司家营厚大矿体矿房分步式开采结构工程分析
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摘要
针对司家营铁矿井下大规模开采围岩的潜在失稳性,运用UDEC软件进行数值计算,分析不同开采阶段地压变化,应力云图揭示了采场顶板岩体内应力场向有利于维护围岩稳定的拱形承载结构演化,该结构的拱失f和拱跨L近似相等。同时在拱脚矿体上下盘边界和拱顶风化带岩层共显现出3个高压应力区,其中上下盘处应力集中,表明该部位矿房应快速组织充填。基于数值分析结果,建立了拱形桁架结构工程体系,并对该体系力学模型进行了分析,得出一、二步矿房宽度比值,并设计了厚大矿体的矿房宽度为20 m,安全系数达1.96。通过数值计算预警及理论分析优化设计,可有效保证地下规模化开采的安全性和连续性。
In view of the potential instability of surrounding rock in large-scale underground mining in Sijiaying,UDEC software is used to carry out numerical calculation to analyze the variation of ground pressure in different mining stages. Stress nephogram reveals the evolution of arch bearing structure in roof rock mass of stope,which is beneficial to maintaining the stability of surrounding rock. The arch rise f and arch span L in this structure are approximately equal. At the same time,there are three high pressure stress zones in the upper and lower boundaries of orebody at the arch foot and the rock strata of the arch roof weathering zone. The stress concentration in the upper and lower wall suggests that the ore room in this area should be filled quickly. In addition,based on the results of numerical analysis,the arch truss structure engineering system is established. The mechanical model of the system is analyzed by the force method,and the width ratio of one-step room to two-step room is obtained. The width of the room with thick and large orebody is designed to be 20 m,with the safety factor of 1.96.The safety and continuity of large-scale underground mining can be effectively guaranteed by early warning of numerical calculation,and optimization design based on theoretical analysis.
In view of the potential instability of surrounding rock in large-scale underground mining in Sijiaying,UDEC software is used to carry out numerical calculation to analyze the variation of ground pressure in different mining stages. Stress nephogram reveals the evolution of arch bearing structure in roof rock mass of stope,which is beneficial to maintaining the stability of surrounding rock. The arch rise f and arch span L in this structure are approximately equal. At the same time,there are three high pressure stress zones in the upper and lower boundaries of orebody at the arch foot and the rock strata of the arch roof weathering zone. The stress concentration in the upper and lower wall suggests that the ore room in this area should be filled quickly. In addition,based on the results of numerical analysis,the arch truss structure engineering system is established. The mechanical model of the system is analyzed by the force method,and the width ratio of one-step room to two-step room is obtained. The width of the room with thick and large orebody is designed to be 20 m,with the safety factor of 1.96.The safety and continuity of large-scale underground mining can be effectively guaranteed by early warning of numerical calculation,and optimization design based on theoretical analysis.
引文
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[2]魏晓明,李长洪,张立新.急倾斜厚大矿体采矿方法的选择[J].金属矿山,2014(4):31-34.Wei Xiaoming,Li Changhong,Zhang Lixin.Selection of mining methods for steeply inclined large and thick ore body[J].Metal Mine,2014(4):31-34.
[3]刘辉,刘小阳,邓喀中,等.基于UDEC数值模拟的滑动型地裂缝发育规律[J].煤炭学报,2016,41(3):625-632.Liu Hui,Liu Xiaoyang,Deng Kazhong,et al.Developing law of sliding ground fissures based on numerical simulation using UDEC[J].Journal of China Coal Society,2016,41(3):625-632.
[4]翟会超,任凤玉,南世卿.倾斜空区顶板三铰拱轴曲线结构自稳分析[J].东北大学学报:自然科学版,2015,36(11):1629-1632.Zhai Huichao,Ren Fengyu,Nan Shiqing.Analysis of the stability of three-hinged arch axis curve structure of tilted roofs[J].Journal of Northeastern University:Natural Science,2015,36(11):1629-1632.
[5]Liang C,Mamadou F.Multiphysics modeling of arching effects in fill mass[J].Computers and Geotechnics,2017,83:114-134.
[6]Don S S S,Erkan T,Mohammad W A A.Designing an optimal stope layout for underground mining based on a heuristic algorithm[J].International Journal of Mining Science and Technology,2015,25(5):767-772.
[7]Wang P,Li H Q,Li Y,et al.Stability analysis of backfilling in subsiding area and optimization of the stoping sequence[J].Journal of Rock Mechanics and Geotechnical Engineering,2013,5(6):478-485.
[8]Guo Y L,Zhao S Y,Dou C.Out-of-plane elastic buckling behavior of hinged planar truss arch with lateral bracings[J].Journal of Constructional Steel Research,2014,95:290-299.
[9]赵思远,王宏,郭彦林.平面桁架拱平面外弹性稳定性及设计方法研究[J].建筑结构,2016(S1):523-527.Zhao Siyuan,Wang Hong,Guo Yanlin.Out-of-plane elastic stability and design method of planar truss arch[J].Building Structure,2016(S1):523-527.
[10]陈经纬,施刚,陈宏.大跨空间桁架与混凝土支承结构体系协同工作分析[J].四川建筑科学研究,2016,42(1):6-10.Chen Jingwei,Shi Gang,Chen Hong.Analysis of cooperative effect of large span space truss with supporting concrete structure[J].Sichuan Building Science,2016,42(1):6-10.
[11]张兵,胡文达,李辉谦,等.比希铜矿主矿体深部保安矿柱稳定性分析[J].现代矿业,2015(2):104-107.Zhang Bing,Hu Wenda,Li Huiqian,et al.Stability analysis on the deep safety pillars of the main orebody of Chambishi Copper Mine[J].Modern Mining,2015(2):104-107.
[12]王磊,于振.基于弹塑性理论和数值模拟的采空区稳定性分析[J].现代矿业,2018(6):32-33.Wang Lei,Yu Zhen.Stability analysis of goaf based on elastic-plastic theory and numerical simulation[J].Modern Mining,2018(6):32-33.