【摘要】：降雨入滲是導(dǎo)致土石壩失穩(wěn)的主要誘發(fā)因素，它會(huì)影響到壩體孔隙水壓力分布，很多壩體滑坡都與降雨有著直接而緊密的聯(lián)系。由于近年來(lái)降雨引發(fā)的邊坡失穩(wěn)越來(lái)越頻繁，因此，分析研究降雨入滲對(duì)邊坡穩(wěn)定性影響及預(yù)測(cè)滑坡發(fā)生的可能性，在工程應(yīng)用上具有非常重要的意義。本文在研究降雨入滲對(duì)土石壩坡滲流與穩(wěn)定的影響時(shí)，運(yùn)用飽和-非飽和滲流理論和壩坡穩(wěn)定分析理論，并利用有限元軟件模擬分析不同降雨條件下雨水入滲對(duì)壩坡滲流場(chǎng)及穩(wěn)定性的影響。研究的主要內(nèi)容有： (1)闡述飽和—非飽和滲流問(wèn)題的基本理論，從滲流的物理方程出發(fā)推導(dǎo)出飽和—非飽和滲流基本微分方程。在飽和滲流控制方程基礎(chǔ)上推導(dǎo)出飽和一非飽和滲流控制方程，給出了降雨條件下的邊界條件，并給出其定解條件。 (2)介紹有關(guān)降雨入滲的幾個(gè)常見(jiàn)模式，對(duì)雨水在土質(zhì)邊坡的入滲過(guò)程進(jìn)行分析研究。為了更好地理解降雨入滲數(shù)值模擬過(guò)程并得出正確的分析結(jié)果，針對(duì)數(shù)值模擬具體實(shí)施過(guò)程中需要注意到的關(guān)鍵問(wèn)題進(jìn)行了探討，如降雨入滲初始邊界條件的設(shè)置、土—水特征曲線的定義及滲透性系數(shù)函數(shù)的定義。 (3)敘述降雨入滲條件下土坡穩(wěn)定分析理論，介紹幾種常用的土坡穩(wěn)定分析方法，如極限平衡法、圓弧條分法。在土坡穩(wěn)定分析中把降雨入滲作為重要的影響因素，分析降雨入滲對(duì)壩坡穩(wěn)定影響機(jī)理。 (4)引用江西省鄱陽(yáng)縣濱田水庫(kù)工程實(shí)例，利用簡(jiǎn)單的二維土壩壩坡模型對(duì)不同降雨條件下壩體滲流和穩(wěn)定進(jìn)行分析，計(jì)算出不同降雨強(qiáng)度、降雨歷時(shí)、雨型和前期降雨等條件下的滲流場(chǎng)，并根據(jù)計(jì)算出來(lái)的滲流結(jié)果進(jìn)行了土坡穩(wěn)定分析，，得到相應(yīng)情況下壩坡穩(wěn)定安全系數(shù)變化規(guī)律，研究壩坡穩(wěn)定安全系數(shù)對(duì)降雨強(qiáng)度、降雨持續(xù)時(shí)間、雨型及前期降雨的敏感程度。 本論文的研究工作主要在于試圖改進(jìn)和完善土質(zhì)邊坡滲流與穩(wěn)定數(shù)值計(jì)算方法，對(duì)降雨誘發(fā)的邊坡失穩(wěn)機(jī)理和規(guī)律有進(jìn)一步的認(rèn)識(shí)�？蔀榻窈笏畮�(kù)除險(xiǎn)加固提供參考依據(jù)，也能為在雨季水庫(kù)壩坡滑坡預(yù)測(cè)和壩坡的設(shè)計(jì)提供科學(xué)依據(jù)。
[Abstract]:Rainfall infiltration is the main cause of instability of earth-rock dam, it will affect the distribution of pore water pressure in dam body, and many dam landslides are directly and closely related to rainfall. Because the slope instability caused by rainfall is more and more frequent in recent years, it is very important to analyze and study the influence of rainfall infiltration on slope stability and predict the possibility of landslide occurrence. In this paper, when studying the influence of rainfall infiltration on seepage flow and stability of earth-rock dam slope, the saturated-unsaturated seepage theory and the stability analysis theory of dam slope are applied. The influence of Rain Water infiltration on seepage field and stability of dam slope under different rainfall conditions is simulated by finite element software. The main contents of the study are as follows: (1) the basic theory of saturated-unsaturated seepage is expounded, and the basic differential equation of saturated-unsaturated seepage is derived from the physical equation of seepage. Based on the governing equation of saturated seepage, the governing equation of saturated-unsaturated seepage is derived, the boundary conditions under rainfall are given, and the definite solution conditions are given. (2) several common models about rainfall infiltration are introduced, and the infiltration process of Rain Water in soil slope is analyzed and studied. In order to better understand the numerical simulation process of rainfall infiltration and obtain the correct analysis results, the key problems that need to be paid attention to during the concrete implementation of the numerical simulation are discussed, such as the setting of the initial boundary conditions of rainfall infiltration. The definition of soil-water characteristic curve and the definition of permeability coefficient function. (3) the theory of slope stability analysis under rainfall infiltration is described, and several commonly used methods of slope stability analysis, such as limit equilibrium method and circular arc slice method, are introduced. In the stability analysis of soil slope, rainfall infiltration is regarded as an important influence factor, and the influence mechanism of rainfall infiltration on dam slope stability is analyzed. (4) citing the example of Bintian Reservoir Project in Poyang County, Jiangxi Province, using a simple two-dimensional earth dam slope model, the seepage flow and stability of dam body under different rainfall conditions are analyzed, and the different rainfall intensity and rainfall duration are calculated. According to the calculated seepage results, the stability analysis of soil slope is carried out, and the variation rule of stability safety factor of dam slope under the corresponding conditions is obtained, and the effect of stability safety factor of dam slope on rainfall intensity is studied, and the influence of stability safety factor of dam slope on rainfall intensity is studied. Rainfall duration, rainfall type and the sensitivity of previous rainfall. The main research work of this paper is to improve and perfect the numerical calculation method of seepage flow and stability of soil slope, and to further understand the mechanism and law of slope instability induced by rainfall. It can be used as a reference for reservoir reinforcement in the future as well as a scientific basis for landslide prediction and design of dam slope in rainy season.
【學(xué)位授予單位】：南昌大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TV223.4

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