PERENCANAAN TEMBOK PENAHAN TANAH DIRUAS JALAN SELOGABUS-MALO DESA TANGGIR KECAMATAN MALO KABUPATEN BOJONEGORO

Abstract

Tanggir Village is a village in a hilly area in Malo District, Bojonegoro Regency. Along the north side of the road there is a forestry area in the Parengan Tuban area and on the south side it is parallel to the Bengawan Solo river. One of the factors that caused damage to the road was the run off of the rainwater flow from the Perhutani hills leading to the road body, and also the overflow of the Bengawan Solo River water discharge created a saturated condition and the instability of the road body. The purpose of this study was to plan a cantilever type retaining wall and to know the calculation of the dimensions of the retaining wall structure, the results of the analysis of the retaining wall on overturning forces, shear forces, and soil carrying capacity. The dimensions of the retaining wall are 3m high and 1.8m wide. This study uses the Rankine method for calculating soil pressure and stability against overturning and shearing, the results meet the safe category against overturning = 0.290 < 0.30 (Safe), and against displacement = 2.331 > 1.50 (Safe). Terzaghi method is used to calculate the bearing capacity of the soil, and the result is safe for the soil bearing capacity = 34,402 kN/m3 > Qmax 9,744 (Safe). The structural reinforcement used is the main reinforcement for vertical walls = D 19 distance of 250 mm, Shear reinforcement for vertical walls = D 13 distance of 250 mm, Reinforcement for vertical walls = D 13 distance of 250 mm, Main reinforcement on the leg plate = D 19 distance of 200 mm , Shear reinforcement on the leg plate = D 13 250 mm distance, Reinforcement for the leg plate = D 13 250 mm distance.