微型桩-加筋土挡墙路基结构的公路护栏抗冲击性能

发布时间：2018-06-28 11:53

本文选题：加筋土挡墙 + 微型桩　；参考：《中南大学学报(自然科学版)》2017年08期

【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。
[Abstract]:In order to verify and evaluate the impact resistance of the subgrade structure of micro-pile-reinforced earth retaining wall, the impact dynamic response of the guardrail before and after reinforcement was compared and analyzed by numerical means. The results show that the reinforcement system of micro-pile-reinforced earth retaining wall from top to bottom is equivalent to greatly increasing the anchoring depth of the guardrail through the "guardraile-connecting member, foundation beam, micro-pile, reinforced soil-foundation" system. The impact load acting on the guardrail is transferred from top to bottom to the reinforced soil and inside the foundation, while the foundation beam that is built along the length of the highway distributes the load from the point of use to the two sides, using the whole structure to share the load. Therefore, the impact resistance of the guardrail can be significantly enhanced, the impact displacement of the guardrail can be reduced by about 90%, and the maximum lateral displacement of the slab under different impact loads can be reduced by 82.1% and 94.3% as compared with that before reinforcement. The reliability of the impact resistance of the guardrail is preliminarily verified.
【作者单位】：河海大学土木与交通学院;国土资源部丘陵山地地质灾害防治重点实验室;重庆大学山地城镇建设与新技术教育部重点实验室;
【基金】：国家自然科学基金资助项目(51609040,51379067,51679072);国家自然科学基金重点国际(地区)合作研究项目(51420105013) 福建省自然科学基金资助项目(2016J05112)~~
【分类号】：U417.12

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