Research On The Impact Of Underground Engineering Excavation On The Above-ground Environmental Facilities And Safety Protection Measures

Underground mining in mines induces redistribution of stress fields in surrounding rocks and leads to surface subsidence.Therefore,predicting and analyzing the changing laws of the overlying rock and defining the scope of damage caused by surface movement have important practical significance and economic value for the safe production of coal mines,economic benefits and the protection of ground municipal industrial facilities.This paper studies the impact of coal pillar mining at the Laohutai-280m stage on important ground municipal facilities and related safety protection measures.The main research contents are as follows:(1)According to the engineering geology and mining design data of the mining area,considering the influence of the old mining area in the lower part,a systematic numerical simulation study was carried out on the mining process of the mining area,revealing that the-280m mining area and the previous multi-mining area were mined according to the actual mining time sequence and multiple mining areas.The law of surface deformation induced by the two mining methods of continuous mining in mining areas;as the number of adjacent mining areas increases,the overlying rock mass is damaged and disturbed more frequently,resulting in an increase in the range of movement and damage;compared with mining according to the actual mining time sequence,The superimposed deformation effect of continuous mining is more obvious,and the damage range is larger;(2)Combining the measurement results of more than 50 years and the"three under"coal mining regulations,the measured surface movement angle and movement boundary are determined,and the surface movement angle and movement boundary are finally defined,which provides a basis for the safety protection of Meidu Road;(3)Aiming at the damage characteristics of the overlying rock mass in the underground mining area,the numerical simulation method and the standard method are used to systematically analyze the possibility of underground water inrush induced by underground mining in a 100,000 m~3reservoir.Analyze,put forward the corresponding safety protection measures,and make a cost analysis of the 100,000 m~3reservoir plan for the relocation of the ground surface;(4)According to the actual situation of the-280m mining area and the spatial distribution of the municipal facilities on the ground,combined with the simulated deformation range and relevant regulations,the surface damage range was defined and the surface deformation monitoring system was designed;Specific measures and methods have been proposed for the restoration of the ecological environment in the old mining area of the mine.