EVALUATION METHOD OF GROUND IMPROVEMENT EFFECT BY CHEMICAL INJECTION METHOD

Japanese Patent JP2023027617

A

To provide an evaluation method of a ground improvement effect which can evaluate uniaxial compression strength of an improvement body by measuring an electric specific resistance after improvement.SOLUTION: An evaluation method of a ground improvement effect by a chemical injection method comprises first to third steps. In the first step, a first correlation diagram of silica concentration (SiO2) and uniaxial compression strength (qu) is obtained and a second correlation diagram of silica concentration (SiO2) and electric specific resistance (R) is obtained in advance. In the second step, a target silica concentration (SiO2) is obtained from a target uniaxial compression strength (quck) based on the first correlation diagram and a target electric specific resistance (Rk) is set from the target silica concentration (SiO2) based on the second correlation diagram. In the third step, an electric specific resistance (Rimp) by an electric logging is measured using a penetration hole vertically formed in a ground after ground improvement, and it is determined whether the target uniaxial compression strength (quck) is secured according to whether a condition that the electric specific resistance (Rimp) of the improved ground is equal to or less than the target electric specific resistance (Rk) is satisfied.SELECTED DRAWING: Figure 1

SHIMOZAKA KENJI
MURATA YOSHINOBU
KARIYA KEIZO
YASHIMA ATSUSHI
HANADA YUKI
YAMAMOTO KEIGO
ONO YASUTOSHI
ITO TAKAYOSHI

JP2021132839A

March 02, 2023

August 17, 2021

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TODA CONSTRUCTION
NPO JIBAN BOSAI NETWORK
TAIYO KISO KOGYO KK

E02D3/12; E02D1/08

Hisashi Izumi

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