山坡地形下崩落采矿法开采引起大范围地表开裂的数值分析

The numerical analysis of large-scale surface fracture resulted from caving mining in the slope terrain

针对程潮铁矿东主井工业场地开裂严重、产生的崩落角很小 ,并造成东主井严重开裂的现象 ,进行了有限元分析计算。计算考虑了地表地形的复杂情况。结果表明 ,崩落角过小与地表形状有关 ,由于崩落区的形成 ,坡脚失去支撑 ,使位于山坡地上的井筒局部处于拉应力状态 ,并使井筒拉裂。

Resulted from small caving angle produced in practising caving mining in Chenchao Iron Mine,the surface of east main shaft fractured severely,so the finite element analysis was made.It showed from analyzed result that the small caving angle was related to complicated terrain. With the forming of caving area,the slope foot was rid of support and a part of the shaft on the slope land was in the state of tensive stress,resulting in shaft cracking.The result of finite element analysis has provided theoretical basis of shaft conservation.