空场嗣后充填法充填体对围岩移动控制作用时空规律研究  

Space-time rule of the control action of filling body for the movement of surrounding rock in method of the delayed filling open stoping

作　　者：于世波[1] 杨小聪[1] 董凯程[1] 解联库[1] 孙晓明[2] 郭利杰[1] 

机构地区：[1]北京矿冶研究总院矿山工程研究所,北京100160 [2]中国矿业大学(北京)深部岩土力学与地下工程国家重点实验室,北京100083

出　　处：《采矿与安全工程学报》2014年第3期430-434,共5页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(510004014);国家"十二五"科技支撑计划项目(2012BAB01B01;2013BAB02B02)

摘　　要：以某铁矿-230^-290 m首采中段工程为研究对象,采用现场多点位移计监测及数值模拟相结合的方法,针对大直径深孔阶段空场嗣后充填法充填体对采场围岩移动控制作用的时空规律进行了研究,建立了上覆岩层移动控制的支承压力三维力学结构模型。研究结果表明,15 m宽度的采场结构只要在延滞期内及时充填,围岩的移动变形能够得到有效控制。矿体下盘成为支承上覆岩层的主要承载结构,胶结充填体支承上覆岩层的能力有限,但能够有效限制上覆岩层的移动变形,矿房和矿柱采场围岩最终变形量无差异性,覆岩最大下沉量39 mm,地压显现不明显。Selecting the first mining project at the-230-290 m middle section of an iron mine as the research object, the space-time rule of filling body for controlling the movement of stope surrounding rock in the large-diameter long-hole with the delayed filling open stoping method has been studied in methods of field monitoring of multipoint displacement extensometers and numerical simulation. The three-dimensional mechanical structure model of abutment pressure for the movement control of over-lying rock mass has been established in this paper. The results indicate that the movement and defor-mation of surrounding rock could be effectively controlled as long as the stope of 15-meter width has been filled within the demurrage time. The footwall becomes the main bearing structure to support overlying rock mass. The capacity of the cement filling body is limited to support overlying rock mass while it is a valid constriction of the movement and deformation of overlying rock mass. The maximum deformation of overlying rock mass is 39 mm and there is almost no difference between the ultimate deformations of surrounding rock at the room and pillar. So the ground pressure is not obvious.

关 键 词：充填体 围岩移动变形 支承压力拱 时空规律 数值模拟 

分 类 号：TD353[矿业工程—矿井建设]