THE EVALUATION OF THE CAUSES OF RETAINING WALL STRUCTURE FAILURE AT A RIVER BASED ON SNI 2847:2013
In this paper, the application of SNI 2847:2013 in the evaluation of the caseof a retaining wall failure is presented. The method is the analyticalretaining wall evaluation, which consisted of visual inspection in the field,depth measurement of pile and sheet pile, and the quality test of concretematerial. The data were used as input in structure modeling using FiniteElement Method (FEM) software to calculate each structural member'srequired strength (Ru). The calculation was done to obtain the designstrength (ØRn) of the structural member. The retaining wall is consideredsafe if its design strength is greater than or equal to the required strengthor ØRn ? Ru. If this condition cannot be fulfilled, the retaining wall isconsidered failed, and then the causes of failure would be performed. Theresult showed that the depth of the pile and sheet pile is less than therequired minimum depth, and concrete quality is below the specificationmentioned in the as-built drawing data. According to structural analysis andcalculation of site investigation data, it could be known that the causes ofretaining wall failure are the design strength is smaller than the requiredstrength and the vertical moment due to its self-weight is much smaller thanthe horizontal moment due to soil and water pressure, so it causes thestructural sliding.