东北多年冻土区露天煤矿回填后地温恢复影响因素分析

发布时间：2018-12-06 10:46

【摘要】：针对东北多年冻土区古莲河露天煤矿回填的问题,利用数值模拟方法,对露天煤矿回填后地温变化及影响因素进行分析。结果表明:影响地温恢复的主要因素是填土深度,其次是填土温度;气候变暖情景下,填土区地温呈现先降低后升高的趋势,起负影响的控制时间点是填土后50 a左右;填土对下覆及侧向区域的热影响随外界因素变化不大,影响范围在5 m内,影响时间在5 a内。其中,填土温度20℃、15℃、10℃及2℃,回填区地温可在27 a、21 a、16 a和10 a时恢复到0℃以下;回填深度2.6 m、10 m、20 m、30 m及40 m,填坑区域可在回填后1 a、9 a、27 a、65 a及114 a形成冻土;建立的统计回归模型与回填80 m数值分析结果吻合,验证了模型的可靠性;在此基础上,定量给出适宜回填施工作业季节和回填作业方式。
[Abstract]:In view of the problem of backfilling in Gulanhe opencast coal mine in permafrost region of northeast China, the variation of ground temperature and its influencing factors after backfilling in open-pit coal mine were analyzed by numerical simulation method. The results show that the main factors affecting the soil temperature recovery are the depth of the fill, the next is the temperature of the fill, and under the climate warming scenario, the soil temperature of the filling area decreases first and then increases, and the negative control time point is about 50 years after the filling. The thermal effect of the fill on the overlying and lateral regions is not changed with the external factors, the influence range is within 5 m, and the influence time is within 5 years. The filling temperature is 20 鈩，

本文编号：2365913