煤层覆岩“两带”高度探测方法对比

Comparison of Height Detection Methods of“Two Zones”of Overburden Rock in Coal Seam

煤层开采过程中,顶板覆岩发生垮落、破坏,围岩地应力重新分布过程中会造成顶板覆岩采动裂隙发育,形成人为垮落带和导水裂隙带。“两带”高度对于煤层开采影响较大,影响矿井顶板涌水、地面沉降以及顶板支护等矿井工作。以内蒙古某煤矿501工作面“两带”探测工程实例为背景,通过消耗量观测、声波测井、井下窥视,以及理论计算和数值模拟等多种方法,得出各方法所探测的“两带”高度结果,并通过对各探测方法的分析对比,进一步研究不同方法探测结果的可靠性及其影响因素,确定了各方法在应用于“两带”高度探测工程实际中的优劣性,为煤矿在获取“两带”高度方面提供探测方法参考。

In the process of coal mining,roof overburden caved and failed,and mining-induced fractures develop in the roof overburden during the redistribution of surrounding rock stress,forming artificial caving zone and water-conducting fracture zone.The height of“two zones”has great influence on coal seam mining,which affects the mine roof water gushing,land subsidence and roof support.Based on the“two zones”detection project of 501 working face of a coal mine in Inner Mongolia,the height results of“two zones”detected by various methods were obtained including consumption observation,acoustic logging,downhole peep,theoretical calculation and numerical simulation.The reliability of the detection results by different methods and their influence factors were further studied.The advantages and disadvantages of each method in the practical application of“two zones”height detection engineering were determined,which provide a reference for the coal mine in“two zones”height detection method determination.