湿堆尾矿库降雨入渗效应及渍坝影响研究

发布时间：2018-05-24 10:49

  本文选题：湿堆尾矿库 + 降雨入渗　； 参考：《西南科技大学》2016年硕士论文

【摘要】：本论文旨在研究湿堆尾矿库的降雨入渗效应及溃坝影响。论文以四川某尾矿库为工程背景,利用相似模拟试验和数值模拟相结合的方式进行研究。首先通过降雨砂槽模型探究得出降雨入渗发展过程中入渗效应导致的坝体破坏表现为四个阶段:表面沼泽化—产生小范围横向裂缝—滑移面上移—大面积破坏,在此过程中堆积坝外坡越陡坝体含水率和孔隙压力变化越明显且与降雨强度呈正相关;利用水分垂直入渗试验归纳总结出入渗深度随着降雨强度的增加而增大,试验得出的不同工况条件下的入渗深度是数值模拟计算的数据基础;然后,采用数值模拟得出了坝体随入渗深度变化响应规律:坝体的稳定性、滑坡埋深与长度随降雨强度增大,坝体的破坏成坝脚—坝坡—坝顶—干滩的发展趋势,与砂槽模型试验结果相一致;最后,按照1:200的比尺设置户外尾矿库型泥石流的相似模拟试验,归纳总结出溃坝泥石流的影响性与不同溃坝程度总体成正相关,且粗糙程度越低泥石流的影响性越大。通过以上内容研究,完成了降雨过程中湿堆尾矿库的入渗效应,坝体的破坏规律以及溃坝后泥石流的影响性研究,从而得出降雨入渗效应—破坏规律—溃坝影响评估的闭环工程应用研究,具有十分重要的工程应用意义。
[Abstract]:The purpose of this paper is to study the effect of rainfall infiltration and dam break on wet pile tailings. Based on the engineering background of a tailings reservoir in Sichuan province, the similar simulation test and numerical simulation are used in this paper. Firstly, by exploring the model of rainfall sand trough, it is concluded that the dam body failure caused by infiltration effect in the process of rainfall infiltration development is manifested in four stages: surface swamping, producing a small range of transverse cracks, moving up the slip plane and destroying a large area. In this process, the change of water content and pore pressure in the steeper slope of the pile dam is more obvious and positively correlated with the rainfall intensity, and the infiltration depth increases with the increase of rainfall intensity by using the vertical infiltration test of water. The depth of infiltration under different working conditions is the data base of numerical simulation. Then, the response law of dam body with infiltration depth is obtained by numerical simulation: the stability of dam body, the stability of dam body, The buried depth and length of landslide increase with rainfall intensity, and the development trend of dam body failure is the same as that of sand trough model test, and the development trend of dam body is formed by dam foot, dam slope, dam crest and dry beach. According to the similarity simulation test of setting up scale of 1: 200 scale for outdoor tailings reservoir type debris flow, it is concluded that the influence of dam-break debris flow is positively correlated with different dam-break degree, and the lower the roughness is, the greater the influence of debris flow is. Through the above research, the infiltration effect of wet pile tailings during rainfall, the damage law of dam body and the influence of debris flow after dam break are studied. Therefore, the closed-loop engineering application study of rainfall infiltration effect, failure law and dam break impact assessment is of great significance.
【学位授予单位】：西南科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TD926.4
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本文编号：1928780