Jembatan Kali Jubang pada Tol Pejagan Brebes Timur mempunyai elevasi oprit timbunan rencana sebesar 7m. Tanah dasar pada area sekitar Kali Jubang adalah tanah lempung lunak kecoklatan. Tanah lempung lunak mempunyai nilai daya dukung yang rendah dan kemampuan mampat yang tinggi. Hal ini mengakibatkan kemungkinan terjadinya kelongsorsan, patahnya plat injak jembatan, serta penurunan yang tidak seragam yang mengakibatkan perkerasan yang bergelombang dan dapat membahayakan pengguna jalan. Oleh sebab itu dibutuhkan perencanaan perkuatan pada oprit jembatan Kali jubang untuk menganggulangi hal tersebut. Perencanaan perkuatan direncanakan menggunakan geotekstil dengan kuat tarik (Tult) =150 kN/m2. Dari hasil analisis didapatkan nilai tinggi timbunan awal (Hinitial) yaitu sebesar 8,9m untuk mengantisipasi terjadinya pernuruan konsolidasi sebesar 1,9m. Perencanaan geotekstil di rencanakan sebanyak 35 lapisan dengan menggunakan tebal lapisan yaitu 0,25m, panjang lipatan atas sebesar 1,0m, serta panjang yang sesuai lebar badan jalan untuk setiap lapisan.
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 Pejagan-Pemalang toll road which is a Section II project was designed at different embankment heights on soft soil subgrade. The process involved investigating the slope stability of these embankments through the determination of the safety factor. This can be achieved using different methods such as the limit equilibrium method (LEM) and the finite element method (FEM) which are considered the standard approaches. However, the presentation of different numerous results for the safety factors (SF) in landslide calculations usually makes it difficult for the engineer to understand some uncertain conditions. Therefore, this study aims to determine the safety factors using LEM and FEM approaches at different conditions. The soil subgrade used was in SPT and three models of the properties were obtained. Moreover, a Geo-Studio program with Slope-W analysis was applied using the Morgenstern-Price for the LEM and PLAXIS for the FEM. The height was varied at 2 to 8m with the slope H: V at 1:1, 1:1.5, and 1:2. The simulation was conducted at three different levels of groundwater. The results showed that the height, embankment geometry, and groundwater levels were affected in the SF analysis using the two methods. It was also discovered in all categories that higher embankments had smaller SF while the higher angle of slope produced a higher SF. Furthermore, the properties of the soft soil were observed to have influenced the SF result as indicated by the narrow difference in the correlation between the embankment height and SF. The results of the LEM and FEM were also compared and the observations were explained. The findings of this study are expected to serve as a guide for engineers, especially those in road toll projects, to determine the optimum model needed to predict slope failure in embankments for toll roads.
Birobuli is located in South Palu, which has highly vulnerable to earthquakes. One of the phenomena that usually occur after an earthquake is liquefaction which causes significant damage and loss of life. Furthermore, all the infrastructure is required to analyze the effect of external load and potential hazards. This research aims to investigate the liquefaction potential in Birobuli, South Palu. The method was divided into two categories: grain size distribution analysis and empirical formula based on CPT data. The result presented a similar trend in grain size analysis which consist of all the range in the potential to liquefaction, while the CPT result describes the same meaning. The CPT 1 result showed SF<1 between 0-5m and 9-11m, while CPT 2 had fluctuating data in ranges between 0.18-2.00 in 0-4m, SF under 2 in 6-8m and 9-11m. This study was expected to provide information for local government as disaster mitigation for Birobuli Area.
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