The Santer Riverbank which is located in Panggul Melati Hamlet, Kepanjen Village, Gumukmas District, Jember Regency, East Java is still used by the community for agricultural land. This research was conducted to create safe agricultural land for the community. Landslides on this riverbank often occur because it is located on the edge of the river and has a steep slope. In the observation in 2022, there is a collapsed riverbank approximately 20 meters in front of the river embankment. To prevent a longer landslide area, the slopes on the river border are optimized so that residents can still use the land safely. The selected reinforcement is made based on the geometric conditions and the results of the SF value from modeling the existing conditions using the Geostudio program. Appropriate reinforcement based on geometric conditions and SF values is a balancing method. close to the counterweight method, the geometric conditions are more optimal with the SF value increasing from 1.099 to 1.623
The construction of the Grand Dharmahusada Lagoon Apartment on Dharmahusada Mas, Mulyorejo, had a detrimental effect on the homes of local residents. Damage that occurs in general is cracks on the walls of the house ranging. Reinforcement using Diaphragm Wall and Secant Pile are designed for the Grand Dharmahusada Lagoon Surabaya project. Diaphragm wall and secant pile is a type of retaining wall that has the same advantages, the construction not noisy in workmanship, thickness and depth that can be adjusted as needed. The purpose of this thesis is to know and compare effectiveness of each plan. The results obtained in the calculation are material dimensions, wall depth, and maximum deformation. The Diaphragm wall has a thickness of 2.7 meters and a depth of 31 meters with a maximum deformation of 4.98 cm. In secant pile, the diameter of the pile is 1.2 meters with a depth of 31 meters and a maximum deformation of 4.93 cm. Based on the results of the planning comparison 2 of this method which includes maximum deformation, depth of excavation, wall thickness and estimated cost, planning was chosen using secant pile as a retaining wall. ABSTRAK Pembangunan Apartemen Grand Dharmahusada Lagoon di Jalan Dharmahusada Mas, Mulyorejo, membawa dampak buruk bagi rumah warga sekitar. Kerusakan yang terjadi pada umumnya adalah retak pada tembok rumah. Perencanaan perkuatan pada proyek Grand Dharmahusada Lagoon Surabaya menggunakan Diaphragm wall dan secant pile. Diaphragm wall dan secant pile merupakan jenis dinding penahan tanah memiliki keunggulan yang sama yaitu tidak bising dalam pengerjaan, ketebalan dan kedalaman yang dapat diatur sesuai kebutuhan. Tujuan perbandingan perencanaan dalam skripsi ini untuk mengetahui dan membandingkan keefektifan dari masing – masing perencanaan.. Hasil yang didapatkan pada perhitungan adalah dimensi material, kedalaman dinding, dan deformasi maksimum. Pada Diaphragm wall didapatkan ketebalan 2,7 meter dan kedalaman 31 meter dengan deformasi maksimum 4,98 cm. Pada secant pile didapatkan diameter pile sebesar 1,2 meter dengan kedalaman 31 meter dan deformasi maksimum 4,93 cm. Berdasarkan hasil perbandingan perencanaan 2 metode ini yang meliputi deformasi maksimum, kedalaman galian, ketebalan dinding dan estimasi biaya, dipilih perencanaan dengan menggunakan secant pile sebagai dinding penahan tanah.
A Landslide is the movement of soil mass or rock constituents down the slope due to disturbance of soil stability. One of the factors that affect soil stability is the rainy season as happened in Sumberwuluh Village, Candipuro District, Lumajang Regency. The alternative used to stabilize the slope is by changing the slope geometry, then adding geoframe reinforcement. This study aims to determine the value of the factor of safety (SF) of unreinforced slopes, after changing the slope geometry, and after being given geoframe reinforcement. The method used in analyzing slope stability is the Ordinary/Fellenius method. The results of the calculation of slope stability without reinforcement using the Rocscience Slide software obtained a SF of 0.719, while the manual calculation obtained a SF of 0.7191. The two values of the safety factor are less than 1.25, which means that landslides often occur. The results of the calculation of slope stability after changing the geometry of the slopes obtained a SF of 0.828 where the value is less than 1.25 which means that landslides often occur. The slopes that have been changed geometry are added with geoframe reinforcement. The results of the calculation of slope stability using geoframe reinforcement obtained a SF of 1.315 where the value is more than 1.25 which means that landslides are rare or slope in a safe condition.
