Abstract
“ Lattice grid foundation” was developed as new shore protection works. The main concern of this technique is reducing settlement due to undermining of structure and scattering of concrete armor blocks. Prediction of the settlement is important for designing shore protection facilities. Therefore, settlement of detached breakwaters and revetment in Hokkaido and Kagoshima had been measured. In addition, laboratory experiment had been conducted to clarify the characteristics of settlement of lattice grid foundation and other shore protection works. Then, empirical equations to estimate settlements of lattice grid foundation in field and laboratory were developed. The workability was also studied compared to other method.
From the field observation and laboratory experiments, the settlement of lattice grid foundation increased rapidly at the beginning of installation, and then gradually becomes slow. It finally reaches to near-equilibrium condition. The empirical equation estimating settlement of the structure can be applicable for future shore protection project.
