ZONING PREDICTION OF ENVIRONMENTAL ENGINEERING GEOLOGICAL PATTERN IN ECOLOGICALLY FRAGILE AREA OF SHAANXI

Ecologically fragile area of northern Shaanxi has coal resources with large mining thicknesses and shallow burial depths, so surface ecological environment is more sensitive and dramatic impact caused by underground mining, and it can easily lead to serious environmental engineering geological problems. Hongliulin was taken as a case study, and considered the main conditioning factors impacts on water resourcesand their quantitative indicators caused by coal mining, environmental engineering geological pattern of water contain with coal mining was mapped for the study area. Based on characteristic analysis of environmental engineering geology pattern types, we discussed the impact factors of environmental engineering geological pattern, and selected the thickness of seam, the thickness of laterite, the thickness of loess, the thickness of cover rock, and the spacing between seam and phreatic water, as the key impact factors of environmental engineering geological model. Using artificial neural network, evaluation model of environmental engineering geological patternin Hongliulin mine filed in GIS platform was built. And the environmental engineering geological pattern in the study area was zoned. The results show that the study area has four kinds of environmental engineering geological patternnamely, the environment-friendly, environment gradual recovery, environment gradual deterioration, and the environmental hazardpatterntype.