Study On The Direction Of Reclamation And Utilization Of Temporary Construction Land In Chongqing Coal Mine

The reclamation and utilization of temporary construction land in coal mines is an important way to realize the balance of cultivated land occupation and compensation,the increase and decrease of construction land,the steady advancement of ecological civilization construction,and the promotion of efficient and efficient use of land resources.However,due to the strong pressure of the temporary construction land of coal mines and the limitations of the factors affecting the direction of reclaiming land for temporary construction of coal mines,and the lack of technical standards or norms for the reclamation of coal mines,the temporary construction land of Chongqing coal mines has been reclaimed.The use of a single direction,low efficiency of reclamation,and the restoration and protection of the ecological environment cannot be effectively utilized.The reason is that the evaluation index system and the determination method of the reclaimed land use direction of coal mine temporary construction land are lacking,and the reclamation and reuse of any coal mine temporary construction land must be carried out on the basis of the determined reclaiming utilization direction.Therefore,it is very urgent and necessary to carry out research on the direction of reclaiming land for temporary construction of coal mines in Chongqing.In this regard,based on the research on land reclamation in coal mines at home and abroad,this paper analyzes the status quo and existing problems of temporary land reclamation in Chongqing coal mines,and constructs agricultural land from three aspects: suitability,driving force and binding force.The direction,construction land direction and ecological land use direction are used in the reclaiming direction evaluation index system of Chongqing coal mine temporary construction land.On this basis,the ecological suitability model and the triangular model are introduced to Chongqing Qijiang District.For example,an empirical study was conducted to determine the direction of reclamation of temporary construction land in Chongqing coal mines,with a view to providing reference for the reclamation and utilization of temporary construction land in Chongqing coal mines.The main conclusions are as follows:(1)The temporary construction land of coal mines in Chongqing has the characteristics of scattered distribution,large scale and small single block area,mainly due to pressure damage and damage,varying degrees of damage,large land load and high degree of hardening,including main industrial squares and stacking.Fields,explosives warehouses,mining roads,wind well sites,and gas drainage pumping stations account for approximately 59.14%,27.36%,2.08%,0.98%,10.17%,and 0.27% respectively.It has achieved certain results,and 477 reclaimed projects in the temporary construction land of coal mines in coal mine areas have been filed,but about 43% of the coal mine temporary construction land is still idle.The types of temporary construction land used for reclaimed coal mines are mainly cultivated land,forest land,grassland and garden land,accounting for 44.64%,43.99%,5.22% and 4.84% of the total area,respectively.(2)Constructing temporary construction land for Chongqing coal mines for agricul tural land,construction land and ecological land reclamation using eight factors includin g natural factors,economic factors and public will,from the perspectives of suitability,driving force and binding force using the direction evaluation index system can meet the needs of determining the direction of reclamation.(3)The average values of the ecological suitability index of different evaluation units for the temporary construction land of the coal mines in the study area are 0.5153,0.5495,0.5587,respectively,all of which are greater than 0.5,and the overall conditions are good,which is basically suitable for different reclamation.The direction is utilized,but the niche suitability coefficient of some evaluation units is low.Habitat conditions need to be improved or rectified with engineering or biological measures to improve the niche suitability and meet the different reclamation directions.In the unidirectional reclamation and utilization analysis,the appropriateness of agricultural reclamation showed “inverted pyramid” distribution that gradeⅠ(optimum)has the largest area,accounting for 44.94% of the land;the appropriateness of construction land and ecological land showed a shape of olive that the grade Ⅱ(suitability)has the largest area,accounting for 76.54% and 58.02%,respectively.In the analysis of comprehensive reclamation and utilization,agricultural land showed the most in number and area of evaluation units in each reclamation and utilization direction,followed by ecological land and construction land.The three kinds of land accounted for 46.29%,30.17% and 23.54% of the total area respectively,and the land reclamation in the Land Reclamation Regulations should comprehensively consider economic,social and ecological benefits.The concept of reclaiming land should be prioritized for agriculture.(4)The closer to the village,the higher the soil source guarantee rate,the better the irrigation and drainage conditions,the more suitable for reclamation and utilization as agricultural land.The ecological niche with high surface hardening rate,well-preserved surface buildings and large non-agricultural development is more suitable for reclamation and utilization as construction land.There are ecological niches in which the surrounding land is forest-grass land,with heavy geotechnical pollution and strong public willingness to restore forest.The more suitable it is for reclamation and utilization of ecological land.