基于虚拟钻孔的工程地质三维剖切的实现

3D Sectioning Realization of Engineering Geology Based on Virtual Borehole

给出工程地质数据库的结构,并利用标准地层层序表和钻孔数据,根据层面TIN模型,建立了工程地质三维模型;在此基础上提出一种实用的工程地质三维剖切的实施方法,该方法通过剖切平面与层面TIN边的交点生成虚拟钻孔,把虚拟钻孔所在的地质剖面作为约束条件,将虚拟钻孔和实测钻孔一起重新构建层面TIN模型,并实现工程地质三维剖切。该方法简易可行,对层状地质结构的三维剖切效果较好,能满足工程地质分析和地质解释等应用的实际需要。

3D geological cutting can completely and unambiguously define the geological structures for the site being modeled, including complex boundaries and embedded seams, which can help geologists and engineers to understand their research objects better and greatly enhance the accuracy of geologic analysis. On the basis of the research of before, the structure of engineering geological database is put forward with application of standard stratum sequence table and drilling hole datum, and based on layer surface TIN（Triangular Irregular Network） model, the 3D model of engineering geology is built up, then on this basis, a practical method to implement the 3D engineering geology plane is offered. By applying the intersects of cutting plane and edges of layer surface TIN to generate virtual drilling holes, and geological section is created by these virtual drilling holes, then taking the geological section as restriction condition, rebuilt layer surface TIN model by combining virtual drilling hole and site borehole,and make the 3D cutting of engineering geology come true. For this method, the virtual drilling hole and cutting plane are considered fully, and the method is simple, feasible, low time consuming. The project cases have demonstrated that the technology can meet the practical requirement of en4dneering geological analysis and geological explanation, especially to layer geological structure.