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Gawit Hidayat
PS T. Sipil FT Unlam
Engineering

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STUDI EKSPERIMENTASI PERBANDINGAN KARAKTERISTIK CAMPURAN TANAH BERPASIR DAN KAOLIN DENGAN CARA DYNAMIC DAN STATIK COMPACTION Gawit Hidayat
INFO-TEKNIK Vol 11, No 1 (2010): INFOTEKNIK VOL. 11 NO. 1 2010
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/infotek.v11i1.1770

Abstract

One of the many factors that affect the compaction is the way of its compaction, the common ways which used in laboratory are Standard and Modified Proctor. The aim of this research are to use the comparison of characteristic value of soil mixtures of Padalarang Sandy Soil and Nagrek Kaolinite in the static and dynamic compaction and find a relationship among CBR with Static and Dynamic Cone Penetrometer.This research shows that at the same condition of dry density and optimum water content the compacted soil with static way get static force 8 ton and 11 ton to close standard and modified proctor results, and also to have the characteristic values less bigger than dynamic one about 3.75% to 46.68%. This item can be shown by permeability tests and the characteristics by california bearing ratio, static and dynamic cone penetrometer. Besides the water content, the percentage of Padalarang Sandy Soil and Nagrek Kaolinite’s mixture very affect the mechanic properties such as increasing of soil against the mixture with Nagrek Kaolinite will tend decreasing  the CBR and qc  value  and   increasing N DCP value. The trend of regresion curve resulted by static and dynamic compaction is similar. The approach equations which often used are non linear equations therefore the results are in a good enough and satisfied regresion coefficient about 0.8 to 1.Based on the result of tests also show that the soil mixtures of Padalarang Sandy Soil and Nagrek Kaolinite is not stable against soaked process where can be seen with the tedency of the characteristic value can not be measured in the soaked condition.
STUDI KASUS ANALISA KERUSAKAN ABUDMENT JEMBATAN SEI. BAHALANG KALIMANTAN TENGAH Gawit Hidayat
INFO-TEKNIK Vol 11, No 1 (2010): INFOTEKNIK VOL. 11 NO. 1 2010
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/infotek.v11i1.1771

Abstract

Bahalang bridge is a truss bridge B Class across Bahalang river in Ampah (Central Kalimantan), was built as conneting road for transport coal. The bridge building has a problem. It’s like an abutment failure in eastern abutment of Bahalang bridge. This abutment rotate 30 degree, so, the back side of abutmen has decline about 2 metres and slipped from its place to the river about 1 metre.The purposes of this study are to analyze of soil layer behavior and to find out main cause of damage on the abutment. Writer used approach calculation analysis of collapse using Plaxis and Xstabl.There is two options of calculate. Option one high of  water level river are in place (29,5 metres). In Xstabl show SFmin= 0,764 and Plaxis show total displacements=  64,5 metres. In option two where is high of water level  river assumsed (27,4 meters). In Xsstabl show SFmin= 0,807 and Plaxis show total displacements= 4,15 metres. From several alternatives conditions wich was analyzed by Plaxis, the collapse is known happened  during the placement of the fill in the eastern approach. Fill comprised sand material that was being placed rapidly by direct dumping from trucks and spreading by excavator. The results are total displacement= 6,45 metres. Pile bending moment result over the bending moment allowable value. That is 57,81 kNm on front pile, and 63,90 kNm on back pile. Abudment damage can be concluded due to the displacement of excess, so it is potentially broken pile 
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