气驱排渗技术及其在膏体尾矿筑坝工程的应用

果郎沟尾矿库为甲玛铜多金属矿二期工程配套尾矿库,采用初期坝+膏体上游法堆坝形式,实际运行过程中存在尾砂渗透系数低、不固结,且坝体浸润线埋深仅10 m左右等问题.华泰龙矿业公司采用气驱排渗技术,在坝体均匀布设特殊结构的竖直和水平排渗管,采用高压气驱和重力自流的联合排渗方式,大大提高了坝体排渗效率,浸润线埋深快速降低至20...     

浅谈水平排渗管在邱村金矿尾矿库治理中的应用

尾矿库生产管理中经常会出现坝体浸润线过高的现象,浸润线过高所带来的一系列问题直接影响坝体的稳定,威胁尾矿库的安全.本文浅述邱村金矿尾矿库浸润线过高的原因、水平排渗管在治理中的应用及效果.     

某钨矿尾矿库坝体渗水治理实践

某钨矿尾矿库坝体渗水严重,存在很大的安全隐患。通过对尾矿库岩土工程地质特征、土层渗透性、坝体渗流计算分析以及初期坝坝坡渗水原因分析,提出在初期坝坝面和排渗棱体顶部各增设一排水平排渗管,将坝体内尾矿渗透水及时引至坝坡排水沟后再排往下游,降低坝体内浸润线,以增强坝体稳定性。治理后初期坝坝面水平排渗管日最大排渗量696 m3,排渗棱体顶部水平排渗管日最大排渗量1 326 m3,解决了坝坡渗水问题,标高200 m浸润线比治理前降低了0.99 m,保证了坝体的稳定与安全。     

河南嵩县小南沟尾矿库堆坝稳定性分析

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...     

泉水沟尾矿坝三维渗流分析及渗透稳定性研究

针对设计方案计算分析了4种干滩长度运行工况下的尾矿库渗流场分布情况以及坝体浸润线埋深规律,为尾矿坝的各种运行工况下的渗流场渗流量预测计算,提供了一个较合理的模型和本尾矿坝各部分的渗流计算参数,对坝体设计、排渗设施提出合理性建议。     

某尾矿库坝体稳定性分析

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。     

降低金堆城栗西尾矿库坝体浸润线的技术

介绍大口辐射井与排水板水平垂直联合排渗系统在栗西尾矿库的施工及应用 ,并对排渗效果进行分析 ,证明大口辐射井与排水板联合排渗系统在降低尾矿坝体浸润线方面是十分有效的     

上游式尾矿库浸润线偏高原因浅析及治理措施

浸润线偏高将导致坝体稳定性降低,浸润线升高与尾矿性质、放矿管理、排渗设施的运行状况等因素密切相关。通过在浸润线偏高的坝体内增加水平或水平垂直联合排渗设施,提高坝体透水性,能有效降低浸润线。     

某尾矿库浸润线偏高探析及治理

随着矿山整合,打造绿色、和谐矿山的需求日益趋烈。矿山为极限利用矿石的可选性,就需进一步将尾矿粒度变细,将其有用成分最大化选别出来。湖南郴州某矿山主要生产钨、钼、铋和萤石等多金属矿,该矿山一在用尾矿库尾矿平均粒级dcp=0.038 mm,尾矿粒度-0.074 mm占82%,加之入库入量多,导致该尾矿库浸润线偏高、主坝和副坝坝坡面出现部分沼泽化现象。文章对该尾矿库浸润线偏高的原因进行探析和研究,提出清污分流、增设大口辐射井、排津盲井、垂直加水平联合排渗、初期坝实施水平排渗管、采用分级尾砂模袋法堆筑子坝等综合治理措施,将尾矿库浸润线有效降至控制浸润线埋深以下,坝体安全稳定性满足设计要求,进而保障了尾矿库的正常运行。     

陈坑尾矿库六级子坝坝脚渗流分析与治理

马坑矿业陈坑尾矿库六级子坝北岸由于三面环山,两处沟谷都有不断流山水,坝顶放矿往溢水塔流向矿浆有限,导致坝体渗流水加大,按设计排渗棱体导渗出现不足而从坝脚出现渗流现象,经过现场查看及分析,制定相应排渗治理措施,取得了较好效果,确保了尾矿堆积坝体安全。     

大口辐射井在尾矿库堆积坝排渗中的应用

In order to solve the problem that the saturation line of the dam body is shallow in the safety inspection of Dexing Copper Mine tailing dam of Jiangxi Copper Co., Ltd., and ensure the stability of the dam, the reasons for the shallow buried depth of the saturation line of the dam body are analyzed firstly. Then, considering the characteristics of different drainage methods of the tailings pond, combined with the actual situation of the No.2 tailings pond of Dexing Copper Mine, the addition of large radial wells and water is proposed through the establishment of seepage finite element calculation model, it is concluded that after adding large radial well and horizontal drainage layer, the buried depth of saturation line of tailings pond is obviously reduced, the influence range of large radial well is 128~184m, the elevation phreatic line is 5 ~ 12m lower than the current situation, and the average buried depth of phreatic line is 15m, which meets the design requirements under normal working conditions, the saturation line of the dam body is controlled to be 15m deep, which effectively ensures the stability of the dam body.     

