Slope stability analysis in various Terraces model (case study: Sendangmulyo, Tirtomulyo District, Wonogiri Regency)

Abstract

Wonogiri has various contours. Steep slopes dominate some areas. Hence it has a high possibility to occur landslides. There are still a lot of people living under the slopes. Therefore, this research is essential for disaster mitigation purposes. The study aims to know how the value of the slope safety factor changes with construction terraces design. The research was conducted by collecting secondary data and improving the Terraces construction carried out. The data was analyzed in the limit equilibrium method to provide conditions before and after the rain. The models were tried with several Terraces variations on the slope to obtain the most optimal design. The results used a simplified Bishop method. The design of terraces on the slopes of Sendangmulyo Wonogiri Village shows that the SF value increase is only for the conditions before a rain. In contrast, the states after the rain do not yield a safety condition. The SF value increases if the number of steps increases, whereas the more step height increases, the less the SF value will be.

The distribution of soil fertility index and its interaction with earthworms density under organic, semi-organic, and inorganic rice fields

“…This result can be caused by the rice fields' terracing system on sloping area (>0%). According to Surjandari et al (2021), terracing is a form of conservation construction as an effort to reduce the slope. The purpose of terraces is to minimize surface runoff, the erosion of soil, and increase water absorption.…”

Slope Reinforcement Design for Balikpapan-Samarinda Toll Road Landslide Section 28+000 To 28+100.

“…Balikpapan -Samarinda Toll Road Project was constructed in terraces design with 18m height slopes in stationing 28+000 to 28+100, preventing the landslide. Although this strategy sometimes produces safety conditions [1], [2], the design offers the opposite situation on this site. This section presents several cracks in the slope body after heavy rainfall, which leads to mass material movement downhill.…”