金川二矿区地表裂缝沉降变化规律及形成机制分析

我国最大的充填法开采矿山?金川二矿区在采用胶结充填采矿法开采18年后发现了大范围的山体开裂和地表裂缝,引起了人们的关注。因此,研究充填法开采矿山地表裂缝沉降变化规律及形成机制成为一项重要课题。以实地踏勘调查与地表GPS监测的长期现场数据为依据,阐述了金川二矿区自2000年2月以来呈现大范围地表岩体沉降开裂的现象。通过裂缝区调查、测绘与槽探,揭示了地表裂缝区范围与特征;从沉降裂缝区的形成、岩体移动与变形规律及沉降裂缝发展趋势分析了金川二矿区地表裂缝沉降变形规律;由矿区地质构造、围岩应力分布出发,结合高强度采矿活动的影响,探讨了地表裂缝沉降的形成机制及影响因素。最后,对金川二矿区地表沉降开裂现象提出了认识与建议。

Analysis of Surface Settlement Crack Distortion Law and Formation mechanism in No.2 Mining Area of Jinchuan Nickel Mine

It was concerned that a wide range of mountain crack and surface crack was found in Jinchuan No.2 mining area,China's largest filling mining mine,after using cement filling mining 18 years.Therefore,the study of settlement crack distortion law and formation mechanism of filling mining mine has become an important subject.In this paper,basis on the long-term field data get by on-the-spot investigation and the surface GPS monitor,surface rock mass subsidence dehiscence in a wide range of Jinchuan No.2 mining area since February,2000 is elaborated.Through the crack area investigation,the mapping and the trenching,the surface crack area scope and the characteristic are promulgated;according to the subsidence crack area formation,the rock mass migration and the distortion rule,and the subsidence crack trend of development surface crack subsidence distortion rule of Jinchuan No.2 mining area are analyzed;in term of geologic structure,surrounding rock stress distribution embark,and the influence of high strength mining,the surface crack subsidence formation mechanism and the influence factor has been discussed.Finally,the preliminary understanding and the suggestion to the Jinchuan No.2 mining area surface subsidence dehiscence phenomenon are proposed.