Parametric Study of the Effect of Ground Anchor on Deep Excavation Stability

https://doi.org/10.22146/jcef.47514

Aditya Putra Pratama(1*), Hary Christady Hardyatmo(2), Fikri Faris(3)

(1) Geotechnical, Department of Civil and Environmental Engineering Faculty of Engineering, Gadjah Mada University, Yogyakarta
(2) Department of Civil and Environmental Engineering Faculty of Engineering, Gadjah Mada University, Yogyakarta
(3) Department of Civil and Environmental Engineering Faculty of Engineering, Gadjah Mada University, Yogyakarta
(*) Corresponding Author

Abstract


Apartment construction is mostly carried out by including deep excavation works. However, excavation causes land instability; hence, the work needs to be done by a particular handler. In some cases, deep excavation is carried out on soft soil, which has a very high level of soil instability; therefore, a specific handling method such as ground anchor is required as an alternative. This study aims to conduct parametric research on the effect of using anchors on the stability of deep excavation. First, anchors of various slopes were modelled while varying the number of anchors up to four pieces. From the results of the study, the requirements representing the most efficient use of anchors were selected, and then various anchor bond lengths were modelled. Finally, the effect of applying various magnitudes of prestress forces to the anchor was determined. All of the models were examined to determine the influence on the stability of the deep excavation by observing the horizontal displacement and the forces that occur on the secant pile. From the analysis results, it can be concluded that the most effective slope angle is 0°. The displacement and forces occurred in the secant piles on the use of two, three, or four anchors has not a significant difference. The application of a higher prestress force on the anchor would yield better results as long as it is not exceeding 200 kN. However, in the case of an apartment building’s plans in Surabaya, the optimal anchor usage was found to be the use of two anchors with a 45° slope, 4.5 m for the first (A) and second (B) anchor bond lengths, 15 m free length anchor, 2.5 m vertical anchor distance, 1.2 m horizontal anchor distance, and the application of 200 kN prestress force.


Keywords


Deep excavation; Ground anchor; Secant pile; Parametric study; Prestresses

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References

Alsubal, S., Harahap, I.S.H. and Muhammad Babangida, N., 2017. A Typical Design of Soil Nailing System for Stabilizing a Soil Slope: Case Study. Indian Journal of Science and Technology.

Budania, R. and Arora, D.R.P., 2016. Soil Nailing for Slope Stabilization: An Overview. International Journal of Engineering Science and Computing.

FHWA, 1999. Geothecnical Engineering Circular No. 4 - Ground Anchors and Anchored Systems. Washington. Washington, DC.

Gunawan, I., Surjandari, N.S. and Purwana, Y.M., 2017. The study on length and diameter ratio of nail as preliminary design for slope stabilization. In: Journal of Physics: Conference Series.

Josifovski, J., Gjorgjevski, S. and Jovanovski, M., 2012. Numerical analysis of 20.5 m deep excavation with anchored diaphragm wall. In: Geotechnical Aspects of Underground Construction in Soft Ground - Proceedings of the 7th International Symposium on Geotechnical Aspects of Underground Construction in Soft Ground.

Littlejohn, G.S., 1981. Design Estimation of the Ultimate Load-Holding CAapacity of Ground Anchors. Journal of the Boston Society of Civil Engineers Section, American Society of Civil Engineers.

López, S., Sanhueza, C. and Candia, G., 2017. Anchored Piles in Deep Excavations: A Case Study. 16th World Conference on Earthquake Engineering.

Singh, S. and Shrivastava, A.K., 2017. Effect of Soil Nailing On Stability of Slopes. International Journal for Research in Applied Science & Engineering Technology (IJRASET).

Testana Engineering, 2015. Laporan Penyelidikan Geoteknik - Proyek Grand Dharmahusada Lagoon. Surabaya.

Wang and et al, 2016. Concept and characters of deep excavation groups in urban underground space development. The 15th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering.

Zumrawi, M.M.E. and El-Amin, A., 2016. Importance of Deep Excavation Support and Its Influence on Adjacent Buildings. 7th Annual Conference for Postgraduate Studies and Scientific Research.



DOI: https://doi.org/10.22146/jcef.47514

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