基于孔压静力触探试验的土类指数共振法加固液化地基效果评价

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Abstract Combined with resonance theory，improvement of liquefiable foundation with cross-shaped vibration wing is conducted. Piezocone penetration tests are performed on the foundation before and after resonance improvement. It is shown that standards to assess the applicability of traditional vibro-compaction methods are not suitable to resonance method，since silts with fine content larger than 10% can be improved by resonance method. Nevertheless，the change of soil behaviour type index Ic，represents the variation of soil properties after improvement. Therefore，a criterion based on Ic is proposed to evaluate the applicability of resonance method. With results from standard penetration test performed on samples，relationship between Ic and clay content is promoted to determine the maximum clay content in soils to ensure the applicability of resonance method. Finally，variations of improvement to reduce liquefaction potential under different resonance schemes are studied. The reliability of criterion based on Ic is further confirmed. It is concluded that cohesionless soils with Ic＜2.40 or clay content less than 15% are suitable to be improved by resonance method. However，the effects of improvement are different depending on resonance schemes. Results show that the center of three resonance columns can be improved best，nest for the center of two resonance columns and routine points respectively. It is shown that resonance method expands the limitation of traditional vibro-compaction method，and can be spreaded in liquefiable foundation improvement.

Key words： soil mechanics piezocone penetration test(CPTU) resonance method soil behavior type index liquefiable foundation

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	Articles by authors
	ZOU Haifeng
	CAI Guojun
	LIU Songyu
	DU Guangyin

Cite this article:

ZOU Haifeng,CAI Guojun,LIU Songyu, et al. EVALUATION OF RESONANCE METHOD FOR IMPROVING LIQUEFIABLE FOUNDATION BASED ON CPTU SOIL BEHAVIOR TYPE INDEX[J]. , 2013, 32(s2): 4105-4114.

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https://rockmech.whrsm.ac.cn/EN/Y2013/V32/Is2/4105

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