Seismic liquefaction discrimination method for coral sandy site

Abstract

The invention discloses a seismic liquefaction discrimination method for a coral sand site, which takes essential characteristics and dynamic characteristics of coral sand into consideration, proposes a correction formula for a site in-situ standard penetration coefficient, and calculates the equivalent standard penetration impact number of the coral sand in combination with effective overlying stress of a soil body; thereby calculating equivalent acceleration according to the field acceleration and the overlying effective stress; and finally, the liquefaction judgment is carried out according to the equivalent standard penetration number and the equivalent acceleration. The method is a grading curve combined standard penetration liquefaction discrimination method, which comprises: firstly, performing primary judgment according to a gradation curve and a non-uniform coefficient of coral sand; and performing correction according to the measured standard penetration cardinal number, and performing secondary judgment according to the corrected standard penetration cardinal number and the soil equivalent acceleration.

Description

technical field [0001] The invention belongs to the fields of marine geological engineering, geotechnical engineering and port engineering, and relates to an earthquake liquefaction discrimination method for marine coral sandy sites. Background technique [0002] Coral sand is a special rock and soil mass widely distributed in tropical oceans, most of which are located between 30° north latitude and 30° south latitude, such as the Caribbean Sea, Hawaii, Polynesia, Indonesia, the Indian Ocean, the northern coast of Australia, and the Red Sea. There are also rich coral sands in the South my country Sea. [0003] Coral sand is essentially different from ordinary sand. Coral sand is mainly calcareous debris formed by long-term geological processes such as ocean movement after biological cementation of corals and shells. Because it is derived from biominerals such as coral shellfish, the shape of the particles is irregular, and the surface of the particles is porous and accompani...

AI Technical Summary

Problems solved by technology

However, under the condition of the same standard penetration number, the test shows that when the ordinary sand liquefies, the coral sand is far from reaching the start-up condition for liquefaction.

The current domestic and foreign seismic design codes do not have an earthquake liquefaction discrimination method specifically for coral sand

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