季节性冻土区某露天矿山边坡变形规律研究

Study on slope deformation law of an open-pit mine in seasonal frozen soil area

为分析冻土融化、爆破振动及降雨因素对高寒地区露天矿山边坡稳定性的影响,采用合成孔径边坡雷达监测及无人机航测技术,对某矿山边坡进行连续不间断监测,研究冻土融化、爆破振动及降雨因素影响下边坡的变形规律。研究结果表明:受冻土融化影响,区域变形均发生在白天温度较高时间段,夜晚基本无变形累积;爆破振动对作业附近松散岩体影响较大,1天内变形基本出现在爆破振动作业后的2~3 h内,其余时间基本无累积,变形曲线呈阶梯状增长;降雨后采场坡顶表土层出现多个分散分布的沉降变形区域,变形曲线没有明显规律。研究结果验证合成孔径雷达监测技术的有效性,为分析采场变形诱因提供参考。

In order to analyze the influence of permafrost thawing,blasting vibration and rainfall on the stability of slope in the open-pit mines in alpine regions,the synthetic aperture slope radar monitoring and unmanned aerial vehicle survey techniques were used to continuously and uninterruptedly monitor the slopes of a mine located in Xiaoxinganling region,and the deformation law of slope under the influence of the above three factors was studied.The results show that due to the influence of permafrost thawing,the regional deformation all occur during the daytime when the temperature is high,and there is basically no accumulation of deformation at night.The blasting vibration has a relatively large impact on the loose rock mass in the vicinity of operation,and the deformation within a day basically occurs within 2~3 hours after the operation,but there is basically no accumulation during the rest of the day,and the deformation curve presents a stepwise growth.After rainfall,there are several scattered areas of settlement and deformation in the topsoil layer of the stope slope,and the deformation curve does not show any obvious law.The research results verify the effectiveness of synthetic aperture radar monitoring technology and provide a reference for analyzing the causes of stope deformation.