| 摘要: |
| 脉动压力在岩石河床裂隙中的传播是导致大坝下游基岩冲刷破坏的主要原因之一。岩体裂隙网络作为水体的赋存空间，其结构特性决定了水流脉动压力波的传播规律。应用蒙特卡洛模拟方法，编译Fortran程序语言，模拟得出与天然岩体裂隙网络在统计上完全等效的、具有相似结构特性的仿真裂隙网络，实现管网线元和节点的自动编号存储。借助矩阵理论定义了衔接矩阵和回路矩阵，从数学意义上精确描述裂隙网络。提出了基岩冲刷破坏过程中，孤立岩块的自动搜索和逐层追踪的新方法。文中以10 m×10 m范围内的两组裂隙为例，依据裂隙网络的统计分布规律，通过蒙特卡洛模拟，给出由两组裂隙组成裂隙网络的模拟结构图以及块体逐层自动追踪的结果。研究结果为高坝下游基岩冲刷过程的模拟研究奠定基础。 |
| 关键词: 裂隙网络 蒙特卡洛模拟方法 块体搜索 逐层追踪 |
| DOI： |
| 分类号:TU45 |
| 基金项目:中央高校基本科研业务费专项资金（12CX04024A，13CX02049A） |
|
| A rock block auto-searching and rock layer auto-tracing method based on 2D fracture network simulation |
|
LI Ai-hua, ZHU Jiang
|
|
China University of Petroleum
|
| Abstract: |
| Rock bed scour downstream of high dams is mainly due to propagation of the fluctuating pressure within rock mass fractures. The fractures network is the storage of groundwater， and its structure determines the propagation law of the fluctuating pressure. In this paper， applying the Monte-Carlo simulation method， a simulated network of rock fractures is obtained by compiling a Fortran program. The simulated network is equivalent to the real rock fractures network in the aspect of statistics and has similar structure characteristics with the real network. Meanwhile， the cells′ and nodes′ numbers are automatically added to the network. Based on the matrix theory， the network is accurately represented by the joint matrix and the loop matrix. In order to reproduce the bed scour process， new methods of isolated block auto-searching and rock layer auto-tracing are proposed in the study. In this paper， as an example， two groups of the rock mass fractures in the area of 10 m×10 m are simulated by the Monte-Carlo simulation method. The figure of the fracture network is given and the results of rock layer auto-tracing at different scour stages are given by the Monte-Carlo method. These analysis results have laid a solid foundation for numerical simulation of riverbed scour process at the downstream of high dams. |
| Key words: fractures network Monte-Carlo simulation method rock block auto-searching rock layer auto-tracing |
