基于GIS的AHP型常权模型与分区变权模型的底板突水脆弱性评价

Comparison of GIS Based Water Inrush Coefficient Method and AHP Vulnerability Index Method in Application

通过运用GIS技术,利用脆弱性指数法在承压含水层、地质构造、底板隔水层3个层次下建立了主控因素专题图,运用层次分析法确定常权模型的各项权重,采用分区变权理论方法调整各个主控因素权重,得到一个合理的组合,改善了常权模型下权重不随各因素的状态变化的缺陷,在常权和变权模型下各自叠加复合主控因素专题图,并对比分区的变化,得出变权模型下的底板突水脆弱性评价,提高了煤层底板突水脆弱性评价的准确性,对煤炭的安全开采具有一定的指导性。

Through the application of GIS technology and the vulnerability index method, a thematic map of the main controlling factors has been established under the three levels of confined aquifer, geological structure and floor aquifer. The analytic hierarchy process was used to determine the weight of the common model. By using the method of zonal variable weighting, the weight of each master factor is adjusted to obtain a reasonable combination, which improves the defect that the weight does not change with the state of each factor under the normal model. Based on the common theme and the variable weight model, thematic maps of the composite master control factors were superimposed on each other, and the changes of zoning are compared. It is concluded that the evaluation of floor water inrush vulnerability under changing weight model can improve the accuracy of evaluation of water inrush vulnerability of coal floor and has some guidance to the safe mining of coal.