ANALISIS PENGARUH VARIASI PROFIL DINDING PENAHAN SHEET PILE TERHADAP STABILITAS TANAH LEMPUNG MENGGUNAKAN PLAXIS 2D

Doroti Krislei Laia; Lolom Evalita Hutabarat

doi:10.33541/cen.v7i1.8614

Authors

Doroti Krislei Laia Universitas Kristen Indonesia (UKI)
Lolom Evalita Hutabarat Civil Engineering Department Universitas Kristen Indonesia (UKI) Jakarta https://orcid.org/0000-0002-7272-6113

DOI:

https://doi.org/10.33541/cen.v7i1.8614

Keywords:

Sheetpile, deformation, safety factor, soft clay, Plaxis 2D

Abstract

Deep urban excavations with clay and groundwater layers face a high risk of soil transport and wall movement. Using PLAXIS 2D finite element modeling with the Hardening Soil framework, this study analyzed the performance of ESC-HRZ sheet pile profiles (9–17 mm thick) at depths of 9 m, 12 m, and 14 m. At 9 m, each sheet pile profile experienced toe kick-out as the wall failed to embed deep enough into the stiff soil layer. Increasing the wall thickness to 17 mm improved stiffness, but the cantilever arrangement still failed to keep the movement below the required limit (<0.5% of the limit). Extending the embedment to 14 m into the stiff mud layer and installing two levels of anchors allowed even the thinnest 9 mm profiles to outperform the thickest unsupported wall. The optimized anchor-plus-depth configuration reduced the total steel weight by 54%, kept the wall displacement low to 0.46%, and maintained a safety factor of 2.15. Deep embedment depths and strong structural support control ground movement much more effectively than simply increasing the thickness or weight of the steel wall. Simulation results show that all combinations of depth profiles yield a safety factor above the minimum required limit of 1.5. The addition of anchors has been shown to increase the safety factor and reduce the quality, although the model without anchors also shows adequate stability. Profiles with higher stiffness provide better performance in maintaining system stability. The results of this study can be used as a reference in selecting sheet pile designs for construction on clay soils, taking into account both structural efficiency and geotechnical safety.

Keywords: Sheet Pile, deformasi, faktor keamanan, tanah lempung, Plaxis 2D

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