徐州西部关闭矿井地表次生沉陷监测与分析

Monitoring and analysis of surface secondary subsidence of closed mines in Western Xuzhou

针对矿井关闭后,覆岩和地表发生沉陷而出现的各种安全问题,该文基于2014年1月17日—2018年1月8日的51景德国X频段陆地合成孔径雷达(TerraSAR-X)卫星影像和斯坦福小基线集技术获取了徐州西部关闭矿井(张小楼矿、夹河矿和庞庄矿)4年地表时序沉陷数据。监测结果表明:观测期内张小楼矿、夹河矿和庞庄矿关闭后地表呈现持续下沉的趋势。其中,张小楼矿和夹河矿关闭后,前8个月内沉降速率依然较快,之后沉降速率减缓,在监测末期地表出现上升;庞庄矿沉降速率总体较为平缓,在监测末期地表也出现上升。综合三个矿井的沉降规律,可将关闭矿井的次生沉陷概括为下沉速度较快阶段,下沉速度放缓阶段和逐渐上升阶段。该研究可为防治关闭矿井次生沉陷灾害和关闭矿井老工业基地综合治理提供参考。

In view of various safety problems caused by overburden and surface subsidence after mine closure,this paper based on 51 German X-band land synthetic aperture radar(TerraSAR-X)images from January 17,2014 to January 8,2018 and Stanford method for small baseline subsets technology,obtained four-year time series surface subsidence data of closed mines(Zhangxiaolou mine,Jiahe Mine and Pangzhuang mine)in western Xuzhou.The monitoring results show that during the observation period,the surface of Zhangxiaolou Mine,Jiahe mine and Pangzhuang mine will continue to sink after being closed.Among them,after Zhangxiaolou mine and Jiahe mine were closed,the settlement rate was still fast in the first 8 months,then the settlement rate slowed down,and the surface rose at the end of monitoring.The subsidence rate of Pangzhuang mine is generally gentle,and the surface also rises at the end of monitoring.According to the settlement laws of the three mines,the secondary subsidence of closed mines can be summarized as a fast sinking stage,a slow sinking stage and a gradual rising stage.This study can provide a reference for the prevention and control of secondary subsidence disasters and comprehensive treatment of old industrial bases in closed mines.