【摘要】：非穩(wěn)定滲流問題是水利工程領(lǐng)域常見而又復(fù)雜的問題，，很多學(xué)者致力于研究如何建立合理有效的滲流數(shù)學(xué)模型，快速高效地確定出滲流自由面以及滲流場參數(shù)。由于非穩(wěn)定滲流問題本身的復(fù)雜性，如何采用數(shù)值計(jì)算方法進(jìn)行真實(shí)準(zhǔn)確的模擬是一個(gè)需要不斷完善的過程。 本文在前人研究的基礎(chǔ)上，收集整理了滲流自由面求解的幾種主要方法，對其優(yōu)缺點(diǎn)進(jìn)行了評述，并在變單元滲透系數(shù)法的基礎(chǔ)上提出了改進(jìn)方法，該方法能夠更加真實(shí)地模擬非飽和區(qū)的滲流情況。 根據(jù)滲流基本理論和有限元法基本原理，以福建某人工島填海工程為例，對其非穩(wěn)定滲流問題以及防滲優(yōu)化問題進(jìn)行了系統(tǒng)地研究，具體內(nèi)容如下： 通過ANSYS軟件有限元分析計(jì)算，進(jìn)行非穩(wěn)定滲流的數(shù)值模擬。由于本工程實(shí)例的特殊性，滲流過程中滲流損失量較大，導(dǎo)致內(nèi)河水位無規(guī)律變動(dòng)。本文通過APDL（ANSYS參數(shù)化設(shè)計(jì)語言）中的DO循環(huán)語句實(shí)現(xiàn)對計(jì)算時(shí)間域的離散細(xì)分，從而考慮了滲流量引起水位變動(dòng)對整個(gè)滲流分析的影響�？紤]人工島的功能性需求和安全性保障，進(jìn)行了防滲方案的優(yōu)化研究。通過非穩(wěn)定滲流計(jì)算，分析確定了人工島的防滲方案。以滲流量和滲透坡降為控制條件，以防滲體長度為變量，編寫APDL命令流。實(shí)現(xiàn)了防滲方案的優(yōu)化分析，對工程建設(shè)具有一定指導(dǎo)意義。
[Abstract]:The unsteady seepage problem is a common and complex problem in the field of water conservancy engineering. Many scholars have devoted to study how to establish a reasonable and effective seepage mathematical model to determine the seepage free surface and seepage field parameters quickly and efficiently. Due to the complexity of the unsteady seepage problem, how to use the numerical method to simulate the real and accurate flow is a process that needs to be perfected continuously. On the basis of previous studies, several main methods for solving seepage free surface are collected, their advantages and disadvantages are reviewed, and an improved method is put forward on the basis of variable element permeability coefficient method. This method can simulate the seepage in unsaturated region more realistically. Based on the basic theory of seepage and the basic principle of finite element method, the unsteady seepage problem and seepage control optimization problem of a artificial island reclamation project in Fujian Province are studied systematically. The main contents are as follows: through the finite element analysis and calculation of ANSYS software, the numerical simulation of unsteady seepage is carried out. Because of the particularity of the project, the loss of seepage in the seepage process is large, which leads to the irregular change of the water level of the inland river. In this paper, the discrete subdivision of the computational time domain is realized by the do cycle statement in APDL (ANSYS parametric design language, and the influence of the water level change caused by the seepage discharge on the whole seepage analysis is considered. Considering the functional requirement and security guarantee of artificial island, the optimization of anti-seepage scheme was carried out. Through the calculation of unsteady seepage, the seepage control scheme of artificial island is analyzed and determined. The APDL command flow was compiled with seepage flow and seepage slope as control conditions and the length of seepage control body as variable. The optimization analysis of seepage control scheme is realized, which has certain guiding significance for engineering construction.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TV223.4

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