 1 g shaking table tests have been performed for the study of sandy soil behavior before and after liquefaction. The understanding of this type of behavior is needed for development of a performance-based design for geotechnical structures under seismic loading. This paper attempts to infer the behavior of saturated sandy soils during an earthquake based on the experimental data from 1 g shaking table tests on clean sand in a large biaxial shear box, incorporated with the observations of the soil responses in experiments by others and field responses of in situ soils during large earthquakes. According to a postulate of water pressure transmission in a transient and nearly undrained condition, the soil responses, especially pore water pressure changes, at various locations can quickly affect the soil behavior at different depths and locations. Therefore, it is necessary to consider the seismic response of soils globally within all pertinent soil strata at different depths, not just that of a particular location, in order to fully understand the soil behavior of soils under earthquake loading. Some important implications and their significances are also discussed. Due to the drastic differences of soil behavior before and after liquefaction, the assessment of the state of the soil, liquefied or non-liquefied, is essential in the analysis and design of geotechnical structures.

並列關鍵字

saturated sandy soil ； water pressure ； liquefaction ； laboratory tests ； earthquake