Analysis of Soft Soil Shear Strength on Slopes Stabilized Using Volcanic Ash and Phosphoric Acid

DOI

10.2991/aer.k.211106.045How to use a DOI?

Keywords

Phosphoric_acid; shear_strength; stabilization; soft_soil; volcanic_ash

Abstract

The main problem in construction is the lack of quantities of land to build the infrastructure, such as roads, buildings, dams, etc. Meanwhile, the technical specifications for soil are often not suitable for the requirements for the building base. Soft soil is a problem in construction due to its unsupportive characteristic to be used as a building base. One of the most important soil parameters is the value of soil shear strength. The parameter of shear strength is cohesion (c) and angle of internal friction (ϕ), needed to determine the soil bearing capacity and slope stability. Soil stabilization is the process of adding material into the soil to modify the properties of the original soil to obtain the desired properties. The methodology carried out is laboratory testing, consisting of Index Properties and Engineering Properties of original and stabilized soil. The stabilization material was volcanic ash (VA) mixed with phosphoric acid (PA) by 6%, 8 %, 10% for volcanic ash, and 10% for phosphoric acid. The purpose is to obtain the optimum variation of stabilization, in improving soil parameters, especially from the value of shear strength. The result of this research was decreasing the value of plasticity index of soft soil, reached ±70% from original soil. From UCS test, obtained maximum value on variant 3 (10% VA + 10% PA) which is 1,058 kg/cm², classified as a medium level of consistency. In addition, seen from the value of Triaxial U-U test, there is an increasing of cohesion and angle of internal friction value. From the results, it can be concluded that volcanic ash and phosphoric acid with an ideal composition are effective and can be used as an alternative material for stabilizing soft soil on slope structures.

Copyright

© 2021 The Authors. Published by Atlantis Press International B.V.

Open Access

This is an open access article under the CC BY-NC license.

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TY  - CONF
AU  - R Prajudi
AU  - S Syahril
PY  - 2021
DA  - 2021/11/23
TI  - Analysis of Soft Soil Shear Strength on Slopes Stabilized Using Volcanic Ash and Phosphoric Acid
BT  - Proceedings of the 2nd International Seminar of Science and Applied Technology (ISSAT 2021)
PB  - Atlantis Press
SP  - 284
EP  - 289
SN  - 2352-5401
UR  - https://doi.org/10.2991/aer.k.211106.045
DO  - 10.2991/aer.k.211106.045
ID  - Prajudi2021
ER  -