2024 年 11 巻 6 号 p. 175-179
A modernized city like Tokyo has a weakness in that its aging buildings lack seismic resistance. Cement-based ground improvement, which provides a high degree of flexibility in strength, has been used for a variety of purposes, including temporary applications such as tunneling support, excavating support, and permanent applications such as liquefaction countermeasures, a spread foundation, a foundation reinforcement for damaged piles. The design and evaluation of ground improvement have been investigated and researched by various researchers and engineers, for the understanding of physical and mechanical properties. In such efforts, unconfined compression strength has been used as a criterion for design and evaluation for quality of ground improvement. However, there is not enough knowledge of the dynamic properties (shear wave velocity) of cement-mixed soils and scale effect in the strength of small specimens and full-scale large specimens. From the above background, we discuss the dynamic properties and scale effect of cement-mixed soils prepared in a laboratory with reference to previous findings and the data obtained in this study.
