平均断面法在计算道路弯曲处土方的缺陷及改进

摘要

在道路弯曲处的土方计算由于相邻断面之间不平行,断面间几何中心水平投影距离不一样,若直接采用平均断面法计算土方,会影响土方量计算的准确性.针对这种情况,本文建议采用平均断面法的改进型来计算道路弯曲处的土方,平均断面法改进型相邻断面间距以几何中心投影间距代替相邻垂直断面之间的道路中心距离.通过对工程实例中的三种土方计算方法比较,可知平均断面法改进型在道路弯曲处计算土方具有更高的精度.%Since the adjacent sections are unparallel each other and their geometric-centre horizontal projection distances are different, the application of average section method will affect the calculation accuracy of earthwork at road bend. In the case, an improved average section method is proposed to calculate the earthwork at road bend. The road center distance between two adjacent vertical sections is replaced by the geometric center projection distance. The comparison of three earthwork calculation methods shows higher precision of the improved average section method in the calculation of earthwork at road bend.