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为了增强公路加筋土挡墙系统的外部稳定性、护栏抗冲击性能,并控制加筋土的变形,提出了微型桩-加筋土挡墙系统:竖直和倾斜的一对微型桩从路面穿过加筋回填土区域,锚固进地基,同时在桩顶浇筑承台和地基梁,通过连接构件将公路护栏与地基梁及微型桩相连,形成一个自上而下的整体加固体系。利用数值手段对不同加筋土挡墙结构的应力变形特性和加固机理进行对比分析,结果表明:与“未加固”、“单根竖直桩加固”、“竖直桩+倾斜锚杆”以及“竖直桩+水平锚杆”这四种挡土墙工况相比,所提出的微型桩-加筋土挡墙的位移分别可以减小46.9%、34.6%、33.3%和22.7%,竖直桩身弯矩与后三者相比分别可以减小72.7%、72%和47.7%。因此,验证了微型桩-加筋土挡墙具有较好的应力变形特性。
In order to enhance the external stability of the highway reinforced earth retaining wall system and the impact resistance of the guardrail and control the deformation of the reinforced soil, a micro-pile-reinforced earth retaining wall system is proposed: a pair of vertical and inclined micro-piles from the road surface Through the reinforced backfill area, anchored into the foundation, at the same time in the pile top pouring platform and foundation beam, through the connecting member of the highway guardrail and foundation beams and micro-pile connected to form a top-down overall reinforcement system. The numerical analysis of the stress-deformation characteristics and the reinforcement mechanism of different reinforced earth retaining wall structures shows that: compared with the “un-reinforced” and “single vertical piles reinforced” and “vertical piles + The displacement of the proposed miniature pile-reinforced earth retaining wall can be reduced by 46.9% and 34.6% respectively compared with the four kinds of retaining wall conditions including ”inclined anchor“ and ”vertical pile + horizontal anchor" , 33.3% and 22.7% respectively. The vertical pile bending moment can be reduced by 72.7%, 72% and 47.7% respectively compared with the latter three. Therefore, it is verified that the micro-pile-reinforced retaining wall has better stress-strain characteristics.