Slope Failure Status and Analytical Results of Slope Stability from Fracture Orientations. Case Study in 3B Highway in Xuathoa Area, Backan Province, Vietnam

Abstract

This paper presents the slope failure status and analytical results of slope stability by using rock slope engineering of Hoek and Bray (Rock slope engineering. Taylor & Francis Group, London and New York, p 431, [3] along the 3B highway in Xuathoa area, Backan province, Vietnam. The analytical results from 3813 fracture measurements from 33 survey sites have shown that the plane failure, wedge failure and toppling failure can occur on the rock slope surface at most survey locations along the road. Especially, the plane failure phenomenon can occur with the largest percentages: 35.0%, 41.0%, 36.0%, 41.8%, 45.7% belong to the sections in the directions of E–W, N–S and NW–SE at the survey locations: BK-27, BK-30, BK-41, BK-59 and BK-72; the wedge failure phenomenon can occur with the largest percentages: 49.6%, 40.7%, 62.1%, 53.9%, 38.5%, 41.7%, 40.0%, 39.9%, 36.7% belong to the sections in the directions of E–W, N–S and NW–SE at the survey locations: BK-52, BK-53, BK-57, BK-63, BK-66, BK-68, BK-72, BK-75 and BK-80; the toppling failure phenomenon can occur with the largest percentages: 10.9%, 12.7%, 11.6%, 13.7% belong to the sections in the directions of the NW–SE and N–S at the survey locations: BK-79, BK-80, BK-81 and BK-83.