露天矿坑端帮陡倾巨厚铁矿体开采诱发边坡变形破坏规律预测

发布时间：2018-04-26 22:43

本文选题：露天矿坑 + 端帮开采　；参考：《中国地质大学（北京）》2015年硕士论文

【摘要】：露天矿坑端帮矿体开采将诱发矿坑边坡发生变形破坏,合理预测边坡破坏规律可以有效地避免滑坡造成的危害。本文以眼前山铁矿为例,利用离散单元法预测矿坑端帮陡倾特厚铁矿体开采诱发的边坡变形破坏规律。主要工作与成果如下： (1)利用项目组自主研制的三维地质建模软件RockModel,为3DEC建立考虑复杂地质界面与节理分布特征的数值模拟计算模型；根据室内岩石力学实验与现场节理特征统计分析成果,确定岩体与节理的力学参数。 (2)以东端帮第一层(高程范围为-51m--69m)矿体开采造成的边坡破坏特征实测数据为依据,利用3DEC进行开采模拟,验证计算模型与力学参数的有效性。 (3)在此基础上,依次模拟开采东端帮第二层-第四层矿体(高程范围分别为：69m～-87m、-87m～-105m、105m～-123m),预测开采过程中矿坑边坡变形与破坏规律。分析结果表明：随着开采深度的逐步增加,采空区顶部围岩不断垮落,南北侧岩体分别沿两组优势节理面向采空区内滑动;采空区上方边坡坡面产生沉降并向坑内滑动,北侧边坡坡面向南西方向移动,而南侧边坡坡面向西偏北方向移动；边坡坡面开裂范围逐渐扩大,且北侧范围始终大于南侧破坏范围。
[Abstract]:In this paper , using discrete element method to predict the slope deformation damage rule induced by the mining of steep dip - heavy iron ore body at the end of the pit by using the discrete unit method .

The main work and results are as follows :

( 1 ) Using the 3D geological modeling software RockModel developed by the project team , a numerical simulation model of complex geological interface and joint distribution feature is established for 3DEC ;
The mechanical parameters of rock mass and joints are determined according to the statistical analysis results of indoor rock mechanics and on - site joint characteristics .

( 2 ) Based on the measured data of the slope failure characteristics caused by mining of the first layer ( elevation range -51m - -69m ) in the east end , the validity of the calculation model and the mechanical parameters is verified by using 3DEC for mining simulation .

( 3 ) On the basis of this , the second - fourth layer of orebodies ( elevation range : 69m ~ -87m , -87m ~ -105m , 105m ~ -123m ) are simulated in this order .

The results show that along with the increasing of the depth of mining , the surrounding rock in the top of the mined - out area is continuously destroyed , and the north - south rock mass slides along two sets of dominant joints in the mined - out area respectively ; the slope surface on the upper side of the mined - out area generates settlement and slides into the pit , and the north - side slope slope faces south - west direction , while the south - side slope is moving towards the north - west - north direction ;
The crack range of the side slope is gradually enlarged , and the north side range is always larger than that of the south side .

【学位授予单位】：中国地质大学（北京）
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD854.6

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