【摘要】：尾礦壩內(nèi)堆存了易發(fā)生液化的飽和沙土材料,地震作用下尾礦壩易發(fā)生液化而喪失穩(wěn)定性,危及下游生態(tài)環(huán)境。因此,研究地震作用下尾礦壩的動(dòng)力響應(yīng)、動(dòng)力穩(wěn)定性和地震液化,提出相應(yīng)的抗震加固措施是十分必要和迫切的。 本論文依托一上游法尾礦壩——云南省昌寧縣雞街子尾礦壩工程實(shí)例開展研究,主要包括上游法尾礦壩的地震響應(yīng)、地震液化、壩體穩(wěn)定性以及抗震加固措施等方面內(nèi)容。論文具體研究?jī)?nèi)容為： (1)基于雞街子尾礦壩工程地質(zhì)勘察資料,通過現(xiàn)場(chǎng)試驗(yàn)以及尾礦材料的室內(nèi)直剪試驗(yàn)研究,得到了尾礦和相關(guān)材料的內(nèi)摩擦角和粘聚力指標(biāo)值；(2)基于非飽和土流固耦合理論及滲流理論,研究了雞街子尾礦壩的滲流規(guī)律；(3)采用經(jīng)典極限平衡法及有限元強(qiáng)度折減法研究了雞街子尾礦壩的靜力穩(wěn)定性；(4)采用時(shí)程分析法研究了地震作用下雞街子尾礦壩的動(dòng)力響應(yīng)規(guī)律,提出了地震作用下尾礦壩的動(dòng)力穩(wěn)定性安全系數(shù)；(5)采用Seed砂土液化判別方法對(duì)地震荷載下雞街子尾礦壩潛在的液化區(qū)域進(jìn)行判定；(6)研究了不同抗震加固措施的抗震效果,針對(duì)雞街子尾礦庫(kù)提出了相對(duì)有效的抗震加固措施。 論文研究結(jié)果表明：(1)尾礦庫(kù)處于正常工況時(shí),二維滲流計(jì)算結(jié)果與三維滲流結(jié)果相近；尾礦庫(kù)處于洪水工況時(shí),二維滲流計(jì)算數(shù)值普遍小于三維滲流計(jì)算數(shù)值；尾礦庫(kù)非飽和區(qū)域越大,流固耦合效應(yīng)對(duì)滲流的影響越顯著；(2)M-P法計(jì)算結(jié)果與強(qiáng)度折減法計(jì)算結(jié)果相近；極限平衡法不宜應(yīng)用于壩體潛在滑動(dòng)面位置的精確求解；(3)雞街子尾礦壩對(duì)輸入的地震時(shí)程荷載反應(yīng)較小,尾礦壩處于穩(wěn)定狀態(tài),但計(jì)算最小安全系數(shù)較小,尾礦庫(kù)的安全儲(chǔ)備不夠充分；(4)雞街子尾礦庫(kù)在地震作用下發(fā)生了震動(dòng)液化現(xiàn)象,但液化對(duì)尾礦壩的穩(wěn)定性影響較小。 論文的創(chuàng)新性工作主要包括：(1)論文采用了三維有限元開展尾礦壩地震響應(yīng)分析與研究,分析結(jié)果更符合實(shí)際；(2)論文針對(duì)地震作用下尾礦壩內(nèi)潛在的失穩(wěn)部位,提出了相對(duì)有效的抗震加固措施。
[Abstract]:The tailings dam is prone to liquefaction of saturated sandy soil materials. The tailings dam is prone to liquefaction and lose stability under the earthquake, which endangers the downstream ecological environment. Therefore, it is necessary and urgent to study the dynamic response, dynamic stability and seismic liquefaction of tailings dam under earthquake. Based on an upstream tailings dam-Jijiezi tailings dam project in Changning County, Yunnan Province, this paper carries out research, including the seismic response, seismic liquefaction, dam body stability and seismic reinforcement measures of the upstream tailings dam. The specific contents of this paper are as follows: (1) based on the engineering geological survey data of Jijie Zi tailings dam, the field test and the indoor direct shear test of tailings materials are carried out. The internal friction angle and cohesion index of tailings and related materials are obtained. (2) based on the fluid-solid coupling theory of unsaturated soil and seepage theory, the seepage law of Jijiesi tailings dam is studied, and (3) the static stability of the dam is studied by using the classical limit equilibrium method and the finite element strength reduction method. (4) the dynamic response law of Jijiezi tailings dam under earthquake action is studied by time history analysis, and the safety factor of dynamic stability of tailing dam under earthquake action is put forward. (5) the potential liquefaction area of Jijiezi tailings dam under earthquake load is determined by Seed sand liquefaction method. (6) the aseismic effect of different seismic reinforcement measures is studied, and the relatively effective seismic reinforcement measures are put forward for Jijiezi tailings reservoir. The results show that: (1) when the tailings reservoir is in normal condition, the results of two-dimensional seepage calculation are similar to those of three-dimensional seepage calculation, while the two-dimensional seepage calculation value of tailings reservoir is generally smaller than that of three-dimensional seepage calculation when the tailings reservoir is in flood condition. The larger the unsaturated region of tailings reservoir, the more significant the fluid-solid coupling effect on seepage flow; (2) the results of M-P method are close to those of strength reduction method, and the limit equilibrium method is not suitable for the accurate solution of potential sliding surface position of dam body. (3) the response of Jijiesi tailings dam to the input seismic time history load is small, the tailings dam is in a stable state, but the minimum safety coefficient is small, and the safety reserve of the tailings reservoir is not enough; (4) the vibration liquefaction of Jijiesi tailing reservoir occurred under earthquake, but the liquefaction had little effect on the stability of the tailings dam. The innovative work of this paper includes: (1) Three-dimensional finite element method is used to analyze and study the seismic response of tailings dam, and the results are more practical; (2) aiming at the potential instability of tailings dam under earthquake, the paper puts forward relatively effective seismic reinforcement measures.
【學(xué)位授予單位】：云南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TV649;TV312

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