The stability of diaphragm wall for deep excavation
Rapid urbanisation and the increase in population has led to massive use of underground spaces, especially in the city. Before an underground structure is built, the use of retaining structure is crucial in order to prevent the excavation from failure. Diaphragm wall is a widely used retaining s...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English English |
| Published: |
World Academy of Research in Science and Engineering
2019
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/79113/1/79113_The%20Stability%20of%20Diaphragm%20Wall.pdf http://irep.iium.edu.my/79113/2/79113_The%20Stability%20of%20Diaphragm%20Wall_SCOPUS.pdf http://irep.iium.edu.my/79113/ http://www.warse.org/IJATCSE/static/pdf/file/ijatcse45816sl2019.pdf |
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| Summary: | Rapid urbanisation and the increase in population has led to
massive use of underground spaces, especially in the city.
Before an underground structure is built, the use of retaining
structure is crucial in order to prevent the excavation from
failure. Diaphragm wall is a widely used retaining structure,
particularly for deep excavation. A holistic understanding of
the performance and its behaviour is essential to provide
stability of the soil retained. A parametric study by using
Plaxis2D has been conducted to determine the factors
affecting the stability of diaphragm wall and the excavation
sites in underground Mass Rapid Transit station of Hospital
Kuala Lumpur (HKLX). The objectives of this study are to
determine the effect of diaphragm wall stiffness, groundwater
drawdown and the depth of wall for deep excavation. The
stability is captured based on the lateral deflection of wall,
bending moment, safety factor and ground movement near the
diaphragm wall. From the study, it is found that the diaphragm
wall with high stiffness can reduce wall deflection up to 20%
with the addition of 49% bending moment and achieve a high
factor of safety. Furthermore, groundwater drawdown is seen
reducing lateral deflection of the wall up to 1.08% as well as
increasing the factor of safety. Finally, decreasing wall depth
reduces the wall deflection by 0.38% and also the basal
heaving. |
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