Split Mastic Asphalt (SMA) as a solution to reduce the problem of damage to the road pavement layers before the end of it’s service period due to high traffic loads. Cellulose fiber is needed as an asphalt stabilizer. The study was conducted with a pure experimental method to determine the effect of cellulose fiber on the marshall performance of Split Mastic Asphalt Mixtures (SMA). This study used a mixture of SMA by using five variations of the addition of natural cellulose fibers from corn cobs that is 0.15%; 0.30%; 0.45%; 0.6%; 0.75%. The results showed that the corn cob cellulose fiber determines the characteristics of Marshall namely weakness, flow, VIM, VMA,. But not all levels of varieties meet specifications. For optimum levels of cellulose fiber added to the SMA mixture, the levels of 0.15% to 0.3% were chosen, because in that scale the increase in strength performance was supported by all other characteristics that passed the 2018 Bina Marga specifications. Split Mastic Asphalt (SMA) sebagai solusi untuk mengurangi permasalahan kerusakan lapisan perkerasan jalan sebelum berakhirnya masa layanannya akibat beban lalu lintas yang tinggi. Serat selulosa diperlukan sebagai material aditif penstabil aspal. Penelitian dilakukan dengan metode experimental murni dengan tujuan mengetahui pengaruh serat selulosa terhadap kinerja marshall. Penelitian ini digunakan campuran SMA dengan menggunakan 5 variasi penambahan serat selulosa alami dari tongkol jagung yaitu 0,15%; 0,30%; 0,45%; 0,6%; 0,75%. Hasil penelitian menunjukkan bahwa serat selulosa tongkol jagung berpengaruh pada karakteristik marshall yaitu stabilitas, flow, VIM, VMA,. Namun tidak semua kadar varians serat selulosa memenuhi spesifikasi. Varians penambahan serat selulosa yang memenuhi spesifikasi karakteristik marshall adalah kadar 0,15% sampai dengan 0,45%. Untuk kadar optimum serat selulosa yang ditambahkan pada campuran SMA dipilih kadar 0,15% sampai dengan 0,3%, karena pada range tersebut terjadi peningkatan kinerja kekuatan yang terbaik, didukung seluruh karakteristik lainnya lolos spesifikasi Bina Marga tahun 2018.
The road pavement structure has a fillercommonly referred to as a filler. Filler (filler) is one of the materials that has an important function, namely as a cavity filler from the asphalt mixture. This research is to see the effect of adding wood charcoal filler content in AC-WC mixture and HRS-WC mixture with variations in the addition of wood charcoal by 0%; 0.5%; 1%; 1.5%; 2% based on total mixture. Examination of aggregate and asphalt was carried out to get the optimum level of asphalt, the optimum value of asphalt AC-WC was 5.30% and for a mixture of HRS-WC 7.89%. The AC-WC mixture obtained the Marshall Test value, obtained the optimum stability value of 1511.9 kg at the addition of 0% filler and decreased with the addition of 0.5%, 1%, 1.5%, 2%. While the HRS-WC mixture also obtained the Marshall Test value obtained optimum stability value of 1899.17 kg at 0% filler addition anddecreases at the addition of 0.5%, 1%, 1.5%, 2%.
The use of the preloading method, which combined with PVD, is now a common method of soil improvement that proved effective in increasing bearing capacity and reducing settlement on soft soil ground types like former rice fields. In order to reach an optimum effectiveness of soil improvement, an evaluation of the settlement should be done by reviewing the performance of soil improvement along with geotechnical instruments installed in the field. In this study, the back analysis method is used to determine the soil design parameters that are following the actual conditions in the field. The results obtained from the evaluation of settlement conducted is the difference between settlement calculation theoretically before the improvement of soil with the available field data of monitoring Settlement Plate. An average percentage of 118% was obtained from the calculation. In contrast, an average percentage of 2.87% was obtained as the difference between the final settlement prediction of Asaoka's with actual settlements based on Settlement Plate readings data in the field. The parameters of the soil results from the back analysis gave new values with each of the average of Ch= 0.02936; Cc= 0.27313; kv= 0.00005 m/day; and mv= 0.00064m2/kN. The difference between theoretical settlement recalculated using the soil parameter of the back analysis method with the actual settlement based on monitoring of Settlement Plate gave an average percentage of 12.66%. Metode Preloading yang dikombinasikan dengan PVD merupakan salah satu metode perbaikan tanah yang terbukti efektif dalam meningkatkan daya dukung tanah dan mengurangi settlement pada tanah jenis lunak seperti tanah bekas sawah. Agar perbaikan tanah yang dilakukan memiliki efektifitas optimum, perlu adanya evaluasi terhadap settlement yang terjadi dengan meninjau kinerja perbaikan tanah beserta instrumeninstrumen geoteknik yang terpasang di lapangan. Selain itu, dilakukan Metode Analisa Balik untuk mengetahui parameter desain tanah yang sesuai dengan keadaan sesungguhnya di lapangan. Hasil yang didapatkan dari evaluasi settlement yang dilakukan adalah selisih settlement secara teoritis sebelum adanya perbaikan tanah dengan settlement berdasarkan monitoring Settlement Plate di lapangan dalam persentase rata-rata sebesar 118%, sedangkan selisih antara final settlement prediksi Asaoka dengan settlement akhir berdasarkan monitoring Settlement Plate di lapangan mendapatkan persentase rata-rata sebesar 2,15%. Parameter-parameter tanah hasil dari analisa balik memiliki nilai baru dengan masing-masing rata-rata sebesar Ch= 0,02936; Cc= 0,27313; kv= 0,00005 m/hari; dan mv= 0,00064m2 /kN. Sedangkan untuk selisih antara settlement secara teoritis yang dihitung kembali menggunakan parameter tanah hasil analisa balik dengan settlement aktual berdasarkan data bacaan Settlement Plate mendapatkan persentase rata-rata sebesar 12,66%.