排渗墙技术及排渗效果分析

对于初期坝为土坝的的尾矿库,后期随着尾矿的堆高,很容易造成坝坡渗水。现有的排渗设施———盲沟、管井、轻型井点、水平滤水孔、辐射井等可以起到一定效果,但不能大面积截断浸润线流线,没有解决悬挂水的影响,降水深度也不够理想。结合现有排渗措施提出排渗墙技术,经过工程实践表明,其有效性和可靠性均大幅提高。     

某钽铌矿尾矿库闭库整治工程设计研究

某钽铌矿尾矿库即将库满停用,进入闭库程序。整治设计采取了沿坝轴线射水造混凝土防渗墙、翻修排水棱体和加设溢洪道消力池及钢筋混凝土护面等整治措施。经渗流及坝坡稳定等分析计算,表明设计采取的整治加固措施具有较好的效果,满足尾矿库安全要求。     

Earth Dam with Toe Drain on an Impervious Base

The required height of a toe drain for a homogeneous earth dam on an impervious base has been determined considering reservoir water level, capillary rise for the embankment soil, free board, top width of the earth dam, embankment slopes, and tail-water position, such that the surface of seepage does not develop on the downstream sloping face of the earth dam and capillary saturation above phreatic line is contained well within the downstream sloping face. Using Kozeny’s analytic function, exact solution to the unconfined flow through an earth dam having parabolic equipotential boundaries on either side has been obtained. For straight toe drain face, and for various positions of tailwater, approximate toe drain heights and heights of surface of seepage have been determined using the Kozeny’s function and the method of fragments. It has been found that for an earth dam with 1/2 upstream slope, ?1/3 downstream slope, no tailwater, and 2?m capillary rise, capillary saturation is contained within the earth dam and the phreatic line is prevented from emerging on the downstream sloping face by providing a toe drain of height equal to 1/3 of the height of water level in the reservoir.     

基于小波分解的尾矿坝浸润线预测方法研究

为了准确预测尾矿坝浸润线的位置变化,结合浸润线埋深非稳定、非线性的时间序列以及动态变化的特点,利用小波分解与重构,提出基于小波分解的时间序列指数平滑法和BP神经网络法,采用时间序列的指数平滑法和BP神经网络方法分别对多个细节信号序列和逼近信号序列进行拟合预测,并对其拟合结果进行叠加,实现对尾矿坝浸润线的预测。将预测结果与实际监测数据进行对比,结果表明小波分解预测方法的预测结果与传统单一的指数平滑法和神经网络法预测结果相比,在预测精确度和拟合度方面：小波分解>指数平滑>神经网络。     

Determination of Length of a Horizontal Drain in Homogeneous Earth Dams

An earth dam can be prevented from a seepage failure due to softening of the downstream slope by providing a rock toe or horizontal drainage blanket. Analytical solutions are not available for determining the length of the filtered drainage blanket and downstream slope cover, though graphical solutions are available for them. Explicit equations have been obtained in the present work for calculating the downstream slope cover and the length of the downstream horizontal drain in homogeneous isotropic and anisotropic earth dams. Similar equations have also been obtained for maximum downstream slope cover and minimum and maximum effective length of the filtered drainage. These equations are nonlinear and representative graphs have been plotted for them covering all the practical ranges of the dam geometry. The numerical example demonstrates that the proposed equations are simple to use, hence the designers may find these equations as an additional check to their design by the conventional flownet method.     

Pseudotumor aspect of ovarian vein thrombosis

Peritoneal lavage is one of the interventional approaches that have gained some attention in the early, toxaemic phase of acute pancreatitis. Additionally some kind of drainage is necessary for suppurative collections that characterize the late phase of the disease. In both the above situations tube plugging is a common problem and it is usually associated with a relapse of the patient's septic state and newly formed collection(s) on abdominal CT. Two cases are presented, in early and in late phases respectively, in which drainage tube adoscopy (DTE) re-established tube patency and ensured drainage. DTE may represent an alternative to surgery or to CT-guided paracentesis and evacuation of newly formed intra-abdominal collections secondary to tube obstruction.