【作者】 陈亮；

【导师】 刘汉龙； 刘军；

【作者基本信息】 河海大学 ， 岩土工程， 2007， 硕士

【摘要】 由于岩体中的结构面主导着岩石边坡的破坏机理，因此基于连续性理论的分析方法在分析岩石边坡的变形特征具有相当的局限性。而基于非连续介质力学的离散单元法因为不仅能够很好地表征岩土体材料的非均匀性和各向异性，而且能很好地模拟碎块的形成及运动。本文重点是以颗粒元为基础，建立离散元框架内的网格实体模型，并自行开发数值计算软件，结合典型工程背景进行岩石高边坡变形的研究和探索。 本文主要进行了如下工作： (1)以颗粒元的离散单元法为基础，提出离散元框架内的网格实体模型。网格实体模型是指用颗粒单元将研究对象离散化，用接触发现算法确定每个颗粒单元的邻居单元，并在所有相邻单元间施加“梁”，这样在整个介质中就形成了一个“梁”的网络。通过所建立的强度准则，判别“梁”是否存在，利用矩阵位移法求解“梁”的受力，用离散单元法描述颗粒运动。 (2)采用C语言开发了基于离散元框架的网格实体模型程序DEM_LSM2D。计算软件的前、后处理模块由C调用OpenGL函数库实现。软件主界面和功能扩展模块(图片浏览器和批处理运算控制器)由VB6.0开发完成。 (3)应用DEM_LSM2D模拟三峡永久船闸高边坡的变形。在卸荷开挖条件下计算船闸高边坡的水平向和竖向的变形量。监测数据与模拟位移结果的对比表明该方法对卸荷条件下岩体的变形规律模拟是非常有效的。更多还原

【Abstract】 Where a rock slope comprises multiple joint sets, which control the mechanism of failure, continuum modeling is not so best suited for the displacement analysis of slopes. A discontinuum modeling approach may be considered more appropriate, because it not only can token the nonuniformity and heterogeneity of the geo-materials, but also be good at modeling the generation and movement of the fragments. Based on particle element model, a lattice solid model used in distinct element method is established and applied to rock slope stability analysis in three gorges project in this paper.The main research focuses are as followed:(1) Based on particle element model, a lattice solid model (LSM) used in distinct element method is proposed. In the Lattice solid model, the elements are distinct and detected by collision detection method. The neighbor elements are connected by the beams, which help to establish a net of beams. Through the strength criterion, the existence of the beam is detected. Matrix Displacement Method is used to solve the force applied to the beams, and the movements of the particles are described by the distinct element method.(2)A C program called DEM_LSM2D is developed, in which the Lattice Solid Model is adopted. The pre-process and post-process of the DEM_LSM2D is programmed by C and OpenGL function library. The interface and the of function extension module is finished by VB6.(3)The deformation of high slope in the Three Gorges project is simulated by the DEM_LSM2D. Taking excavation into consideration, the displacements on the horizontal and vertical are calculated. Comparing the field data and the modeling result, it shows that the Lattice solid model method is a proper way to model the rock deformation under unloading conditions.更多还原