本文關(guān)鍵詞： 尾礦壩 降雨入滲 安全系數(shù) 數(shù)值模擬　出處：《南華大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：目前對尾礦壩的研究主要集中于尾礦壩的設(shè)計施工或者管理方面，，關(guān)于降雨對尾礦壩的影響的研究少之又少。然而尾礦壩的潰壩大多數(shù)都是在降雨期間發(fā)生的，所以研究降雨入滲對尾礦壩穩(wěn)定性的影響意義深遠。降雨入滲增加了壩體的飽和度，基質(zhì)吸力下降，使其抗剪強度大大下降，當(dāng)降水達到一定程度，壩體可能失穩(wěn)破壞，最終可能導(dǎo)致潰壩。本文的主要研究內(nèi)容及成果如下： (1)本文根據(jù)一個具體的尾礦壩，用ABAQUS模擬了降雨244860和72小時后的不同時刻的尾礦壩的孔壓位移應(yīng)力滲流速度以及體積含水率的變化。模擬結(jié)果表明隨著降雨的進行壩體上部孔壓增大，基質(zhì)吸力下降，壩體表面吸力下降，表層的孔壓此時暫態(tài)飽和。壩體的位移隨著壩高的增大而增大，在x方向的位移發(fā)生在淺層。隨著降雨的進行壩體的有效應(yīng)力不斷降低，特別是壩體所受的剪力開始下降，后來有所回升，但是幅度很小。在壩坡面上應(yīng)力變化隨著降雨進行而增加。應(yīng)變發(fā)生最大的地方在壩址處。從壩體的表層到深處，含水率整體上是上升趨勢。壩體中的水分由壩體的面層向內(nèi)部遷移，由壩頂向壩腳遷移。模擬結(jié)果可以很好的指導(dǎo)施工和設(shè)計工作。 (2)在暴雨工況下尾礦壩的安全受到了影響，ABAQUS給出的安全系數(shù)為1.15，此時超出了它的臨界值1，此時尾礦壩需要進行一些措施來排水。 (3)根據(jù)尾礦壩的勘探資料來和實際進行的數(shù)值模擬的尾礦壩的孔壓和位移隨時間變化的規(guī)律進行對比，來驗證模擬結(jié)構(gòu)的可靠性。選取了三個點來進行模擬，結(jié)果表明數(shù)值模擬的結(jié)果和尾礦壩勘探資料的結(jié)果吻合，表明模擬結(jié)果可以運用于實踐，成功預(yù)測了降雨的變化規(guī)律。
[Abstract]:At present, the research on tailings dam is mainly focused on the design, construction or management of the tailings dam, and the research on the effect of rainfall on the tailings dam is rare. However, the dam break of tailings dam mostly occurs during the rainfall period. Therefore, it is significant to study the influence of rainfall infiltration on the stability of tailings dam. Rainfall infiltration increases the saturation of the dam body, decreases the matrix suction, and greatly reduces its shear strength. When the precipitation reaches a certain degree, the dam body may lose stability and destroy. The main contents and results of this paper are as follows:. 1) according to a concrete tailings dam, the rainfall is simulated by ABAQUS. 48? 60 and 72 hours after the tailings dam at different times of pore pressure? Displacement? Stress? The simulation results show that with the increase of the pore pressure in the upper part of the dam, the suction of the matrix decreases and the suction on the surface of the dam decreases. The displacement of the dam body increases with the increase of the height of the dam, and the displacement in the x direction occurs in the shallow layer. The effective stress of the dam body decreases continuously with the rainfall, especially the shear force of the dam body begins to decrease. The stress changes on the slope of the dam increase with the rainfall. The largest strain occurs at the dam site. From the surface to the depth of the dam body, The moisture content in the dam body is moving from the surface layer to the inner layer and from the top of the dam to the dam foot. The simulation results can guide the construction and design work well. 2) the safety of tailings dam is affected under heavy rain condition. The safety factor given by Abaqus is 1.15, which exceeds its critical value 1. At this time, some measures are needed to drain the tailings dam. According to the exploration data of the tailings dam, the reliability of the simulated structure is verified by comparing the pore pressure and displacement of the tailings dam with the actual numerical simulation. The results show that the results of numerical simulation are in agreement with the data of tailings dam exploration, and the simulation results can be applied to practice, and the variation of rainfall can be predicted successfully.
【學(xué)位授予單位】：南華大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TV649;TV223

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