| 姑山铁矿露天转地下开采境界顶柱合理厚度研究 |
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| 引用本文： | 龙周彪,韩立军,孟庆彬,李兴权,刘晓帅,陶陆.姑山铁矿露天转地下开采境界顶柱合理厚度研究[J].矿冶工程,2019,39(2):24-29. |
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| 作者姓名： | 龙周彪 韩立军 孟庆彬 李兴权 刘晓帅 陶陆 |
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| 作者单位： | 中国矿业大学 深部岩土力学与地下工程国家重点实验室,江苏 徐州221116;中国矿业大学 力学与土木工程学院,江苏 徐州221116;中国矿业大学 深部岩土力学与地下工程国家重点实验室,江苏 徐州,221116 |
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| 基金项目： | 国家自然科学基金(51574223, 51704280);
中国博士后科学基金(2017T100420, 2015M580493) |
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| 摘 要： | 以姑山铁矿为工程背景, 针对采用进路充填采矿法的露天转地下开采矿山, 提出将露天转地下开采留设的境界顶柱简化为“梯度荷载作用下的悬臂梁超静定”平面应变力学模型, 采用弹性力学半逆解法求解出境界顶柱各应力分量的解析解, 并以抗拉强度为破坏指标, 计算出境界顶柱合理厚度的理论值。运用此方法计算出姑山铁矿露天转地下开采境界顶柱合理厚度的理论值, 并以此为基础数据, 结合FLAC3D数值模拟获得了该矿境界顶柱合理厚度范围为23～25 m。
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| 关 键 词： | 露天转地下开采 进路充填采矿法 境界顶柱 顶柱厚度 姑山铁矿 力学模型 数值模拟 |
| 收稿时间： | 2018-10-15 |
Reasonable Thickness of Crown Pillar for Transition from Open-pit to Underground Mining in Gushan Iron Mine |
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| LONG Zhou-biao,HAN Li-jun,MENG Qing-bin,LI Xing-quan,LIU Xiao-shuai,TAO Lu.Reasonable Thickness of Crown Pillar for Transition from Open-pit to Underground Mining in Gushan Iron Mine[J].Mining and Metallurgical Engineering,2019,39(2):24-29. |
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| Authors: | LONG Zhou-biao HAN Li-jun MENG Qing-bin LI Xing-quan LIU Xiao-shuai TAO Lu |
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| Affiliation: | 1.State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China;
2.School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China |
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| Abstract: | For Gushan Iron Mine, adopting the drift and fill mining method after the transition from open pit to underground mining, it was proposed that the design of crown pillar shall be simplified to the plane stress model of “statically indeterminate cantilever beam under gradient load”. Then, the semi-inverse solution method of elastic mechanics was used to solve the analytical solutions of the stress components of the crown pillar within the boundaries, and with the tensile strength as a damage index, the theoretical value of the reasonable thickness of the boundary crown pillar was calculated. Based on the theoretical value obtained with such method for Gushan Iron Mine, the reasonable thickness of the crow pillar within the boundaries was determined to be within the range of 23~25 m by using FLAC3D numerical simulation. |
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| Keywords: | transition from open-pit to underground mining drift and fill mining method crown pillar within boundaries crown pillar thickness Gushan Iron Mine mechanical model numerical simulation |
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