基于TIN的三维地质挖填方计算分析研究

Research on 3D geological model for excavation and embankment based on TIN

传统挖填方计算根据经验估算开挖回填后体积的变化量,计算结果偏差较大,故而所确定的设计标高不准确,影响工程建设的工期和成本。本文利用钻孔数据、剖断面、地层信息等多源地质数据,建立了三维地质不规则三角形网格(TIN)模型,并在此基础上考虑了不同土体的可松性系数,改进了挖填方计算方法。工程实际算例表明,基于改进的挖填方计算结果与实际较为吻合。因此该算法简单高效,计算结果准确,具有良好的工程应用价值。

In the traditional calculation of excavation and filling,the volume change is estimated based on experience,and the result has a large deviation.Therefore,the design elevation determined is inaccurate,which affects the construction period and cost of the project.In this paper,the three-dimensional geological model of triangulated irregular network(TIN)is established by using multi-source data such as borehole data,section profiles,and strata information.Based on this,the loose coefficient of different soil is taken into account,and the calculation of volume of the excavation and fill is improved.The actual engineering example shows that the calculation results based on the improved method are in good agreement with the actual situation.Therefore,the algorithm is simple and efficient,and calculation result is not only accurate but also has good engineering application value.