dc.description.abstract | Sheet pile wall system has been widely employed in excavation, waterfront structure, and retaining structure with the outstanding advantages of low expenses, favorable in construction, and reusability. Besides, Taiwan locates at the active seismic zones that the earthquakes occur regularly. Therefore, a series of centrifuge tests in this research was conducted to study the behavior of the sheet pile wall at the riverside subjected to dynamic loading. In this research, the sheet piles were made of aluminum alloy. The model was constructed by a pluviation method with fine quartz sand, which has a relative density of 70%. The bending moment was measured by several strain gauges attached along with the pile. Two LDTs were installed to observe the lateral displacement and the rotation of the wall. The surface settlement was detected by using LVDTs and a laser scanning device.
The results indicated that the displacement and the tilting angle stayed in the safety zone in the wall without anchors in the case of seismic loading of 0.16 g. The maximum settlement measured by both LVDTs and a laser scanning device was located at 0.04H behind the wall and 0.1H behind the anchor plates (where H is the excavation depth). In the wall without anchors, the lateral displacement and tilting angle closed to the threshold of the near-collapse range that the wall needs to repair after the earthquake. For the seismic loading of 0.33 g and 0.45 g, in the single anchored wall and double anchored wall with the anchor tie rod distance is double of the single anchored wall, the walls collapsed at the seismic loading of 0.33 g. Otherwise, in the double anchored walls with the same anchor tie rod distance of the single anchored wall, even subjected to the severe earthquake (seismic loading of 0.45 g), the wall still sustains. Besides, using a double anchored wall would reduce half of the bending moment as compared single anchored wall. Using a double anchored wall with anchor distance is a double of a single anchored wall, the lateral displacement, tilting angle, bending moment, the backfilled settlement was one third compared to the single anchored wall. In engineering practice, arranging the anchor tie rods as double anchored walls and increasing the number of anchor tie rods can improve the stability of the walls.
| en_US |