考虑浸润线影响的细粒土尾矿坝加高方案变形特性和稳定性分析
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- 英文论文题名：DEFORMATION CHARACTERISTICS AND STABILITY ANALYSIS FOR A FINE-GRAINED SOIL TAILING DAM WHEN IT IS HEIGHTENED BASED ON THE INFLUENCE OF PHREATIC LINE
- 论文作者：张一军 ; 赵卓琛
- 英文论文作者：ZHANG Yijun ; ZHAO Zhuochen ; China Jikan Research Institute of Engineering Investigation and Design Co. ; Ltd.
- 年：2017
- 作者机构：机械工业勘察设计研究院有限公司;
- 论文关键词：细颗土尾矿坝 ; 加高 ; 浸润线 ; 变形特性 ; 稳定性
- 英文论文关键词：Fine-grained soil tailing dam ; Heightening ; Phreatic line ; Deformation characteristics ; Stability
- 会议召开时间：2017-04-18
- 会议录名称：2017年第九届边坡工程大会论文集
- 语种：中文
- 分类号：TV221.2;TV649
- 学会代码：ZJKC
- 会议名称：2017年第九届边坡工程大会
- 会议地点：中国浙江宁波
- 主办单位：中国建筑学会工程勘察分会
- 学会名称：中国建筑学会工程勘察分会
- 页数：10
- 文件大小：1570k
- 原文格式：D
- 会议级别：全国
摘要
为对受到浸润线影响的细粒土尾矿坝加高后的变形特性和稳定性进行分析,本文以陕西省四方金矿细粒尾矿坝为研究对象,在查明该尾矿坝工程地质特征及相应的物理力学参数的基础上,利用FLAC软件对该坝体的目前坝高(60m)和加高后的坝高(85m)分别在正常运行和洪水运行工况下的变形进行了数值模拟,得到了坝体水平位移等值线图、垂直位移等值线图以及位移矢量分布图,可以看出:洪水运行时不管是目前坝高还是加高后的坝体,其水平位移和垂直位移都在增大,并且在堆积坝和初期坝坝顶的结合处出现了向上的垂直位移;加高后不管是正常运行还是洪水运行时,相对于加高前,位移增加量更大。利用瑞典圆弧法对坝体的临界滑面进行了搜索,确定了各工况下对应的稳定系数,结果表明:坝体加高后,稳定系数明显降低,正常运行状态下,由现坝的1.42降低到加高后的1.136,洪水运行状态下,由1.358降低到1.104,需要采用加固措施提高其稳定性。
The tailing dam of Sifang Gold Mine in Shaanxi province is studied to get the deformation characteristics and stability of fine-grained soil tailing dam when it is heightened based on the influence of phreatic line. Through the engineering geological characteristics and the corresponding physical and mechanical parameters of the tailing dam, FLAC software is used to simulate the deformation of the dam at present dam height 60 meters and heightening dam height 85 meters under normal operation and flood operation. The contour map of the horizontal displacement, the contour map of the vertical displacement and the displacement vector distribution of the dam body are obtained. The results show that the horizontal and vertical displacement is increased under the flood condition whatever heighten or not, and it appears to be a upward vertical displacement at the junction of the stacking dam with the initial dam crest. And the displacement increment is larger after heightening the dam no matter under normal condition or flood condition. What's more, the critical slip surface of the dam is searched by using the Swedish slice method, and the stability factors under various conditions are determined. The results show that the stability factors of the dam decreased obviously after heightening. It declines from 1.42 to 1.136 under the normal operation condition, and declines from 1.358 to1.104 under the flood operation condition. So, curing measures should be done to improve the stability of the dam when it is heightened.
The tailing dam of Sifang Gold Mine in Shaanxi province is studied to get the deformation characteristics and stability of fine-grained soil tailing dam when it is heightened based on the influence of phreatic line. Through the engineering geological characteristics and the corresponding physical and mechanical parameters of the tailing dam, FLAC software is used to simulate the deformation of the dam at present dam height 60 meters and heightening dam height 85 meters under normal operation and flood operation. The contour map of the horizontal displacement, the contour map of the vertical displacement and the displacement vector distribution of the dam body are obtained. The results show that the horizontal and vertical displacement is increased under the flood condition whatever heighten or not, and it appears to be a upward vertical displacement at the junction of the stacking dam with the initial dam crest. And the displacement increment is larger after heightening the dam no matter under normal condition or flood condition. What's more, the critical slip surface of the dam is searched by using the Swedish slice method, and the stability factors under various conditions are determined. The results show that the stability factors of the dam decreased obviously after heightening. It declines from 1.42 to 1.136 under the normal operation condition, and declines from 1.358 to1.104 under the flood operation condition. So, curing measures should be done to improve the stability of the dam when it is heightened.
引文
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[7]毛肖杰,陈玉明,彭博.基于PFC2D对某钨矿尾矿库坝体稳定性研究[J].中国钨业,2015,30(5):22-28.MAO Xiao-jie,CHEN Yu-ming,PENG Bo.Slope Stability of the Tailings Dam in a Tungsten Mine Based on PFC2D[J].China Tungsten Industry,2015,30(5):22-28.
[2]杨丽红,李全明,程五一,等.国内外尾矿坝事故主要危险因素的分析研究[J].中国安全生产科学技术,2008,4(5):28-31.YANG Li-hong,LI Quan-ming,CHENG Wu-yi,et al.The analysis of main risk factors about tailings dam accidents at home and abroad[J].Journal of Safety Science and Technology,2008,4(5):28-31.
[3]赵坚,纪伟,刘志敏.尾矿坝地质剖面概化及其对渗流场计算的影响[J].金属矿山,2003,74(12):24-27.ZHAO Jian,JI Wei,LIU Zhi-min.Surveying of geological sections of tailings dams and its effect on seepage field calculation[J].Metal Mine,2003,74(12):24-27.
[4]胡明鉴,陈守义,郭爱国,等.某上游法尾矿坝抗滑稳定性浅析[J].岩土力学,2003,24(s2):254-258.HU Ming-jian,CHEN Shou-yi,GUO Ai-guo,et al.Opinions on the gangue dam anti-slide stability analysis[J].Rock and Soil Mechanics,2003,24(s2):254-258.
[5]段蔚平,汪斌.尾矿坝非饱和带滞水曲线模型的建立及应用[J].岩土力学,2003,24(s2):65-68.DUAN Wei-ping,WANG Bin.The establishment and application of the model for retention curve of unsaturated sections in tailings dam[J].Rock and SoilMechanics,2003,24(s2):65-68.
[6]李亚俊,张志军,刘玄钊,等.某尾矿坝稳定性的FLAC模拟分析[J].南华大学学报(自然科学版),2013,27(4):23-27.LI Ya-jun,ZHANG Zhi-jun,LIU Xuan-zhao.The Simulation and Stability Analysis on a Certain Tailings Dam by FLAC Software.Journal of University of South China(Science and Technology),2013,27(4):23-27.
[7]毛肖杰,陈玉明,彭博.基于PFC2D对某钨矿尾矿库坝体稳定性研究[J].中国钨业,2015,30(5):22-28.MAO Xiao-jie,CHEN Yu-ming,PENG Bo.Slope Stability of the Tailings Dam in a Tungsten Mine Based on PFC2D[J].China Tungsten Industry,2015,30(5):22-28.
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