| This article is for the North belt of Wushan Copper ore mining process of filling body and surrounding rock roof damage phenomena on the North belt engineering geological investigation and on-site regional instability and failure investigation, the instability of the North belt backfill damage in the form of classified, analyzed and summarized the impact of the North belt dominant factor in the stability of backfill. Construction of the actual situation according to the site using the FLAC 3D finite difference numerical analysis software of roof stability of backfill and surrounding rock, stress, displacement and plastic zone variation. In full knowledge of the mechanical properties of backfill under the premise of continuous monitoring using acoustic emission technique to monitor the stability of backfill, acoustic emission in rock by the stability and stabilize the situation. This article made the following findings:(1) Underground unstable failure mainly as follows: the central roof damage backfill; filling body and the end of a solid wall of rock or ore body contact area prone to falling accidents; recovery side help for the soft broken rock, the false roof caving; filling materials such as segregation.(2) For the underground destruction of several forms of instability, obtained the main factors leading to rock failure: 1. Orebody their existing environment, that is, ore body in the fractured zone, the fault structure and development, ore body was Bad engineering geological interlude, destroyed the integrity of the orebody; 2. external factors, mainly filling the accident and the filling material segregation.(3) the use of three-dimensional finite difference numerical analysis software FLAC 3D simulation of Wushan Copper Mine in the mining and roof to help backfill the wall surrounding rock features of differentiation, revealing characteristics of backfill and surrounding rock stress and deformation laws for monitoring equipment layout and Supporting selection for.(4) On-site monitoring, the results of monitoring acoustic emission event rate or to the rate of change in acoustic emission rate or energy rate, acoustic emission event rate or that the relative strength index of rock mass stability evaluation. From the analysis results were compared with the actual situation, know that acoustic emission monitoring of the stability of backfill, or a more effective monitoring. |
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