某高速公路顺层路堑边坡的勘察和优化设计

The investigation and optimum design for the bedding slope in an expressway

公路顺层边坡的的稳定与否,对于公路的施工安全和运行安全有着重要的影响。所以对此类边坡特点的分析研究非常重要。首先总结公路顺层路堑边坡的特点,提出了公路顺层路堑边坡的优化设计路线。在此基础上,以连云港某公路边坡为例,按照公路顺层边坡设计思路:在工程地质条件分析的基础上,采用赤平投影分析其破坏模式和极限平衡法计算其稳定性,以及对边坡的主要影响因素进行了敏感性分析,并依据计算结果确定了最优设计坡角。在保证总体边坡稳定的前提下,提出边坡的加固设计方案。结果表明该设计对工程建设有着很强的实用性和系统性。

It is known that the stability of the bedding slope of expressway directly affects the running safety of road, therefore, it is important to summarize its characteristics and determine its study methods. This paper presents a summary of its characteristics and an optimum design method. Then, taking an expressway of Lianyungang as an example, we discuss the application of this optimum design method. Namely, the breakage model is analyzed with coordination projection mapping method and the slope stablility is evaluated with the method of limit equilibrium based on the analysis of the engineering geology conditions. After that, the sensitivity analysis for the slope stability is done using the method of limit equilibrium. On the precondition of ensuring the whole stability of slope and the economic reasonability, the paper also advances the optimum angle of design, the anchor and spray concrete scheme of the slope improvement design. The example also shows that this optimum design method is systematic and practicable for the construction.