关键词: 桩板墙, 锚索桩板墙, 振动台试验, 响应特性, 对比分析

Abstract: Investigations into damaged geotechnical structures after earthquakes reveal that the sheet pile wall has good seismic performance, especially reinforced by anchor cables. However, the research about sheet pile wall mostly focuses on its behavior under static conditions at present, while scarce achievements on dynamic response and seismic working mechanism yet. The comparative study of seismic response characteristics regarding two types of sheet pile wall, namely sheet pile wall and anchored sheet pile wall, has not been reported in literatures. In this paper, sheet pile wall and anchored sheet pile wall are tested in a large scale shaking table test, and dynamic characteristics of these two types of structures are analyzed. The experiment results show that the dynamic responses of time histories of earth pressures, anchor cable tensions, and displacements of pile from these two types of structures are closely relate to input seismic parameter characteristics, e.g. curve shape and variation trend. The occurrence time between peak value and peak ground acceleration is consistent. The installment of anchor cables can stabilize slope and restrict displacement of pile efficiently, especially in high seismic intensity zones where soil nonlinearity increases. Prestressed anchor cables can constrain displacement of pile. The displacement of sheet pile wall is 2.4 times of displacement of anchored sheet pile wall when the seismic coefficient reaches 0.4. The application of prestress in anchor cables can generate pseudo-active counter pressure from pile to soil, resulting in increased internal force in cantilever segment. Under the conditions of static loading and 0.1 of seismic coefficient, the landslide thrusts and soil resistance of two types are close. The maximum difference of measured intensity is less than 20 percent, indicating minor anchor cable effect. When seismic coefficient is larger than 0.2, anchor cables improves the compatibility of deformation. In this situation, the interactive force between pile and soil increases, and resistance of soil decreases greatly, and the slope is more stable. Meanwhile, the cable tension makes internal force larger in cantilever segment. Thus cantilever segment should be strengthened in structural design, and embedded segment can be weaken appropriately. The achievement of analysis provides reference for seismic design, rebuilding after earthquake, and revision of related specifications in high seismic intensity zones.

Key words: sheet pile wall, anchored sheet pile wall, shaking table test, dynamic characteristics, comparative analysis