綦江铁矿尾矿库加高扩容的稳定性研究

为研究尾矿库加高扩容以及浸润线升高对其稳定性的影响,以重庆綦江铁矿尾矿库为研究对象,利用瑞典条分法分别计算现有尾矿库及其加高扩容后在正常水位及洪水位状态下的安全系数。计算结果表明,现有尾矿库在正常水位及洪水位状态下安全系数分别为1.90、1.63,均大于规范所规定的最小安全系数1.1,洪水位状态下安全系数较正常水位降低14.21%;尾矿库加高扩容后在2种水位下安全系数分别为1.27、1.17,尾矿库加高扩容引起安全系数降低。尾矿库加高扩容及浸润线高度升高,导致尾矿库安全系数有较大降低,几乎没有安全储备,滑动面深度及滑体半径有显著增大。因此,建议尾矿库加高扩容后应控制尾矿库浸润线位置,同时增强保护措施,加强监测管理,规范运行,防止尾矿库发生垮塌事故。

Research on Stability of Tailing Pond in Qijiang Iron Mine After Storage capacity Enlarging

Qijiang Iron Mine's tailing pond is selected as an object to study the effect of capacity dilatation and saturation line increase on the stability of tailing pond.Safety factors of the orginal tailing pond and the tailing pond after enlarging capcacity under normal water level and flood level are calculated by using Sweden slicing method.As a result，the safety factor of the present tailing pond under normal water level and flood level are 1.90 and 1.63 respectively，which are all greater than 1.1 that is the minimum safety factor stipulated by the corresponding specifications.The safety factor under flood level decreases by 14.21%，compared to that under normal water level.Safety factor of tailing pond after enlarging capacity under two water levels are 1.27 and 1.17，so the enlarging results in the lower safety factor.It can be seen that the safety factor of tailing pond decreases with the increase of storage capacity and saturation line；however，the volume and radius of the sliding body increase largely.Although the safety factor of the tailing pond after enlarging capacity is still greater than the minimum safety factor，it has little emergency capacity.Thus，it is suggested that the saturation line of the tailing should be controlled after enlarging capacity，and the protective measures and monitoring management should be enhanced to avoid the happen of accidents after enlarging the capacity of tailing pond.