土石方量是影响大型土木工程的工程进度和技术经济指标的重要参数。提出了一种基于BIM的精细化土石方量计算方法,以提高计算速度和精度。首先,将大型土木工程的地表面分成若干矩形子域,在每个子域上采用独立的薄板样条插值函数进行曲面拟合;然后,采用规则直角三角形网格对地形曲面进行离散,通过三角形网格的自动加密来提高和控制计算精度;最后,通过开挖面与地形面三角面片的拓扑及几何计算,得到准确的开挖边界位置,从而实现自动放坡并在BIM中生成三维开挖实体,得到精细化的土石方量计算结果。算例分析结果表明,所提出的方法可以自动准确计算大型土木工程的土石方量,提高设计效率和质量。

In large-scale civil engineering, the quantity of earthwork is an important parameter that affects the construction schedule and the technical and economic indexes of the project. In this paper, a precise calculation method for earthwork volume is presented based on BIM(Building Information Model) techniques to improve the calculation efficiency and accuracy. Firstly, the terrain surface is divided into several rectangular subdomains, each of which is simulated with an independent thin plate spline interpolation function. Furthermore, the terrain surface is discretized with regular right-angled triangular meshes, and the meshes are refined automatically to improve and control the simulation accuracy. In subsequence, through the topological and geometrical calculation of the terrain surface and the designed slope, the accurate excavation line is obtained and the BIM model is generated automatically. Finally, the 3D excavated body is generated by the Boolean operation between the original terrain body and the excavated slope, and the precise quantity of earthwork can be acquired. Engineering practice has proved that the quantity of earthwork in large-scale civil engineering can be obtained precisely with the present method, and the design efficiency and quality are also improved.