岩体隧道三维建模及围岩非连续变形动态分析

结合东北地区某隧道工程,根据获取到的隧道工程岩体结构现场原始数据,应用自主开发的GeoSMA-3D系统,基于简单块体模型间相互组合构建复杂岩体模型的原理,采用不连续面网络图模拟真实岩体的几何特征,对隧道围岩的岩体结构面进行三维空间模拟,建立了该岩体隧道工程三维数值模型,并采用一种基于网格划分的块体识别方法,获得结构面划分岩体得到的所有块体。将所建立的三维数值模型选取其中某一典型断面的数据信息,导入二维非连续分析程序DDA针对二维平面内的应力及位移进行计算分析,对隧道围岩的破坏过程进行动态分析,得到的动态位移图和模拟结果对隧道工程超前预报、开挖支护具有一定的借鉴意义。

Three-dimensional Modeling of Rock Tunnel and Its Dynamic Analysis of Discontinuous Deformation Using DDA Code

Based on a tunnel project in Northeast China,according to the original data of the tunnel’s rock structure acquired on the construction site,this article applied own developed GeoSMA-3D system,based on the theory of combining simple block models to build a complex one,and using discontinuous network diagrams to simulate virtual reality of rock mass geometry,a three-dimensional structure of structural plane of the rock surrounding was simulated,and a three-dimensional model of rock mass was established.Then,all blocks from structural plane division were obtained according to a method based on grid division.After that,a typical section from the model was selected and its data were imported into DDA code to analyze its stress and displacement in two-dimensional plane,and to make dynamic analysis of discontinuous deformation of tunnel surrounding rock,and the dynamic displacement map acquired has certain significance for advanced prediction and excavation and support of the tunnel.