马城矿急倾斜厚矿体上向开采围岩应力演化规律

Stress Evolution Law of Surrounding Rock in Upward Mining of Steep Inclined Thick Ore Body

马城矿采用分层充填法进行上向开采,为研究其围岩应力演化规律,以马城矿1、3、5号矿体充填开采实例为研究对象。通过数值模拟分析,对比在单一采区上向开采和上下两采区同时开采的不同工况下,对其围岩水平和垂直应力场的变化规律进行研究。结果显示,上下两采区同时开采的应力场变化不是单一采区上向开采的应力之和,由于矿体属急倾斜矿体,单一采区开采时的部分区域应力值在开采过程中会高于上下两采区同时开采时的应力值。

Taking the example of filling and mining of No.1,No.3 and No.5 ore bodies in Macheng Mine as the research object,through numerical simulation analysis,compare the surrounding rock level under different working conditions in the single mining area and the mining in the upper and lower mining areas.And the variation law of vertical stress field is studied.The results show that the stress field change of the simultaneous mining in the upper and lower mining areas is not the sum of the stresses of the upper mining area.Because the ore body is a steeply inclined ore body,the stress value of some areas during the mining of a single mining area will be high during the mining process.The stress value at the time of simultaneous mining in the upper and lower mining areas.