The Destruction And Control Measures Of Mining Subsidence On Land Resources In Weibei Coal-mining Area

As the rapid development of coal-mining industry in resent year, the contradiction between the energy needs and environmental protection are increasingly aggravation, more and more serious damage of coal mining to environment, particularly the destruction of land resources. Study the destruction of mining subsidence on land resources and reveal the law of mining subsidence, which is important theory significance and the practical significance to choose the land reclamation measures and improve the productivity of land reclamation correctly, establish a scientific and reasonable standard of land expropriation and compensation costs, develop and utilize the subsidence of land resources reasonable, ensure sustainable development of coal industry.In this paper, the mining subsidence damage to land resources is divided into two forms: visible impact and invisible impact. The former mainly for the ground deformation, including the continuous deformation and discontinuous deformation; The latter is soil erosion caused by coal mining subsidence, soil erosion, desertification, marsh, and the soil moisture and soil fertility changes.To crack width / step height, additional slope, diving bit depth of these indicators as an evaluation parameter, situate the water conservancy facilities, plants growing and the impact on the land, divid mining subsidence damage to land resources intoâ… ,â…¡,â…¢,â…£four grades.To Tongchuan and Chenghe mine area in Weibei coalfield as research object. As a result of the underground mining, the visible destruction appears on the arable land such as crack, subsidence, and so on. Study of the mining subsidence impact on soil physical and chemical properties by the comparative soil water content, bulk density, porosity, partical size, pH, organic matter, N, P, K, bacteria, heavy metals of four soil samples from these two mine areas, show that the underground mining has a major physical and chemical impact on the soil, the largest influences reach to 116.55%, which provide the theoretical basis for the management and recovery of mining subsidence land resources.Puts forward prevention and control measures for the destruction of mining subsidence on land resources in weibei coal-mining areas, prevention of mining subsidence by analyzing the impact of factors of mining subsidence, improving the expected accuracy, and pre-assessmenting the withstand damage of coal mine geological environment. Reduce mining subsidence by selecting the reasonable mining methods. Control mining subsidence by engineering reclamation, soil remediation and other measures of ecological reconstruction.