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.
Surakarta is a relatively small yet is categorized as a densely populated city. There are a lot of types of public buildings, such as hospitals, supermarkets, government infrastructures, and school buildings. The city has more than 1100 school buildings threatened by many potential earthquakes. The possibility of an earthquake hitting Surakarta may be fatal and cause significant losses of buildings. However, studies on seismic hazard of the city are still very rare and need more attention. This paper presents a recent study on the seismic loss assessment of school building in Surakarta. The survey has been conducted by a team to visit, check, record and document all the required information to obtain exposure, combined with the information from google map application, while the seismic hazard analysis was carried out using the event-based stochastic method. An open-source application, OpenQuake, was utilized to assess the seismic loss and the results were presented here. The elaborated analysis is presented concluding that the exposure and vulnerability of school buildings are very important factors to determine a risk of loss. It indicates that the wooden school building contributes a highest risk of loss, whereas the confined masonry ones give a lowest risk. Among the whole sub districts in Surakarta, it is assessed that Laweyan suffers the biggest seismic loss of 2.36 million USD due to 500 years return period earthquake and 5.39 million USD due to 2500 years return period earthquake. These results of this study are valuable information for government in order to overcome disaster mitigation policy of Surakarta.
<p>Pertumbuhan ekonomi dan penduduk di Indonesia mengakibatkan kebutuhan listrik yang meningkat. Salah satu cara mengatasi kebutuhan listrik yang terus meningkat adalah dengan membangun pembangkit listrik tenaga mikro hidro. Mesin PLTMH Ketika digunakan akan mengalami getaran yang dapat membahayakan mesin itu sendiri maupun lingkungan disekitarnya. Sehingga dibutuhkan pondasi mesin yang dapat meredam getaran mesin dan aman terhadap respon statis mesin PLTMH. Penelitian ini bertujuan untuk mengetahui bagaimana pengaruh dimensi pondasi dan kapasitas mesin terhadap respon statis pondasi mesin. Dengan variasi panjang dan lebar pondasi sebesar 0,5 m. Untuk variasi mesin yang digunakan adalah mesin dengan kapasitas 1000, 1500, dan 1200 rpm. Metode analisa yang digunakan adalah metode meyerhof. Hasil yang didapatkan dari penelitian ini adalah semakin besar panjang pondasi, maka akan terjadi penurunan daya dukung sebesar 6,67%, sedangkan semakin besar luas penampang pondasi maka akan terjadi penurunan tegangan statis sebesar 3% untuk semua mesin.</p>
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