含剧烈地震动作用不同埋深砂土液化判别统一公式

doi:10.13722/j.cnki.jrme.2020.1041

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Abstract The earthquake investigation and the engineering practice both show that it is necessary to develop reasonable liquefaction prediction methods in deep buried sand layers under the actions containing severe seismic ground motion for modern cities and major projects. Based on the survey on the recent liquefaction events and the analysis for the existing representative liquefaction prediction methods，a SPT-based unified discriminant model and the corresponding formula are proposed suitable for sand layers of different buried depths under the action containing the severe seismic ground motion. The proposed hyperbolic model has a consistent and unified expression for sand layers of different depths and conforms to the basic characteristics of the liquefaction critical line. The proposed model can adapt to the situations of shallow and deep sand layers as well as high and low seismic intensities and hence，is more reasonable than the existing models in China's codes and more advanced than the international CSR theory-based NCEER models with four sections along the depth. The new formula is approved by a large number of measured liquefaction data within sand layers of 30 m buried depth under PGA＜0.9 g，which overcomes the serious conservative disadvantages in the buried depth range of 10–20 m in China's codes and makes up for the vacancy of the discriminant methods for PGA＞0.4 g and the sand layers below 20 m in China's codes. The new formula also eliminates the unreasonable phenomenon of NCEER method that the critical boundary of liquefaction turns back when the buried depth of sand layers exceeds 10 m and overcomes the relatively conservative shortage of NCEER method under very strong and severe ground motion of 0.25 g＜PGA＜0.9 g. The proposed formula has been adopted in the revised version of the General Rule for Performance-based Seismic Design of Buildings with role model and can provide guidance and technical support for related specification revision and engineering application.

Key words： geotechnical engineering liquefaction prediction depth consistency model severe ground motion action hyperbolic model the general rule for performance-based seismic design of buildings

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	Articles by authors
	YUAN Xiaoming1
	FEI Yang1
	CHEN Longwei1
	YUAN Jinyuan1
	CHEN Tongzhi1
	2
	ZHANG Siyu1
	WANG Yide1

Cite this article:

YUAN Xiaoming1,FEI Yang1,CHEN Longwei1, et al. An unified formula for predicting sand liquefaction in different buried depths under severe seismic ground motion[J]. , 2021, 40(10): 2101-2112.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.1041 OR https://rockmech.whrsm.ac.cn/EN/Y2021/V40/I10/2101

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