8 research outputs found

    Lapisan Perkerasan Komposit Batu Pecah pada Kontruksi Jalan Hutan

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    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

    Pengaruh Kerusakan dan Kelerengan Jalan Hutan terhadap Produktivitas Pengangkutan Kayu Studi Kasus di Kalimantan Barat

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    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

    Kemungkinan Penggunaan Latex untuk Stabilisasi Badan Jalan Hutan

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    Among the many known stabilized methods and materials that can be applied to improve forest road stability, latex is thought of as one such material that deserves trying. This experiment is to asses the possibility of using latex as a stabilizing agent,The fol/owing conclusions are in order: Latex can be used as stabilizing agent for clayey soils as subgrade material. A 4% latex content turned out to be effective to keep swelling, due to soaking in water, within a limit of 4,3%. Degree of compaction has no significant effect of swell. Degree of compaction and percentage of latex content has significant effect on bearing capacity. Latex may be recommended as an alternative material for stabilizing subgrade soil in forest road construction

    Pengaruh Penyaradan Kayu dengan Traktor Rantai Kelabang terhadap Kerusakan Tegakan Tinggal

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    The study of the effect of log skidding on the damage of residual stand was carried out in one logging company in West Kalimantan in 1986. The meaning of residual stand in the study are trees with diameter 20 cm and up. The result of the study shows that the average damage of residual stand is 18% per hectare, not included the damage caused by felling i.e. 15% per hectare. According lo Indonesian Selective Cutting System, the residual stand is good enough to fulfill the sustained yield condition, that is keep at least 25 core trees to be left per hectare. The role of skidded trees number and stand density was significant effect on the residual stand damage

    Pengaruh Penyaradan Kayu dengan Traktor Rantai Kelabang terhadap Penggeseran dan Pemadatan Tanah Hutan

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    The study of the effect of log skidding by crawler tractors on forest soil displacement and compaction wall carried out in one logging company in West Kalimantan in 1986. The results of the study are as the following :The average volume of soil displacement was 0.06 cu.m/m of skid road, it i6 equal to 0.061 ton/sq.m. This level of soil displacement iis higher than the soil loss tolerance of 0.0002 ton/sq.m.Soil compaction as indicated by the average soil bulk density is 0.16 g/cu.cm. At this level of compaction, the porosity is 56% (far higher than 10% minimum porosity), which means that the growth of vegetation will be still favourable.The role of soil water content and slope on forest soil displacement was positively significant. The role of skidding intensity on forest soil compaction was positively significant and the role of soil water content and slope on forest soil compaction was negatively significant