高级检索

近距离煤层顶板水害立体防控技术研究———以蒙陕深部矿井为例

Study on stereoscopic prevention and control technology of roof water disaster in contiguous coal seam in deep mines of Inner Mongolia and Shaanxi

  • 摘要: 蒙陕地区深部侏罗系煤层开采水文地质条件复杂,矿井在开采期间面临顶板疏水难度大、排水系统压力大、掘进效率低、经济效益差等难题,提出“低位邻面截流、分区防控、层组治理”的水害防控思路,建立近距离煤层顶板水害立体防控方案和以单孔涌水量、钻孔水压力、静储量为指标的水害立体防控效果评价体系。以呼吉尔特矿区门克庆矿井3-1,2-2中煤近距离开采顶板水害防治为例,通过井上下钻探、物探立体探查手段,开展精细探查,建立和完善了井上、井下水文监测系统,在分析研究矿井顶板含隔水层沉积地质展布情况、富水异常区分布范围及层段和地下水流场特征等重要水文地质参数的基础上,实行上行开采的方式,首先有针对性的开展了3-1煤3101工作面的顶板疏放水工作,并通过疏放水试验精细预测工作面涌水量,建立完善可靠的排水系统,该工作面顶板疏放水钻孔累计疏放水量达2 659.3万m3。在2201工作面掘进期间,通过超前探放水钻孔发现,相较于3-1煤,其顶板含水层水压、水量均有不同程度的下降,说明先行开采下层3-1煤截流、降低了2-2中煤顶板含水层富水性,水害防治方案达到了初步效果。2201工作面在回采前,结合沉积地质分析情况及物探异常区圈定范围,开展重点区域和层段顶板水疏放工作,进一步优化顶板疏放水钻孔设计,根据各孔终孔水量、水压情况,2-2中煤顶板含水层富水性有了明显的下降,这都表明提出的以区域和煤组为单位大范围治理顶板水害的方法,形成的蒙陕地区深部矿井近距离煤层顶板水害立体防控技术,有利于近距离煤层顶板水害防治。

     

    Abstract: In view of the complex hydrogeological conditions of the deep Jurassic coal seam mining in Ineer Mongolia-Shaanxi area, the mine is faced with problems such as difficult drainage of roof, high pressure of drainage system, low excavation efficiency and poor economic benefits during the mining. The water hazard prevention and control idea of “low-position adjacent face interception, prevention and control by zones, management by layers and groups” was put forward. The three-dimensional prevention and control scheme of roof water hazard in close distance coal seam and the evaluation system of three-dimensional prevention and control effect based on water inflow of single hole, water pressure of borehole and static reserve were established. Taking the short-distance mining roof water hazard prevention in Menkeqing Mines 3-1 and 2-2 of the Hujierte Mining Area as an example,fine exploration was carried out by means of up-down drilling and geophysical prospecting, etc., and the up-down well hydrological monitoring system was established and improved. On the basis of analyzing and studying important hydrogeological parameters such as the geological distribution of the aquifer-containing layer on the roof of the mine, the distribution range of anomalous water-rich areas, and the characteristics of the interval and groundwater flow field, the upward mining method was implemented. First, the roof drainage of the 3-1 coal of 3101 working face was carried out in a targeted manner, and the water inflow of the working face was accurately predicted through the drainage test, and a complete and reliable drainage system was established. The cumulative drainage volume of water drainage boreholes reached 26.59 million m?. During the excavation of 2201 working face, it was discovered through advanced water-discharging drill holes that,the water pressure and water quantity of the roof aquifer decreased to varying degrees compared with that of coal 3-1, indicating that the water content of the roof aquifer of coal 2-2 was reduced by cutting off the flow of coal 3-1 in the lower layer in advance, and the water damage prevention scheme has achieved preliminary effects. Before mining at the 2201 working face, combined with the sedimentary geological analysis and the delineated range of geophysical anomaly areas, the drainage work of roof water in key areas and layers was carried out to further optimize the design of drilling holes for roof water drainage. According to the water quantity and water pressure of each final hole, the water richness of coal roof aquifer in 2-2 decreased significantly. All these indicate that the proposed method of controlling roof water damage on a large scale by region and coal group, formed a three-dimensional prevention and control technology for roof water damage in deep coal mines in Inner Mongolia and Shaanxi, which is beneficial to the prevention and control of roof water damage in close range coal seams.

     

/

返回文章
返回