【作者】 邓建丽；

【导师】 刘高；

【作者基本信息】 兰州大学 ， 岩土工程， 2008， 硕士

【摘要】 滑坡是自然界中常见的灾害,分布广泛、发生频繁、危害性大。一旦失稳滑动,将严重威胁人民群众的生命财产和各种工程安全,造成重大损失。若能事先对滑坡的滑动特征及成灾范围有所估计和预测,对重大工程的布局以及减轻灾害均有重要意义。滑坡失稳运动不是一个独立、纯粹的过程,而是与滑动前的整个滑坡系统紧密关联的。对滑坡运动过程仿真,必须基于滑坡系统科学。只有在详细研究滑坡形成条件、影响因素、形成机理和演化过程、稳定性分析和演化趋势的基础上,才能做出合理仿真和预测其灾害范围。本文在上述研究成果的基础上,基于滑坡运动学理论,建立滑坡运动模型及给出相应的控制方程,运用有限体积法,并参考CFD技术,采用VisualFortran编制专用计算程序,实现滑坡运动过程三维动态仿真。(1)介绍了两种主要滑坡运动模型—块体模型和Sassa模型,归纳现有常用的滑坡运动滑速、滑距计算方法。(2)简要阐述FVM的基本原理、网格结构、常用的离散格式、FVM的特点及其应用。(3)对滑坡体进行合理假设,给出滑坡运动控制方程,采用FVM进行离散,用VisualFortran编制计算程序,介绍了程序的基本功能和使用方法。(4)用兰州石峡口滑坡的实际滑动情况与计算仿真结果比较,得出仿真情况与实际基本符合,说明程序可行性。(5)预测积石峡水电站坝后Ⅰ号滑坡失稳运动情况和滑坡规模、淹没范围、滑坡坝、回水壅高等灾害情况。更多还原

【Abstract】 Lanslides are common nature disasters with the characters of widely distributed, frequencely occurrences, large damages. They will seriously threaten peoples’ lives and properties, will cause serious loses once sliding. For the engineering distribution and disasters’ mitigation, it has very important significance to understand the characters of landslides’ movements, to estimate the extensions in advance.Landslides’ movements are not absolute progresses, but tightly associated with landslides systems before sliding. So simulating the landslides’ movements must be based on their system sciences. Reasonable simulation landslides’ movements and predicting the disaster areas should base on the particular research of landslides’ forming conditions, evolution mechanisms, stability analyse and the evolution trends of landslides. The dynamic movement model and control equations are put forward based on landslide kinematics theory. Finally the special calculation program is compiled to imitate landslides, movements adopting finite volume method and CFD technology. (1) Two existing landslide movement models including Block Model and Sassa Model are introduced and available common calculation methods are summarized. (2) The basic principles and grid structure of finite volume method (FVM) were briefly described and FVM’s common-used discretization scheme and characteristics and application were introduced.(3) Based on reasonable hypothesis of landslide body, the control equations of landslide movement are given and landslide body is discretized by using FVM. A computation program has been made by Visual FORTRAN and its basic functions and using methods were introduced. (4) The sliding characteristics of Lanzhou Shixiakou landslide is emulated by using compiled special computer programs. Simulation results are compared with the actual sliding situation and found that the simulation results testify the rationality and practicability of the compiled special computer programs.(5)Study on No.1 downstream-Side landslide of Jishixia hydropower station, its movement conditions of landslide failure, landslide scale, inundated area, landslide dam, and run up height of backwater are predicted.更多还原