在山高坡陡、地形地质条件复杂的山区修建土工合成材料加筋土路堤是一个很大的挑战。结合某公路建设中利用隧道开挖弃土修筑的50 m高土工格栅加筋土路堤, 探讨了在山区复杂地形条件下加筋土高陡路堤面临的工程地质水文地质问题, 采用极限平衡法对加筋土路堤典型断面进行了计算分析, 对可能采取的对应工程措施进行了讨论。基于计算结果, 阐述了增设坡底支撑墩、岩层锚杆, 调整加筋层间距和长度等增强山区加筋土路堤的稳定性和控制变形能力的工程措施。施工及监测结果表明, 该土工格栅加筋土路堤工作稳定, 所采取的工程措施达到了预期的目的。
Abstract
It’s a great challenge to construct geogrid-reinforced soil embankments in steep high mountainous area with complicated topographic and geological conditions. The geogrid-reinforced embankment of 50m height built using discarded soil generated by tunnel excavation was analyzed to explore the engineering geological and hydrogeological problems encountered in the design and construction. By using limit equilibrium method, the stability of typical cross-sections of reinforced embankment was calculated, and different engineering measures corresponding to this project were compared and discussed. On the basis of the calculation results, engineering measures including crushed stone concrete piers, anchor bolts, and adjustment of the length and vertical space of reinforcing material were selected to increase the embankment’s stability and to control the differential settlement. The performance of embankment and the monitoring results indicated that the geogrid-reinforced embankment stand stable, and the adopted engineering measures work well as anticipated.
关键词
路堤 /
土工格栅加筋土 /
稳定性 /
山区 /
复杂地形
Key words
embankment /
geogrid reinforced soil /
stability /
mountainous area /
complicated terrain
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基金
湖北省交通科学研究计划项目“无面板土工格栅加筋土挡墙关键问题研究”(2011-700-3-42)
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