Research On Special Accident Perils Zones Of Veinlet Belt Type Orebody Of Tongkeng Mine

Tongkeng Tin Mine is one of main mines in Huaxi Co.,Ltd. With uninterrupted exploitation in the mine, exploitation technology conditions are becoming very complex. Production and deveopment of mine is seriously restricted by loss of nature resources induced by ores spontaneous and a mass of goaf come into being after underground mining activities. In order to make full use of limited nature resources, ensuring security of miners and equipments, protect mine environment, it is necessary to adopt active and effective measures to the fire accident potential zone control and round pressure hazard treatment in mined-out areas. Furthermore, it is a precondition for sustainable development of mine in nowadays.In this thesis, the veinlet belt type orebody of Tongkeng Mine is the research object. A series of researches were unfolded base on the problems of accident potential zone control in the mine, which are as follows.(1) On the base of complex engineering problems, surrounding rock characteristic and exploitation technology conditions were analyzed. Ores spontaneou mechanism was studied, fire prevention and extinguishment was put forward. According to distribution of mined stopes, combined with geostatic inspection data and surface land collapse, dangerous zones were partitioned. Furthermore, numerical simulation was used to study the stability of goaf.(2) According to mining histroy as well as background of veinlet belt ore body and occurrence form of the three mainly ore bodies in Tongkeng mine, treatments to dangers in safety were put forward based on the principle on fast, high-efficiency and agility. The treatment areas included mined-out stope under level of 560m and fire isolating jamb together with goaf up level of 560m of veinlet belt ore body. Safety technical and economical results of feasible scheme were anaylzed. Measures of filling in part of goaf and mandatory caving of fire isolating jamb were choosed. (3) Study on parameters of parallel dense bunch-long-hole blasting technology was carried out in the end of this paper. Blasting parameters were calculated, blasting effect was analyzed and problems after biasing were discussed. What's more, blasting effect forecast and rock mass block index (RBI) mathematics model was constructed. Measures for prevention on nocuous effect of large blasting and further control technique of ground pressure were expatiated.