Predicted overall stability of embankment on very soft soil reinforced by bamboo piles based on full-scale test data

Abstract

Local government has built a coastal dike for countermeasurebig waves from the seashore in North Maluku.As consequence, the condition of the ground has consisted deposit very soft soils. As far as, a traditional foundation system such mattress and bamboo pile installed to increase bearing capacity of the soft ground. However, theIndonesian guidelines recommended to design embankment using trial data from the field test data,it is to difficult to applied by local engineers and government. Therefore, theproposal of research is a simple method using reasonable physical equations for predicting overall stabilityof dike on very soft soil based on full-scale tests on the traditional foundation, which modeled a mattress from soil admixed cement on the geo-bamboo,and its supported by bamboo piles. In which are modeled the mattress contained soil with cement 10%, thickness, Dm of 22 cm, bamboo pile installed by diameter, d of 8.1 cm, spacing, s of 3d, length, L of 1.10 m.In order to design the parameters of coefficient of friction αp for overall stability, concrete blocks were placed on the mattress reinforced bamboo piles. Finally, the overall stability such factor of safety, Fs is found more than 1.2 for design height of embankment, Hb less than 1.0 m.