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This paper analyzes a fractured lightning rod on a tower structure at a 500kV substation. By examining the residues of the rods, and utilizing simulation test and finite element analysis, the causes for this incident are discussed in detail, and a technical rationale is provided for preventative measures of incidents of this type.

Assuming the noise from the composition of the white noise and non - white energy limited noise. H filter considers the worst condition of limited energy noise, but the influence of white noise was ignored. At the noise signal and the system norm based on the analysis, using the hybrid filter optimization index J as the optimization goal, and its physical meaning is given. Considering the merit and defect of the H2 and H filter scheme, the filter by Riccati equation solution was established. A simulation example was shown at last. Key words: Mixed filter; Slope deformation monitoring ; Filtering estimation error; Riccati equation

Nowadays, the safety effection study of the surface explosion operations on underground cavern safety become more and more important along with engineering construction's development. In this paper, effection of open stope surface explosive operations on underlying gap cavern as an example on studying the effection of blasting shock on underground cavern stability with the method of field monitoring and numerical simulation.When the explosion source and seismic gap are almost in the same level, the longitudinal wave leads the role of damage effect. The most dangerous part of the mined-out area is the spandrel. The collapse models of mined-out area manifest are as follows, cracks appear on 45. Inclined top of surface in mined-out area, the spandrels appear broken, surface cracks expand further, broken parts of spandrel are aggravated, arch waist are in jog and the side collapse inward in the end.