Abstract:
Slope events usually precede the occurrence of small cracks in
soil on the slopes. The small cracks become deep crack and will
be a potential landslide. If the potential landslide plane is
getting longer, the slope will occur sliding. The small cracks in
the soil are usually not visible so the soil is still considered to
be intact, not cracked. At the time of soil sampling in the field
and testing in the laboratory, the soil is regarded as intact soil
and not cracked. This research aims to determine the effect of
crack propagation in the soil against changes in cohesion values
and internal shear angle in laboratory testing. A series of
laboratory tests using a modified shear test apparatus was
performed. Direct shear testing using a modified shear test
apparatus was carried out on a high plasticity clay soil. The
crack propagation given is 25%, 50%, 75% against the diameter
of the specimen. The results showed that crack propagation
occurring in the soil is very influential on cohesion. In a crack
condition of 100% then the value of soil cohesion becomes
zero. Other results showed that crack propagation did not affect
the internal shear friction angle. Regardless of the length of the
crack that occurs, the internal friction angle remains as in the
conditions have not been cracked.
