Abstract: 3D geological modeling and numerical simulation are important analytical tools for underground space exploitation. However, the geological modeling data are hard to apply in numerical simulation in current. One of the main reasons for the low reliability of numerical simulation results is that the distribution of strata cant be accurately characterized. Based on the multi-source data coupling modeling theory,combined with borehole data, stratigraphic contact constraints and attitude information,a geological model of complex regions was established via the Cokriging gradient interpolation method from the potential interpolation.The geological model could be imported to the iS3 platform and incorporated into the unified information management system of the project.And by the secondary development, the data of the geological model was combined with the numerical simulation,and the spatial distribution of the strata was fully considered under the requirements of the grid quality and complex construction conditions simulation.Taking Nanjing Metro line 5 as the application object,the results show that the multi-source data coupling modeling can better reveal the spatial distribution of the composite stratum in the shield crossing section.Based on the iS3 platform, the geological modeling results can be further utilized, and the uneven distribution of the stratum can be fully considered in the numerical simulation to realize the numerical digital integration.

Key words: geological engineering, geological modeling, numerical simulation, numerical and digital integration, iS3 platform

摘要： 三维地质建模与数值模拟是地下空间开发重要的分析工具，然而目前地质建模的数据难以简便地应用于数值模拟中，不能准确表征地层的分布是造成数值模拟计算结果可靠性较低的主要原因之一。基于多源数据耦合建模理论，结合钻孔数据、地层接触约束及地层产状信息，通过借助潜势场方法的协克里金梯度插值法可建立复杂区域的地质模型。将地质模型接入iS3平台，纳入工程统一的信息化管理系统。并通过二次开发，将地质模型的数据与数值模拟相结合，在满足网格质量和模拟复杂的施工工况的要求下，充分考虑地层的空间分布。以南京地铁5号线为应用对象，结果表明：多源数据耦合建模可以较好地揭露盾构穿越段复合地层的空间分布形态，基于iS3平台，可进一步利用地质建模成果，在数值模拟中可以充分考虑地层的不均匀分布，实现数值数字一体化。

关键词: 地质工程, 地质建模, 数值模拟, 数值数字一体化, iS3平台