阿联酋沙漠重载铁路路基边坡降水侵蚀评价方法及修复方案研究

Study on Evaluation Method of Rainfall Erosion and Maintenance Scheme for Embankment Slope of Heavy Haul Railway in UAE Desert Area

阿联酋大部分地区处于沙漠地带,且存在雨季集中、风沙气候明显的问题。沙漠地区铁路项目因地制宜,较多地采用级配砂作为路堤回填材料并采用当地易于获取的Gatch料作为包边土护坡的路堤设计方案。然而这种包边土防护方式易受降水冲刷影响,本文针对这种设计方案提出了一种基于土壤流失方程的路堤易侵蚀性评价方法,进而在此评价方法基础上设计了完整的监测-修复方案,并在铁路工程实践中论证该方法的可行性。通过研究和实践证明:该评价方法能够全面、可靠地评价边坡易侵蚀性;基于评价方法提出的监测-修复方案具有适用范围广、评价准确性高、监测-修复成本低的优点。

Considering that most of the UAE is located in the desert region,and there are problems such as concentrated rainy season and obvious wind-sand climate,railway projects in the desert region are adapted to local conditions.In the design which often adopted by the railway projects,graded sand is often used as backfill material for embankment,and local easily accessible Gatch material is used for slope protection.However,this method of slope protection is vulnerable to rainfall erosion,this paper proposes an evaluation method based on universal soil loss equation for the design scheme showed above,and a complete monitoring-restoration scheme has been planned based on this evaluation method,the feasibility of this method has been demonstrated in the practice of railway engineering.The research and practice show that:the evaluation method can comprehensively and reliably evaluate the erosion vulnerability of slope;the monitoring-repair scheme proposed based on the evaluation method has the advantages of wide application scope,high evaluation accuracy and low cost.