The value of soaked-CBR in subgrade soil is very important in the highway pavement thickness design [1]. If the soaked-CBR value of the subgrade does not meet the requirements, it is necessary to improve the soil by blasting with a better material. This is done to prevent damage to the road. Damage to the pavement surface may also cause damage to the subgrade. Alternatively, the damage to the pavement surface begins with damage on the subgrade. If the subgrade decreases in its power - caused by repetitive vehicle loads, otherwise known as repetition vehicle load, then it can collapse the foundation layer, in which - then continues on the surface damage. Based on the phenomenon, this research is conducted to know the change of soaked-CBR value on subgrade soil due to water logging and repetition of vehicle load passing. The result shows that the soaked-CBR value will increase along with the number of vehicles passing up to 25x passings, then down to 50x passings which is the lowest value of all load variations. After 50x passings, CBR value will increase slightly up to 250x passings which then decrease until the end of the research.
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.
Sungai Badeng yang berlokasi di Kecamatan Songgon Kabupaten Banyuwangi mempunyai debit yang sering meluap sehingga menyebabkan rusaknya dinding penahan tanah dan terkikisnya lereng tepi sungai area Dam Badeng. Hal ini menjadi permasalahan bagi warga sekitar karena pemanfaatan air menjadi kurang maksimal dan dapat meningkatan resiko terjadinya banjir didaerah hilir sungai. Untuk mencegah agar tidak terjadi kelongsoran pada tepi sungai, maka dilakukan analisis stabilitas lereng dengan menggunakan dinding penahan tanah tipe gravitasi yang dapat menahan gaya guling, gaya geser, dan aman terhadap daya dukung serta memperhatikan drawdown. Analisis drawdown dimodelkan selama 20 jam pada kondisi awal muka air sungai surut menuju banjir lalu kembali pada kondisi semula. Pemodelan dilakukan dengan program bantu Geoslope studio. Hasil analisis stabilitas gravity wall terhadap drawdown dinyatakan aman. Saat muka air sungai semakin tinggi, maka nilai safety factor lereng akan bertambah. Dan saat muka air sungai semakin turun, maka nilai safety factor lereng akan berkurang. Hal ini terjadi karena dipengaruhi oleh naik dan turunnya nilai tekanan pasif yang diberikan air terhadap lereng. Kondisi safety factor paling kritis terjadi saat kondisi surut karena masih adanya residu air sungai yang masuk kedalam pori-pori tanah. Analisis stabilitas terhadap gaya guling, gaya geser, dan aman terhadap daya dukung juga dinyatakan aman.
An unstable slope is identical to the low value of their factor of safety (FS). Slope with low FS are in critical condition, which can cause landslides. On the other hand, the presence of triggering factor such as rain and human activities will increase the percentage of landslide. It has happened in Dompyong village. The Rocscience Slide Program, used to analyze slope stability in Dompyong village based on the simplified – bishop method. Based on the analysis, the FS value of the initial condition of slope is 0,85. Therefore, the slope is in critical condition because the FS value is less than 1,07. A combination method of retaining wall and micropiles is used to strengthen slope stability. This method can increase the FS value to 1,370. The slope is in a stable condition relatively because the FS value is more than 1,25.
In planning a highway bridge girder using prestressed concrete, it must pay attention to two design categories, namely strength and service. Problems have arisen since the existence of earthquake resistance regulations for road bridges, so planners must calculate the amount of deflection and stress that occurs in the upper structure due to earthquake loads, which must be smaller than the deflection and voltage permits required by regulations. All of that was also greatly influenced by the accuracy of the predicted loss losses for prestressed concrete girders. The purpose of this study was to conduct a study which could be a solution for how to actually treat a good design, for the I-Girder design of prestressed concrete used as a highway bridge girder in the event of inaccurate prediction of loss of pressure during an earthquake, resulting in two design categories strength and service ability can be considered all well. The methodology of this study is to make as a starting point the prestressed concrete I girder whose dimensions are capable of being a highway bridge girder with a span of 30 m to 40 meters with standard loading for loading BM 100. For span bridges that have 100% prediction accuracy, use as a basic benchmark of deflection and stress values that occur for the type of combination of loads that have earthquake loads, then with the same span, varied values of inaccurate predictions lose pre-stress and analyzed deflection and stress values that occur for types of load combinations that have earthquake loads varied earthquake regions 1,2, 3 and 4, for medium soil types. The results of the study show that the greater the percentage of inaccurate prediction of loss of pressure, the greater the deviation ratio of deviations both deflection, upper fiber stress and lower fiber stress occur in the field. Which, if the prediction of losing pre-pressures is smaller than the actual one, then the level of the deviation ratio of the allowable deviation increases as well as vice versa. Also, predicting pre-suppression voltage loss that is located on the side greater than the actual loss of pressure that occurs will be on the part of the party that is harmful to the ability of service and the permissible power, when an earthquake occurs.
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