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在桩承式路堤土拱效应的分析中,桩土应力比是评价土拱效应的重要参数。土拱效应对分析桩承式路堤荷载传递和沉降变形有重要的影响。目前比较常用的几种土拱效应计算方法的假设条件和适用范围都存在一定的差异。Terzaghi和Low的计算方法仅适用于平面土拱中,Hewlett和Randolph和德国EBGEO 2004方法仅适用空间土拱,而英国规范(BS8006)的计算方法同时适用于平面土拱和空间土拱。讨论了常用土拱效应计算方法的基本假设差异,并结合几个工程实例分析了各种计算方法的适用性。
In the analysis of the soil arching effect of piled embankment, the pile-soil stress ratio is an important parameter to evaluate the soil arching effect. Soil arching has an important influence on the analysis of load transfer and settlement of piled embankment. At present, there are some discrepancies between the assumptions and applicable scopes of several commonly used calculation methods for soil arching effect. Terzaghi and Low’s calculations apply only to plane soil arching, while Hewlett and Randolph and the German EBGEO 2004 method apply only to space soil arching, whereas the British Standard (BS8006) method applies both planar and spatial soil arching. The differences of the basic assumptions of the commonly used calculation methods for soil arching are discussed. The applicability of various calculation methods is analyzed with several engineering examples.