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Experimental Research on Dynamic Shear Modular Ratio and Damping Ratio of Sandy Gravel Soil
Wang Xiaojun,Zhao Fengxin,You Hongbing,Nie Dawei
作者单位E-mail
Wang Xiaojun Shaanxi Earthquake Agency, Xi'an 710068, China  
Zhao Fengxin China Earthquake Disaster Prevention Center, Beijing 100029, China  
You Hongbing China Earthquake Disaster Prevention Center, Beijing 100029, China hbyou@126.com 
Nie Dawei Shaanxi Earthquake Agency, Xi'an 710068, China  
摘要:
The dynamic shear modulus ratio and damping ratio of sandy gravel are important parameters for the seismic response analysis of valley geomorphic sites, which have an important impact on the determination of design ground motion parameters. In this paper, the dynamic triaxial test of sandy gravels has been performed based on the project of the Shangluo Seismic Microzonation. Combined with the other results of sandy gravel, the recommended results of slightly dense, medium dense and dense sandy gravel were obtained. By building the typical site model, the influence of the dynamic shear modulus ratio and the damping ratio uncertainty on the seismic response of the site is studied. The results show that the uncertainty of the average of the dynamic shear modulus ratio and the damping ratio ±1 times the standard deviation has little effect on the peak acceleration of the sandy gravel site, and the rationality of the grouping and statistical results is explained. Under different probability levels, the change in the shear modulus ratio and damping ratio leads to a significant difference in the high frequency response spectrum. The response spectrum of 0.04-0.1s ranges from about 20%, but it has little effect on the long period spectrum of more than 1.0s. The study of dynamic shear modulus ratio and damping ratio of sandy gravel has the ability to improve the reliability of the designing ground motion parameters.
关键词:  Sandy gravel  Dynamic shear modular ratio  Dynamic damping ratio  Uncertainty  Seismic response analysis of site
DOI:
分类号:
基金项目:This project was sponsored by the Earthquake Disaster Prevention and Reduction Program for the 12th "Five-year Plan" of Shaanxi Province (SCZC2012-TP-905/1).
Experimental Research on Dynamic Shear Modular Ratio and Damping Ratio of Sandy Gravel Soil
Wang Xiaojun,Zhao Fengxin,You Hongbing,Nie Dawei
Abstract:
The dynamic shear modulus ratio and damping ratio of sandy gravel are important parameters for the seismic response analysis of valley geomorphic sites, which have an important impact on the determination of design ground motion parameters. In this paper, the dynamic triaxial test of sandy gravels has been performed based on the project of the Shangluo Seismic Microzonation. Combined with the other results of sandy gravel, the recommended results of slightly dense, medium dense and dense sandy gravel were obtained. By building the typical site model, the influence of the dynamic shear modulus ratio and the damping ratio uncertainty on the seismic response of the site is studied. The results show that the uncertainty of the average of the dynamic shear modulus ratio and the damping ratio ±1 times the standard deviation has little effect on the peak acceleration of the sandy gravel site, and the rationality of the grouping and statistical results is explained. Under different probability levels, the change in the shear modulus ratio and damping ratio leads to a significant difference in the high frequency response spectrum. The response spectrum of 0.04-0.1s ranges from about 20%, but it has little effect on the long period spectrum of more than 1.0s. The study of dynamic shear modulus ratio and damping ratio of sandy gravel has the ability to improve the reliability of the designing ground motion parameters.
Key words:  Sandy gravel  Dynamic shear modular ratio  Dynamic damping ratio  Uncertainty  Seismic response analysis of site