珊瑚土工程场地地震液化特征解析

doi:10.13722/j.cnki.jrme.2018.0835

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Abstract The paper presents a fundamental understanding of the liquefaction characteristics in the engineering sites of coralline soils and points out the key issues in the further research on liquefaction of coralline soils. The post-earthquake investigation of liquefaction damages in the engineering sites of coralline soils and comparison of knowledge obtained from the research on the liquefaction events of the terrestrial soils are conducted. The analysis indicates that the liquefaction destruction phenomenon of the coralline soils will be same as those of the terrestrial sites of sandy and gravelly soils when subjected to strong earthquakes，and it will even become the main cause of the seismic damage of the artificial islands and reefs. The PGA of 0.1 g is the minimum seismic intensity that triggers the liquefaction of coralline soils and the liquefaction may occurs in coralline fill layers or lagoon sediments. The coralline soils in the actual engineering sites are composed of a wide graded cohesiveless soils from gravel to silt instead of pure calcareous sand. It is discovered that the grain size distribution of liquefied coralline soils are similar to those of the liquefied continental gravelly soils. The layers of coralline soils with high shear velocity can liquefy and triggering the liquefaction of coralline soils with good permeability requires special burial conditions. As a result，the method for evaluation of the terrestrial sand liquefaction is not applicable to coralline soils. There is objective risk of strong earthquake in the area of South China Sea and the grain size distribution of the reclaimed coralline soils in the artificial islands. Moreover，reefs in the area is comparable to the liquefied coralline soils and gravelly soils in the historical earthquakes. The key issues to evaluate liquefaction risk of coralline soils are the reappearance of the liquefaction process of coralline soils in the laboratory，the technique of defining the density of the coralline soils in the field and the liquefaction discriminant technology for engineering sites of coralline soils.

Key words： Key words：soil mechanics coralline soils liquefaction gravelly soils coralline sand calcareous sand

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	Articles by authors
	YUAN Xiaoming1
	ZHANG Wenbin1
	2
	DUAN Zhigang3
	SUN Rui1
	WANG Yunlong1
	ZHANG Wei1

Cite this article:

YUAN Xiaoming1,ZHANG Wenbin1,2, et al. Analysis for characteristics of seismic liquefaction in engineering sites of coralline soils[J]. , 2019, 38(S2): 3799-3811.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2018.0835 OR https://rockmech.whrsm.ac.cn/EN/Y2019/V38/IS2/3799

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