Dynamic pressures against two adjacent retaining walls
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Date
1992
Authors
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Journal ISSN
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Publisher
University of New Brunswick
Abstract
The dynamic pressures between two adjacent
retaining walls were researched. Three tests of s o i l i n i t s loosest
state and three tests of s o i l i n a dense state were conducted. The
s o i l used was a dry s i l i c a sand. The acceleration of the dynamic
tests was kept w i t h i n the range of 0.4 to 0.6'^ for frequencies
ranging from 4 to 10 Hertz—Hfe} or cycles per second (cps) . The
results were compared to a study done by a masters student on a
single retaining wall.
The s o i l settlement indicated a s o i l u p l i f t at
seven cps f o r a l l t e s t s . Additional tests ruled out wall movement
and s o i l migration. These tests did not rule out a natural
frequency of the walls or of the s o i l being about seven cps,
though. Also, a rocking motion of the test box at higher
frequencies may have caused excess s e t t l i n g and the u p l i f t .
Comparison of the output of pressure cells # 2
and # 3 show that the dynamic pressures against the adjacent walls,
supporting a f i n i t e amount of s o i l ; is greater than against a
single retaining w a l l , t h e o r e t i c a l l y supporting an i n f i n i t e amount
of s o i l.