Coal Mining Subsidence Impacts On Tetraena Mongolica And Its Protection

Tetraena mongolica is called as panda in the plant family and it is the grade one ofnational protected plants. The mining subsidence’s impacts on Tetraena mongolica’s growth wasstudied to find an environmental friendly coal mining solution by using field investigation,laboratory test, remote sensing and scenario simulation. The research results are significant forchoosing optimization coal mining solution to protect the other special vegetation.Firstly, it is found that Tetraena mongolica is of the typical desert characteristics, withsporadical distribution, small spatial variation and autocorrelation range by using the remotesensing technique. The Tetraena mongolica ESV’s evaluation system associated with NDVI,which includes producing organic matter, refining environment, balancing air, holding water,biodiversity, protecting soil, resisting wind and fixing sand into consideration. This system canbe regarded as a reference to analyze the environment cost of coal mining. Since the explorationaround the Tetraena mongolica is violent, there are many open pits, stock dump of gangue androads. The soil, coal, coal gangue were sampled at different location to test the content of variouselements. It displays that a lot of vegetation was destroyed; and accumulation of Cd, Hg and Pbetc. in the Tetraena mongolica’s area was induced by these adjacent mining activities.Secondly, we put forward that controlling the surface deformation and fissures is the key toprotect Tetraena mongolica. The computing model of the surface tensile strain was deducedbased on the theories of mining subsidence. The relationship between mining thickness and thesurface tensile strain was analyzed.It is found that the maximum surface tensile strain has a linear relationship with the root’sdiameter; the root tensile strength declines while the diameter rises by testing the tensileresistance of Tetraena mongolica. Therefore, the surface deformation threshold values whichmatch the three damage levels according to the relationship between stress and strain were putforward. A quantitative evaluation model for computing the injury of Tetraena mongolica rootwas provided, which could provide a theoretical basis for analyzing the surface subsidence’sdamage to Tetraena mongolica’s root induced by different coal mining methods.In the end, the relationships between the tensile resistance capacity of Tetraena mongolicaand the deformation respectively caused by all caving method, strip method, filling method wereanalyzed by using scenario simulation. On this basis, the filling mining method was put forwardas the technical countermeasures to protect Tetraena mongolica.