Application Of The Technology Of Dynamic Monitoring By Network Parallel Electrical Method In Overburden Failure

The deformation of overburden strata of mining face caused by coal mining bring Serious impact on the mine efficient production, and the height of a permeable fracture zone caused by rock mass destruction is the important technical parameter of coalmine water disaster's prophylaxis and treatment. Presently, technology obtaining the height of overburden deformation is ground location and numerical simulation, and testing technology underground is relatively less. This paper bases on the theory of electrical imaging technology , the main reasearch was about how to detect overburden failure during the coal face by using network parallel electrical method acquisition technology to supply effective technology indemnification serve for coalmine safe production.Paper had been builed survelliance systems acconding to difference kinds of geology condition and coal face thickly, it designed on the uppper plate to depth,dip angle and electrode quantity in coal face and constructed dynamic observing ststem for monitoring overburden failure condition. The paper main reasearched about how to data processe : in natural electric potential method analysis coal mining process, natural electric potential changes condition; one time of field excitations electric current follows analytical current supply electric current in the voltaic change condition supplying electricity in coal mining process; the resistivity method backcalculation technology analyses coal mining process Central resistivity change condition. Comprehensive analysis coal seam had exploited rock mass destroying the development law by using all above three kinds method data handling result.The method had applied to the fact that 342 face of Qi Nan coal mine and the 3432 face of Xu tuan coal mine ,the gains conclusion :Working face had moved forward to monitoring point unceasingly, natural electric potential value had reduced change trend rising from the power-up , all together point of inflection of electrode electric potential value change can do the border destroying abnormal area range for covering a rock mass;A field excitation electric current value had reduced the change trend rising from the power-up , it had demonstrated the process going ahead covering a rock mass breaking ,that it had been leading water passage connection and the breakstone compaction, all together point of inflection of electrode electric current value change can judge for abnormal area range border; Apparent resistivity value had expanded unceasingly in the range rising above goaf, part area resistivity value was worth background of resistivity thousandfold even .Bed separation, leading infection, caving zone and fractured zone had been developmented significantly. The methon had turn to be able to the dynamic monitoring the simultaneous growth of crack form manifesting law as well as the spirit moves ore pressure's penetrating, backstoping reality verifies and sounds other method data contrast with in the pit, the gains conclusion basically identical. The paper haved pointed out at the same time data processing of network parallel electrical method naturally problem and researched direction in future.