薄基岩浅埋旺采工作面覆岩运移特征研究

Study on Overburden Strata Migration Features of Wongawilli Mining Face Under Thin Base Rock with Shallow Depth

为了掌握薄基岩浅埋旺格维利法回采工作面覆岩运移特征,以神东公司榆家梁煤矿42216旺采工作面为研究对象,通过理论计算和现场监测等技术手段,得到适合神东矿区自身特点的线性支架压力监测、顶板下沉和片帮观测及地表移动监测方案,提出薄基岩浅埋旺采工作面的极限悬顶面积的计算方法。结果表明,旺采工作面在开始回采时,顶板压力显现不明显,随着悬顶面积的增大,顶板压力极不稳定,压力时大时小,当直接顶经强制放顶或自然垮落后,顶板压力逐渐趋于稳定,随着短壁工作面向前推进,顶板压力呈现周期性特点;旺采工作面地表塌陷具有突然性、台阶状的特点。

In order to master the overburden strata migration features of the Wongawilli mining face under thin base rock with shallow depth, taking No. 42216 Wongawilli mining face in Yujialiang Mine of Shendong Company as the study object, with the theoretical calculation, the site monitoring and measuring and other technical means, a linear pressure monitoring and measuring of the powered support, roof subsidence, coal wall spalling observation and the surface ground displacement monitoring and measuring plan suitable for the mine features in Shendong Mining Area were obtained. The paper provided the calculation method of the limit suspended roof area in the Wongawilli mining face in a shallow depth seam under the thin base rock. The results showed that at the initial miming of the Wongawilli mining face, the roof pressure behavior was not obvious. With the suspended roof area increased, the roof pressure was extremely unstable and the roof pressure would be high and low. When the immediate roof was forced caved or naturally fallen down, the roof pressure would be steadily in stable. With the sbortwall mining face advanced forward, the roof pressure would have periodical features. The surface ground subsidence above the Wongawilli mining face would have the features of the suddenness and benches.