Optimal Design of Block Quay Walls

Abstract

Block walls, consisting of stacked unreinforced prefabricated concrete blocks, are commonly used for the construction of quay walls in the presence of rocky subgrades. A traditional design of block quay walls is based on manual design iterations, envisaging sufficient safety against ultimate limit states (ULS) such as sliding, overturning or loss of bearing capacity of the foundation soil. In addition, the designer should consider stability during the different construction stages of the block wall, referred to as construction constraints. This design process can be laborious, while the resulting designs comprise a large volume of concrete. In order to optimize block quay walls, we developed an automated design procedure in the framework of gradient-based optimization, accounting for the various ULS and construction constraints encountered in engineering practice. The design checks for a block quay wall are first explained in detail. This includes global ULS requirements that apply to the block wall as a whole, and internal ULS requirements to consider sliding and overturning of separate blocks. During all construction stages, the block wall has to be stable, which imposes additional construction constraints. Block walls consisting of rectangular blocks and chamfered blocks are optimized. The resulting designs obtained with the automated design procedure satisfy all design requirements, and have a realistic layout. Furthermore, the influence of the different construction stages is studied, demonstrating the practicality of the proposed automated design procedure.

Implementation and evaluation of the underwater crack repair in the hollow concrete block of the gravity wharf

“…The block quay wall generally contains two types: solid and hollow concrete block. Concerning the solid concrete block quay wall, there are many researches have been done, such as Pitilakis and Moutsakis [18], Madanipour et al [19] and Francois et al [20]. Compared to the solid concrete block quay wall, the advantages of the hollow concrete block quay wall are the less usage of concrete and the use of local materials, e.g.…”