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Analysis of Ground Movement During Diaphragm Well Panel Constructions in Sedimentary Marine Deposit  

Lee Cheol-Ju (Civil Technical Team, Construction Division, Samsung Heavy Industries Co., Ltd.)
Publication Information
Journal of the Korean Geotechnical Society / v.21, no.3, 2005 , pp. 43-54 More about this Journal
Abstract
The ground movements during three. full-scale trial diaphragm wall (DW) panel constructions were monitored and analysed. The DW panels were constructed in reclaimed fill where sedimentary marine deposit and residual weathered soils are being consolidated. The monitoring data showed exceptionally large lateral ground movements of up to 293 mm near a trench due to the DW panel constructions, which is about 0.8$\%$ D, where D is the maximum excavation depth. It was observed that deliberate holding period of the trench resulted in a significant increase in the lateral ground movements of about 50-225$\%$. A pre-treatment of the marine deposit by installing a single line of jet grout columns around the trench prior to the excavation was found to be a very effective way of reducing the ground movements. The measured ground settlements were compared with some relevant case histories. DW panel constructions in sedimentary marine deposit are likely to cause maximum ground surface settlement up to 0.225$\%$ D.
Keywords
Deformation; Diaphragm wall; Excavation; Field measurement;
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