山区公路边坡安全评价系统设计与实现

Design and realization of slope safety assessment system along highway in mountainous area

针对山区公路边坡量多面广、面临地质环境复杂、形成时间短和安全稳定性较差的特点,提出山区公路边坡整体和局部安全评价系统设计和实现的方法。在整体评价方面,基于简单关联函数对各评价指标进行相对重要程度排序,采用层次分析法和专家效度对评价指标权重进行修正,利用物元可拓分析方法建立物元可拓评价模型,在此基础上通过Visual Basic高级语言编程开发实现边坡整体安全评价子系统;在局部安全分区方面,对统一强度理论和Lode应力参数进行耦合,建立公路边坡局部安全评价数学模型,并对有限元分析软件ANSYS与ArcGIS进行耦合,构建公路边坡局部安全分区子系统。以重庆市两巫(巫山-巫溪)公路k88+680边坡为例进行安全评价。结果表明,该边坡整体属于欠安全等级,并得到该边坡局部安全分区图。

For slopes along highway in mountainous area,methods were worked out for their safety evaluation. In the aspect of their holistic safety-evaluation,firstly,sorting relative importance degree of each evaluation index based on simple correlation functions. Then,the analytic hierarchy process and expert validity were used to correct the weights of evaluation indexes. Finally,a model was built for matter-element extension evaluation based on matter-element extension analysis method. On this basis,a holistic safety evaluation subsystem of highway slope was implemented through the development of Visual Basic programming in a high-level language. In terms of local safety division,a mathematical model was built for evaluating local slope safety by coupling unified strength theory and stress Lode parameters. Then,a local safety subsystem of highway slope was developed by coupling finite element analysis software ANSYS and ArcGIS. The k88 ＋ 680 slope along Wushan-Wuxi road in Chongqing city was evaluated based on system. The result indicates that slope is inadequacy safe. It conforms to reality.