Analisis Kestabilan Tanah Timbunan (Embankment) Pada Tanah Rawa Dengan Menggunakan Bambu (Studi Kasus : Jalan Toll Manado-Bitung)

Abstract

Construction of the road structure in the form of embankment on soft ground conditions pose
some problems, such as stability, seattlement, horizontal movement (lateral displacement), and
collapse of ground slopes or uneven base decline (differencial seattlement). This is because soft soils
generally have strong shear and low permeability and great compressibility. Because the soft soil has
a low permeability, the time required for consolidation is longer. At the time of consolidation, the
ground stress at the beginning of the loading is borne entirely by the pore-water stress. Then slowly
this stress is transferred to the effective stress of the soil, so that the soil has increased the strength and
carrying capacity. Thus, if a construction is to be built on soft soil, in order to avoid a substantial
settlement in the building and to obtain a good carrying capacity of the soil, the construction process
should be carried out after the soil has been fully consolidated. In this study it will be on the analyze
the stability problems on embankment on soft soil by using bamboo as micropile with case studies
marshland improvement efforts to heap on it on a toll road project Manado Bitung in North Sulawesi.
       The aims of this study are to obtain a graphic relationship between safety factor value and
engineering properties of soil (c, φ, γ) and to obtain a graphic relationship between safety factor value
and it’s α   value.
      Methods used in this study are laboratory scale experiment using bamboo as micropile to simulate
the soil stability and rockscience program forn slope stability analysis.
      Results revealed that based on the analysis results of construction of embankment without bamboo
as micro pile and construction of embankment with bamboo as micro pile, it can be concluded that  as
swamp land has low carrying capacity and generally have high water content and very low
permeability so often cause problems inside construction of civil buildings. A common problem with
soft soil is the problem of stability. The result of the analysis, showed that other data (
ï¦ , γ, c, h,) if
the value of
ï¦Â  increase then the safety factor will increase, also if the value of c increase then the
safety factor  will increase, but if the value of γ is decrease then the safety factor will decrease. By
raising the h embankment height, will reduce the safety factor value.

Keywords: slope stability, geological process, landslides, Rocscience slide program, safety factor