应用地脉动的三维速度结构进行数值建模的研究

Research on Numerical Modeling Using Three-dimensional Velocity Structure of Micro Tremors

进行数值模拟的前提就是具备一个良好的数值模型,好的三维模型不仅仅要与真实的地理地质情况相匹配,而且还需要具有一定的平滑度。建模的关键在于确定目标区内各控制点所对应的各物理层或地质层的深度。另外,也需要确定各层对应的介质物理力学参数。提出以地脉动实测值为目标函数,通过调整模型与介质物理力学参数,拟合地脉动实测点解析波谱,从而确定数值模型的方法,为数值模拟建模提供了一条新思路。最后结合宝鸡市长寿沟黄土边坡的建模实例,应用地脉动的三维速度结构进行了建模尝试,拓展了地脉动的应用空间。

A good three-dimensional model, which is the precondi-tion of numerical simulation, should not only match with real geo-graphical and geological model, but also need certain smoothness. The key of modeling is to determine the depth of each physical or geological layer corresponding with each control point in the target area. In addition, it also needs to make sure the physical and me-chanical parameters of media of each layer. The paper uses the ana-lytical spectroscopy of micro tremors as the objective function, by adjusting the model and mechanical parameters of the media, and thus determines the numerical model. This offers a new way for nu-merical modeling. Finally, combining with the loess slope model-ing of Baoji Changshougou, the numerical modeling is attempted with the three-dimensional velocity structure of micro tremors, which expands the applicant space of micro tremors.