Mining Damaged Land Reclamation Suitability Evaluation Research

This study,from the perspective of mine land reclamation,have an overallunderstanding of the natural geographical conditions and socioeconomic conditions of the mines in the study area.According to the different types of land damage in the study area,the evaluation objects are divided into two categories:subsidence area and pressure occupation area.The indicators are selected to construct the evaluation index system of mine land reclamation suitability.The entropy weight method is used to objectively assign the index,and the comprehensive index method is used for comprehensive evaluation to obtain the final direction of reclamation.(1)According to the different types of damage to land resources caused by coalmining,the study area is divided into two categories:subsided damage area and dumping area,and the damaged area is 3 731.86 hm2.There are two rows of dumping fields in the mining area.The total area is 38.64 hm~2.(2)The land damaged by subsidence has the characteristics of various types of damage,concealment and dispersion.The main features of the damaged land include serious pollution,concentrated distribution and heavy load.By analyzing the reclamation conditions in the study area,it is found that the subsidence area and the drainage field can meet the requirements of reclamation and earthwork;the coal mining subsidence has little impact on the water source of cultivated land,and the water source of cultivated land in the coal mine is sufficient;and the mine in the research area is in good profitability.The source of funds for reclamation is guaranteed;the strong willingness of local residents to recuperate is a prerequisite for rehearsal work to be carried out.(3)After repeated consideration of the primary selection indicators,and inviting relevant experts from the city to discuss and analyze the systemic,feasibility and local conditions of the primary selection indicators,the final indicators are determined as nine evaluation indicators which are the degree of land damage,soil texture,effective soil thickness,organic matter content,water source conditions,terrain slope,traffic conditions,distance from residential areas,and willingness to reclamation.In the damage area of the gangue hill field,six evaluation factors were selected including soil thickness,soil texture,bedrock properties,traffic conditions,surrounding land types and water source conditions.(4)According to the evaluation results of the constructed mine land reclamationevaluation index system,the gangue hill is not suitable for reclamation as cultivated land,but suitable for reclamation as forest grassland;in the evaluation of restrictive factors,the final reclamation direction of subsidence area 1 has no obvious change in the original land use direction.The subsidence area 2 is recommended to be reclaimed as cultivated land.The subsidence area 3 proposes to reclaim the original forest land into grassland.The cultivated land and grassland utilization mode is unchanged,and the cultivated land in the southwestern part of the subsidence area 4 is reclaimed as grassland.The forest and grassland types remain unchanged.The northwestern land types remain unchanged and the cultivated land is reclaimed as grassland in the northeast,and the forest and grassland fields remain unchanged.