The CFG pile has many advantages, such as small settlement, simple construction. So it has been widely used as the common foundation treatment in China. However, it has been carefully used in soft soil site because of quality defects of CFG piles. Based on a highway project case of soft site treatment using CFG piles in Fujian province, the reason of the pile integrity problems is analysed, and several solving methods are proposed. The studies show that long spiral drilling technology should be better than the sinking pipe method and geobag combined with sinking pipe method in the construction process of the CFG pile in soft soil site. The research results have significant reference to the application of CFG piles in soft soil site.
Offshore oil and gas resources are major sources of future global oil and gas increments. Suction bucket foundations are a new type of foundation that is widely used for offshore oil and gas exploitation platforms. Such platforms are often subjected to dynamic loads caused by storms, waves, or earthquakes, which cause the instability and liquefaction of seabed sand layer foundations. These loads jeopardize the safe operation of offshore oil and gas platforms. For this reason, the cyclic elastoplastic constitutive model is adopted in the ocean liquefaction stratum, in consideration of the foundation liquefaction and large deformation effects. To study the changes in the excess pore water pressure of the suction bucket foundation in different ocean liquefaction formation thicknesses under the action of seismic loads.
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