饱和—非饱和渗流理论在大坝低渗介质中的数值应用
发布时间：2018-08-07 10:31
【摘要】：渗流现象在工程各个领域广泛存在,实践证明许多事故都是由渗流引起的,因此对渗流场进行预测及分析具有广泛而深远的意义。本文主要从以下几个方面对问题进行分析和阐述：(1)以前此类问题的研究往往忽略了非饱和土体基质吸力对渗流的影响,导致计算结果与实际存在一定偏差。为了使模拟结果更加符合实际,本文将饱和区与非饱和区统一考虑,在达西定律的基础上建立饱和-非饱和渗流模型,以测压管水头及饱和度为变量对渗流场进行研究,渗流场的浸润线根据饱和度分布自动进行捕捉。(2)采用FORTRAN语言编写饱和-非饱和渗流计算程序,以ANSYS软件为基础,对研究对象进行实体建模,将单元节点信息导入SP程序的前处理模块并生成单元拓扑关系文件,调用主程序进行计算并通过TECPLOT软件输出计算结果。(3)参照前人的研究成果,选取两个典型的算例对SP程序的准确性进行验证。(4)以三个近期完工的大坝为例,分别对其低渗介质中的渗流采用SP程序进行数值模拟并对模拟结果进行分析,为渗流场预测以及工程防渗提供一定的参考。本文的研究成果是,将渗流场的饱和区与非饱和区统一考虑,建立了饱和-非饱和渗流模型,采用FORTRAN语音编制了相关的计算程序并对前处理以及后处理模块进行了一定优化,通过实例验证说明该程序是准确可靠的,应用该程序有针对性的对大坝低渗介质进行数值模拟。
[Abstract]:Seepage phenomenon exists widely in various fields of engineering, and it is proved that many accidents are caused by seepage flow, so it is of great significance to predict and analyze seepage field. In this paper, the problems are analyzed and expounded in the following aspects: (1) the influence of the suction of unsaturated soil matrix on seepage is often neglected in the previous studies, which leads to the deviation between the calculation results and the actual situation. In order to make the simulation results more in line with the reality, the saturated and unsaturated regions are considered in this paper. Based on Darcy's law, a saturated-unsaturated seepage model is established. The seepage field is studied with the water head and saturation of the pressure measuring tube as variables. The infiltration line of seepage field is automatically captured according to the saturation distribution. (2) the saturated-unsaturated seepage calculation program is compiled by FORTRAN language, and the entity modeling of the research object is carried out on the basis of ANSYS software. The unit node information is imported into the preprocessing module of SP program and the unit topology relation file is generated. The main program is called to calculate and output the calculation result through TECPLOT software. (3) referring to the previous research results, Two typical examples are selected to verify the accuracy of SP program. (4) taking three recently completed dams as examples, the seepage in low permeability medium is simulated by SP program and the simulation results are analyzed. It provides a certain reference for seepage field prediction and engineering seepage prevention. The research result of this paper is that the saturated-unsaturated seepage model is established by considering the saturation region and the unsaturated region of seepage field, and the relevant calculation program is compiled by using FORTRAN speech, and the preprocessing and post-processing modules are optimized to a certain extent. The program is proved to be accurate and reliable by an example. The application of the program can be used to simulate the low permeability medium of the dam.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TV64
本文编号：2169745
[Abstract]:Seepage phenomenon exists widely in various fields of engineering, and it is proved that many accidents are caused by seepage flow, so it is of great significance to predict and analyze seepage field. In this paper, the problems are analyzed and expounded in the following aspects: (1) the influence of the suction of unsaturated soil matrix on seepage is often neglected in the previous studies, which leads to the deviation between the calculation results and the actual situation. In order to make the simulation results more in line with the reality, the saturated and unsaturated regions are considered in this paper. Based on Darcy's law, a saturated-unsaturated seepage model is established. The seepage field is studied with the water head and saturation of the pressure measuring tube as variables. The infiltration line of seepage field is automatically captured according to the saturation distribution. (2) the saturated-unsaturated seepage calculation program is compiled by FORTRAN language, and the entity modeling of the research object is carried out on the basis of ANSYS software. The unit node information is imported into the preprocessing module of SP program and the unit topology relation file is generated. The main program is called to calculate and output the calculation result through TECPLOT software. (3) referring to the previous research results, Two typical examples are selected to verify the accuracy of SP program. (4) taking three recently completed dams as examples, the seepage in low permeability medium is simulated by SP program and the simulation results are analyzed. It provides a certain reference for seepage field prediction and engineering seepage prevention. The research result of this paper is that the saturated-unsaturated seepage model is established by considering the saturation region and the unsaturated region of seepage field, and the relevant calculation program is compiled by using FORTRAN speech, and the preprocessing and post-processing modules are optimized to a certain extent. The program is proved to be accurate and reliable by an example. The application of the program can be used to simulate the low permeability medium of the dam.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TV64
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，本文编号：2169745
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