基于BIM技术的岩土工程信息模型数值计算功能实现方法

当前岩土工程信息模型更多地应用于可视化展示，一直没能深入到岩土工程的实际应用当中，很难直接进行岩土工程专业分析。究其主要原因，是缺乏将岩土BIM模型转换成计算模型的渠道。通过数据转换，研究岩土工程模型计算功能实现方法，建立BIM模型与计算模型间的映射关系，来解决这一难题。考虑岩土BIM模型和有限元模型的特点，根据等效刚度法，研究计算驱动的岩土工程BIM模型的概化方法。针对岩土BIM模型的数值计算功能需求，聚焦计算网格剖分环节，基于开源TetGen程序，对BIM模型进行四面体剖分，发展面向数值计算的BIM模型网格剖分技术。进一步，建立四面体网格模型与计算模型的信息一一映射关系，实现BIM软件与岩土工程通用数值分析软件之间的数据转换和信息交换，打通了复杂岩土BIM模型向计算模型转换的关键环节。最后，通过两个工程实例验证所提出的岩土BIM模型计算功能实现方法的可行性与有效性。

Realization Method of Numerical Calculation Function for Geotechnical Engineering Model based on BIM Technology

At present, the information model of geotechnical engineering is mainly used in visualization, but has not been deeply applied to the practical application of geotechnical engineering, so it is difficult to conduct professional analysis directly. The main reason is the lack of channels to convert geotechnical BIM model into numerical model. Through data conversion, the realization method of calculation function for geotechnical engineering model is studied, and the mapping relationship between BIM model and calculation model is established to solve the problem. Considering the characteristics of geotechnical BIM model and finite element model, the simplified method is studied according to the equivalent stiffness method. Aiming at the functional requirements of numerical calculation, the open source TetGen is used to carry out tetrahedral subdivision, and the numerical computational-oriented BIM model grid subdivision technology is developed. Further, the information mapping relationship between tetrahedral grid model and numerical model is established to realize data conversion and information exchange, and the key link of geotechnical BIM model conversion to computational model is opened. Finally, the feasibility and effectiveness of the calculation function realization method of BIM model in geotechnical engineering are verified by two engineering examples.