综放开采条件下煤层顶板涌(突)水危险性评价

(突)水危险性评价] 孙 魁1,2,夏玉成1,李 成1,2,陈建平2,方 刚3 (1.西安科技大学 地质与环境学院,陕西 西安 710054; 2.陕西省地质环境监测总站 矿山地质灾害成灾机理与防控重点实验室,陕西 西安 710054; 3.中国煤炭科工集团 西安研究院有限公司,陕西 西安 710054)

地质资源与地质工程; 顶板水害; 叠加分析; GI-变异系数法; 突水危险性评价

Risk assessment of water inflow(inrush)from coal seam roof under fully mechanized caving mining
SUN Kui1,2,XIA Yu-cheng1,LI Cheng1,2,CHEN Jian-ping2,FANG Gang3

(1.College of Geology and Environment,Xi'an University of Science and Technology,Xi'an 710054,China;2.Key Laboratory of Mine Geological Hazard Mechanism and Control,Shaanxi Institute of Geo-Environment Monitoring,Xi'an 710054,China; 3.Xi'an Research Institute,China Coal Technology Engineering Group,Xi'an 710054,China)

geological resources and geological engineering; roof water hazard; superposition analysis; GI-variation coefficient method; risk assessment of water inrush

DOI: 10.13800/j.cnki.xakjdxxb.2019.0310

备注

为评价综放开采条件下煤层顶板涌(突)水危险性,以焦坪矿区某井田为例,通过水质分析和导水裂隙带发育高度分析相结合的方法,对矿井顶板涌(突)水水源进行了判定,同时在基于GI-变异系数法的含水层富水性分析,基于砂泥岩分布图的离层发育危险性分析和基于裂采比的冒裂安全性分析的基础上,通过叠加分析对顶板涌(突)水危险性进行了评价。结果 表明:矿井顶板涌(突)水水源为白垩系下统洛河组下段砂岩裂隙潜水含水层水,以及发育在宜君组粗砾岩与直罗组顶部泥岩之间离层空间内的离层水。顶板涌(突)水危险的区域主要分布在井田中部和西部,其中中部的一、二盘区由于煤层采厚较大,导水裂隙带突破洛河组底界的范围较广,顶板涌(突)水危险性最大,且存在局部离层强突水区; 井田西部三、四盘区主要为顶板涌(突)水中等危险区; 井田东北部五盘区,大部分区域为相对安全区,局部存在含水层突水中等危险区。

In order to evaluate the risk assessment of water inflow(inrush)from coal seam roof under fully mechanized caving mining, a mine field in Shaanxi Jiaoping mining area was taken as an example,the water source of the mine roof surge is determined by the method of water quality analysis and the development height analysis of the water conducting fracture zone.At the same time, on the basis of the water rich analysis based on the GI-variation coefficient method risk analysis of the separation development based on the sand shale distribution map,and safety analysis of fissure mining ratio,the risk of roof water inrush is evaluated by superposition analysis.The results indicate that the water source of the mine roof is the water in the lower section of the lower Cretaceous Luohe formation sandstone fissure dive aquifer,and the separated layer water developed in the separation space between the coarse conglomerate and the mudstone of the diojun group.The area of the roof inflow(inrush)water is mainly distributed in the middle and west of the well field.In the first and second panel of the middle part,the coal seam has a great thickness,and the water guide belt breaks through the wide range of the bottom of the Luohe group,so the risk of water inflow(inrush)from coal seam roof is the biggest.In addition,there is a local strong outburst area of abscission layer of water.The third or fourth panel of the west part is mainly dangerous areas.Most of the fifth panel in the northeast part of the mine area are relative safety areas,and the other is the middle dangerous area of abscission layer of water inrush.