薄基岩厚松散含水层下综放开采安全性研究

为研究薄基岩厚松散层含水层下综放开采的安全性,通过对赵家寨煤矿12采区东翼松散层地质特征分析,将其分为"一隔三含",并揭露其厚度和结构分布特征对煤炭开采的影响。采用经验公式计算不同采高下导水裂隙带高度,并建立UDEC数值模型模拟分析开采过程中上覆岩层变形破坏规律。基于导水裂隙带高度经验公式计算、数值模拟结果和相关实测资料,并结合12采区东翼的地质特征,引入"导水裂隙带高度调整系数n"概念,提出并验证该区域的导水裂隙带高度计算公式。结果表明,12采区东翼大部分区域可疏干新近系下部含水层后开采,研究内容可减小防水煤岩柱高度,提高煤炭采出率。

On the fully mechanized cave-in mining safety under the condition of the thin overlain bedrock by the thick alluvium

The paper is inclined to present the results and the methods for analyzing the geological features of the alluviums in the eastern No.12 mining area of Zhaojiazhai Coal Mine,in hoping to heighten the fully mechanized caving mining safety under the thin bedrock overlain by the thick alluvium.In our paper,we have divided the alluviums into "One-aquifer and Three-aquifuges",which helps us to disclose the impacts of the thickness of the aquifers (aquifuges) and the distribution features of the structure on the coal mining activities.In the process of our investigation,we have calculated and worked out the height of the water-releasing orientation and zones via an empirical formula.At the same time,a UDEC numerical model has been adopted to analyze the deformation and the damage status-in-situ of the overlain rock while in the mining activities are being done.On the basis of the calculation results,we have done further numerical simulation and the statistical accounting under the similar geological condi tions and the related geological feature analysis of the aforementioned mining area,which helps us to bring about the concept of "height adjustment coefficient of the water-conducting fractured zone" to improve the empirical formula so as for the results of the calculation to be made closer and more accurate to the measured results of the mining area.And,finally,we have efforts to deter mine and confirm the safety of the full mechanized cave mining exploitation in the mine.The results of the above said investiga tion and exploration demonstrate that it wouldn' t be possible for the mining area to be mechanically mined directly,for the aquifer of lower neogene should be drained in the most of the area while the mining activities are being done.Thus,it can be seen that the study results of the paper can help to reduce the height of the coal pillars in the area and heighten the mining productivity,which is in a position to provide a theoretical foundation for min ing safely in the area and the similar cases in other mines,with a method for safety mining analysis.