Case Study Method: Relationship between Fully Softened and Residual Shear Angle and Liquid Limit in Problematic Clay Soil

Kukuh Mahi Sudrajat, Sri Prabandiyani Retno Wardani, Kresno Wikan Sadono — Fri, 26 Dec 2025 00:00:00 +0200

Problem clay soils often experience a significant decrease in shear strength from peak strength to residual strength, which greatly affects slope stability and geotechnical structures. This study examines the empirical relationship between the angle of repose in fully softened and residual conditions and the liquid limit in various types of problem clay soils through a methodological case study approach. This research method is based on the need to comprehend how to operate clay soils under critical conditions, especially on slopes that have experienced movement or are in a remolded condition. The fully softened condition represents the strength of soil that has been loaded to a considerable displacement but has not yet reached the residual condition, while the residual condition represents the minimum strength that can be achieved after a very large displacement. This case study method aims to identify and analyse the mathematical correlation between shear strength parameters (fully softened and residual angles of repose) and the liquid limit as an index of plasticity that can be easily determined in the laboratory. This case study method aims to identify and analyse the mathematical correlation between shear strength parameters (fully softened and residual shear angles) and the liquid limit as an index of plasticity that can be easily determined in the laboratory. The methods used include a comprehensive literature review of previous research, secondary data collection from various geotechnical projects, and statistical analysis to determine trends in the relationship between these parameters. A case study approach was used to validate the empirical correlations found in the literature with local soil conditions. Linear and nonlinear regression analyses were applied to develop prediction equations that can be used in geotechnical engineering practice.

Development of E-Modules Discrete Math Learning Multimedia for Discovery Learning

Fri, 26 Dec 2025 00:00:00 +0200

The purpose of developing learning multimedia for Discrete Mathematics courses based on discovery learning is to provide interactive, in-depth, and interesting learning experiences for students. Through the discovery learning approach, the main goal is to encourage students to be actively involved in the learning process, so that they can develop a deeper understanding of discrete mathematics concepts. Multimedia learning provides opportunities for students to explore these concepts through various media, such as videos, simulations, and direct interaction, which help them internalize the material better. The research subjects were ITB TSIKOM Bali students who took the Discrete Mathematics course in the intermediate semester with a population of 35 students. The method used in multimedia development is MDLC (Multimedia Development Life Cycle) which consists of the stages of Concept, Design, Material Collecting, Assembly, Testing and Distribution. This e-module design applies use case diagrams, activity diagrams, sequence diagrams and storyboards. Testing includes blackbox with the results of all functions in the application running well; the second test of user trials using interviews with limited result is that overall students can accept the application well; the third test is a user trial using a Likert scale questionnaire, and the results of the Likert scale score are analyzed using the feasibility percentage formula with a value of 89.6 declared e-modules very feasible to use as discrete mathematics learning media.

European Journal of Science, Innovation and Technology

Case Study Method: Relationship between Fully Softened and Residual Shear Angle and Liquid Limit in Problematic Clay Soil

Development of E-Modules Discrete Math Learning Multimedia for Discovery Learning