基于围岩应力测量的矿块结构参数优化

曹家洼金矿Ⅱ号矿体307、308采场顶板曾发生垮塌,为了掌握该矿体开采过程中的围岩应力及地压显现特点,采用应力解除法并辅以顶板下沉观测和矿柱外形观察的方式,结果表明采场长度达35m时,开始出现拉应力,并随长度的增加而增大;采场高度超过20m之后采场压力逐渐增长;顶板下沉量随采场跨度增大而增加,最大下沉量为8mm。开展采场围岩应力测量,其结果用以指导矿块设计和采场顶板控制收到了良好的安全、经济效果。

Ore Block Structural Parameters Optimization Based on the Wall Rock Stress Measurement

The stope 307 and 308 of No. 2 ore body in Caojiawa Gold Mine once had a roof collapse. In order to master the characteristics of the wall rock stress and earth pressure, the stope wall rock stress measurement was implemented with the stress relieving method supplemented by the roof settlement observation and the jamb appearance observation. The results are as follows： when the stope length is up to 35m, the tensile stress began to appear, and it increases with the length; when the stope height is more than 20m, the stope pressure gradually increases and the roof sinking amount increases with the stope span, and the maximum subsidence amount is 8mm. It gives guidance about the ore block design and the stope roof control, and put a good influence on safety and economy.