Civil Engineering and Architecture 11(4): 2219-2230, 2023 http://www.hrpub.org DOI: 10.13189/cea.2023.110439 An Experimental Study of Bearing Capacity and Slope Stability of Residual Slope Model with Pile Reinforcement Eko Indah Susanti 1,* , As’ad Munawir 2 , Yulvi Zaika 2 , Sri Murni Dewi 2 1 Doctoral Program, Brawijaya University, Indonesia 2 Department of Civil Engineering, Brawijaya University, Indonesia Received February 2, 2023; Revised April 3, 2023; Accepted May 9, 2023 Cite This Paper in the Following Citation Styles (a): [1] Eko Indah Susanti, As’ad Munawir, Yulvi Zaika, Sri Murni Dewi , "An Experimental Study of Bearing Capacity and Slope Stability of Residual Slope Model with Pile Reinforcement," Civil Engineering and Architecture, Vol. 11, No. 4, pp. 2219 - 2230, 2023. DOI: 10.13189/cea.2023.110439. (b): Eko Indah Susanti, As’ad Munawir, Yulvi Zaika, Sri Murni Dewi (2023). An Experimental Study of Bearing Capacity and Slope Stability of Residual Slope Model with Pile Reinforcement. Civil Engineering and Architecture, 11(4), 2219 - 2230. DOI: 10.13189/cea.2023.110439. Copyright©2023 by authors, all rights reserved. Authors agree that this article remains permanently open access under the terms of the Creative Commons Attribution License 4.0 International License Abstract Based on its geographical location, most of Indonesia's territory consists of residual soil. Residual soil on slopes has been a problem that often occurs and causes landslides. We can use various efforts to prevent landslides and overcome other issues on slopes, especially residual soil, by providing reinforcement. In this study, we can increase the strength of the slopes to be more stable by providing pile reinforcement to improve the safety of the slopes. First, we observed a scaled slope model with and without pile reinforcement. Residual slope modeling was carried out using a test box with a slope inclination of 37° and using a composite concrete pile as a model for pile reinforcement. Test models with different diameters (2.54 cm, 3.175 cm, and 3.81 cm) and the pile spacing were varied (7.5 cm, 10 cm, and 12.5 cm). This test was performed using an experimental model in the laboratory aimed at understanding the failure mechanism or failure of the slope. We identified the maximum failure load value for the slope to resist sliding. Problems in the laboratory were analyzed using the finite element method by changing the form of 3D slope modeling to 2D modeling. Then, we compared the experimental results in the laboratory with the finite element analysis method. Based on the FE Method test results, the SF of slopes reinforced with single-row experienced a safety factor improvement of 17.621 % in FEM (2D) compared to slopes modeled without reinforcement. The most significant bearing capacity and SF value were found in the diameter of 3.175 cm and a distance of 10 cm. The effect of diameter and spacing between piles on slope stability is when the pile diameter increases, the pile spacing becomes smaller, and the critical slip surface also becomes deeper until a specific diameter and distance are reached. This condition causes the slope to become stable. In addition, the study result showed that reinforced slopes are prone to failure of the rotational slope. Keywords Pile Reinforcement, Residual Slope Model, Bearing Capacity, Safety Factor, Finite Element Method 1. Introduction Due to its geographical location, most of Indonesia's territory has residual soil. Residual soil is the result of the physical and chemical weathering of rocks. The increasing development activity has caused many hills to change their function into housing, agriculture, plantations, and roads, thus triggering the conversion of land functions in unstable slope areas due to increasingly limited land. This situation can cause the soil to become unstable and endanger people's lives. Slope stability generally depends on the interaction