高堆尾矿坝堆积特性及三维渗流数值分析研究  

Seepage Parameter Selection and Three-dimensional Seepage Inverse Analysis for Lixigou High Stack Dam

作　　者：郭振世[1,2] 仵彦卿[1,3] 詹美礼[4] 丁卫华[1] 

机构地区：[1]西安理工大学水利水电学院,陕西西安710048 [2]金堆城钼业集团有限公司,陕西华县714102 [3]上海交通大学环境科学与工程学院,上海200240 [4]河海大学水利水电工程学院,江苏南京210098

出　　处：《水土保持通报》2009年第3期188-192,共5页Bulletin of Soil and Water Conservation

基　　金：国家自然科学基金项目“变饱和介质中变形-渗流-化学过程耦合模型研究”(10572092)

摘　　要：栗西尾矿坝深钻孔勘探试验指标统计及多种原位测试结果分析表明,高堆尾矿坝深部的干容重指标要显著高于浅部,堆积坝体同一空间位置,同样埋深下干容重指标具有随时间明显增长的规律。提出了高堆尾矿坝稳定性分析中对同一类尾矿材料(如尾中砂、尾粉砂),可按早、中、后期分区统计选取力学指标的观点。采用改进子排水结构法精细模拟尾矿坝密集排水孔,采用减小干区渗透系数的不变网格模拟分析方法处理浸润面之上的虚拟流动,得到更加接近实际的尾矿坝三维渗流数学模型。采用复杂三维渗流控制分析计算程序,反演分析了现状坝高135 m的渗流场、浸润线及渗流量。计算分析结果与勘察剖面地下水位、观测总渗流量比较一致,误差不大于13%。同时表明在辐射井排渗系统作用下,可显著降低尾矿坝体潜水面,因此建立的渗控模型,可以应用于后期加高的计算分析中。Index statistic on deep borehole prospecting test and verification of various in-situ tests in Lixigou indicate that deep part survey index of high tailing dam is greater than shallow part. Under the circumstance of the same spatial location and the same depth of piling dam body, gravity index increases significantly with time. Physical indexes are selected by the early, middle, and late stages in the stability analysis of high tailing dam for the same material（medium sand silt）. Improved drainage structure method is adopted to simulate densely distributed drainage holes. By using complex three-dimensional seepage software（SPGCR-3. FOR）, the inverse analysis of saturation line and seepage discharge is made for a status dam of a height of 135 m. According to the fitting inverse analysis of drainage and seepage facilities, the mathematical model which conforms to the reality is obtained. The outcome from the analysis mentioned above coincides with the groundwater level in the survey section and observed seepage discharge, with the error less than 13%. Accordingly, the seepage model and stack-pile sedimentary seepage parameter are found, which can be applied to the analysis of dam heightening in late stage. It also demonstrates that radial wells can lower saturate line obviously.

关 键 词：尾矿坝 堆积特性 参数选取 三维渗流 数值分析 

分 类 号：S152.4[农业科学—土壤学]