大采高多断层工作面综放诱发地表沉陷观测及数值分析  

IN-SITU OBSERVATION AND NUMERICAL ANALYSIS OF SURFACE SUBSIDENCE OF HIGH WORKING FACE WITH MULTI-FAULT INDUCED BY FULL-MECHANIZED MINING ACTIVITY

作　　者：杨建立[1,2] 左建平[1,3] 孙凯[1,2] 孟冰冰[3] 林轩[3] 

机构地区：[1]中国矿业大学煤炭资源与安全开采国家重点实验室,北京100083 [2]中国矿业大学资源与安全工程学院,北京100083 [3]中国矿业大学力学与建筑工程学院,北京100083

出　　处：《岩石力学与工程学报》2011年第6期1216-1224,共9页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家重点基础研究发展计划(973)项目(2010CB732002);教育部新世纪优秀人才支持计划(NCET-09-0726);霍英东教育基金会资助项目(121051)

摘　　要：从现场监测出发,分析近年来的监测数据,获得王庄矿大采高工作面在高强度综放开采条件下的地表沉陷规律,通过打孔观察冒落带、裂隙带的分布规律,得到最大下沉高度。然后基于不连续变形数值分析方法建立地表沉陷模型,模拟和分析多条断层对工作面综放开采的影响规律,并获得最大下沉高度。模拟最大沉陷值约为4.5 m,要小于实测值4.9 m,可能的原因是数值模型中只考虑该区4条较大的断层,而实际该区还有很多小的断层和小构造,并且实际地质情况远远比数值模型要复杂。最后比较相似条件下有无断层的地表沉陷规律,获得有无断层影响下的覆岩破断规律及移动规律,并比较两者的异同。In-situ observation has been carried out to investigate the surface subsidence law of high-intensity full-mechanized mining in Wangzhuang coal mine in recent years.Through the hole observation,the distribution laws of caving zone and fractured zone have been obtained based on these in-situ observation data;and the maximum subsidence value has also been monitored.Discontinuous deformation analysis（DDA） has been used to simulate the movement and failure of rock strata;and the surface subsidence model is established.Especially,effects of multiple faults on rock strata movement and surface subsidence have been considered in the numerical model.The maximum subsidence value is about 4.5 m based on DDA,which is less than in-situ measurement value of 4.9 m.The main reason is that the effects of four larger faults around the working face have been only considered in the numerical models.However,there are many small faults and other small geologic structures in the actual area.The actual geological conditions are far more complex than that considered in the proposed numerical model.Finally,the surface subsidence laws of working face with and without faults effects which have the similar geological conditions are compared.The laws of fracture and movement of the overlying rock strata with and without faults have been investigated,respectively;and the discrepancy between them has been discussed in detail.

关 键 词：采矿工程 大采高 综放开采 断层 地表沉陷 不连续变形分析 

分 类 号：TD32[矿业工程—矿井建设]