Thermal recovery process of a backfilled open-pit in permafrost area at the Gulian strip coal mine in Northeast China

作     者：GAO Shu-hui HE Rui-xia JIN Hui-jun HUANG Ya-dong ZHANG Jian-ming LUO Dong-liang 

作者机构：State Key Laboratory of Frozen Soils Engineering Northwest Institute of Eco-environment and Resources Chinese Academy of Sciences University of Chinese Academy of Sciences School of Civil Engineering Harbin Institute of Technology 

出 版 物：《Journal of Mountain Science》 (山地科学学报（英文）)

年 卷 期：2017年第14卷第11期

页      面：2212-2229页

核心收录：

学科分类：081901[工学-采矿工程] 0709[理学-地质学] 0819[工学-矿业工程] 08[工学] 0303[法学-社会学] 0818[工学-地质资源与地质工程] 0708[理学-地球物理学] 0705[理学-地理学] 0815[工学-水利工程] 0816[工学-测绘科学与技术] 0706[理学-大气科学] 0813[工学-建筑学] 0704[理学-天文学] 0833[工学-城乡规划学] 0713[理学-生态学] 0834[工学-风景园林学（可授工学、农学学位）] 

基　　金：supported by the research projects of the National Natural Science Foundation of China (Grant No. 41401081) "Thermal impacts of organic matter on properties of permafrost soils in the Da Xing'anling (Hinggan) Mountains" the State Key Laboratory of Frozen Soils Engineering, Ministry of Science and Technology, China "Impacts of human activities on the hydrothermal processes of permafrost in the Da Xing'anling (Hinggan) Mountains – a case study from the Gulian strip coal mine" (Grant No. SKLFSE-ZT-41) 

主　　题：Coal-mine open-pit backfill Numericalsimulation Thermal recovery process Sensitivityanalysis Gulian strip coal mine 

摘      要：Timely and proper backfilling of open-pits in strip coal-mines has been an effective measurement for the recovery of the hydrothermal regimes and ecological environment in permafrost regions. In this study, numerical simulations and statistical regressions were applied for analyzing the recovery processes of the backfill and its major influencing factors for the thermal equilibrium in recently backfilled open pits at the Gulian strip coalmine in Mo he, Northeast China. Results show that the thermal recovery time of backfilled areas is positively correlated to the backfill depth(BD) of the soils, the backfilled soil temperature(BST), and the mean annual ground surface temperature(MAGST); meanwhile, climate warming can impact on thermal regimes of the backfill area. The impact of climate warming on ground temperature of the backfill will show up significantly in about 50 years afterbackfilling(BD at 10.0 and 20.0 m, BST at 20.0°C) under the climate warming scenario(CWS) of 0.025°C·year ^(-1). Grey-relation analyses show that the sensitivity of the backfill recovery time declines in the order of the BD, BST and MAGST. On the basis of the abovementioned studies, the layer-by-layer backfilling in cold seasons is advised for more effective and more rapid recovery of thermal regimes of the backfilled open-pits in cold regions.