低等级道路技术指标选取的分析与研究

Analysis and Research on the Selection of Technical Indicators of Low-grade Roads

针对现行《公路路线设计规范》和《林区公路设计规范》对于面山绿化、生态修复、农业水利类项目低等级道路工程中的施工便道、防火通道及建管道路的不适性的问题,本文以拉萨南北山绿化配套工程中的道路工程为例,通过相关技术指标选取的对比论证分析,并结合每延米土方开挖面积与边坡坡率、地面横坡的几何关系和数值计算结果,提出解决方案;并得出在横坡角度大于45°,开挖边坡坡率大于0.85时,存在开挖土方量大、经济合理性低的问题,已不适合修建建管道路和施工便道。

In view of the discomfort problem of the current relevant Design Specification for Highway Alignment and Design Specification for Forest Highway in many low grade road engineering field,like the construction access roads,fire prevention roads and construction management roads for the project of the mountain greening ecological restoration,agricultural and water conservancy engineering. This paper takes the road project in the greening supporting project of the north and south Mountains of Lhasa as a case,through the comparison and demonstration of relevant technical indicators,and combined with the geometric relationship and numerical calculation results between the per linear-meter earth excavation area and slope rate and ground cross slope,the solution is proposed. It is concluded that when the cross slope angle is greater than 45°,the excavation slope rate is greater than 0.85,there is a problem of large excavation volume and low economic rationality. Therefore,it is no longer suitable for building pipe roads and construction facilities in this case.