Faculty of Engineering

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Browsing Faculty of Engineering by Author "Agus, Nugroho Soewignjo"

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    PENGARUH WAKTU TERHADAP PENINGKATAN KAPASITAS DUKUNG KELOMPOK TIANG PADA TANAH LUNAK
    (2012-12-03) Wardana, Razaq Arif Cakra; Ferry, Fatnanta; Agus, Nugroho Soewignjo
    Tests by previous researchers have discovered phenomenon increasing significantly of axial capacity foundation on soft soil. In this final project researchers created a model of the group piles in soft soil and given time variations of pile driving. By keeping the soil moisture conditions in order to condition the soil shear strength does not change, it is hoped the results of this study demonstrate and produce an increase in the amount of the axial bearing capacity of pile. The results of direct testing and interpretation of the results showed a significant increase until the end of the age of Pile Driving (68 days). At the age of 68 days, the pile axial capacity increased by an average 50.2% of the age of piling on one day. The study also produced an increase in the time factor (Δ10) that can be used in the empirical formula found by previous researchers.
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    PRAKIRAAN NILAI KUAT GESER TANAH LUNAK BERDASARKAN PENGUJIAN MACKINTOSH PROBE
    (2013-03-30) Rosyida, Hawmar; Ferry, Fatnanta; Agus, Nugroho Soewignjo
    Soil investigations are carried out in the field to get a true geotechnical analysis. Various kinds of testing tools are designed to simplify the work of investigation, one of which is the Mackintosh Probe. However, the use of Mackintosh Probe is less popular in Indonesia. The device has advantages, such as easy to use, light, requires no calibration, and requires a relatively low cost when compared to other soil strength testing. However, it also has drawbacks. Data obtained from the test results are in the form of number of blows and depth, making it difficult to be applied in further calculation of soil. This research was conducted to determine the shear strength value of soft soil based on Mackintosh Probe testing, by creating correlation value between Mackintosh Probe testing with shear strength (cu, φ) from triaxial testing and Mackintosh Probe with field vane shear test (Su). The tests were carried out in 35 points. Field trials were conducted in Siak District, Riau, with locations spread out in several villages located not far from the river. Based on the research conducted, test results show that the value of Mackintosh Probe testing is directly proportional to the value of Su, if the value of Mackintosh Probe is great, then the value of Su is also increasing. Whereas the correlation value between Mackintosh Probe testing and cu and φ reveals no positive data connection.