NGHIÊN CỨU ỔN ĐỊNH ĐÊ TRỤ RỖNG TRÊN NỀN ĐẤT YẾU CHỊU TẢI TRỌNG PHỨC TẠP ĐỨNG, NGANG VÀ MÔ MEN

Abstract

Hollow cylinder breakwater for dissipating wave energy and protecting the shoreline was first researched, applied and successfully built (180 m) in Vietnam in April 2017. This type of breakwater has many advantages such as the ability to dissipate the waves, reduce pressure acting on the structure so enhancing the stability and service life compared to vertical seawalls. The hollow cylinder breakwaters are manufacture in the factory and easily assembled on sites that help to ensure construction quality and reduce implementation time. This paper presents a method for calculating the stability of the hollow cylinder breakwater using the limit load boundary line in case the structure bears vertical, horizontal loads and moment by either increasing or decreaseing the height of rockfill inside the breakwater. When the height of rockfill increases, the vertical load acting on the ground increases leading to increases in horizontal load and moment bearing capacity for ensuring the stability of the hollow cylinder breakwater. A finite element method is used to analyze the settlement of the pilot 180 m breakwater constructed in Ca Mau. It is found that the monitoring data shows a good agreement with the calculated settlement using the finite element method given the suitable selection of model parameters.