基于三维弹塑性本构的土质滑坡高精度动力学模型研究

The establishment of the landslide dynamic models and then the prediction of affected area have been a difficult problem of landslide risk assessment. Most studies in this area, however, ignored comprehensive analysis of the dynamic mechanism during the landslide simulation so that the dynamic models and related parameters could not be reasonably selected. Also, the low efficiency of the landslide information model building was ignored. The previous studies of applicants based on the three-dimensional fluid constitutive model and elastic-perfectly-plastic constitutive model, respectively predicted the affected area of the flow-type landslide and soil landslide. This proposal is intended to take the soil landslide as the study object, developing three-dimensional elastic-plastic soil constitutive model on smooth particle hydrodynamics (SPH) framework as the core. The landslide modeling in this study will be based on spatial data in geographic information system (GIS), with comprehensive analysis of the landslide dynamic mechanism and consideration to characteristics of the soil plastic deformation. This project will focus on the establishment of the three-dimensional high-accuracy dynamic model, parameter selection system, GIS generic data modeling and numerical programming. In additional, this study will propose a set of simulation analysis methods based on GIS spatial data and the scope of predicting methods for soil landslide through typical soil landslides case for theory verification and application. With the improvement of the accuracy and applicability for soil landslide hazard analysis and prediction, it has high theoretical significance and value.

通过建立滑坡动力学模型进而预测滑坡影响范围，一直是滑坡风险研究领域的难点问题。然而，部分滑坡模拟研究中忽略了对滑坡动力机理的深入分析，不能合理选取运动模型及相关参数，且忽略了前期滑坡地质信息建模的效率问题。申请者前期研究以三维流体本构与二维理想弹塑性固体本构为基础，分别实现了对流动型滑坡与土质滑坡的影响范围预测。本课题拟以土质滑坡为研究对象，以光滑粒子动力学（SPH）方法框架下的土体三维弹塑性本构模型为核心，以地理信息系统（GIS）空间数据为基础，深入分析滑坡动力机理，充分考虑土体的塑性变形特征，研究土质滑坡三维高精度动力学模型建立技术、参数指标体系、GIS通用数据建模方法、数值编程等关键问题。课题以典型滑坡案例为背景进行理论验证和应用，并面向土质滑坡提出一套基于GIS空间数据的模拟分析方法与影响范围预测方法。课题提高了土质滑坡灾害范围预测分析的精度和适用性，具有较高的理论意义和应用价值。

通过建立滑坡动力学模型进而预测滑坡影响范围，一直是滑坡风险研究领域的难点问题。 本课题以二维理想弹塑性固体本构、三维流体本构为基础，分别实现了对流动型滑坡与土质滑坡的影响范围预测。并以土质滑坡为研究对象，以光滑粒子动力学（SPH）方法框架下的土体三维弹塑性本构模型为核心，以地理信息系统（GIS）空间数据为基础，充分考虑了土体的塑性变形特征，建立了土质滑坡三维高精度动力学模型与GIS通用数据建模方法。课题以典型滑坡案例为背景进行理论验证和应用，并面向土质滑坡提出一套基于GIS空间数据的模拟分析方法与影响范围预测方法。课题提高了土质滑坡灾害范围预测分析的精度和适用性，具有较高的理论意义和应用价值。