| The underground metal mine engineering is a very complicated system engineering withbad ventilation and visibility, underground pressure and hydrological condition is no easy toobserve. Compared with the current situation in developed countries, the mining machineryandequipment in our country are not as sophisticated, and with high working intensity, largeamount of the labor force are less mechanized and are still in the process of strengthening theirsafety consciousness. The accidents and deaths is second of the mine engineering, follow themine. Therefore, mining accidents took place in high frequency, causing large casualties andserious economic losses.In this paper, bycomparing the casualties with corresponding developing trend in all kindsof accidents, accident of the gold mining in recent years are analyzed. From the statistic data itcould be observed that the roof collapse and slabbing are the main reason, and they areincreasingly happening, threatening life safety of the mining staff. So it is necessary to conductresearch on the effective monitoring for roofcollapse and slabbing during gold mining, which isalso the main researchtopic ofthis paper.Based on the study about development status of metal mine safety monitors in the world,considering several kinds of equipments and systems with their monitoring factors andprinciples, comparison of advantages and disadvantages among the different equipments weremade. Considering the geologic environment and mining characteristics of the Xiadian GoldMine, it is advised that the fiber grating sensing system should be applied in order to monitorthe roofcollapse and slabbing,The monitoring principle of the fiber optic grating is analyzed, and it could be seen that itis superiors to traditional monitoring equipments, and it has already successfully applied inmany other fields. Referring to its recent application, it is put forward that the strain monitoringin the rock could be replaced by the strain monitoring on a certain number of anchor bolts, andin this method the safety monitoring could be carried out for the roof collapse and slabbingaccident in a long term.Firstly, the indoors experiments are carried out for the monitoring plan to make sure thatthe strain and stress conduction relationships would be confirmed between the anchored rockand the anchor bolts, and the errors distribution and the rock crack threshold value and also be identified. before the anchor bolts are punched into the rock., Then the anchor bolts areprocessed in a certain way, with the fiber optic grating sensors installed in it. Consequently themonitoring test results can be observed, and it could be helpful for the fiber optic gratingmonitoring promotion with technologysupport and test data.After installing the monitoring system at the mining field, blasting operation and thesystem monitoring data are observed and recorded. Considering the influences of the staffdisturbance, the noises and vibration caused by mine cars, bolting machines and blowers etc.,the results data may be affected to some extent, but generally speaking, the results data couldbasically satisfy the anticipative monitoring demands, thus the forecast and pre-warning for theroof collapse and slabbing accidents could be realized, so the life safety of the working staffcould be confirmed. |
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