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doi:10.3850/GI019
Influence of Ground Improvement on Deflections of Diaphragm Walls in Deep Excavations
Bin-Chen Benson Hsiung1 and Richard Nan Huei Hwang2
1Department of Civil Engineering, National Kaohsiung University of Applied Sciences, 415 Chien- Kung Road, Kaohsiung City, 807, Taiwan.
benson@cc.kuas.edu.tw
2Moh and Associates Inc, 11F., 3 Dun- Hwa South Road, Sec. 1, Taipei City, 10557, Taiwan.
Richard.hwang@maaconsultants.com
ABSTRACT
In order to reduce wall movements induced by deep excavations in soft clay, grouted slabs are frequently adopted to brace diaphragm walls. The effectiveness of a slab will depend on the stiffness of the slab which is proportional to the thickness and the Young’s modulus of the slab and is inversely proportional to the span of the slab. Numerical analyses indicate that, for an excavation carried out to a depth of 18.5m in the Taipei Basin, the maximum wall deflection of 1m diaphragm walls was reduced by 38%, 56% and 63% by installing grouted slabs of 1m, 5m and 12m in thickness and 27m in span below the formation level.
Keywords: Deep excavation; grouted slab; wall movement.
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