Study On The Suitability Evaluation Of Land Reclamation In Shiguai Mining Subsidence Area Of Baotou City

As an important energy and raw material supply base for Baosteel's supporting construction,Shiguai District has made significant contributions to the production and construction of Baotou,but large-scale mining has also caused great damage to land resources and the ecological environment in Shiguai.Nowadays,all coal mines in the region have been shut down,and the transformation of the city is also progressing steadily.The restoration and reuse of the land damaged by the mine is inevitable.This paper takes the damaged land in the mining area of coal mining in Shiguai as the research object.On the basis of fully understanding the research focus and current situation of land reclamation and land suitability evaluation at home and abroad.Combined with the related theoretical research of geology,ecology,land evaluation and soil science,the following researches have been done on land reclamation in subsidence areas:(1)Based on the analysis of mine data,the damaged land in the subsidence area has been sorted and summarized,and divided into two types: excavation collapse damage and occupation loss.The geological disasters directly or indirectly caused by mining activities has been described.The impact of land destruction on the surface environment,water resources and topography of the mining area has been analyzed.(2)According to the type of land damage in the subsidence area,the evaluation unit was divided into two levels.Selecting two methods of land suitability evaluation and land quality evaluation to evaluate the suitability of damaged land Qualitative evaluation of land suitability for damaged land was carried out by using the limit condition method.The evaluation results show that the suitable direction for land reclamation in shanty towns is cultivated land,and other evaluation units are suitable for reclamation in woodland or grassland.Using the analytic hierarchy process,Matlab software,weighted index and method to carry out quantitative evaluation of the land quality of the damaged land,the quality levels of different evaluation units in different suitable directions were obtained.It was found that the main limiting factor affecting the suitability evaluation of the damaged land in the subsidence area was soil texture.,land consolidation,rock and soil pollution and degree of damage,which remind us to strengthen soil remediation measures during land reclamation(3)Based on the evaluation results of land suitability,combined with the characteristics and development needs of the mining area,this paper proposes land remediation measures covering the three aspects of geological disaster management,land reclamation and utilization,and landscape regeneration-resource integration.By making full use of existing resources and regional superior resources,the overall restoration and sustainable development of the research area can be achieved.