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"This paper deals with the development of the geotechnical database of Indonesia and its application in providing and managing data in the form of design parameters for planning a subway tunnel that will be constructed in Jakarta. The engineering aspects of the tunnel project site are also considered with regard to operational safety during the tunneling."

"Kapal pelat datar merupakan salah satu bentuk kapal alternatif yang dapat memberikan kemudahan dalam proses perakitan. Namun, kapal pelat datar memiliki tahanan lebih tinggi dibandingkan kapal berbentuk streamline, maka diperlukan suatu modifikasi untuk mengurangi tahanan tersebut dengan cara meningkatkan kinerja baling-baling terhadap daya dorong. Cara tersebut adalah dengan menggunakan water tunnel yang dilengkapi pengarah aliran air. Tujuan penelitian ini adalah untuk meningkatkan efektifitas propulsi kapal yang akan berpengaruh terhadap kecepatan kapal. Metode penelitian ini dilakukan dengan mengalirkan daya listrik ke dinamo motor kapal model dan menggunakan stopwatch digital untuk mendapatkan waktu tempuh saat melakukan uji tarik kapal. Hasil dari pengujian menunjukkan bahwa besarnya aliran yang terarah masuk ke baling-baling efektif meningkatkan daya dorong baling-baling, sehingga kenaikan kecepatan kapal dapat dicapai.

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Flat plate ship is one of alternative ship that can provide convenience in the assembly process. However, Flat plate ship has a higher resistance than the streamlined shape of the ship. So a modification is needed to reduce resistance by improving performance of propeller to thrust. The way is by using a water tunnel with added water flow direction. The purpose of this research is to improve the effectiveness of ship propulsion that will affect the speed of the ship. The research method is done by passing electrical power to the dynamo model boat motor and use a digital stopwatch to obtain the travel time during the test. Results of testing showed that the amount of flow directed into the propeller effective increasing the propeller thrust, so the increase of velocity in boat can be reach."

"This book presents articles covering a wide spectrum of topics in geotechnical engineering, including properties of soils, unsaturated soil mechanics, ground improvement, liquefaction and seismic studies, soil-structure interaction and stability analysis of man-made and natural slopes.The contributing authors are renowned researchers in their respective fields, which include soft ground improvement, seismic response of retaining structure using soil-structure Interaction (SSI) principles, and unsaturated soils. Based on keynote addresses and invited talks presented at the Indian Geotechnical Conference 2016, this book will prove a valuable resource for practicing engineers and researchers in the field of geotechnical engineering."

"This book comprises select proceedings of the annual conference of the Indian Geotechnical Society. The conference brings together research and case histories on various aspects of geotechnical engineering and geoenvironmental engineering. The book presents papers on geotechnical applications and case histories, covering topics such as (i) shallow and deep foundations; (ii) stability of earth and earth retaining structures; (iii) rock engineering, tunneling, and underground constructions; (iv) forensic investigations and case histories; (v) reliability in geotechnical engineering; and (vi) special topics such as offshore geotechnics, remote sensing and GIS, geotechnical education, codes, and standards. The contents of this book will be of interest to researchers and practicing engineers alike."

"Dalam proses mendesain struktur geoteknik, perlu diperhatikan mengenai ketidakpastian parameter kuat geser pada tanah. Ketidakpastian tersebut dapat mempengaruhi stabilitas struktur dan menyebabkan keluarnya biaya berlebih akibat kegagalan yang terjadi. Pada penelitian ini, akan disajikan proses pemilihan struktur galian pada lingkungan perkotaan dengan memperhatikan ketidakpastian parameter tanah yang dihitung menggunakan metode probabilistik. Struktur galian yang akan dipertimbangkan adalah galian lereng terbuka dan galian dengan dinding penahan tipe sheet pile dan secant pile. Proses pemilihan struktur galian menggunakan analisis Expected Monetary Value dengan mempertimbangkan biaya pembebasan lahan, biaya konstruksi, biaya perbaikan akibat terjadi kegagalan, dan kehilangan pendapatan akibat terjadi kegagalan. Hasilnya menunjukkan bahwa dalam proses pengambilan keputusan sangat dipengaruhi oleh faktor biaya pembebasan lahan, diikuti dengan faktor biaya kehilangan pendapatan, biaya konstruksi dan biaya rekonstruksi.

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In the process of designing geotechnical structures, it is important to consider the uncertainty of soil shear strength parameters. This uncertainty can influence the soil structure stability and resulting in unexpected expenses due to structural failure. This research will provide a decision making process to choose which type of slope excavation structure in urban areas by considering the uncertainty of soil parameters using probabilistic method. Slope excavation structures which will be considered are open-cut slopes, excavation with sheet pile and secant pile retaining wall. The decision making process will be calculated by using Expected Monetary Value analysis which considers land acquisition cost, construction cost, reconstruction cost caused by failure and revenue lost caused by failure. The result shows that the biggest cost which affected the decision is the land acquisition cost, followed by revenue lost cost, construction cost, and reconstruction cost."

