Abstract
This paper presents some analytical results of the physico-mechanical properties of typical three soil samples which are collected on the weathered layer
surface and their relation to slope failure at the survey sites: M-02, M-03 and M-05, from km 11 to km 13 on the 3B highway, belong to Backan province
of Vietnam. By using the Geoslope/W software, the analyses have determined the safety factor (Kmin) at three above survey sites to be 0.749, 0.660,
0.854. The topographic cross sections are used to calculate the safety factor using software to be flycam data. The obtained results from this paper have
important significance for analyzing and predicting the slope failure on the other slope surface have similar properties.

Key words: flycam, Geoslope/W, slope failure, safety factor, 3B highway