發(fā)布時間：2018-12-06 10:46

【摘要】：針對東北多年凍土區(qū)古蓮河露天煤礦回填的問題,利用數(shù)值模擬方法,對露天煤礦回填后地溫變化及影響因素進行分析。結(jié)果表明:影響地溫恢復(fù)的主要因素是填土深度,其次是填土溫度;氣候變暖情景下,填土區(qū)地溫呈現(xiàn)先降低后升高的趨勢,起負影響的控制時間點是填土后50 a左右;填土對下覆及側(cè)向區(qū)域的熱影響隨外界因素變化不大,影響范圍在5 m內(nèi),影響時間在5 a內(nèi)。其中,填土溫度20℃、15℃、10℃及2℃,回填區(qū)地溫可在27 a、21 a、16 a和10 a時恢復(fù)到0℃以下;回填深度2.6 m、10 m、20 m、30 m及40 m,填坑區(qū)域可在回填后1 a、9 a、27 a、65 a及114 a形成凍土;建立的統(tǒng)計回歸模型與回填80 m數(shù)值分析結(jié)果吻合,驗證了模型的可靠性;在此基礎(chǔ)上,定量給出適宜回填施工作業(yè)季節(jié)和回填作業(yè)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，

本文編號：2365913