DISCUSSION ON THE SIMULATION OF COAL MINING SUBSIDENCE AREA AND?ECOLOGICAL TREATMENT PLAN

摘要

Aiming at the problem that the soft coal seam mining process in the Lianghuai mining area is prone to surface subsidence, this paper firstly carries out the triaxial mechanical experiment under the same confining pressure based on four soft coal smoky rock samples drilled in the field, and then performs the numerical simulation study of stratum defor-mation and surface subsidence. In addition, based on the experimental results, the eco-environmental treatment plan and model of subsidence area in min-ing area are discussed.The results show that:(1)The rock sample used is soft coal, the elastic modulus, Poisson's ratio, cohesion strength and intemal fric-tion angle are 586.25MPa,0.292,3.01MPa and 15.33°, respectively;(2)Based on experimental re-sults, the numerical simulation of the surface subsid-ence shows that as time goes by, the surface subsid-ence will become more and more serious. When the coal seam is excavated for more than 90 days, the maximum surface subsidence is 1.20m, and the sub-sidence range reaches 300m;(3)In the process of stratum mining, the four corners of the roadway will show different degrees of yield instability,and the maximum equivalent plastic strain reaches 0.0112 after 90 days of mining. This is mainly due to the occurrence of the stressconcentration in the overbur-den and underburden;(4)The settlements of 0.0m, 1.0m and 1.5m are the boundaries, and the condi-tions within the respective settlement ranges can be considered to adopt measures such as in-situ leveling, planting aquatic vegetables, and developing fisheries to achieve a win-win situation of ecological environ-ment management and the increased income.