The Study Of Preventing Technology And Safety Assessment On Electric Transmission Line Around The Coal Waste Areas

In the light of the research of the empty mining district increasing and the danger of the transmission lines of electricity, research have deeply done on exploring technology of the empty mining district, the law of rock body deforming and earth surface sinking, geological and mining factors influencing on the earth surface movement, transforming technology of overhead transmission lines of electricity.Through exploring technical research, a m×n matrix measure data computing method has been researched in theory successfully, which provides theoretical foundation for the high density electricity method to explore in rough three-dimensions, and which solves the problem that two-dimensional structure section cannot provide the space distribution of the empty mining district.In the research field of overhead transmission lines of electricity on empty mining district, mechanics analysis and computing technology has been initially applied, the law of rock body deformation in the empty mining district has been studied systematically and quantitatively,"three area theory"has been expounded quantitatively, and the connection between macroscopic law and quantitative prediction has been established. Among them, elasticity and plasticity model method is applied into engineering calculation to overcome the shortcoming that physical model used extensively is too complicated while mathematical model cannot reflect the rock body's physical mechanics essentially.The impact geological and mining factors on earth surface movement is investigated further, indicates: (1) Vertical sink and horizontal displacement is in inverse proportion to elastic mould amount E, and increasing obviously as cohesive force C and friction angle ? reduced. (2) The factors, such as coal seam inclination, exploiting depth and width, exploiting size, repeatedly exploiting influence, exploiting mode, etc., have conspicuous effect on the earth's surface deformation. Through susceptibility analysis on quantitative description influence factors, the influencing degree that effect on earth surface subside displacement can be gained: thickness of coal seam, depth of coal seam, elastic mould amount, cohesive force and angle of friction.Through the transforming technical research on the overhead transmission lines of electricity on empty district, the following are drawn: (1) Vertical sink descent altitude is generally slight more than half of vertical sinks; (2) The additional force out of horizontal displacement to tower pole is very big, and horizontal tension influence out of straight pole tower to overhead transmission line of electricity is big too, the biggest function of additional force is moving pole tower, the additional force acting on overhead transmission lines of electricity is mainly concentrated no more than 5 shelf closed, and it have great impact on the pole tower, such as tensional, corner, terminal pole towers and so on; (3) Slope has little effect on tension of overhead transmission lines of electricity, such as straight pole tower, great effect on bearable pole tower such as tensional, corner, terminal pole towers and so on. According to the research above, preliminary differentiate standard of the empty mining district operating overhead transmission lines of electricity has been adopted, and in the light of all kinds of destruction of the empty mining district, a series of according transforming measures have been adopted, including phased research results, such as"adjustable conjunctional roof beam foundation in succession"and"the section replacement electrification".The research results mentioned above have been proved in the 220KV Yilin line #48~#50 improvement project in Wuhai quarry empty district, it shows the great applicable value.