本研究以新店砂作液化阻抗及最大剪力模數之探討，而試驗方法為動力三軸配合彎曲元件試驗。其中試驗控制的變因為前期反復荷重與細粒料含量。
研究結果顯示，隨著前期反復荷重的增加，試體之液化阻抗亦會增大，但若超過一臨界的前期反復荷重後，試體之液化阻抗則會開始降低。而此臨界前期反復荷重的門檻值隨不同細粒料含量而變動。
在本研究中，試體經前期反復荷重作用後，剪力波速並未有明顯的變化，主要是隨相對密度之不同而有所改變，顯示本研究所採用之前期反復荷重對試體之擾動，並未達到改變試體剪力波速之程度。

This research investigates the liquefaction resistance and the maximum shear modulus of Hsin-Dian sand by using cyclic triaxial tests together with bender element tests. The factors to be studied include previous cyclic loading and fines content.
Test results show that liquefaction resistance generally would increase with increasing previous cyclic loading up to a critical value, and then it would start decreasing with further increase of previous cyclic loading. The critical value of previous cyclic loading would change with different fines content.
In this research, the shear wave velocities of the samples presheared by cyclic loading did not change obviously. The shear wave velocity is influenced mostly by relative density. It indicates that the level of disturbance due to previous cyclic loading is not high enough to have obvious effect on the shear wave velocity.

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