Similar Physical Modeling of Roof Stress and Subsidence in Room and Pillar Mining of a Gently Inclined Medium-Thick Phosphate Rock
Similar Physical Modeling of Roof Stress and Subsidence in Room and Pillar Mining of a Gently Inclined Medium-Thick Phosphate Rock
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DOI：
10.1155/2021/6686981
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发表时间：
2021-04
影响因子：
1.8
通讯作者：
Xiaoshuang Li;Zhifang Liu;Shun Yang
中科院分区：
文献类型：
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作者：
Xiaoshuang Li;Zhifang Liu;Shun Yang
缓倾斜中厚矿体通常被认为是最难开采的矿体类型，使用当前可用的策略（即，房柱法（Room and Pillar Method）。采用相似物理模型研究了云南晋宁磷矿缓倾斜中厚磷矿开采过程中的顶板应力和沉陷规律。分别考虑了3 m、5 m和8 m矿柱采场结构的围岩应力场、位移场和顶板破坏演化特征。结果表明，停采后，三种采场结构上方均形成明显的卸压区，顶板前部形成承压区。随着工作面开采范围的扩大，应力释放边界逐渐增大，顶板顶部有下沉趋势，最大下沉量分别为-14.58 mm、-4.67 mm、-3.48 mm。
Gently inclined medium-thick orebodies are generally recognized as the most difficult type of orebody to mine, using current available strategies (i.e., the room and pillar method). In the present study, a similar physical model was used to investigate the roof stress and subsidence for mining gently inclined medium-thick phosphate rock from the Jinning Phosphate Mine, Yunnan Province, China. The stress field, displacement field, and roof failure evolution characteristics of the surrounding rock with stope structures of 3 m, 5 m, or 8 m ore pillars were considered. The results showed that, after mining stopped, obvious pressure relief areas formed above the three stope structures, and pressure-bearing areas formed at the front of the roof. With extending the mining in the working face, the stress relief boundary also gradually increased, and the top of the roof tended to sink with a maximum subsidence of –14.58 mm, –4.67 mm, and –3.48 mm. Due to the mining activity, the overlying strata bent and subsided from top to bottom, creating bending subsidence, fracture, and caving zones.