尾矿库土石初期坝坡面沼泽化治理措施

Treatment of Slope Swamping of Earth-rock Starter Dam of Tailings Pond

对于初期坝为透水堆石坝、后期采用尾砂筑坝的上游式尾矿库,由于库水位高、干滩长度短、尾砂渗透性差、堆积坝坡陡、未设置排渗设施等原因,往往在后期尾矿堆积坝坡面出现沼泽化现象。目前对这种堆积坝坡面沼泽化的治理已积累了丰富的经验,而对于土石初期坝沼泽化现象,因出现较少,研究不多,治理措施也较少。通过对初期坝坡面沼泽化的原因分析和治理措施比选,将水平排渗管用于尾矿库土石初期坝坡面沼泽化治理中,根据浸润线观测及现场查看,经治理的土石初期坝浸润线埋深逐步降低、坡面沼泽化消除、坝体稳定性逐步提高,具有良好的治理效果。采用水平排渗管可消除土石初期坝沼泽化,施工中积累的经验可为类似工程治理提供借鉴。

For upstream tailings pond with permeable rock-fill starter dam,slope swamping of tailings-fill dam is often found in later stage due to high water level,short dry beach,inadequate tailings permeability,steep slope,or absence of seepage facilities. We have rich experiences in the treatment of such slope swamping,but researches and treatment measures on the swamping of earth-rock starter dam are rare. Through analyzing the causes of starter dam swamping and comparing the treatment measures,we applied horizontal seepage draining pipes to the treatment. By observation and on-site investigation,we found that the depth of saturation line of earth-rock starter dam gradually declined,slope swamping diminished,and the dam＇s stability improved. Through the experience we conclude that horizontal seepage draining pipes could eliminate the swamping of earth-rock starter dam.