基于土石混合体蠕变变形的浅层滑坡成因机理研究

项目名称： 基于土石混合体蠕变变形的浅层滑坡成因机理研究

项目编号： No.41502288

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 地质学

项目作者： 熊炜

作者单位： 长安大学

项目金额： 20万元

中文摘要： 按照三种尺度相结合开展浅层滑坡成因机理的系统研究：宏观上总结浅层滑坡形成的地质背景、发育规律、影响因素等，建立滑坡的地质模型。细观上研究土石混合体的物理力学性质，并着重开展单向固结蠕变、剪切蠕变试验，研究含水量、颗粒级配、颗粒尺寸、土石混合体与母岩接触面积等单因素及多因素耦合影响下土石混合体的蠕变力学行为，建立多因素耦合的非线性粘弹塑性本构模型。微观上探寻土石混合体生成前后、滑坡发生前后物质体内的矿物成分及颗粒结构的变化，细化宏观地质模型，并运用微观能量法、蠕变损伤力学法、统计力学法，揭示浅层滑坡蠕滑变形破坏机理的本质。将得到的蠕变模型汇编入FLAC-3D软件进行滑坡计算，并与实际滑坡对比分析其应力-应变随时间的蠕变过程，定量化蠕滑破坏的各阶段特征量，为进一步开展浅层滑坡预测和防控研究提供理论依据。

中文关键词： 蠕变变形；多因素耦合；多种尺度；蠕变本构模型；浅层滑坡

英文摘要： The research will get in accordance with three scale to carry out the systematic research on the mechanism of shallow landslide. From the macroscopic angle, to summarize the geological background and development law and other factors of shallow landslide, and to establish a landslide geological model. From the mesoscopic angle, to study the physical and mechanical properties of soil-rock mixture, and to analyze the creep behavior with single or multiple factor coupling such as moisture content and particle size distribution and particle size and soil rock contact surface, and to constitute the nonlinear multi factor coupling model. From the microcosmic angle, to explore the change of mineral composition and particle structure before-after formation and before-after slope. Then to detail the macroscopic geologic model. Using micro-energy method and creep damage mechanics method and statistical mechanics method to reveal the nature mechanisms of the shallow landslide creep deformation and failure. Finally, the new model being assembled into FLAC-3D to comparative analysis the stress - strain creep over time with the actual landslide. Characteristics amount of various stages of creep damage are quantitated. Provide a theoretical basis for the further development of shallow landslide prediction and prevention research.

英文关键词： creep deformation;multivariate coupling;multiple scales;creep constitutive model;shallow landslide