桩承地基土拱高度计算方法的研究及分析

综合考虑路堤填土高度、填土性质、桩帽大小及桩间距等因素,提出简便的土拱高度计算方法。具体分析了桩帽大小、桩间距,以及路堤填料高度和性质等因素对土拱高度及土拱高度与桩净间距之比的影响。结果表明:土拱高度受填土性质、桩帽、桩间距及填土高度等因素影响,其中受摩擦角、桩帽大小和桩间距影响较大,在设计时可首先考虑加大桩帽、减小桩间距或增加填料摩擦角的方式降低土拱高度来满足工程需求。在实际工程正常参数取值范围内,土拱高度大概集中在1.02～1.42倍的桩间净距范围内。

Study and Analysis of Calculation Method of Arching Height for Pile Foundation

This paper put forward a simple calculation method for soil arching height considering the embankment height,embankment properties,pile cap size,pile spacing and other factors,and concretely studied the influences of the pile cap size,pile spacing,filling height and filling properties on the soil arching height,the ratio of soil arching height to the pile net spacing.The results showed that the soil arching height is affected by the filling properties,pile cap size,pile spacing and filling height and the influence of the friction angle,pile cap size and pile spacing is larger,which means increasing the pile cap size and friction angle of filling,or reducing the pile spacing can be first considered to lower the soil arching height in order to meet the engineering design requirements.The soil aching height is about 1.02~1.42 times the pile net spacing which is in the normal range of actual project parameters.