Composite foundation structure and construction method suitable for lagoon, island and reef environment

Abstract

The invention discloses a combined foundation structure suitable for a lagoon face island-reef environment and a construction method thereof, and relates to the field of geotechnical designs and island-reef development. The combined foundation structure suitable for the lagoon face island-reef environment and the construction method thereof are suitable for coral lagoon geological conditions. The combined foundation structure suitable for the lagoon face island-reef environment comprises high-pressure jet grouting stabilization piles, a prefabricated caisson, lateral restraining high-pressure jet grouting piles, prefabricated bored sinking pipe piles and a prefabricated bearing platform, wherein the prefabricated caisson is located on the high-pressure jet grouting stabilization piles and in a curtain structure formed by the lateral restraining high-pressure jet grouting piles and is in rigid connection with the prefabricated bearing platform into a whole for collaborative bearing through the prefabricated bored sinking pipe piles. The combined foundation structure suitable for the lagoon face island-reef environment and the construction method thereof not only overcome the disadvantageous engineering characteristics of a coral lagoon foundation structure such as high structural performance, low bearing capacity and large deformation, but also bring the bearing capacity of each layer of rock and earth mass of the coral lagoon foundation structure into full play, have the characteristics of large rigidity, high bearing capacity and fast, excellent and economical construction and the like, have the advantage of adapting to construction in island areas, have broad application prospects, and make it possible to build an airport and other overhead reclamation engineering on a coral lagoon foundation.

Description

technical field [0001] The invention relates to the field of geotechnical engineering design and island reefs, in particular to a combined foundation structure suitable for lagoon-like island and reef environments and its construction method and construction method. Background technique [0002] The land area of ​​islands and reefs in the South China Sea is extremely small, and the landform is dominated by coral lagoons, which are surrounded by ring-shaped coral reefs or separated by dam-shaped coral reefs. Calcareous sand of 0-17m is distributed on the surface layer of the object, under which are fully weathered reef limestone layer, strongly weathered reef limestone layer and moderately weathered reef limestone layer. Calcareous sand retains the characteristics of coral biological skeleton, and has the characteristics of many pores, non-uniform, irregular shape, easy to break, poor particle cementation, and high compression; although calcareous sand has a high particle int...

AI Technical Summary

Problems solved by technology

The former can only be used for enclosure structures not bearing structures suitable for complex geological conditions near the sea; the latter composite foundation has the characteristics of bored piles, but does not have the effect of strengthening the foundation, so neither of them is suitable for heavy load foundations under the geological conditions of coral lagoons structure construction

[0004] In view of the fact that a single traditional infrastructure is difficult to meet the requirements of the airport's bearing capacity, deformation and quality in coral lagoon conditions

Images