LIQUEFACTION DETERMINATION METHOD

Japanese Patent JP2015021355

A

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, energy δE, the ratio δT/δWD of an increase amount of the load W to an increase amount of the rotational torque T and the ratio δT/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.

SUEMASA NAOAKI
TANAKA TSUYOSHI
YANAGIURA YOSHIYUKI
CHIBA HISASHI
YAMATO SHINICHI
SUGANO YASUO
TAI HIDEMICHI

JP2013152475A

February 02, 2015

July 23, 2013

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NITTO SEIKO KK
SUEMASA NAOAKI
KISO JIBAN CONSULTANTS CO LTD
JAPAN HOME SHIELD KK

E02D1/02; G01N3/40

JP2009133164A	2009-06-18
JP2009133164A	2009-06-18
JP2010160067A	2010-07-22
JP2007321385A	2007-12-13

柳浦良行: "ＳＤＳ試験法を用いた安価かつ簡易な液状化判定法−地層、地下水位、ＲＬをサウンディングから直接求める方", 第２回ワークショップ説明資料, JPN6017019447, 22 July 2013 (2013-07-22), JP

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