密实散体材料桩减轻液化触发微倾地层场地侧向变形研究

doi:10.13722/j.cnki.jrme.2017.0846

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Abstract

Liquefaction-induced lateral spreading in slightly sloped sites may result in serious earthquake damage，and the dense granular column is used to mitigate this kind damage. The influence of improvement ratios in the treated sites was focused in this paper，then this problem was studied by 2D-FEA，based on the calibration of soil parameters using centrifuge test and 2D-FEA(OpenSees). The research results shown that as below，a large lateral deformation happened within the liquefied soil in the slightly sloped sites，but lateral deformation of non-liquefied soil layers were much smaller，so liquefaction is the main reason for large lateral deformation. Installation of dense granular column can mitigate liquefaction-induced lateral deformation in slightly sloped sites obviously. Improvement effectiveness has a close relationship with displacement ratios，furthermore lateral deformation were decreased obviously as displacement ratios increased. Numerical simulation results shown that the lateral deformation tend to be a constant when depth of liquefied soil was more than 6 m and the displacement ratios was greater than 20%，it shown that there were different effective improvement depth with different displacement ratios，so the effective improvement depth should be calculated and checked when this method is used to improve slightly sloped liquefaction site，then determining the designing scheme.

Key words： soil mechanics OpenSees soil liquefaction centrifuge test dense granular column lateral deformation earthquake engineering

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	Articles by authors
	LI Ping
	ZHANG Yudong
	ZHANG Jianyi
	GU Junru
	ZHOU Chunshu

Cite this article:

LI Ping,ZHANG Yudong,ZHANG Jianyi, et al. Mitigation of liquefaction-induced lateral deformation in a slightly sloping stratum by dense granular column[J]. , 2018, 37(S2): 4320-4328.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2017.0846 OR https://rockmech.whrsm.ac.cn/EN/Y2018/V37/IS2/4320

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