西部山地城镇黄土滑坡灾变机理的物理力学试验与颗粒流数值仿真研究

项目名称： 西部山地城镇黄土滑坡灾变机理的物理力学试验与颗粒流数值仿真研究

项目编号： No.41272326

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 天文学、地球科学

项目作者： 赵红亮

作者单位： 兰州大学

项目金额： 73万元

中文摘要： 本项目针对西部山地城镇黄土滑坡地质灾害频发的严峻形势，以黄土滑坡的变形破坏过程和致灾机理为研究对象，依托兰州市皋兰山滑坡群实例，进行典型黄土试样的三轴剪切试验和浸水变形试验，测定滑坡岩土体的基本物理力学参数；结合黄土的结构性特征，考虑岩土材料的宏观力学行为受到颗粒强度、颗粒尺寸、排列方式和密实度等细观参数的影响，引入新兴的颗粒物质力学理论，将黄土的细观结构与宏观力学行为相统一，建立结构性黄土的细观力学模型；通过数值试验建立结构性黄土的材料组构参数与离散元颗粒参数的内在关联，采用颗粒流程序开展黄土滑坡变形- - 破坏- - 运动全过程的数值仿真，揭示结构性黄土滑坡灾变的细观力学机理，为保障人民生命财产和区域可持续发展提供科学依据和理论支撑。

中文关键词： 黄土；滑坡；致灾机理；颗粒流；数值仿真

英文摘要： Aiming at geological hazard of Loess landslides for mountain town in western China,we will research on distortion and failure process of loess landslides, as well as cataclysm mechanism. As example for landslides of GaoLan Mountain in LanZhou City,we will carry out triaxial shearing test and waterishlogged deformation test, then determine elementary mechanical parameters of landslides material.Incorporation with structural feature of loess,we will dicuss microscopical parameters such as granulometric strength,granulometric size,queued pattern,as well as compaction degree, which affect macroscopical mechanical response of landslides material.Introducing rising granular flow theory,we will present rational constitutive relation for structural loess,which unify microscopical construction and macroscopical response. By means of substantive numerical test, we will found inherence relationship between granular parameters in discrete element code with actual gain of landslides loess. For deformation, movement and failure process of landslides, we will carry out numerical modelling via particle flow code, then will reveal microscopical mechanism, which can provide science refference and technology support to life and property, as well as regional sustainable development.

英文关键词： Loess；Landslide；Destructive Mechanism；Particle Flow；Numerical Simulation