软弱覆岩综放开采导水裂缝带高度探析

Study on height of hydraulic fracture zone in fully-mechanized top-coal caving mining with soft overburden

为准确获得覆岩软弱、煤层厚度变化明显、综放开采条件下采场的导水裂缝带高度,以新登煤矿31101工作面为例,采用理论计算、相似模拟、现场注水漏失量检测等多种方法对比研究导水裂隙带高度。结果表明,在该工程背景下,不同方法所得结果差异较大,为保证生产安全,拟合在不同条件和方法下得到的最大“两带”高度,得出适应该矿井的计算模型,该模型能够与已有的研究成果相互印证,计算结果可靠。研究认为,为了进一步精确计算“两带”高度,至少要采用一种现场实测方法,并需要结合多种方法对比研究,以获得适用的经验公式或拟合出新的公式,此次研究成果针对复杂的地质条件,具有更强的适用性。

In order to accurately obtain the height of water conducting fracture zone in the stope under the conditions of weak overburden,obvious change of coal seam thickness and fully-mechanized top coal caving mining,taking 31101 working face of Xindeng Coal Mine as an example,the height of water conducting fracture zone is compared and studied by various methods such as theoretical calculation,similarity simulation and on-site water injection leakage detection.The results show that under the background of the project,the results obtained by different methods are quite different.In order to ensure production safety,fit the maximum height of the"two zones"obtained under different conditions and methods,and obtain the calculation model suitable for the mine.The model can be mutually confirmed with the existing research results,and the calculation results are reliable.It is considered that in order to further accurately measure the height of the"two zones",at least one field measurement method should be adopted,and a comparative study of multiple methods should be combined to obtain applicable empirical formulas or fit new formulas.The research results have stronger applicability for complex geological conditions.