Analysis of uplift bearing capacity for slope crest foundation of power transmission line in slopes terrain

Abstract:The slope crest foundation is a common type of foundation which is often used in power transmission line through the slopes terrain , the study on the uplift bearing capacity of this foundation is still at the initial stage in China.Firstly , the parameter inversion of rock mass mechanics parameters were inversed by FLAC " based on the results of in-situ test on the flat ground in Anhui.Secondly, 138 numerical simulations of slope crest foundation were calculated according to the different distances between slope shoulder and foundation edge , foundation depths and slope angles by using the inversion parameters.And it is concluded that the failure modes of the slope crest foundation can be divided into the shallow buried mode and the deep buried mode by comparing the vertical and horizontal displacement nephogram and the plastic zone distribution of the simulation results.Meanwhile , based on the analysis of the decay rate of ultimate uplift load, it is summarized that the uplift bearing capacity of slope crest foundation increased with the increase of the distance between slope shoulder and foundation edge and foundation depth , but decreased with the increase of slope angle.The concept of minimum safe top distance of slope foundation is proposed to provide scientific basis and reference for design and construction of transmission line slope foundation.