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http://dx.doi.org/10.7843/kgs.2018.34.11.21

Evaluation of Soil Disturbance Due to Bucket Installation in Sand  

Kim, Jae-Hyun (Dept. of Infrastructure Safety Research, Korea Institute of Civil Engrg. and Building Technology)
Lee, Seung-Tae (Investment Planning & Engrg. Office, POSCO)
Kim, Dong-Soo (Dept. of Civil and Environ. Eng., KAIST)
Publication Information
Journal of the Korean Geotechnical Society / v.34, no.11, 2018 , pp. 21-31 More about this Journal
Abstract
Bucket foundations are widely used in offshore areas due to their various benefits such as easy and fast installations. A bucket is installed using self-weight and the hydraulic pressure difference across the lid generated by pumping out water from inside the bucket. When buckets are installed in high permeable soil such as sands, upward seepage flow occurs around the bucket tip and interior, leading to a decrease in the effective stress in the soil inside the buckets. This process reduces the penetration resistance of buckets. However, the soil inside and outside the bucket can be disturbed due to the upward seepage flow and this can change the soil properties around the bucket. Moreover, upward seepage flow can create significant soil plug heave, thereby hindering the penetration of the bucket to the target depth. Despite of these problems, soil disturbance and soil plug heave created by suction installation are not well understood. This study aims to investigate the behavior of soil during suction installation. To comprehend the phenomena of soil plug heave during installation, a series of small-scale model tests were conducted with different testing conditions. From a series of tests, the effects of tip thickness of bucket, penetration rate, and self-weight were identified. Finally, soil properties inside the bucket after installation were approximated from the measured soil plug heave.
Keywords
Bucket foundation; Suction installation; Physical model test; Sands; Soil disturbance;
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