基于灰色关联度分析涵顶土压力影响因素敏感性

The Sensitivity Analysis of Influential Factors of Earth Pressure on High Embankment Culvert Based on the Grey Correlation Degree

涵顶土压力影响因素敏感性分析是涵洞病害防治研究的一个重要方面。基于灰色关联分析基本理论,考虑填土高度、沟谷宽度、涵洞所处沟谷边坡角度、地基土的模量、路堤填料的模量、黏聚力以及内摩擦角7个因素对高填方涵洞涵顶土压力系数敏感性程度进行分析。研究结果表明:(1)对高填方涵洞涵顶土压力影响程度大小的因素依次为:填土高度、填土内摩擦角、填土粘聚力、地基土模量、沟谷宽度、沟谷边坡角度、填土模量。也就是说涵顶土压力受填土高度和填土材料特性的影响最大,涵洞周边地形条件对其影响比较小。这一结论为进一步深化对高填方涵洞病害防治的认识提供了重要参考。(2)灰色关联度法能够把分析结果定量化,可以比较精确、比较直观地表示各因素影响涵顶土压力系数的程度,是一种简单而又实用的分析方法。

Sensitivity analysis for the earth pressures on high embankment culvert is one of important aspects in the research of disease control of culvert. Based on the theory of grey correlation analysis,seven factors,including filling height,the valley width,slope angle,soil modulus of foundation,modulus,cohesion and internal friction angle of embankment filling considered in studying the effect on the coefficient of earth pressure of high embankment culvert. The results show that:( 1) The factors influencing the earth pressure coefficient of high embankment culvert in turn are filling height,internal friction angle,cohesion of embankment filling,soil modulus of foundation,the valley width,slope angle,modulus of embankment filling,namely the most important influences of earth pressures on high embankment culvert are filling height and self-characteristics of filling materials. All these works were beneficial for deep understanding about disease control of culvert.( 2) Grey correlation degree method can accurately show that the parameters influence the degree of the coefficient of earth pressures on high embankment culvert,moreover,it can quantify the analysis results and it is convenience for the sensitivity analysis of earth pressure of culvert.