台阶式是山区地形普遍采用的一种场地布置方式,它的一个特点是场地内存在变坡线,如直接用三棱柱法计算场地土方,会遇到三棱柱横跨变坡线而导致土方漏算、多算的问题。本文首先提出了棱柱三角形对的概念,在此概念基础上给出了计算场地零线、土方的方法,之后分析了台阶式场地变坡线的问题,提出了加约束边并对三角形网重构的解决方法。通过具体实例的验证,提出的方法可行并提高了土方计算的准确性。 Step is a mountainous terrain commonly used in a site layout, which is characterized by a change of slope line within the site, such as the direct calculation of the site with a triangular prism earthwork, will encounter the triangular prism across the slope line caused by earth leakage Count, more calculations of the problem. In this paper, the concept of prism triangles is first proposed. Based on this concept, a method of calculating the zero line and earthwork of the site is given. Afterwards, the problem of the slope change of the staircase is analyzed. Solution. Through the verification of specific examples, the proposed method is feasible and the accuracy of earthwork calculation is improved.