预应力锚索桩板墙动力响应现场试验与数值分析

Dynamic response field test and numerical analysis of pre-stressed sheet-pile wall

基于邵怀高速公路某标段预应力锚索桩板墙及路基的动力响应现场试验,通过改变车辆荷载和行车速度,对路基和预应力锚索桩板墙下多个测点进行测试。根据现场试验结果,并借助有限元数值模拟,分析了路基和预应力锚索桩板墙动应变随行车荷载和行车速度的变化关系。研究结果表明:路基和预应力锚索桩板墙中动应变与车辆荷载关系密切,而与行车速度关系不明显,动应变随深度增加而表现出明显衰减的规律,交通荷载对路基与挡土墙的变形受力影响深度均为2.5 m左右。因此,在实际挡墙设计时,应该慎重考虑车辆荷载这一因素对预应锚索桩板墙稳定性的影响。

Based on dynamic field test of pre - stressed sheet - pile wall and the embankment in a section of Shao--huai expressway, multiple measuring points under the embankment and pre - stressed sheet - pile wall was measured. According to the results of field test, the changing relationship of the dynamic strain of embank- ment and pre -stressed sheet -pile wall due to the variation of traffic load and the speed of vehicles was investi- gated. With the help of （finite element） numerical simulation. The results show that the dynamic strain in the subgrade and pre- stressed sheet -pile wall has a close relationship with the vehicle loads, while it is uncon- spicious with the speed of vehicle. Moreover, the dynamic strain presents an obvious attenuate law with the in- creese of depth, and the influence depth of vehicle loads on embankment and retaining wall is approximately 2. 5 m. Hence, in the design of retaining wall, more attention should be paid to the traffic loads＇ influence on the stability of sheet -pile wall.