剪切波速评价饱和砂土抗液化性能研究

从三方面总结了用剪切波速评价饱和砂土抗液化性能的研究进展：基于现场震害调查的研究成果具有重要参考价值，但不便于开展系统研究；室内土样剪切波速的测试手段出现了弯曲单元和扭剪法两种新技术，与弯曲单元相比较，扭剪法更加可靠；剪切波速与抗液化强度相关性已通过大量的研究得到证实。指出要实现用剪切波速评价原位土层的抗液化性能需要解决：抗液化强度对于剪切波速的敏感性，如何进行地震等效，如何将原位与室内剪切波速建立联系以及如何选取区分不同土类的指标等4个问题。

Overview on Technique of Liquefaction Evaluation of Saturated Sand by Shear Wave Velocity

The paper summarizes the technique development about liquefaction evaluation of saturated sand in three aspects.The achievement of the research based on in-situ investigation of seismic site is very valuable but is limited by the date available as earthquake is uncontrollable and unpredictable.Two kinds of shear wave test-techniques of soil samples in lab have been developed in recent years;they are bend-elements and torsion wave test devices,by comparison,the torsion wave test device is more reliable than bend-elements.The correlation between shear wave velocity and cyclic liquefaction resistance has been verified by many researchers,which is extremely important to liquefaction evaluation of saturated sand by shear wave velocity.Four problems in this area to be solved are:1.how to deal with the sensibility of cyclic liquefaction resistance to shear wave velocity;2.how to correspond the random seismic load to the sinusoidal load applied in cyclic liquefaction test which is characterized by amplitude and fail number;3.how to correspond the shear wave velocity in lab to the in-situ value;and 4.what kind of parameter to Choose to describe different kinds of sand.