崩落法开采塌陷区上覆黄土层降雨入渗机理研究  

Study on mechanism of rainfall infiltration through overlying loess formation on block caving collapse area

作　　者：付建新[1] 谭玉叶[1] 宋卫东[1] 

机构地区：[1]北京科技大学金属矿山高效开采与安全教育部重点实验室,土木与环境工程学院,北京100083

出　　处：《中国矿业大学学报》2015年第2期349-353,366,共6页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(51274023);中央高校基本科研业务费专项资金项目(FRF-SD-12-003A)

摘　　要：以程潮铁矿东区为工程背景,东部塌陷区上覆黄土层为典型的非饱和土,基于非饱和土中水的基本运动方程建立了降雨一维入渗数学模型,并编制了计算程序;对不同条件下的入渗过程进行了详细分析,并研究了开采强度对降雨入渗时间的影响规律,计算得到了不同条件下雨水渗透通过整个黄土层所需的时间.结果表明:黄土层的雨水入渗与降雨强度和土体初始体积含水率等有密切的关系,其中土体初始体积含水率影响程度较大,初始体积含水率越大,雨水入渗速度越快;入渗时间随开采强度的增加呈指数增长,表明崩落开采对上覆黄土层的雨水入渗有显著的影响.研究成果可为降雨情况下井下水量的变化规律提供理论依据,并为井下泥石流灾害预测预报提供重要参考.In this study, we take the caving mining in Chengchao Iron as engineering back- ground. The overlying unsaturated loess formation on block caving collapse area is typical un- saturated soil. Based on the moisture migration basic equations of unsaturated soil, the one-di- mensional infiltration model of unsaturated soil was constructed and the calcualting program was coded. Infiltration process under different rainfall conditions and soil conditions is analyzed in detail and the influence of mining intensity on infiltration time is studied to obtain the time of rainfall infiltration through overlying loess formation. The results show that the infiltration law in the loess formation is closely related to rainfall intensity and initial moisture content, es- pecially the initial moisture content, the larger the initial moisture content, the faster the infil- tration. Influence law of mining disturbance on infiltration time showed exponential form. The results show that the influence of block caving on infiltration in the loess formation is very sig- nificant. The research can provide theoretical basis for the variation of underground water un- der rainfall and important reference for underground debris flow forecast.

关 键 词：崩落法 塌陷区 降雨入渗 入渗时间 井下泥石流 

分 类 号：TD803[矿业工程—矿山开采]