【作者】 程汉鼎；

【导师】 柴军瑞；

【作者基本信息】 西安理工大学 ， 水工结构工程， 2008， 硕士

【摘要】 由于如核废料的地质贮存、垃圾填埋场造成的污水下渗、海水入侵、输油管道老化而引起的渗漏等原因,裂隙岩体地下水可能受到严重污染的威胁。这些与人类生活密切相关的环境问题迫切需要我们对裂隙介质中地下水及污染物运移的机制进行研究。裂隙岩体中溶质运移的主要路径是通过具有水力联系的裂隙网络进行的,溶质在裂隙网络中主要是在渗流和浓度梯度作用下沿裂隙迁移,从而影响地下含水介质中的水环境。在充分了解和总结国内外裂隙岩体溶质运移研究发展历史及现状的基础上,对基于离散裂隙网络模型的裂隙岩体溶质运移进行了研究。具体的研究成果主要有以下几个方面:1、详细研究了裂隙岩体溶质运移的数学模型,比较全面地总结了裂隙岩体溶质运移数学模型的特点和适用范围,并进行了认真的分析比较。2、借鉴岩体离散裂隙网络渗流理论及其数学模型的建立方法,依据裂隙网络交叉点处的质量守恒原理和立方定律,建立了离散裂隙网络溶质运移数学模型,并推导出了该模型的数值求解方法。3、基于建立的离散裂隙网络溶质运移数学模型,在教研室开发完成的岩体离散裂隙网络渗流计算程序的基础上,借助FORTRAN语言自主编写了相应的计算机模拟程序。根据岩体裂隙的走向、迹长、间距和隙宽等的统计特征,应用Monte-Carlo方法随机生成裂隙网络系统,再代入初始条件和边界条件,进行了裂隙网络渗流及溶质运移数值计算,验证了程序的可行性。4、将前面研究的理论和数学模型应用到某高坝工程中,进行了坝区岩体离散裂隙网络中溶质运移的数值模拟。用自主开发的2-D Solute Transport程序进行二维稳定和非稳定渗流作用等工况下岩体离散裂隙网络溶质运移的工程应用研究,分析的结果对该高坝工程的坝库区地下水污染治理提供了理论依据。更多还原

【Abstract】 Underground water in the fracture has been imperiled by serious pollution, such as the leakage caused by nuclear waste disposal、landfill leachate、sea water intrusion and oil pipeline aging. The questions about environment, tying up to people’s life, need to make research urgently on the transport mechanism of water and solute in fractured medium. Actually, the fracture network is the main approach of solute transport in the fracture network by seepage flow and concentration grads, then effects the water environment in the aquiferous medium.Based on the understanding and summarization of the development process and actuality, the research of solute transport in fracture rock mass has been carried on by discrecte fracture network method. The main researches as follows:1、The mathematical models of solute transport have been researched detailedly, the traits and applicabilities have been summarized roundly, and been analyzed and matched seriously,too.2、The mathematical model has been established, which refering to the seepage thoery and mathematical model, in addition, based on the conservation of discharge and the test in single fracture, the numerical solution has been received.3、On the basis of the 2-D seepge program and the mathematical model, the numerical simulation programs have been built by FORTRAN. The statistic characters of strike、trace length、space and aperture, which can be used to create fracture network system by Monte-Carlo method. The feasibility and correctness could be validated by initial conditions and boundary conditions.4、The thoery and mathematical model are applied to model the solute transport in the dam area of a high dam. The 2-D solute transport programs are uesed for practical Engineering in the cases of steady flow and unsteady flow. The results can provide thoery fundament with pollution resource management.更多还原