"ABSTRAKPesatnya pertumbuhan transportasi massal berbasis rel di kota metropolitan diikuti juga dengan fasilitas pendukungnya seperti terowongan bawah tanah. Minimnya paparan terhadap udara bebas di terowongan bawah tanah mendorong diadakannya penelitian lebih jauh mengenai perilaku asap hasil kebakaran yang mempengaruhi perubahan visibilitas. Pada kondisi yang ada, sistem pembuangan asap didukung oleh ventilasi paksa yang secara kualitatif  telah diketahui mampu membuang asap ketika proses evakuasi berlangsung. Penelitian mengenai pengaruh ventilasi natural terhadap visibilitas pada simulasi terowongan bawah tanah berskala laboraturium menjadi menarik untuk dilakukan mengingat adanya kemungkinan kegagalan pada sistem pembuangan asap ketika proses evakuasi berlangsung. Simulasi kebakaran berskala laboraturium dilakukan pada terowongan model berskala 1:16,25 dan simulasi numerik dengan skala 1:16,25 menggunakan software Fire Dynamics Simulation versi 6. Froude Number dijaga konstan pada kedua metode untuk memastikan rasio antara gaya inersia fluida dan gaya beratnya sama dengan keadaan yang sebenarnya sihingga perilaku asap pada skala penuh secara umum dapat diprediksi melalui hasil simulasi berskala laboraturium. Perbedaan kecenderungan penurunan visibilitas antara kedua metode sebagai hasil dari simulasi mengindikasikan adanya kekurangan akurasi dari metode simulasi numerik dalam memprediksi karakteristik penurunan visibilitas terhadap waktu. Metode simulasi numerik secara umum hanya mampu memprediksi nilai akhir dari visibilitas dan apakah visibilitas menurun atau konstan terhadap waktu. Kesimpulan kondisional akhir yang dapat disoroti dari penelitian ini adalah ventilasi natural terbukti mampu mengurangi penurunan visibilitas ketika kebarakan terjadi.

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ABSTRACTThe rapid growth of railway based public transportation in metropolitan city is followed by its supporting facilities such as underground tunnel. The minimum exposure towards ambient air in underground tunnel encourages the further studies about the conflagration smoke behavior which effects visibility change. In the existing situation, the smoke extraction system is supported by forced ventilation which has been qualitatively known to be able in extracting smoke during the evacuation time. The studies about the effect of natural ventilation on visibility in a laboratory scale underground tunnel simulation become interesting to be done due to the possibility of smoke extraction system failure while evacuation is being held. The laboratory scaled conflagration simulation is held at a 1:16,25 scaled tunnel model and numerical simulation using Fire Dynamics Simulation version 6 with 1:16,25 scale. The Froude Number is kept to be constant for both of the methods to ensure the ratio between fluid inertia force and its gravitational weight are similar so the full scaled smoke behavior can be generally predicted by the laboratory scaled result. The different trend in visibility declination among the methods as the result indicates an inaccuracy of the simulation method to predict the visibility declination characteristic by the time. It is only generally able to predict the final value of visibility and whether it is decline or is constant by the time. The final conditional conclusion can be highlighted from this research is natural ventilation is proven to be able to reduce the visibility declination when the conflagration occurs.

 

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"ABSTRAKFor dynamic excitation, it is convenient to idealize homogeneous soil under a base mat by a semi-infinite truncated cone. It is easy to analyze the cone model for vertical and horizontal translation, as well as for rocking and torsional rotation. The accuracy by comparison to rigorous half-space solutions is quite adequate for practical applications. Time-domain computational methods for translational and rotational motions are described in both the stiffness and flexibility formulations and elucidated by examples. The infinite cone is dynamically equivalent to a discrete element representation of the soil, consisting of an interconnection of a small number of masses, springs, and dashpots. As an alternative to the physical-component model, the response may be determined directly by simple recursive numerical procedures. The recursive methods are exact and particularly well suited for hand calculations of short-duration excitations."

"This book presents the development of optimization platform for geotechnical engineering which is one of the key components in smart geotechnics. The book discusses the fundamentals of the optimization algorithm with constitutive models of soils. Helping readers easily understand the optimization algorithm applied in geotechnical engineering, this book first introduces the methodology of the optimization-based parameter identification, and then elaborates the principle of three newly developed efficient optimization algorithms, followed by the ideas of a variety of laboratory tests and formulations of constitutive models. Moving on to the application of optimization methods in geotechnical engineering, this book presents an optimization-based parameter identification platform with a practical and concise interface based on the above theories. The book is intended for undergraduate and graduate-level teaching in soil mechanics and geotechnical engineering and other related engineering specialties. It is also of use to industry practitioners, due to the inclusion of real-world applications, opening the door to advanced courses on both modeling and algorithm development within the industrial engineering and operations research fields."