| Summary: | The high mobility of people from Semarang to Solo, or vice versa, is the
reason of construction of Toll Road Semarang - Solo by the government. Toll
Road Semarang - Solo Section VI , Lemah Ireng-Bawen, passes through clayshale
soil that has mechanical properties such as shear strength reduction. To handle
this problem contractor changed the slope of trapping and consequently it requires
land acquisition that have an impact on the cost and time requirements. This study
aims to provide suggestions clayshale slopes handling by providing surface
treatment so that land acquisition does not need to be done. Slope is maintained at
1H: 2V and surface treatment uses masonry walls (lining).
Numerical analysis was performed to determine the initial slope stability
and slope stability by lining a surface treatment. Modeling slope with a decrease
in shear strength was conducted to determine the stability of the slope after the
exposure of water, air, and sunlig. Analysis was performed on stationing 22 +500
by using PLAXIS software version 8.6 and Slope / W 2004.
Output from a numerical analysis are safety factors and total
displacements every stage of excavation. Safety factors obtained on the slopes
with a decrease in shear strength design has a value of 0,848 on the design
parameter and 0,257 on the residual parameter. While the initial slope and slope
modeling by lining has a value 1,137 on the initial slopes and 1,357 on the slopes
with the lining. So it can be said that initial slope is stable or secure and can
withstand lining load. Slope with earthquake load modeling shows that the slopes
strongly resist earthquake loads left direction but not right direction. For the longterm
safety, it needs further research regarding the handling of the slope with
earthquake loads.
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