The northern coastal areas of Java such as Gresik and surrounding areas have a soil structure of alluvium consisting of gravel / coral, sand, clay soil and shells. Soil basic conditions are soft enough to cause land subsidence (settlement). The need for rapid construction causes the urban areas to become less and more for development land. This requires the improvement of soft soil to be used as a building site. As for the method to be done in this planning using a combination of preloading and PVD methods to accelerate the process of land degradation. Based on the planning result, the total height of embankment (preloading) is 3.5 m and the planning time lasted 4 months. Soft soil improvement is done up to 25 m depth with PVD design using triangle pattern and space 1.3 m. The 95% consolidation decrease due to the load of embankment caused the soil to fall as deep as 1,928 m. In this planning use modeling Plaxis 8.6 2D and the resulting yield of soil is 1,990 m. Wilayah pesisir pantai utara Jawa seperti daerah Gresik dan sekitarnya mempunyai struktur tanah berupa alluvium yang terdiri dari batu kerikil/koral, pasir, tanah lempung dan pecahan kulit kerang. Kondisi tanah dasar yang cukup lunak menyebabkan terjadinya penurunan tanah (settlement). Adanya kebutuhan konstruksi yang semakin pesat menyebabkan wilayah perkotaan menjadi semakin sedikit untuk dijadikan lahan pembangunan. Hal ini mengharuskan dilakukannya upaya perbaikan tanah lunak agar bisa dijadikan lahan bangunan nantinya. Adapun pada metode yang akan dilakukan pada perencanaan ini menggunakan kombinasi metode preloading dan PVD untuk mempercepat proses penurunan tanah. Berdasarkan hasil perencanaan didapatkan total tinggi timbunan (preloading) adalah 3,5 m dan waktu perencanaan berlangsung 4 bulan. Perbaikan tanah lunak dilakukan sampai dengan kedalaman 25 m dengan desain PVD menggunakan pola segitiga dan spasi 1,3 m. Penurunan konsolidasi 95% akibat beban timbunan menyebabkan tanah turun sedalam 1,928 m. Pada perencanaan ini menggunakan pemodelan Plaxis 8.6 2D dan hasil penurunan tanah yang dihasilkan adalah sedalam 1,990 m.
CBR (California Bearing Ratio) data is used to find out the level of subgrade density, so that a safe pavement thickness can be planned. The calculation of the CBR (California Bearing Ratio) can be done by testing CBR laboratory and DCP. CBR results have a high effect on the surface layer, so that the layer becomes thinner. This condition, if converted to the working price, will be more affordable and efficient. Therefore, this study aims to compare the results of laboratory CBR and Field Cbr (Dcp) to the thickness of flexible pavements in the Development of Trans South-South Java Road Project (TRSS) Lot 8 Jarit - Puger. The method used is Bina Marga Pd T-01-2002-B. Secondary data obtained by weigh bridges and service providers, namely PT. Brantas Abipraya (Persero). Field CBR value using DCP tool is 25.19% while Laboratory CBR value is 21.616%. The results of pavement thickness using Field CBR values for UR 10 years are D1 7.5 cm, D2 10cm, for UR 20 years D1 10 cm, D2 11 cm, for UR 30 years D1 11 cm, D2 12 cm, and for UR 40 years obtained D1 13 cm, D2 14 cm. The greater the CBR value, the thinner the pavement thickness.
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