复杂开采环境下采场位移失稳过程研究

Study on the Stope Displacement Unstability Process Under Complex Mining Environment

针对复杂开采环境下采场发生大规模竖直位移从而引起失稳垮塌的问题,结合某地下大型铅锌矿山-320 m中段主矿体失稳垮塌的工程实际,运用三维计算机数值程序3DEC对采场及周边充填体竖直位移程度、影响范围和最大剪应力分布规律进行了分析,为隐患资源安全高效回收及确定合理的充填工艺和采矿方法提供了重要依据。结果表明:0~#采空区上方的矿体整体发生了下沉,下沉最大位移达到2 m;发生最大剪应变增量的区域主要位于0~#采场中下部,并最终形成了一条U形最大剪应变增量贯通带;0~#采场采空区垮塌后导致0~#采场上部矿体、N0-1~#、N1-2~#、S0-1~#付以及S0-1~#付-1采场位于垮塌区滑移面之上,而N2-3~#和S1-2~#采场位于垮塌面边沿,从而将其确定为垮塌区的影响范围。

Mass vertical displacement collapsed in environment of complex mining stope always cause instability problems.By combining with the engineering practice of collapse in -320 m midway through the main orebody buckling in certain large lead and zinc underground mines, the three dimensional computer numerical program 3DEC was used to analyze the vertical displacement of stope filling body and around the degree, influence range and maximum shear stress distribution.It provides an important basis for the safe and efficient recovery of hidden resources and the determination of reasonable filling technology and mining methods.The results show that 0# ore body above the mined-out area overall sinking, the maximal sinking displacement is up to 2 m.The maximum shear strain increment region is mainly located in 0 # stope part, and eventually formed a U-shaped maximum shear strain increment through belt.The 0# stope collapse caused upper 0# stope ore body, mined-out area of N0-1#, N1-2#,S0-1# FU and S0-1# FU-1 located in the area above the slip surface,and N2-3# and S1-2# stope in the collapse edge.It is determined as the influence area of the collapse area.