综放工作面回风巷底鼓机理与治理技术

Mechanism and Control Technology of Floor Heave at Return Airway at Fully Mechanized Caving Face

为了有效解决常村矿回采巷道底鼓问题,通过分析巷道围岩变形机理及破坏特征,提出了钻孔卸压和钻孔卸压+混凝土反拱+底板锚杆联合支护2种优化方案。现采用FLAC3D软件进行数值模拟,并分析比较了模拟塑性区、位移场的变化情况,对2种优化方案的支护效果进行验证。现场实测数据表明:在采用钻孔卸压+混凝土反拱+底板锚杆联合支护方案后,最大底鼓量为146 mm,仅为原有最大底鼓量的23%,因此达到了控制围岩变形和治理巷道底鼓的效果。

In order to effectively solve the problem about floor heave of rectangular roadway in changcun Coal Mine, by analyzing the deformation mechanism and failure characteristics of surrounding rock of roadway, we propose two schemes including drillhole pressure relief and drillhole pressure relief ＋ inverted arch of the concrete ＋ floor anchor. In this article, the change of plastic area and dis- placement field on two supporting schemes were compared by FLAC3D numerical simulation. By comparing the pristine roadway deform- ation, the maximum floor heave amount is 146 mm which is only 23% of the original roadway deformation amount by using the scheme of drillhole pressure relief ＋ inverted arch of the concrete ＋ floor anchor. So, combined supporting method can control deformation of roadway and floor heave effectively.