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S Sutopo

Pusat Penelitian dan Pengembangan Hasil Hutan

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Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Chemistry Decision Sciences, Operations Research & Management Energy Materials Science & Nanotechnology

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PENGARUH KERUSAKAN DAN KELERENGAN JALAN HUTAN TERHADAP PRODUKTIVITAS PENGANGKUTAN KAYU STUDI KASUS DI KALIMANTAN BARAT S Sutopo; Rahardjo S Suparto
Jurnal Penelitian Hasil Hutan Vol 5, No 7 (1988): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/jphh.1988.5.7.420-424

Timber transportation productivity decreases when forest road is deteriorated and the 8lope is large. This study tried to investigate the effect of slope and road damage on timber transportation productivity, and was carried out at the PT Sari Bumi Kusuma forest company areas in West Kalimantan in 1987.The investigation results are as follows:Slope difference of 5% has significant effect on transportation productivity. On flat, medium and steep slopes, the productivities are 265, 219 and 132 m3. km/hr, respectively.Transportation productivity is significantly influenced by a difference of 15% damage on the road. Productivities on relatively good road, medium damaged and badly damaged roads are 292,213 and 136 m3.km/hr, respectively.On flat and badly damaged roads (at a damage level greater than 30%), transportation productivity is reduced 64% which caused significant financial loss. The allowable road damage on (at terrain without causing financial loss is 40%.On medium terrain and medium damaged roads (at damage levels between 15% and 30%), the loss is significant. Medium damaged (between 15% and 30%) and heavy damaged roads (greater than 30%) caused transportation productivities to be decreased as much as 25% and 58%, respectively, The allowable road damage on medium terrain without causing financial loss is 26%.On steep terrain, transportation productivity is decreased significantly i.e. 58% of those on medium damaged roads (between 15% and 30%). A maximum road damage of 18% is allowable without causing financial loss.There is a significanf interaction between slope and road damage. The steeper the slope and the heavier the road damage, the larger the decrease in transportation productivity.In the transportation distance of 60 km and the timber price of US$ 70/m3, if timber transportation productivity decreases 30%, it is strongly suggested to repair damaged road immediatly in order to prevent financial losses.

STABILISASI TANAH LIAT DENGAN KAPUR PADA KONSTRUKSI BADAN JALAN HUTAN DI PULAU LAUT Rahardjo S Suparto; S Sutopo
Jurnal Penelitian Hasil Hutan Vol 1, No 2 (1984): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Subgrade construction is an important part in forest road building, Subgrade soils with a high clay content could not be used satisfactorily as forest road construction material unless it is treated to increase its stability. The improvement of the physical characteristics of clay soils related to subgrade construction can be achieved by mixing lime of certain proportion into the soil. The purpose of this investigation is to determine the amount of lime required for subgrade stabilization which have high clay content in Pulau Laut, South Kalimantan The investigation reveals the following :1. The efective amount of lime stabilization of soils is 7 percent of the dry weight of the soil, resulting in the following physical properties :- Bearing capacity is 167 kg/cm2 at air dry condition,- Percent of swell is 2.3,- Plasticity index is 25.5, and- pH is 9.00.2. Stabilization with 7 percent lime is most effective for use in forest road subgrade containing about 66% clay.

Lapisan Perkerasan Komposit Batu Pecah pada Kontruksi Jalan Hutan Rahardjo Rahardjo; S Suparto; S Sutopo
Jurnal Penelitian Hasil Hutan Vol 4, No 2 (1987): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

The use of pavement in Indonesian forest road construction at present is not common practice. Paving of logging roads is still considered too expensive, especially when its construction is not rational and effective. Information on pavement design especially with regard to its composition should help forest companies in solving their forest road construction problems.This investigation looks into the problem of finding the proper composition of crushed gravel and sand or rock dust for the construction of pavements. This kind of pavement is thought to have high shearing strength, stability and density.A series of laboratory test were conducted for this purpose, employing factorial analysis .A performance test in the field was conducted to compare with the Telford system using paired samples.The investigations revealed the following:- Crushed rock had significant influence on the shearing strength of the pavement. This material mixed with rock dust showed significant interaction.- Rock dust itself and water did not have significant effect on the shearing strength of pavement.- The use of water may help facilitate the compaction process guiding the filler material into the voids among the crushed rock particles.- The proper composition turned out to be three units of crushed rock and two units of rock dust, resulting in a shearing strength of 0,226 kg/cm2.- Crushed rock composite made better pavement than the Telford system, resulting in lower settling of subgrade.- Based on the above, it is recommended to use a mixture of 2-3size crushed rock and rock dust in the proportion of 3 : 2 for pavement of forest roads, using smooth drum roller to obtain proper compaction.

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