司家营铁矿厚大矿体空场嗣后充填开采协同支护方法
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摘要
针对司家营铁矿倾斜急倾斜厚大矿体井下规模化开采的采场稳定性问题,立足充分释放矿岩体承载能力,同时利用注浆支护技术协同维护采场围岩稳定性,形成包含4个承载机构的拱悬挂桥梁支护承载体系。根据拱形承载特性,研究简易的支护计算方法和工程岩体结构内力计算模型,并应用于司家营南区地下矿,确定了在矿房长度方向上布设6排,每排3根长20 m的悬挂锚索。同时,运用UDEC进行数值分析,顶板位移从2.5 m降到0.5 m的计算结果有效验证了支护方案的可靠性,可有效保证司家营南区地下大规模开采安全,确保地表环境不受破坏。
In view of the stope stability of the downhole large-scale mining for the steeply inclined and thick ore body in Sijiaying Iron Mine,based on fully releasing in the bearing capacity of the rock mass, the grouting support technology was used to cooperatively maintain the stability of the surrounding rock in the stope,and the supporting system of the hanging arch bridge with 4 bearing structures was formed. According to the arch bearing characteristics,the simple support calculation method and the calculation model of the engineering rock structure internal force were studied and applied to the underground mine in the southern section of Sijiaying Iron Mine. 3 pieces of suspended anchorage cables with 20 m in length per row for 6 rows were set up in the length direction of the ore room. At the same time,through the numerical analysis by UDEC,the calculation results with the roof displacement from 2.5 m to 0.5 m effectively verify the reliability of the support scheme,which can effectively ensure the underground large-scale mining safety in the southern section of the Sijiaying iron mine,and ensure the surface environment not damaged.
In view of the stope stability of the downhole large-scale mining for the steeply inclined and thick ore body in Sijiaying Iron Mine,based on fully releasing in the bearing capacity of the rock mass, the grouting support technology was used to cooperatively maintain the stability of the surrounding rock in the stope,and the supporting system of the hanging arch bridge with 4 bearing structures was formed. According to the arch bearing characteristics,the simple support calculation method and the calculation model of the engineering rock structure internal force were studied and applied to the underground mine in the southern section of Sijiaying Iron Mine. 3 pieces of suspended anchorage cables with 20 m in length per row for 6 rows were set up in the length direction of the ore room. At the same time,through the numerical analysis by UDEC,the calculation results with the roof displacement from 2.5 m to 0.5 m effectively verify the reliability of the support scheme,which can effectively ensure the underground large-scale mining safety in the southern section of the Sijiaying iron mine,and ensure the surface environment not damaged.
引文
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[4]张顶立.隧道及地下工程的基本问题及其研究进展[J].力学学报,2017,49(1):3-21.Zhang Dingli.Essential issues and their research progress in tunnel and underground engineering[J].Chinese Journal of Theoretical and Applied Mechanics,2017,49(1):3-21.
[5]罗生虎,伍永平,张嘉凡.围岩-锚固体流变控制机制及支护最优化设计[J].岩土力学,2017,38(1):124-131.Luo Shenghu,Wu Yongping,Zhang Jiafan.Rheology control mechanism of surrounding rock mass and anchorage body and its support design optimization[J].Rock and Soil Mechanics,2017,38(1):124-131.
[6]翟会超,任凤玉,南世卿.急倾斜厚大矿体矿房阶段爆破技术[J].东北大学学报:自然科学版,2017,38(10):1486-1490.Zhai Huichao,Ren Fengyu,Nan Shiqing.Stage blasting technology of large and thick steeply inclined orebody[J].Journal of Northeastern University:Natural Science,2017,38(10):1486-1490.
[7]Manoj N,Bagde,Hani S,et al.Numerical analysis of backfill face stability[J].Procedia Earth and Planetary Science,2015,11:173-179.
[8]Wang Ping,Li Huiqiang,Li Yan,Cheng Bo.Stability analysis of back-filling in subsiding area and optimization of the stoping sequence[J].Journal of Rock Mechanics and Geotechnical Engineering,2013,5(6):478-485.