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J u n e 0 6 - 0 7 , 2 0 1 9
P a r i s , F r a n c e
Page 31 Research & Reviews: Journal of Engineering and Technology
ISSN: 2319-9873 Civil engineering 2019
International Conference on
Structural and
Civil Engineering Research
The rectangular closed diaphragm (RCD) wall is used in highway and railway
bridge engineering. The foundations are subjected to combined vertical-
horizontal-moment (V-H-M) loadings during operation especially when used as
the foundation of arch bridge. In this study, the numerical modelling adopted in
this study was verified by comparing the calculated capacities with those from
previous studies. The results of a finite element study addressing the effect
of embedment ratio (L/D) of RCD foundations on the bearing capacity under
uniaxial and combined loadings are investigated. The kinematic mechanism
accompanying failure under uniaxial loading is addressed and presented for
different embedment ratios. A series of equations are proposed to predict the
ultimate vertical, moment and maximum horizontal bearing capacity factors
as well as to define the capacity envelopes under general combined loads
generated with probe method. Predictions of the uniaxial bearing capacities are
compared with other models and it is confirmed that the proposed equations
appropriately describe the capacity of RCD foundations under uniaxial vertical,
horizontal and moment loading in homogenous cohesive soils. Based on finite
element analyses, the equation of failure envelope can be used to evaluate the
stability of the rectangular closed diaphragm wall foundation in clay.
Biography
Geng Cao is pursuing his PhD, major in civil engineering
in Southeast University in China, and also is a Teacher in
Hanzhong vocational and technic college, Shaanxi Province,
China. His research interests are the foundations of highway
and Railway Bridge, and the rectangular closed diaphragm
(RCD) wall foundation especially. He has published five papers
in reputed journals.
Failure envelopes of rectangular closed diaphragm wall
foundation in cohesive soil under combined loads
Geng Cao, Wei-Ming Gong and Gou-Liang Dai
Southeast University, China
Geng Cao et al., JET 2019, Volume:8