西石门铁矿北区缓倾斜矿体地压成因及其控制

Formation and Control Technology of Ground Pressure of Gently Inclined Orebody in North Mining Area of Xishimen Iron Mine

为了制定西石门铁矿北区缓倾斜矿体开采时的地压控制措施,首先根据现场调查总结了地压活动规律:地压主要表现为巷道两帮破碎、拱腿收敛呈"Ω"形,发生在采空区上盘侧约35 m的范围内,严重程度随至空区上盘距离的增加而减弱.上述规律与模拟得出的楔形体地压作用规律吻合,揭示出地压主要由采空区上盘楔形体作用引起.因此研究了地压控制措施:处于楔形体地压作用下的矿体开采时,开采顺序以从空区边界向上盘退采为宜,进路垂直矿体走向布置更佳,以拱架支护为主并对两帮加强支护可有效控制变形.

In order to formulate the ground pressure control measures for gently inclined orebody mining in north mining area of Xishimen Iron Mine,the ground pressure activity characteristic is summarized according to the field investigation.The ground pressure behavior of two sidewalls crashing and arch leg bending occurrs mainly around 35 m in the hanging side of the mined-out area.The severity of ground pressure behavior decreases gradually with the increase of distance away from the upper goaf.The ground pressure behavior is consistent with the simulated ground pressure of the wedge body,which reveals that the ground pressure is caused mainly by the action of wedge body in the hanging side.The control measures are as follows:for ore body mining under the action of wedge pressure,the most suitable mining sequence is from the boundary of the mined-out area to the hanging side;the roadway should be perpendicular to ore body strike;arch supports with auxiliary sidewalls supports can control deformation effectively.