| Summary: | The expansive clay have and high of swelling that it is caused by
deferensiate of water content. Footplate and mini pile can be used for load
support. Main factor of building destroy is caused by heaving of expansive clay.
State number of swelling is not equal, that caused heaving and cracking at the
Highway Road, Concrete Slab and Lining Canal. On soft soil, the pile foundation
support a little load, that it will be lifting up. According to the reason above are
important, the research related to the effect of swelling on the lift up of piles.
Swelling research was done, that is used high plasticity clay from
Tuksono, Krebet, Wates, Kulon Progo. The research model is used box 120 x 120
x 120. The box content of 40 cm sand, 80 cm high plasticity clay with
compressed. Also, it is used the pile model � 10 cm. The number of vertical
swelling find out from the strainmeter conect to the straingauge. The proving ring
provider the total swelling on first part of pile. The research use some models.
There are variable of pile � 20 cm, 40 cm, 60 cm, and 80 cm. In this research, the
water content test use the gypsum block. Shear resistant found out from shear test
tool, water content are depth of pile.
The result show the equation of water content test with gypsum block is
y = 0,1124x+ 25. Characteristic of swelling pressure is affected by water content
and depth. Swelling pressure affect pile heaving at active zone. Relationship
swelling pressure and cohesi are show 0,05 x c kN/m2. Unit of shear resistance
and direct shear can be prediction use fs(p) = 1,468 x fs(GL), and unit of shear
resitance and cohesi is fs = 0,00224 x c kN/m2.
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