Research On Evaluation Of Surface Stability In Coal Mining Subsidence Area And High Efficient Land Utilization Model

Yulin City is rich in coal resources.While large-scale mining of coal resources promotes rapid social and economic development,it also causes huge damage to the local ecological environment.Coal mining not only pollutes and destroys land resources,but also causes ground subsidence to change the landform.This paper studies the efficient use of land in coal mining subsidence areas,and selects suitable utilization models for abandoned industrial and mining sites and land threatened by subsidence,which can improve the utilization efficiency of land resources in coal mining subsidence areas.This paper selects 12 coal mining subsidence areas in Xinmin Town,Fugu County as the research object,analyzes coal mining methods and overlying conditions,and uses probability integral method to calculate mining subsidence deformation.The calculation shows that the subsidence deformation is too large,indicating that the goaf will be For a long period of time,it will threaten the stability of the upper and adjacent ground surface,and each goaf will cause serious damage to the brick-concrete structures above.Based on the analysis of the impact of subsidence and combining with the geological characteristics of the study area,eight surface stability evaluation indicators were selected,and their weights were determined by the entropy weight method.The indicators were graded according to the purpose of land use.The surface stability of the coal subsidence area was evaluated,and the results of the classification were completely consistent,including 0 with high stability,4 with medium stability and 8with low stability.Based on the evaluation results of surface stability in the coal mining subsidence area,combined with the geographical location,traffic conditions,land use status of each area,and adjacent landscape distribution,suitable land efficient utilization models are proposed for each coal mining subsidence area: No.1 and No.3 could be used as arable land after repairing;after measures being taken,the open and flat area of No.4 could be used as arable land,and the narrow plots could be mixed with soil and water conservation forests and grasses;No.5could be built into a mine park;No.6,No.9 and No.10 were re-greened after treatment and could be mixed with soil and water conservation forests and grasses;No.2,No.7,No.8,No.11,and No.12 coal mining subsidence areas can be restored naturally.