本文選題：尾礦壩 + 滲透變形��； 參考：《長(zhǎng)安大學(xué)》2014年碩士論文

【摘要】：尾礦壩壩體滲透變形是引起潰壩的主要原因，該問題一直被水利工程所重視。滲透變形初期常伴隨發(fā)生局部塌陷、壩基及壩體滲水、水位異常、土體沉降等現(xiàn)象。隨著滲透變形的繼續(xù)發(fā)展，在巖土體中形成滲透通道或洞穴，將直接導(dǎo)致壩體穩(wěn)定性迅速降低，甚至壩體失穩(wěn)。因而，滲透變形的研究，不同工況下靜力穩(wěn)定性分析以及地震作用下動(dòng)力穩(wěn)定性分析是壩體工程安全預(yù)測(cè)、后期優(yōu)化堆積的必要前提。 本文以某尾礦壩為例，首先從滲透變形的必要條件和水力學(xué)角度分析了該壩體滲透變形的可能方式與路徑，了解滲透變形產(chǎn)生的機(jī)理、條件，為滲透變形的防治提供資料。然后針對(duì)該壩出現(xiàn)的塌落坑和壩基滲水現(xiàn)象，應(yīng)用不同的研究方法，諸如：現(xiàn)場(chǎng)調(diào)查、原位測(cè)試、連通試驗(yàn)、出水地段水質(zhì)分析、壩體地下水位研究等，進(jìn)行成果分析并得出滲透變形的特征、原因、方式及發(fā)展趨勢(shì)。從而建立一套有效的滲透變形研究程序，，對(duì)類似實(shí)際工程問題提供參考。 其次，鑒于滲流場(chǎng)的特征與滲透變形、壩體穩(wěn)定性有著直接關(guān)系，本文運(yùn)用Geo-studio軟件的seep模塊，對(duì)壩體的滲流場(chǎng)進(jìn)行了模擬�；谀M效果圖，對(duì)壩體侵潤(rùn)線的特征、逸水點(diǎn)的位置、孔隙水壓力特征等進(jìn)行了分析。進(jìn)而得出影響壩體滲流場(chǎng)的宏觀因素：上下層滲透系數(shù)比、水面線起伏、干灘長(zhǎng)度。為壩體的安全管理、穩(wěn)定性控制起到關(guān)鍵作用。 最后，本文運(yùn)用Geo-studio軟件的Slope模塊及Slope/Quake耦合，對(duì)該壩體不同工況下壩體靜力穩(wěn)定性、動(dòng)力穩(wěn)定性進(jìn)行了計(jì)算分析。由于滲流通道較小，且目前滲透變形僅為初期發(fā)展階段，所以很難在模擬中考慮到滲透變形，本文僅以正常壩體為模擬對(duì)象進(jìn)行分析。根據(jù)不同工況下穩(wěn)定系數(shù)的比較，得出干灘長(zhǎng)度、侵潤(rùn)線高低、相鄰地層滲透系數(shù)的差異等對(duì)壩體穩(wěn)定性的影響。通過對(duì)壩體地震作用下動(dòng)力穩(wěn)定性的模擬，分析了地震作用下壩體內(nèi)部應(yīng)力、應(yīng)變、位移等的特征規(guī)律，分析了地震過程中壩體的穩(wěn)定性變化特征。
[Abstract]:Seepage deformation of tailings dam is the main cause of dam break. In the early stage of seepage deformation, local collapse, seepage of dam foundation and dam body, abnormal water level and settlement of soil are often accompanied. With the continuous development of seepage deformation, the formation of seepage channels or caves in rock and soil will directly lead to the rapid decrease of dam stability and even the instability of dam body. Therefore, the study of seepage deformation, static stability analysis under different working conditions and dynamic stability analysis under seismic action are the necessary prerequisites for dam safety prediction and post-optimization accumulation. Taking a tailings dam as an example, this paper first analyzes the possible ways and paths of seepage deformation of the dam from the point of view of the necessary conditions and hydraulics of seepage deformation, understands the mechanism and conditions of seepage deformation, and provides data for the prevention and control of seepage deformation. Then, in view of the seepage phenomenon of the cave-pit and the foundation of the dam, different research methods are applied, such as field investigation, in-situ test, connection test, water quality analysis of the effluent section, research on the groundwater level of the dam body, etc. The results are analyzed and the characteristics, causes, methods and development trend of osmotic deformation are obtained. Thus a set of effective seepage deformation research program is established to provide reference for similar practical engineering problems. Secondly, in view of the direct relationship between seepage field and seepage deformation and stability of dam, the seepage field of dam is simulated by using seep module of Geo-studio software. Based on the simulation results, the characteristics of the embankment line, the location of the water escape point and the pore water pressure are analyzed. Then the macroscopic factors affecting seepage field of dam body are obtained: permeability coefficient ratio of upper and lower layers, fluctuation of water surface line and length of dry beach. Stability control plays a key role in the safety management of dam body. Finally, the slope module of Geo-studio software and Slope / quake coupling are used to calculate and analyze the static and dynamic stability of the dam under different working conditions. Because the seepage channel is small and the seepage deformation is only at the initial stage, it is difficult to consider the seepage deformation in the simulation. This paper only takes the normal dam body as the simulation object to analyze the seepage deformation. According to the comparison of stability coefficient under different working conditions, the influence of dry beach length, the height of embankment line and the difference of permeability coefficient of adjacent strata on the stability of dam body are obtained. Based on the simulation of the dynamic stability of the dam under earthquake, the characteristics of stress, strain and displacement in the dam under earthquake are analyzed, and the variation characteristics of the stability of the dam during the earthquake are analyzed.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TV649;TV223.4

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5 汪

本文編號(hào)：2061873