Method for treating quasi-prepressing groundwork of artificial island

Abstract

The present invention relates to a tidal zone and shallow water area petroleum sandstone artificial island construction method, in particular, it is a kind of artificial island quasi-precompression foundation treatment method. Said method includes the following steps: firstly, filling inshore weak clay layer surface with island body block stones to make the inshore weak clay layer surface be reached to artificial island construction and design standard before winter stoppage period and form foundation treatment heaped layer; then utilizing the packed island self-weight to increase effective stress of lower portion weak clay layer under sea-water so as to raise load-bearing capacity of foundation; after the sea is opened, continuously filling said weak clay layer with sandstone and mountain slope earth and rolling until the weak clay layer is reached to designed standard; finally, making upper portion building of island body.

Description

Technical field: [0001] The invention relates to a construction method for an artificial island of petroleum sand and gravel in a beach sea, in particular to a method for treating a quasi-preloaded foundation of an artificial island. Background technique: [0002] With the development of oilfield exploration, the shallow sea oilfield area has entered the development stage. Since the drilling and oil production equipment in the shallow sea area must be installed on artificial islands, the current technology for forming artificial islands cannot reach a satisfactory level. The current technology is suitable for beach soft soil foundation treatment. The methods mainly include the casing hole forming method and the preloading method. The casing hole-filled pile method has a short construction period, but the cost is relatively expensive. The preloading method is divided into two types in terms of construction methods: surcharge preloading and vacuum preloading. The vacuum prelo...

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Problems solved by technology

In order to accelerate the consolidation of soil and the subsidence of the foundation, the preloading method often inserts plastic drainage boards or drives sand wells into the foundation as an effective vertical drainage way, which can shorten the drainage distance and make the soil more stable in a relatively short period of time. Achieve a higher degree of consolidation and improve the bearing capacity of the foundation, but the cost of plastic drainage boards and sand wells are very high

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