新西兰基督城地震宏观液化特征及宏观液化等级

Macro-characteristics of liquefaction and maro-liquefaction class of the 2011 Christchurch earthquake,New Zealand

2011年新西兰基督城地震液化造成了巨大的破坏和经济损失,导致部分城区废弃,其液化现象十分显著,在世界各地的地震液化破坏中实属罕见,因此,深入研究此次地震液化对于进一步探究地基液化有着非常关键的作用。文中介绍了新西兰基督城地震中场地的宏观液化现象,并搜集整理地震场地地质调查数据,包括地下水位、地震动强度、地震破坏烈度、饱和砂层埋深以及标贯击数等宏观特征参数,通过对数据的整理和分析,给出该地震液化场地宏观液化指数,判定宏观液化等级。

The 2011 Christchurch earthquake,New Zealand,directly caused tremendous damage to engineering structures and generated huge economical loss,and made some areas of the city abandoned.Through filed investigation,the extensive liquefaction phenomena were observed and contributed to the main cause of the earthquake damage.To investigate the liquefaction issues induced by this earthquake plays a very crucial role in liquefaction study.By collecting large numbers of liquefaction data,including ground water table depth,PGA,seismic intensity,saturated sand layer burial depth,and SPT values,the macro-characteristics of the liquefaction are studied.The correlation of the characteristic parameters with liquefaction is explored.Using the macro-liquefaction classification criteria,the macro-liquefaction class in Christchurch earthquake is given.The analytical results obtained can provide a reference for liquefaction study and to improve liquefaction evaluation methods.