井下采煤影响矿区坡面形态及侵蚀的数值模拟分析

发布时间：2018-03-08 11:34

本文选题：环境工程学　切入点：坡面形态　出处：《安全与环境学报》2016年04期 　论文类型：期刊论文

【摘要】：针对井下采煤产生的大范围岩移必然最终改变原有地表形态并影响坡面侵蚀特征及规律这一特殊性,从井下与地表相结合的新视角,结合彬长矿区水土流失特征和典型煤矿采矿条件,以采厚、地表坡面坡度等因素为变量,构建了20个不同类型的数值模型,通过数值模拟方法研究并揭示井下采煤对地表坡面形态及侵蚀的影响规律。结果表明,第一,地表坡面坡度会随采厚增加而呈现增大的趋势,且自然坡度越大,坡度变化量越大;相同采厚条件下,坡度增大率与坡面自然坡度整体上呈负相关。第二,地表坡面坡长会随采厚增加而呈现减小的趋势,且自然坡度越小,坡长变化量越大;随采厚增加,地表坡面坡长减小率与自然坡度呈先正相关后负相关的关系,自然坡度为26.57°是拐点。第三,采厚的增加会提高地表坡面产流产沙的强度,加剧坡面侵蚀,这种效应在坡度较小的坡面更加显著;井下采煤引起地表坡面坡度的增大是产生这一规律的主因。
[Abstract]:In view of the particularity that the large-scale rock movement produced by underground coal mining will eventually change the original surface shape and influence the erosion characteristics and laws of slope surface, a new angle of view combining downhole and surface is presented. Based on the characteristics of soil and water loss in Binchang mining area and the mining conditions of typical coal mines, 20 different types of numerical models are constructed by taking the factors such as mining thickness and slope of surface slope as variables. The influence of underground coal mining on surface slope morphology and erosion is studied and revealed by numerical simulation method. The results show that, first, the slope will increase with the increase of mining thickness, and the natural slope will increase. Under the same mining thickness, the increase rate of slope has negative correlation with the natural slope. Second, the slope length of surface slope will decrease with the increase of mining thickness, and the smaller the natural slope, the greater the change of slope length. With the increase of mining thickness, the decrease rate of slope length is positively correlated and then negatively correlated with the natural slope, and the natural slope is 26.57 掳as the inflection point. Thirdly, the increase of mining thickness will increase the intensity of runoff and sediment yield on the surface of the slope and increase the erosion of the slope. This effect is more obvious on the slope with lower slope, and the increase of slope caused by underground coal mining is the main cause of this rule.
【作者单位】：西安科技大学地质与环境学院;陕西省水利厅;
【基金】：国家自然科学基金项目(41402308) 陕西省教育厅科研计划项目(14JK1466) 陕西省水利厅水利科技项目(2015slkj-01) 西安科技大学博士启动费项目(2014QDJ006);西安科技大学培育基金项目(201308)
【分类号】：TD823

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