深凹露天转地下采场巷道围岩监测及稳定性分析  

Monitoring and Stability Analysis on Roadway Surrounding Rock in Deep Stope During Transition from Open-pit to Underground Mining

作　　者：李航空 李正胜[2] 

机构地区：[1]中铁资源集团有限公司,北京100039 [2]煤炭工业规划设计研究院有限责任公司,北京100120

出　　处：《矿业研究与开发》2017年第4期42-45,共4页Mining Research and Development

基　　金：国家"十一五"科技计划资助项目(2006BAB02A17)

摘　　要：通过现场监测和数值分析相结合的方法,从位移和应力角度对杏山铁矿露天转地下开采过程中的露天边坡和井工巷道的围岩稳定性问题进行研究,分析了采场巷道围岩的位移、应力变化规律,揭示了露天转地下开采过程中围岩体所受复合采动扰动的力学机理,结论如下:巷道两帮和顶板围岩位移增长率均呈现出典型"S"形趋势,即"加速变形期-急速变形期-平缓期",最大复合采动应力大约距工作面40m左右,采场扰动和巷道掘进扰动的应力叠加,成为巷道变形破坏的主要原因;地下开采过程中,覆盖层下沉,巷道顶板应力由垂直转向侧向挤压,随着开采深度的增加,覆盖层下移距离增大,坡脚拉应力和巷道应力集中区域增大,导致露天转地下开采过程中围岩体发生破坏失稳。The stability of slope and surrounding rock of open-pit underground roadway in Xingshan iron ore was studied from the displacement and stress based on the methods of field monitoring and numerical analysis. The displacement and stress variation law were analyzed, and the mechanical mechanism of the surrounding rock under compound mining disturbance during transition from open-pit to underground mining was revealed. The conclusions were obtained as follows. The displacement growth rate of the surrounding rock in two sides of roadway and roof both showed accelerated deformatlon-rapid deformation- slow growth period, that was the ＂S＂ trend; the maximum compound mining stress was about 40 meters from the working face, and the stress superposition between the mining field and the roadway excavation disturbance became the main cause of the deformation failure of the roadway; in the process of underground mining, the stress of roadway roof transferred from ver- tical extrusionto lateral extrusion with the cover sinking; with the increase of mining depth, the down distance of the cover, the tensile stressat the bottom of slope, as well as the stress concentration area in roadway all increased, which resulted in the in- stability and failure of surrounding rock during the transition from open-pit to underground mining.

关 键 词：露天转地下 位移 应力 复合采动效应 

分 类 号：TD322.4[矿业工程—矿井建设]