水库坝体下厚煤层放顶煤协调开采技术

Coordinated Top Coal Caving Mining Technology of Thick Seam Under Reservoir Dam

为解放水库坝体下压煤,提高煤炭资源采出率,采用理论分析、模拟计算和现场观测等方法,提出水库坝体下厚煤层放顶煤协调开采技术。首先考虑工作面推进方向、开采尺寸、位置、开采顺序和推进速度等5个因素,提出了水库坝体下厚煤层放顶煤五因素协调开采模型;在此基础上,分析计算了厚煤层放顶煤开采的两带高度、放顶煤协调开采后水库坝体的移动和变形值,研究了水库下放顶煤开采的安全性和坝体采动影响程度;并在水库坝体上建立地表移动观测站,对堤坝进行动态监测。研究结果表明:五因素协调开采模型应用于水库坝体下采煤是可行的,实现了水库坝体下厚煤层放顶煤安全开采,水库坝体未出现拉伸变形裂缝。

In order to liberate coal under reservoir dam and to improve the mining rate of the coal resources, with the theoretical analysis, simulated calculation, site observation and other method, a top coal caving coordinated mining technology of the thick seam under the reser- voir dam was provided. Five factors of the coal mining face forward direction, mining size, location, mining sequence and pushing forward speed were firstly considered and a model of the top coal coordinated mining with the five factors in the thick seam under the reservoir dam was provided.Based on the circumstances ,the paper analyzed and calculated the two zone heights of the top coal mining in the thick seam and the displacement and deformation value of the reservoir dam after the top coal coordinated mining conducted.The paper studied the safety of the top coal mining under reservoir dam and the mining influence degree to the dam. A surface ground displacement observation station was established on the reservoir dam to have a dynamic monitoring and measuring of the reservoir dam.The study results showed that the coordinated mining model with the five factors applied to the coal mining under reservoir dam was feasible.The top coal safety mining in the thick seam under reservoir dam was realized and no tensile deformation crack occurred in the reservoir dam.