| Summary: | 碩士 === 國立屏東科技大學 === 土木工程研究所 === 83 === This study was undertaken to investigate the stability of an
embedded shallow foundation located adjacent to a underground
void. The foundation stability analysis was carried out by
using a two dimensional, nonlinear, elastic-plastic finite
element computer program. For such complex problem and
considering of limited time span, the scope of the study was
limited to the stability analysis of a 3-ft wide foundation
with a 3-ft embedment which located near a underground circular
void. The considering foundation soils included a commercial
kaolinite clay and a silty clay. A wide range of void
conditions were investigated which included three different
void sizes, three different void eccentricities, and many
different void depths. A total of 115 conditions were
investigated. The results of the investigated indicated that
the presence of a nearby undergound void would affect the
stability of a shallow embedded foundation. The ultimated
bearing capacity of such foundation would increase as the
distance between the foundation and the increases. The results
of the analysis also indicated that there is a critical depth
to void (measure from the base of the foundation) beyond which
the presence of such voids has essentially no effect on the
performance of the foundation. By connecting void
eccentricities versus the associated critical depths, the
critical extent of each condition can be easily established.
For a given foundation with and foundation embedment, the
critical extent is a function of void size and foundation soil
strength parameters. Based on the results of the study, the
critical extent would increase as the void size increases, and
decrease as the soil strength parameter(s) increases.
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