| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a method for determining risk of liquefaction by an FL method, by estimating the dynamic shear strength ratio from a measured value by a rotational penetration test.SOLUTION: The method is provided for determining the liquefaction on the basis of the ratio of the dynamic shear strength ratio R and the earthquake time shear stress ratio L. As a calculation method of the dynamic shear strength ratio R, while gradually changing a load W applied to a penetration rod 4 having a screw point 4b, rotational torque T and a penetrating amount St are measured by a penetration test for rotatably penetrating the penetration rod 4, and an index Cp of indicating hardness of earth, energyδE, the ratioδT/δWD of an increase amount of the load W to an increase amount of the rotational torque T and the ratioδT/δSt of an increase amount of the penetration amount St to an increase amount of the rotational torque T, are defined as a test parameter on the basis of these measured values, and among these test parameters, at least one is set as an explanation variable, and an object variable is set as the dynamic shear strength ratio R, and the dynamic shear strength ratio R is estimated and determined by a regression equation determined by executing a multiple regression analysis.</p> |
