Funing, Yunnan The Tail Hole Copper-nickel Mine Mining Engineering Geology Conditions Study

Funing WeiDong copper-nickel mine is located in Funing-Mafic-rocks which is one of a favorable area for copper-nickel mineralization in Yunnan Province. The study area altogether proved8ore body, whose top plates depth generally less than50m. At this stage one of the largest ore body is being mined at a small-scale with the only tunnel. With the deepening of prospecting degree, the mining area is preparing to exploit at a large-scale.The evaluation of engineering geological conditions about mining is a necessary prerequisite for safe production. Recently small-scale mining has led the tunnel, stope to fall at varying degrees. Although there were no casualties, but to a certain extent,the production of the mine has been restricted by this.Therefore,it is necessary to evaluate the mining engineering geology scientific&systematic,as well as to properlly grasp the engineering geological conditions.So that appropriate measures can be taken to avoid or reduce the occurrence of geological hazards,to ensure mine production safer, more scientific and more efficient.This paper based on the mine actual situation,for the purpose of mine production safety.,by the field survey of hydrology&engineering geology joints statistical analysis, combined with the rock mechanics experiment indoor, completed the evaluation of engineering rock mass classification and support analysis, at the same time,fuzzy mathematics was being used to establish surrounding rock tability evaluation model with which calculated and evaluated the stability of surrounding rock of underground engineering in different rock masses&direction. optimization scheme was selected to provide a scientific basis for post mining activities in the engineering design, tunnel arrangement. The main details of the work are as follows:1, By collecting the original data, looking up the extensive literature, summarized the methods of mining engineering geological conditions;2, Use of hydrological&engineering geological investigations, some research has been taken in the study area,which including surface engineering geological survey, tunnel record joints measurement and statistics etc.In order to Complete the division of engineering geological petrofabric and determine dominant structure plane. At the same time, to teste rock strength parameters which including compressive strength, shear strength and tensile strength. Then to analyze the test result.3, With the RMR rock classification method and the classification of the Q system, completed the classification evaluation of engineering geological petrofabric. analyzed how would the dominant structure plane affect on surrounding rock classification and its stability at different direction.With the Q system classification result, preliminary determined the maximum span without supporting of each engineering geological petrofabric, to provide a theoretical reference for later underground engineering supporting. After that, RMR and Q classification results were compared and analyzed, and verified the correlation between the two.4, Analysis of the engineering geological problems and its failure mechanism in study area. Analyzed and summarized the mining engineering geological conditions influencing factors.With the fuzzy mathematics method, established comprehensive fuzzy evaluation model with wich calculated and determined the comprehensive judgement vectors B of the stability of surrounding rock of cnderground construction in different lithology and direction, systems analyzed each different situations and determined optimal excavation mode of underground engineering.