Zhejiang Petrochemical Zhoushan Project East Second Retaining Wall Vibratory Stone Column Foundation Treatment Project
[Overview] The east No. 2 revetment of the Zhejiang Petrochemical Zhoushan project is approximately 880m long. The area where the revetment is planned has been partially backfilled, mainly with quarried stones. According to the current borehole data, the compacted fill layer is loose, mainly composed of quarry rubble and stones. The content of rubble stones accounts for more than 80%, with particle sizes generally ranging from 60 to 150mm, and a maximum of 400mm or more. The thickest part of the layer is approximately 20m; the silty clayey silt is in a flow plastic state, highly compressible, with a maximum thickness of approximately 25m.
The East No. 2 revetment of the Zhejiang Petrochemical Zhoushan project is approximately 880m long. The area where the revetment is to be constructed has been partially backfilled, mainly with quarried stones. According to current borehole investigations, the compacted fill layer is loose, mainly composed of crushed stones and boulders from the quarry area. The content of crushed stones accounts for over 80%, with particle sizes generally ranging from 60 to 150mm, and a maximum of 400mm or more. The thickest part is approximately 20m; the silty clayey silt is in a flowing plastic state, highly compressible, and the thickest part is approximately 25m. Vibroflotation stone columns will be used to treat the two-layer soil during revetment construction.
All vibroflotation stone column construction areas have been backfilled to form land-based construction. According to the preliminary survey report, the fill material is mostly crushed tuff from the quarry area, with very high rock strength. The fill material varies in size; currently, the largest visible surface particle size in the construction area is up to 1.0m, and the maximum thickness of the quarried stone fill is up to 26m. Due to the presence of large quarried stones, pre-drilling is required before the vibroflotation stone column construction. A dry pneumatic drilling rig will be used to pre-drill in areas where the vibroflotation equipment cannot penetrate the quarried stone.
After crushing and breaking through the quarried stone fill, the construction of vibroflotation stone columns will proceed, allowing the vibroflotation stone columns to smoothly pass through the tuff fill layer and enter the designed silty clayey silt layer for compaction, thus ensuring the construction quality and progress of the vibroflotation stone columns. The pre-drill hole diameter is 600-650mm, and the pre-drill depth reaches the bottom of the first backfill layer.
The project's engineering challenges include limited site space and equipment cross-operation, making site coordination a major challenge. The backfill layer is also getting deeper, demanding high process requirements. Our team developed a highly efficient construction plan based on the site conditions. The project officially commenced construction on August 1, 2020, and after three months of day and night work, it will be completed by the end of October.
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