3D GIS支持下盐腔围岩三维计算模型的生成

Generation method of three-dimensional computing model of wall rock of salt caverns supported by 3D GIS

目前盐腔围岩蠕变模拟中计算网格生成多是理想化的,并没有充分利用真实探测数据。针对这些问题,提出了一种新的三维计算模型生成方法。借助HalfEdge数据结构,基于研究区域边界、DEM(digital element model,数字高程模型)和钻井数据,构建了研究区域地层三维模型;基于声纳测腔数据构建了盐腔三维模型,并对其进行了拓扑检查与修正;将地层三维模型与盐腔三维模型进行三维空间布尔运算,获取盐腔围岩三维模型;通过对该模型进行三维空间网格离散,得到盐腔围岩四面体网格单元,即数值模拟计算模型。通过该方法构建的三维计算模型,可以为后期盐腔围岩蠕变数值模拟过程提供有效的计算网格,进而可以为盐腔的建造,尤其是安全合理地利用盐腔提供科学依据和技术支持。

The paper proposes a new three dimensional computational model in creep simulation of wall rock of salt caverns according to the current drawbacks that the computational grid is too idealized and unaware to adopt advantage of the real detection data.The three dimensional strata model is constructed by a well organized HalfEdge data structure,which integrates the study area boundaries,DEM（digital element model） and drilling data.Based on the sonar detection data of salt caverns,the three dimensional surface model of the salt caverns is constructed;and the topological inspection and correction operations to the model are carried out.To obtain three dimensional surface model of wall rock of salt caverns,Boolean operations between the three dimensional strata model and the three dimensional surface model of salt caverns are executed.The computational model of numerical simulation is generated by executing the mesh generation operation to the three dimensional surface model of wall rock of salt caverns.The three dimensional computational model obtained by this method advantages in providing effective computational mesh for post creep numerical simulation process of wall rock of salt caverns;and it is a scientific basis and technological support for the construction and reasonable utilization of the salt caverns particularly.