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Title: Lateral earth pressures on braced retaining wall
Authors: Liu, Faxiang.
Keywords: DRNTU::Engineering::Civil engineering::Geotechnical
Issue Date: 2009
Abstract: The increasing demand for underground space, for use as transportation tunnels, railway stations, expressways and construction of high-rise buildings is present in Singapore. In an urbanized city and land scarce country like Singapore, deep excavations are constructed in close proximity to sensitive structures. Hence the prediction of lateral earth pressure, strut loads, lateral wall deflections and bending moments are important considerations to avoid damage to adjacent structures.
The Plaxis finite element program was used to simulate the excavation process on a total of 24 case studies with variable shear strength, depths of clay layer and wall stiffness. Clay is modeled as non-porous linear elastic perfectly-plastic material using the Mohr-coulomb model. The study is carried out to demonstrate the significance of clay undrained shear strength and wall depth below the excavation base on the strut forces, lateral earth pressure, wall bending moment and lateral deflection for a braced sheet pile and diaphragm wall in normal consolidated clay. Some relevant background information on this program is provided throughout the report in order to better understand the importance of the above mentioned characteristics.
The study shows that for a clay profile of increasing shear strength with depth, the maximum lateral wall deflection is found to fall in the higher range of 0.51%H to 1.11%H for sheet pile wall compared to 0.48%H to 0.84%H for diaphragm wall. Maximum bending moment is found to be about 1 to 1.5 times smaller in sheet pile wall and about 1.4 to 3.2 times smaller in diaphragm wall than for a clay profile with 50% lower shear strength. Maximum strut loads and lateral earth pressure show minimal difference for increasing shear strength. Comparative analysis between two different stiffness of retaining walls show a relatively small difference in lateral deflection whereas it shows a relatively large differences in the lateral earth pressure, maximum wall bending moment and strut loads. The factor of increasing wall penetration depth, D will be discussed in detail throughout the report. Some recommendations to mitigate the lateral wall deflections will be proposed as well.
Rights: Nanyang Technological University
Fulltext Permission: restricted
Fulltext Availability: With Fulltext
Appears in Collections:CEE Student Reports (FYP/IA/PA/PI)

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