Study On Ecological Safety Assessment Of The Coal Mining Collapse Area

With the generous exploitation of the coal, the gradual increase in the subsiding areahas destroyed the ecological structure of mining area seriously, and influenced the life ofthe mining area and surrounding area people. Although some subsiding areas have alreadybeen reclaimed, still it has not reached a more satisfactory security state. In such cases,how to carry on ecological safety evaluation in the subsiding mining area seemsparticularly important. At present, the ecological safety appraisal theory and method arenot riper yet. On the basis of absorbing the domestic and international relevant research incomprehensive appraisal of ecological safety, the safe comprehensive appraisal method ofthe ecology of subsiding areas and instance have been explored and studied in this text.This text has summarized the current situation and the trend studied in domestic andinternational ecological safety evaluation, summarized the ecological safety definition(means that the system can meet a kind of stable state (except military reasons) survivingand sustainable development of the human health), expounded the ecological safetycharacteristics and the function of ecological safety evaluation, probed into the researchpurpose, the meaning and the research contents of ecological safety evaluation of subsidingarea of mining, explained and mined the composition of the subsiding areas briefly, andanalyzed the influence of mining collapses on ecological safety of the area.According to the pressure-state-influence i.e. PSR (Pressure-State-Response)conceptual model, it has structured the safety evaluation index system of the ecology insubsiding areas, selecting two major indexes including natural environment and socialenvironment for use, set up the ecological grade of index of the subside area of mining,dividing every index into five grades, and introduced the linear comprehensive appraisalmethod of weighting and not-really-known estimating and appraising model these twokinds of methods.Adopting the analytical method of the level to confirm the weight of the safetyevaluation index of the ecology, we have carried on the safe comprehensive appraisal ofthe ecology in Tangshan south subsiding areas with linear weighting comprehensivemethod and the not-really-known estimating and appraising model, and through the safetycomprehensive appraisal of ecology of the subsiding areas in the south of Tangshan, theresult has indicated that 1) these two kinds of appraisal methods are suitable for theecological safety evaluation of the small area and the appraisal results of two kinds ofappraisal methods have consistency. 2) Tangshan south mine subsiding areas was in â…¡Grade ecology safe state in 2003, while in â…£Grade ecology safe state in 1992 and 1997,the main reason is that the government of Tangshan strengthened the administration of thesubside area of mining to the south since 1997.