Investigation On The Technologies Of High Efficiency Mining And Ground Pressure Monitoring And Control For Deep Metal Deposit Mining

Developing the deep metal deposit on a large scale is one of the most important tasks which the continuable developing of domestic mining industry is faced with. Aim at the key technical problems of deep mining of Dongguashan Copper mine, combining the tenth-5 national science and technology attacking task which is called the key technology research on deep copper deposit mining safely and efficiently under complex and difficult conditions, using the methods of theoretical analysis, numerical simulation and locale test, the paper carries out the research on the key technology of safe and effective mining and geostatic disaster monitoring and control in deep metal deposit mining.(1)Aim at the technique problem of mining method which is recommended by the primary design of Dongguashan Copper mine, the large-scale mining mothed of gradual incline metal deposit under the condition of high stress is studied. The disposal of the mining area and stope are optimized, the mine-preparing projects are simplified, and the ratio of mine-preparing is reduced. The reasonable width of the insulating jamb of panel and the structure parameters of stope are confirmed. The bottom structure of the stope of long-route and double-stope is put forward. The safe and efficient mining method of big panel, big stope and high throughput of deep and gradual incline metal deposit is worked out, which with the characteristics of sublevel excavation and filling the stope afterwards, and keeping the insulating jamb transitorily. The new method breaks the bottle-neck of the mining method which is recommended by the primary design effecitvely.(2)Using the method of numerical simulation, according to the mining technology congditions of Dongguashan Copper mine, the reasonable mining sequence of the safe and efficient mining way of big panel, big stope and high throughput of the gradual incline metal deposit deep mining is puts forward, which insure that the daily production of the mine can achieves ten thousand tons continually and keep the mining process. (3)The stress and displacement monitoring system which serves the key places of the mine and the microseismic monitoring system which serves the whole mining area of the mine have been designed and built. So that the real-time monitoring network of the disaster-causing environment of the rock burst and the geostatic disaster of deep mining in the Dongguashan Copper Mine is come true.(4)The geostatic activity law has been studied based on the microseismic monitoring system. The relative concentrating area of the geostatic actives is compartmentalized in the first mining area of the mine within different periods of time. The characteristics and cause of different underground vibration waves are obtained. The intensity distribution of the stress and displacement of the mining terrane has been gotten by using the principle of the quantification seismology. The geostatic activity situation and the stability of the insulating jamb and stope have been evaluated. The methods of identifying different kinds of waveforms and managing the routine seismic signal waveform have been also put forward, which improves the processing speed and veracity of the seismic signal.(5)The temporal and spatial change rules of the geostatic activity produced by the first mining area under the current mining condition are discovered preliminarily via the research of the macroseismic monitoring data. The results show that the geostatic activity mainly caused by the mining activities. The geostatic activity concentrating area in first mining area depends on the mining position and changes in time and space along with the change of the mining project position accordingly. Along with the mining progress, the stress redistributes continually and the stress and displacement are fluctuant. So far, the accumulative displacement and stress are less which indicates that the geostatic activity is weak. In conclusion, the terrane is stable now.(6)Combining the different rock's characteristic and positions of the mining laneways in Dongguashan copper mine, the breakage modes of the mining laneway have been confirmed, and the different maintenance motheds and correlative parameters have been also put forward.(7)According to the filling control mechanism of geostatic activity, considering the mining situation of Dongguashan copper mine, determine to use the full-tailing slurry with high concentration to fill the stope in order to control the geostatic disaster causing by mining. Via the ratio and strength experiment of full-tailing slurry and force analysis of the filling guard wall, the different cement-sand ratio of slurry for different places of the stope and the single filling height of the stope bottom structure have been determined.(8)The blasting vibration control technique for Dongguashan Copper Mine has been worked out. The attenuation rule of the blasting vibration and the dynamic stress ratio safety criterion of the mining laneway under the effect of blasting vibration are obtained. The depressing vibration measure by controlling segment dynamite quantity has been brought forward.The research results have been used in the first mining place of Dongguashan copper mine successfully and obtained a nice effect during the actual production of the mine.