地震作用下尾矿坝风险辨识及安全评价
发布时间：2019-06-14 13:23
【摘要】：尾矿库作为储存尾矿材料场地,储存的大量饱和尾矿砂易发生液化,是一个伴随工业化生产形成的高势能风险源。地震作用下一旦发生事故将会威胁到下游居住区的生存条件以及对生态环境造成的破坏难以再恢复,这些巨大损失都是难以估量的。所以,通过一系列的试验确定相关参数并用数值模拟的方法分析地震动力荷载下的尾矿库各个部位的动力特征,计算其震后稳定性,识别液化区域,并给出适合该尾矿坝的工程抗震加固方法和建议具有非常重要的现实意义。本文结合某上游法尾矿坝展开研究,主要包括相关尾矿砂的物理力学特性土工试验,渗流、静力稳定研究、地震动力响应、地震液化评价、抗震加固措施及评价等方面内容。论文具体研究内容为:(1)以尾矿坝作为主要风险辨识单元,识别了地震作用下风险并提出五种风险作用模型及相关风险指标的监测方法。(2)针对尾矿材料开展室内土工试验,开展固结不排水(CU)静力三轴试验测定了粗、细两种尾矿料的抗剪力学参数值;根据动力三轴试验的结果,获得了两种尾矿材料的初始液化所需的振动次数,以及动剪切弹模比与动剪应变关系曲线。(3)研究了尾矿坝的渗流规律并用有限元强度折减法研究了尾矿坝的静力稳定性。在最不利条件下对尾矿库现状坝体进行了地震动力响应分析,尾矿坝总位移最大值出现在坝坡中上部中心位置,液化区出现在上游临水库区,永久变形和永久位移均较小。(4)研究了尾矿砂液化评价方法并选择多种方法对库区潜在液化区域进行了识别,确认了尾矿库的安全状态。(5)研究了不同抗震加固措施,针对上游法尾矿库提出了相对有效的抗震加固措施并分析了抗震措施实施的效果。
[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.
【学位授予单位】：北方工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV312;TV649
本文编号：2499418
[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.
【学位授予单位】：北方工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV312;TV649
【引证文献】
相关硕士学位论文 前1条
1 张银浩;基于PFC的地震作用下湖南某尾矿坝稳定性数值模拟分析[D];南华大学;2018年
，本文编号：2499418
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