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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摘要通过剖析近期大地震珊瑚土液化震害调查资料，对比陆相土液化研究成果，取得珊瑚土工程场地液化特征的一些基本认识，并指出珊瑚土液化研究的关键问题。分析表明：珊瑚土工程场地在遭遇强地震作用时会出现与陆相砂土、砾性土场地一样的液化及破坏现象，且会成为人造岛(礁)地震破坏的主因；地表峰值加速度0.10 g(地震烈度七度)为目前触发珊瑚土层液化的最小地震强度，液化可发生在珊瑚土吹填层或泻湖沉积物中；实际工程场地中的珊瑚土层为由砾到粉土的宽级配无黏性土组成，并非砂土，发现的已液化珊瑚土与已液化陆相砾性土的颗粒级配类似；高剪切波速珊瑚土层会发生液化，触发渗透性较好的珊瑚土层液化需要特殊埋藏条件，现有砂土液化判别方法不适于珊瑚土工程场地；我国南海地区岛礁工程存在遭遇强地震客观风险，且其珊瑚吹填土级配与历史地震液化珊瑚土和砾性土级配接近；珊瑚土场地液化风险研究的关键是珊瑚土液化性态的实验室复现、现场珊瑚土层密实程度界定技术和液化判别技术。

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	袁晓铭1
	张文彬1
	2
	段志刚3
	孙锐1
	汪云龙1
	张巍1

关键词 ：土力学, 珊瑚土, 液化, 砾性土, 珊瑚砂, 钙质砂

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

引用本文:

袁晓铭1，张文彬1，2，段志刚3，孙锐1，汪云龙1，张巍1. 珊瑚土工程场地地震液化特征解析[J]. 岩石力学与工程学报, 2019, 38(S2): 3799-3811.
YUAN Xiaoming1，ZHANG Wenbin1，2，DUAN Zhigang3，SUN Rui1，WANG Yunlong1，ZHANG Wei1. Analysis for characteristics of seismic liquefaction in engineering sites of coralline soils. , 2019, 38(S2): 3799-3811.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2018.0835 或 http://rockmech.whrsm.ac.cn/CN/Y2019/V38/IS2/3799

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