Seismic Effect on Site Condition of Transmission Line in Southwest Mountainous Area

doi:10.3969/j.issn.1000-7229.2015.06.007

Abstract

Abstract:

Most of southwest mountainous areas are underlying bedrock ground cover layer, and the terrain is steep. In the transmission line engineering, the influence of the site stability under seismic action on the safety of upper tower structure is obvious. At present, there are some researches on the influence of different site conditions on seismic effect, but there are few researches for the southwest steep terrain, especially for the influence of the bedrock strength in the rock sites on the seismic effect of the site. Taking a typical transmission line site in southwestern mountainous area as research object, with using numerical analysis software FLAC3D and time history analysis method, this paper analyzed the seismic peak acceleration amplification coefficient on site, the variation characteristics of the permanent displacement on site along with the cover thickness and bedrock strength, and discussed the seismic effect of different site conditions in southwest mountainous area. The results show that: with the increase of cover thickness, the peak acceleration amplification coefficient gradually decreases, and the permanent displacement gradually increases; with the increase of bedrock strength, the vertical peak acceleration amplification coefficient gradually increases, and the horizontal peak acceleration amplification coefficient and the permanent displacement gradually decrease.

Key words: site condition, southwest mountain area, transmission line, seismic effect

CLC Number:

TM 75， TU 44

YU Haojun，PENG Sheqin，ZHAO Qihua，CHEN Jibin，DING Zihan. Seismic Effect on Site Condition of Transmission Line in Southwest Mountainous Area[J]. ELECTRIC POWER CONSTRUCTION, 2015, 36(6): 40-45.

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