研究目的：铁路BIM设计基于三维建模与可视化技术对路基、桥梁、隧道和站房等铁路构（建）筑物进行 虚拟建造。三维地学模拟技术是一种支持地质专家与计算机软、硬件进行三维的交互操作，科学推断一片三 维空间区域的地质条件，形成数字化的三维地质模型，并在计算机中可视化展现的信息技术。本文基于三维 地学模拟技术解决铁路工程地质条件的三维模拟问题，以三维的地质信息服务于铁路BIM设计工作。 研究结论：( 1)铁路工程地质条件的三维模拟具有特殊的专业性，不宜直接采用矿产、能源领域的传统三 维地学模拟技术；（2)本文提出的一种基于线性钻孔的三维地学模拟技术能够有效实现铁路桥梁地段工程地 质条件的三维模拟；（3)该研究成果可为铁路BIM设计工作提供三维地质信息。

Research purposes: Based on the three - dimensional modeling and visualization technology，railway BIM - based design implements virtual construction of the subgrades， bridges， tunnels， stations and buildings. Three - dimensional geological modeling is a kind of technology，which supports the interaction between geological experts and computer software and hardware， deducing the geological conditions of a piece of three - dimensional space， forming three - dimensional geological model， and visualizing the model in computer. In this paper， three - dimensional simulation of railway engineering geological conditions is achieved based on the three - dimensional geological modeling technology，which can provide three - dimensional geological information services for the railway BIM - based design. Research conclusions ：( 1) Three - dimensional simulation of railway engineering geological conditions is of specialty， so the traditional three - dimensional geological modeling technology in the mineral and energy fields is not suitable. The three - dimensional geological modeling technology with the linear borehole in this paper achieves the three - dimensional simulation of engineering geological conditionsin railway bridge section effectively. ( 3 ) The research results can provide the three - dimensional geological information for railway BIM - based design.