中文摘要：

为了对微型桩-加筋土挡墙路基结构的护栏抗冲击性能进行验证和评价,利用数值手段开展加固前后的护栏冲击动力响应对比分析。研究结果表明：微型桩-加筋土挡墙通过＂护栏—连接构件—地基梁—微型桩—加筋土—地基＂这一从上到下的加固体系,从受力机制上相当于大大增加护栏的锚固深度,将作用在护栏上的碰撞荷载自上而下地传递到加筋土及地基内部,而沿公路长度方向浇筑的地基梁则将荷载从作用点向两侧分散传递,利用整体结构来分担荷载,因而显著增强护栏的抗冲击能力,可减小约90%的护栏碰撞位移,并使得不同碰撞荷载作用下的面板最大侧向位移比加固前减小82.1%~94.3%,初步验证其护栏抗冲击性能的可靠性。

英文摘要：

In order to validate and evaluate the impact resistance of road barrier of micropile-MSE wall, comparative studies were done on the impact response of the barrier before and after reinforcement with micropiles through numerical method. The results show that through the top-down reinforcement system of ＂barrier—connecting pieces—grade beam—micropiles—MSE—foundation＂, the impact loading acted on the barrier is transferred to the MSE and foundation region from top to bottom of the MSE wall, and the grade beam along the length of road transfers the impact loading from center to two sides. Hence, the impact loading is actually supported by the whole retaining structure, which increases the impact resistance of road barrier significantly. As a result, the impact-induced displacement of barrierreduces by about 90% after reinforcement, and the maximum wall facing displacement decreases by 82.1% to 94.3% under different impact loadings, which preliminarily validates the reliability of impact resistance of road barrier of micropile-MSE wall.