急倾斜煤层采空区结构特征GPR探测

急倾斜煤岩体结构和地质缺陷具有隐蔽性。历史性无序开采形成的采空区分布的不规则性严重影响安全开采。以神新小红沟煤矿急倾斜煤层开采区域空区分布规律预测与参数确定为目标。通过理论分析、GPR地面与地下立体联合探测,分析了+522水平B3和B6开采扰动范围内采空区结构特征。+522水平距五一煤矿巷道垂直距离约为35.0～35.5 m.B3巷1 214～1 232m范围内空区覆岩破坏严重,多处出现破碎区。空区下部近似椭圆,上部似半椭球体结构,且空区已联通。1 232～1 250 m范围空区及覆岩破坏严重,局部区域积水量大,为现场开采设计与灾害防治提供科学依据。

Structure characteristics of mined-out area in steep coal seams based on GPR detection

Structure and geology of rock masses in steep coal seams has the character of concealment. The irregular distribution of goal formed by the historically disordered mining seriously affected the safety of mining. The prediction and parameter identification of goaf distribution regularity in XiaoHongGou coal mine mining steep coal seam was the target. Through theoretical analysis and GPR ground and un- derground three-dimensional joint detection, the structure characteristics of goaf within the mining disturbance zone caused by the mining in ＋ 522 level B3 and B6 coal seams were analysed. The vertical distance between ＋ 522 level and WuYi coal mine was about 35.0 - 35.5 m. The overburden above the gob within the scope of B3 Lane 1 214 - 1 232 m was broken severely, broken zones existed in multiple places. The lower part of the goaf was approximate ellipse, the upper part like semielliptical sphere structure, and the empty zones had been closed. The destruction of goaf and overlying strata between the range of 1232 m and 1250 m was serious, and water amount was large at some location.