【摘要】：尾礦庫作為儲存尾礦材料場地,儲存的大量飽和尾礦砂易發(fā)生液化,是一個伴隨工業(yè)化生產(chǎn)形成的高勢能風險源。地震作用下一旦發(fā)生事故將會威脅到下游居住區(qū)的生存條件以及對生態(tài)環(huán)境造成的破壞難以再恢復,這些巨大損失都是難以估量的。所以,通過一系列的試驗確定相關(guān)參數(shù)并用數(shù)值模擬的方法分析地震動力荷載下的尾礦庫各個部位的動力特征,計算其震后穩(wěn)定性,識別液化區(qū)域,并給出適合該尾礦壩的工程抗震加固方法和建議具有非常重要的現(xiàn)實意義。本文結(jié)合某上游法尾礦壩展開研究,主要包括相關(guān)尾礦砂的物理力學特性土工試驗,滲流、靜力穩(wěn)定研究、地震動力響應、地震液化評價、抗震加固措施及評價等方面內(nèi)容。論文具體研究內(nèi)容為:(1)以尾礦壩作為主要風險辨識單元,識別了地震作用下風險并提出五種風險作用模型及相關(guān)風險指標的監(jiān)測方法。(2)針對尾礦材料開展室內(nèi)土工試驗,開展固結(jié)不排水(CU)靜力三軸試驗測定了粗、細兩種尾礦料的抗剪力學參數(shù)值;根據(jù)動力三軸試驗的結(jié)果,獲得了兩種尾礦材料的初始液化所需的振動次數(shù),以及動剪切彈模比與動剪應變關(guān)系曲線。(3)研究了尾礦壩的滲流規(guī)律并用有限元強度折減法研究了尾礦壩的靜力穩(wěn)定性。在最不利條件下對尾礦庫現(xiàn)狀壩體進行了地震動力響應分析,尾礦壩總位移最大值出現(xiàn)在壩坡中上部中心位置,液化區(qū)出現(xiàn)在上游臨水庫區(qū),永久變形和永久位移均較小。(4)研究了尾礦砂液化評價方法并選擇多種方法對庫區(qū)潛在液化區(qū)域進行了識別,確認了尾礦庫的安全狀態(tài)。(5)研究了不同抗震加固措施,針對上游法尾礦庫提出了相對有效的抗震加固措施并分析了抗震措施實施的效果。
[Abstract]:The tailing reservoir is used as the storage tailings material site, and the large amount of saturated tailing sand stored in the tailings pond is easy to be liquefied, and is a high potential energy risk source formed by the industrial production. In the event of an earthquake, it is immeasurable to threaten the living conditions of the downstream residential area and the damage to the ecological environment. Therefore, the relevant parameters are determined by a series of experiments and the dynamic characteristics of various parts of the tailings pond under the earthquake dynamic load are analyzed by a numerical simulation method, the post-earthquake stability is calculated, the liquefaction area is identified, It is of great practical significance to give the method and suggestion for earthquake-resistant reinforcement of the tailings dam. In this paper, the research on the development of the tailings dam of an upstream method mainly includes the physical and mechanical properties of the related tailings, such as the geotechnical test, the seepage, the static stability study, the seismic dynamic response, the seismic liquefaction evaluation, the anti-seismic reinforcement measures and the evaluation. The research content of the paper is as follows: (1) As the main risk identification unit, the tailing dam is used as the main risk identification unit, and the risk of the earthquake is identified and five risk-action models and related risk indexes are proposed. (2) carrying out indoor soil test on the tailing material, and carrying out static triaxial test of the consolidation and non-drainage (CU) to determine the shear mechanical parameter values of the coarse and fine tailings materials; according to the result of the dynamic triaxial test, the number of vibration required for the initial liquefaction of the two tailings materials is obtained, And the dynamic shear elastic modulus ratio and the dynamic shear strain relation curve. (3) The seepage rule of the tailings dam is studied and the static stability of the tailings dam is studied by the finite element strength reduction method. In the most unfavorable condition, the present dam body of the tailings reservoir is subjected to the seismic dynamic response analysis. The maximum displacement of the tailing dam is at the upper center of the dam slope, and the liquefaction area is located in the upstream and adjacent reservoir area, and the permanent deformation and the permanent displacement are both small. (4) The method of liquefaction and evaluation of tailing sand was studied and a variety of methods were selected to identify the potential liquefaction area in the reservoir area, and the safety status of the tailings pond was confirmed. (5) The different anti-seismic reinforcement measures are studied, and the relative effective anti-seismic reinforcement measures are put forward for the upstream method and the effect of the anti-seismic measures is analyzed.
【學位授予單位】：北方工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TV312;TV649

【引證文獻】

相關(guān)碩士學位論文 前1條

1 張銀浩;基于PFC的地震作用下湖南某尾礦壩穩(wěn)定性數(shù)值模擬分析[D];南華大學;2018年

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本文編號：2499418