蒙库铁矿床东矿段露天采场排土情况下下部空区岩体稳定性分析

发布时间：2018-08-23 18:48

【摘要】：本次富蕴金山矿冶有限公司蒙库铁矿床东矿段铁矿露天采场稳定性评价工作,主要在现场调研及资料收集的基础上,依据《富蕴金山矿冶有限公司蒙库铁矿床东矿段铁矿露天采场闭坑报告》,对富蕴金山矿冶有限公司蒙库铁矿床东矿段铁矿露天采场现状进行分析,采用通用有限元软件ANSYS、MIDAS等手段对富蕴金山矿冶有限公司蒙库铁矿床东矿段铁矿尾矿库露天采场现状做出评价,得出露天采场现状的稳定性结论,为合理确定露天采场最大排土高度提供理论依据,以避免露天采场下方的岩体发生坍塌事故造成对地下井巷和采矿工程的安全威胁。本次研究分析了露天采场地质概况,确定稳定性计算研究方法,选择各岩土层的物理力学指标,建立二维模型,对现状露天采场各种不同排土高度状况下的稳定性进行计算分析,从而判断不同排土高度状况下露天采场下方岩体安全状况得到主要结论如下:(1)排土场排土高度达到96m(此时排土高度已达到露天采场边坡的最高点标高1008m),其下方岩体的应力水平仍处于安全范围之内(ANSYS分析安全系数为3.80,MIDAS分析安全系数为3.47),露天采场整体稳定性安全系数也能满足要求。(2)由于计算结果显示,即使排土场排土高度达到露天采场边坡的最高点,其下方的岩体仍处于稳定状态,因此未对露天采场边坡进行稳定性分析。在排土高度尚未到达该点时,露天采场边坡仍有发生滑坡的可能性,应采取有效措施防止人员、车辆进入该区域,以防发生危险。(3)应采取有效措施对850m水平采空区顶板和露天采场边坡实施必要的位移、地下水位、视频等监测,预防突发事故。(4)该露天采场汇水面积不大,但夏天暴雨时仍然存在采场底部积水的可能性,因此,应采取有效的截水措施,防止内部积水导致岩石软化,危及下部采场的安全。
[Abstract]:The evaluation of the stability of the open-pit stope of the east section of the Mengku iron deposit in Fuyun Jinshan Mining and Metallurgical Co., Ltd. is mainly based on the on-the-spot investigation and data collection. According to the report of Open pit closed pit of iron mine in east section of Mengku iron deposit of Fuyun Jinshan Mining and Metallurgical Co., Ltd., this paper analyzes the present situation of open pit of iron ore in east section of Mengku iron deposit of Fuyun Jinshan Mine and Metallurgical Co., Ltd. By means of general finite element software ANSYS,MIDAS and so on, this paper evaluates the present situation of the open pit of the iron tailings reservoir in the east section of the Mengku iron ore deposit of Fuyun Jinshan Mining and Metallurgical Co., Ltd., and draws a conclusion of the stability of the present situation of the open pit. This paper provides a theoretical basis for reasonably determining the maximum dump height of open-pit stope in order to avoid the safety threat to underground roadway and mining engineering caused by the collapse of rock mass under open-pit stope. In this study, the geological survey of open-pit stope is analyzed, the stability calculation method is determined, the physical and mechanical indexes of each rock and soil layer are selected, and the two-dimensional model is established. The stability of open-pit stope under various dumping heights is calculated and analyzed. The main conclusions are as follows: (1) the dumping height of the dump reaches 96m (at this time it has reached the highest elevation of the open-pit slope 1008m), and its lower calcite is lower. The stress level of the body is still within the safe range (the safety factor of ANSYS analysis is 3.80 and midas is 3.47), and the overall safety factor of open-pit stope stability can also meet the requirements. (2) because the calculation results show that, Even if the height of the dump reaches the highest point of the open-pit slope, the rock mass below it is still in a stable state, so the stability analysis of the open-pit slope has not been carried out. When the dump height has not reached this point, there is still the possibility of landslide on the slope of the open pit, and effective measures should be taken to prevent persons and vehicles from entering the area. (3) effective measures should be taken to carry out necessary displacement, monitoring of groundwater level, video and so on to prevent sudden accidents in 850m horizontal goaf roof and open-pit slope. (4) the area of water catchment in the open pit is not large, However, there is still the possibility of water accumulation at the bottom of the stope during heavy rain in summer. Therefore, effective water interception measures should be taken to prevent the internal water from softening the rock and endanger the safety of the lower stope.
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD325

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