降雨对厚冲积层边坡稳定性影响  

Impact of Rainfall on Stability of Thick Alluvium Slope

作　　者：周靖人[1,2] 杨天鸿[1,2] 于庆磊[1,2] 刘洪磊[1,2] 李凤柱 南世卿[4] 

机构地区：[1]深部金属矿山安全开采教育部重点实验室,辽宁沈阳110819 [2]东北大学资源与土木工程学院,辽宁沈阳110819 [3]秦皇岛燕胜岩土公司,河北秦皇岛066000 [4]河北钢铁集团矿山设计有限公司,河北唐山063701

出　　处：《金属矿山》2014年第9期11-15,共5页Metal Mine

基　　金：国家重点基础研究发展计划项目(编号:2013CB227902);国家自然科学基金项目(编号:51174045);国家自然科学基金重点项目(编号:51034001)

摘　　要：边坡稳定是露天矿山安全生产的前提,降雨是影响边坡稳定性的重要因素之一,特别是对于第四系冲积层厚大的露天边坡,研究降雨的影响更加重要。结合研山露天矿东帮水文地质信息,对不同降雨强度下,地下水位埋深的变化及埋深变化之后对厚冲积层边坡的安全系数和地下渗流场分布的影响进行研究。模拟计算结果显示,矿山早期施工的堵水帷幕降低地下水位的作用不明显,地下水位埋深持续偏低,边坡细砂层和砾石层中含水丰富,形成了连贯的地下水运输通道,坡面出现漏水现象,在大降雨时,边坡涌水量急剧增加,边坡安全系数明显降低,有可能会出现滑坡等灾害。根据这一情况并结合现场现状,提出了边坡疏干排水措施,提高了边坡的稳定性,保证了矿山的安全稳定生产。Slope stability is the pre-condition of safety and production in open-pit mine and rainfall is one of the most im- portant factors that affect slope stability. Especially for thick alluvium open-pit slope,it is more important to study the effect of rainfall. Combining with the hydrological and geological data at eastern slope of Yanshan Iron Mine ,The changes of groundwater depth, and its impact on safety factors of the slope and the distribution of the seepage field under different rainfall conditions were studied. The simulation results showed that the existed water shutoff curtain at the early construction does not work well in lowering the groundwater level and the groundwater depth is constantly low. The fine sand layer and gravel layer in the slope are rich in water, forming a coherent groundwater transport corridor, and water leakage appears in the slope. In heavy raining, slope water inflow is increased dramatically, slope safety factor decreased obviously, and Landslide may occur. Based on this and the status quo, a method for drainage was proposed in order to improve the safety factor and ensure the safety and stable production of the mine.

关 键 词：渗流 安全系数 边坡计算 数值模拟 

分 类 号：TD824.7[矿业工程—煤矿开采]