关键词: 强地震, 场地液化, 抗液化地基处理措施, 地基处理案例

Abstract: The successful cases about soil liquefaction mitigation are reviewed, in the sites of the 1989 Loma Prieta, USA earthquake, the 1993 Kushiro-Oki, Japan earthquake, the 1994 Hokkaido Toho-Oki, Japan earthquake, the 1995 Hanshin, Japan earthquake, the 1999 Chi-Chi, Taiwan earthquake, the 1999 Kocaeli, Turkey earthquake ,the 2001 Nisqually, USA earthquake and the 2011 great east Japan earthquake, and the applicability and performance of various mitigation measures are analyzed. The lessons we have learned from these successful cases of soil treatment include: (1) for bay areas or reclaimed lands, the ground treatments against soil liquefaction are indispensable; (2) the choice of soil liquefaction countermeasures should be based on the consideration of site conditions, economic conditions and the environmental conditions; (3) compacted sand piles and stone columns are widely used, which have become mature and economical technics, and they are suitable for improving liquefaction-prone soils in the seismic intensity VIII zone and below; (4) the dynamic compaction method is simple and less expansive, and this method is especially suitable for large fields in the seismic intensity VIII zone and below; (5) grouting, deep soil mixing and jet grouting methods are effective in mitigating the earthquake-induced liquefaction damages in the seismic intensity IX zone and below; 6) the combination of various liquefaction countermeasures is more effective than an individual measure. If possible, multiple methods should be used in combination to achieve better effects.

Key words: strong earthquake, site liquefaction, improved site methods to mitigate soil liquefaction, successful ground improvement cases