Based on Daily Traffic Average of Palembang-Inderalaya in 2007, traffic volume of 2 ways of Palembang City for traffic capacity had been reach at 19900 vehicles/2 ways/day. Therefore, in order to decrease traffics jam then government has built Palembang-Inderalaya Highway (Palindra). According to topography of Palembang City, it has lying on lowland areas with soft soils type which has high compressibility. The objectives of this study are to estimate soft soils settlement with various method of consolidation which are oedometer test, prefabricated vertical drain (PVD), and vacuum consolidation method (VCM). The results of this study showed the numbers of settlement of soft soils 1,479 m for 17,24 years in oedometer test, 1,342 m for 105 days in PVD with square pattern, and 1,354 m for 90 days in PVD with triangular pattern. Meanwhile, the numbers of settlement with VCM method have 2,250 m for 105 days with PVD square pattern, and 2,251 m for 90 days with PVD triangular pattern. Based on those results, it can be concluded that VCM triangular pattern more effective than others.

Failure of concrete in the environment which containing sulphate causes damage to the cement bonds. One of environment that contains sulphate is peatlands. Peat water has a low acidity (pH) that it can damage the concrete slowly from the edges and corners with release of granules and becomes a porous. On this research, Ground Granulated Blast Furnace Slag (GGBFS) is a mineral additive that used as an additive to reduce the damage. The purpose of this research was to determine the effect of using variations of GGBFS and the optimum percentage of using GGBFS on Portland cement type II. This research outline divided into several stages, i.e. material testing, manufacturing cylindrical specimens with addition 0 %, 2%, 4%, and 6% of GGBFS and concrete age 7,14, 28 days, testing of specimens and analysing test result. Also, the treatment of specimens carried out using peat water. The result show that GGBFS increased compressive strength of the concrete, however it decreased at addition 2 % and 6 % of GGBFS on 7 days with amounting to -14.62% and -3.47%. The optimum percentage is concrete with variation of 4 % GGBFS and the minimum percentage is concrete with a variation of 0 % GGBFS.

The main issue of building constructions on soft soils is not a uniform settlement of soft ground, which has a slow process that effected construction failures and rising maintenance expenses. For many decades, to the improvement of ground soil stability, then applied using prefabricated vertical drain (PVD). Along the development of science and technologies, which followed by improvement of the soil stability method, that is called as Vacuum Consolidation Method (VCM). The objectives of this study are to determine how the effectiveness of vacuum consolidation with various patterns to soft soil settlement of constructions, and to find the right spacing of PVD installation due to un-uniform settlement of soft soils. The analysis of this study compared the numbers and rates of settlements in preloading, PVD, and VCM with various patterns, and to get a uniform settlement by two scenarios analysis, which are various spacing with single suction pressure (scenario 1) and single spacing with various suction pressures. Based on the result of analysis which showed the settlement of VCM in both patterns are 2.247 m in 105 days (square pattern) and 2.252 m in 90 days (triangular pattern). It means with a triangular pattern has 70.2 more effective than others in the rate of the settlement period. It also showed the VCM has larger than others in volume settlements. The results of 2 scenarios analysis showed that the implementation of scenario one was difficult due to various spacing, while scenario two can be implemented because numbers of settlements depend on suction pressure of the vacuum.

Pagar Alam City has high rainfall with highland topography that to trigger landslide events, especially in villages area and road at hillside. It affects to road networks activity which affected by road failure and inhibit vehicles traffic. This study will analyzed landslide vulnerability in main road of Pagar Alam City based on topography characteristic, geology, and soil types. Distribution of landslide occurrences will assessed base on landslide occurences density in unit areas. Frequency and distribuition of landslide occurrences will analyzed by landslide trigger factors such as stability, slope, soil type and geology, infrastructures type. Meanwhile rainfall extreme events period will be analyzed with general numbers extreme model. Finally, landslide vulnerability will be analyzed with spatial multi criterias evaluation (SMCE) ILWIS due to availability of input map factors, such as poin of landslide, sloppe, soil type, geology, drainage system, infrastructure, and landcover. The result of this study showed that distribution of landslide hazard potential will be occurred in Shouth Dempo District with 12605 hectares for high and very high landslide hazard potentials.Keywods: Landslide, SMCE, ILWIS

Mountain topography makes Pagar Alam City is highly prone to natural disasters such as landslides, floods, tornados, and volcanoes, as well as disasters due to of human negligence such as forest fires, land and houses fires. According to it, the government building development so that the State must be able to support implements selected BPBDs main tasks and functions as the regional disaster management agencies. In planning the building of the State, one of the stages that must be met is the study. This study aims to evaluate the economic feasibility of investment in buildings State based disaster loss assessment using the Post Disaster Need Assessment. The result of investment analysis shows a positive NPV IRR> discount rate, the building of the State BPBDs feasible to continue. Keywords : PDNA, mitigation, the feasibility of government building.