The Effect of Slope Angle on the Stability of Course Subbase Employed Soil on Toll Road Project Construction Binjai – Pangkalan Brandan

DOI

10.2991/978-94-6239-781-1_8How to use a DOI?

Keywords

Bishop; Geostudio; Safety Factor; Slope Stability; Slope Angle

Abstract

The construction of the Binjai - Pangkalan Brandan toll road has a variety of embankments with different heights and slope angles. The slope angle is one of the things that has an influence on the failure of a slope (Budhu, 2011). The study aims to determine how much influence the slope angle has on the stability of embankment slopes with angle variations of 15º, 25º, 45º and 60º before and after loading. The analysis was conducted using manual bishop method and geostudio program. The results of manual bishop and geostudio stability analysis before loading obtained safety factor (SF) values of 1.80 and 1.79, while the SF value of the slope after loading is 1.46 and 1.52. In the analysis using the geostudio program with variations in embankment 15 ͦ, 25 ͦ, 45 ͦ and 60 ͦ before loading obtained SF values of 3.16, 2.16, 1.43 and 1.09, while the SF value after loading is 2.60, 1.79, 1.15 and 0.89. From the results of the study it can be concluded that the variation of slope angle affects the SF value The stability of a slope decreases with the greater the angle. The more gentle a slope, the greater the stability value. Conversely, the steeper the slope, the less the stability value under the same soil parameter conditions.

Copyright

© 2026 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Lis Ayu Widari
AU  - Yovi Chandra
AU  - Nanda Savira Ersa
AU  - Abdul Jalil
AU  - T. Mudi Hafli
AU  - Ikmal Fasha Lubis
PY  - 2026
DA  - 2026/09/30
TI  - The Effect of Slope Angle on the Stability of Course Subbase Employed Soil on Toll Road Project Construction Binjai – Pangkalan Brandan
BT  - Proceedings of the 3rd International Conference on Applied Engineering, Sciences, Technology and Innovation (AESTI 2025)
PB  - Atlantis Press
SP  - 54
EP  - 71
SN  - 2352-5401
UR  - https://doi.org/10.2991/978-94-6239-781-1_8
DO  - 10.2991/978-94-6239-781-1_8
ID  - Widari2026
ER  -