王家沟煤矿条带充填开采导水裂隙发育规律研究

Research on Law of Water Flowing Fracture Development Due to Strip-filling Mining in Wangjiagou Coal Mine

为探索陕北榆神矿区王家沟煤矿萨拉乌苏组含水层下保水开采方法,在分析该矿1301、1302综采工作面地质采矿条件的基础上,基于充填条带与关键层协调作用原理,分别采用物理相似模拟实验和FLAC3D数值模拟计算方法,对比研究了综采一次采全高全部垮落法和条带充填两种开采方法开采后覆岩导水裂隙的发育规律。试验模拟结果表明,1301全部垮落法开采导水裂缝带最大高度达110.4m,1302条带充填开采导水裂缝带最大高度约55.4m;覆岩导水裂隙随直接顶、基本顶的初次来压和周期来压以及覆岩主关键层的破断失稳呈间歇性变速向上发育,应用条带充填可以起到支撑关键层的协调控制作用,能够有效控制覆岩导水裂隙带的发育高度,实现王家沟煤矿含水层下保水采煤的目的。

To explore the water preserved mining method for Wangjiagou Coal Mine of Yushen mining area under Salawusu Formation Aquifer in Northern Shaanxi, taking the geological and mining conditions of the 1301 and 1302 fully - mechanized face as background, based on the principle of interaction between filling strip and key stratum, using both similar and numerical simulation, a comparative research on law of water flowing fracture development respectively resulting from caving method and strip - filling method was conducted. The results show that, the maximum height of water flowing fractured zone of caving face 1301 is about 110. 4m, while that of strip -filling face 1302 is about 55.4m. With the periodic failure and instability of immediate roof and main roof as well as the key stratum, water flowing fracture intermittently develops upward at varying velocity. The filling strips support the key stratum and coordinate to its flexural subsidence, effectively control the height of water flowing fractured zone, realizing water preserved mining under aquifer of Wangjiagou Coal Mine.