基于组合赋权法的煤层顶板突水危险性评价

传统的富水性评价中往往采用单一的赋权方法,为准确评价煤层顶板直接充水含水层的突水危险性,提出了一种组合赋权法.首先,在充分分析矿井水文地质资料的基础上,选取岩芯采取率、渗透系数、含水层厚度、脆塑性岩厚度比、砂泥岩互层特征作为富水性评价指标,通过拉格朗日乘子法将层次分析法与熵权法得到的各评价指标权重进行优化组合,得到其组...

Evaluation of the risk of water inrush from coal roof based on combination weighting method

In order to accurately evaluate the water inrush risk of aquifer directly filled with water in coal seam roof, a combination weighting method is proposed in this paper. Firstly, on the basis of the full analysis of mine hydrogeological data, the core take rate, permeability coefficient, aquifer thickness, brittle plastic rock thickness ratio, sand-mudstone interbedding characteristics are selected as water-rich evaluation indexes. The weight of each evaluation index obtained by analytic hierarchy Process and entropy weight method is optimized and combined by Lagrange multiplier method. The combined weight was introduced into the water abundance index method to construct the water abundance evaluation model based on the combined weight method. Then, the development height of water-conducting fracture zone is determined comprehensively by analogy method and similar material simulation method. Finally, with the help of ArcGIS platform, the water inrush risk of coal seam roof in the study area is divided into danger zone, transition zone and safety zone. The results show that most of the study area is danger area, and the transition area and safety area are small. According to the zoning diagram of water inrush risk of coal seam roof, the overall water control principle of "risk reduction, supervision, mining and safety" is put forward, which provides a new idea for water hazard prevention and control of aquifer directly filled with water in coal seam roof in the future.