共查询到17条相似文献,搜索用时 125 毫秒
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河南嵩县柿树底金矿小南沟尾矿库属山谷型尾矿库,为了确保尾矿库安全,在收集场地已有资料的基础上,开展堆场工程地质条件分析,研究尾矿堆积坝排渗、排洪状况、堆积坝体渗流特征,选择代表性的断面开展浸润曲线分析和稳定性验算分析,综合分析评价堆积坝坝体稳定性.研究结果表明:坝体无沉降、塌陷迹象,坝体无纵横向裂缝、变形现象,无明显位... 相似文献
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针对某尾矿库的现状,在现场调查的基础上,分析了尾矿初期坝和堆积坝坝体的组成结构,开展了尾矿工程特性研究和不同情况下的坝体稳定性研究,并探讨了坝体的灾害防治措施。研究结果表明:从放矿口至库内尾矿粒径由大变小,堆积尾矿由东向西整体上有西粗东细的特征;选取瑞典圆弧法、毕肖普法等对上游法尾矿库堆积坝稳定性进行分析比较,运用数值分析方法计算各种情况下尾矿坝的安全系数均大于1.25。为了保证坝体安全系数满足规范要求,必须保证坝体排渗设施安全有效运行,及时降低坝体浸润线高度。基于安全考虑,可依靠增加坝体自重和降低库内水位来减小坝体的滑坡风险。该研究成果能为尾矿库的灾害防治提供理论依据。 相似文献
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通过对尾矿堆坝的不利因素分析,探讨了安全管理、干滩面长度、堆坝坡度、渗透反滤以及浸润线高度对坝体稳定性的影响.结合生产实际,提出了主控因数,制定了相应提高尾矿堆积坝体稳定性的措施. 相似文献
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尾矿坝失稳致灾机理极其复杂,然而目前尾矿坝灾害防控缺乏对尾矿材料多尺度多因素耦合力学机制的深入研究,且细粒与高堆尾矿坝灾变机理不明确.针对尾矿坝致灾机理研究的基础共性问题,收集大量的国内外尾矿坝灾害紧密相关的研究领域的文献,综述有关筑坝尾矿结构多尺度表征描述与力学特性、筑坝尾矿沉积运动规律、尾矿坝成坝机理与坝体结构组成、尾矿坝稳定性分析与致灾机理等方面的研究现状及成果,指出目前研究存在的不足,凝练出尾矿坝灾害研究领域亟待解决的关键科学问题,并对未来的研究发展态势进行具体全面的展望. 相似文献
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本文通过剖析高寒地区细颗粒尾矿筑坝实例,深入讨论弛高寒地区细颗粒尾矿的沉积规律,沉积特性和尾矿坝稳定状况。结合设计实践论述了高塞地区细颗粒尾矿筑坝在采取一定的技术措施后,有效地提高了高寒地区细颗粒尾矿筑坝稳定性,彻底地解决高寒地区细颗粒尾矿筑坝问题。 相似文献
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尾矿粒度的细化,对尾矿库的稳定性及尾水排放质量产生了不良影响,结合会理锌矿尾矿库运行的实际情况,分析研究了尾矿库的稳定性,通过相对集中放矿和安装排渗体等方法,提高了尾矿库的安全性,保证了尾水的排放指标. 相似文献
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Sheng-hong Chen Ming-yi Xu Isam Shahrour Peter Egger 《Canadian Metallurgical Quarterly》2003,129(11):977-986
This paper presents the use of the trial load method and the block element method with elastoviscoplastic discontinuities for analysis of arch dams. The arch dam is considered as an arch-cantilever system and the foundation as a block element system. With the displacement compatibility condition at the contact surface of the dam and the foundation (including abutment), the governing equations of the arch dam and foundation are established. These methods are used for the analysis of the double curvature arch dam with complex geology conditions of the Xiaowan Hydroelectric Project in China. The deformation and stress states in both the dam body and the foundation are determined. Furthermore, the stability safety factors of the foundation and the abutment are calculated at the same time, which allows for an optimal design of the arch dam considering the strength, the deformation and the stability of the dam and foundation. 相似文献
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Earthquake Safety Evaluation of Gravity Dams Considering Aftershocks and Reduced Drainage Efficiency
This paper develops a methodology to perform seismic response analyses of concrete gravity dams considering aftershocks, and reduced drainage efficiency due to disruption of the drainage system. A database of earthquake records has been assembled to characterize main shocks and aftershocks. A drain finite difference hydraulic model considering laminar or turbulent two-dimensional flow in connecting cracks, geometrical distortions due to joint dilatancy while sliding, and misaligned drain segments is developed and validated. Coupled-hydromechanical analyses on the seismic response of a drained 90?m gravity dam are used to show the importance of cumulative displacements on the increase in uplift pressures, drain flow, and reduced sliding safety factors. Aftershock response is especially sensitive to the drainage system dimensions and model parameters, such as the foundation stiffness, and the number of potentially sliding joints. The proposed methodology forms the basis to develop displacement based performance criteria in stability evaluation of existing dams reevaluated for much higher ground motions intensities that they have been designed for many years ago. 相似文献