土工格栅加筋土路基是一项重要的技术革新, 对于提高公路质量、节约工程用地、保护生态环境意义重大。以某山区高速公路土工格栅高填方路基为对象, 采用简化Bishop法和楔形体法对其稳定性进行了分析, 并选择极限抗拉强度为90 kN/m的单向HDPE土工格栅作为加筋材料, 对36 m高边坡进行加筋设计。根据最终设计方案, 简化Bishop法得出最小安全系数K为1.32, 楔形体法得出最小安全系数K为1.45, 可以看出, 在复杂地形条件下, 可采用土工格栅加筋来改善高填方路基的稳定性, 使其稳定安全系数可以满足相关标准的要求;同时, 应结合实际工程特点, 通过合理调整筋材布置来提高填方路基的可靠性。
As an important technical innovation, geogrid reinforced embankment is of great significance to improving highway quality, saving land occupation, and protecting eco-environment. The stability of geogrid-reinforced high-filled subgrade of an expressway in mountainous area was analyzed using simplified Bishop method and wedge method. One-way HDPE geogrid with an ultimate tensile strength of 90kN/m was selected as reinforcement material for the high slope (36m) of the subgrade. The minimum safety factor K was 1.32 by simplified Bishop method, and was 1.45 by wedge method. Results indicate that geogrid reinforcement could improve the stability of high-filled subgrade in complicated terrain so that the safety factor meets the requirement of standards. Meanwhile, the rational adjustment of reinforcement layout according to the characteristics of specific project is recommended to enhance the reliability of high-filled subgrade.
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