ANALYSIS OF SLOPE STABILITY IN SOFT SOIL USING HARDENING SOIL MODELING AND STRENGTHENING OF BAMBOO MATTRESS

Abstract

The development of railway double track infrastructure does not always pass through section
with good soil carrying capacity, some also pass through existing soil layers with soft - very soft consistency.
More than 10% of the land area in Indonesia or around 20 million hectares is soft land consisting of soft clay
and peat soils. Taking into account the problems in soft clay which is quite influential in the success of
infrastructure development, soil improvement must be carried out so that the infrastructure is not damaged
before the planned age. Soil improvement with a bamboo mattress system provides a cost-effective and
reliable solution to maintain the landfill stability and reduce the differential settlement. The Finite Element
Model is a numerical way of solving problems in physical science and mathematics. This numerical method
provides approximate values of unknown parameters at a number of discrete system nodal structures. The
standard Hardening Soil Model (HS) is an advanced model for modeling soil behavior. However, the value of
the soil stiffness is described more accurately by using three different input stiffnesses namely triaxial
loading stiffness (E50), triaxial unloading stiffness (Eur) and one-way loading stiffness (Eoed). For certain cases,
the Hardening Soil Model (HS) method is more accurate and approaches the field conditions. This can be
seen from several previous studies which show that the Hardening Soil Model (HS) approach is very typical
with the results of field testing. The value of the safety factor (SF) from the analysis of slope stability in soft
soil using hardening soil modeling and strengthening of bamboo mattress analysis is 2.10.