Construction of Cutting Resistance Model for Excavating Hard Clay with Drag Suction Dredger

CCCC Tianjin Dredging Co., Ltd., Tianjin Key Laboratory for Dredging Engineering Enterprises, Tianjin, 300457, China

Abstract

Channel dredging is the key to the efficient operation of the water transportation system, and the drag suction dredger is an important type of engineering vessel in the field of hydraulic engineering dredging. The performance optimization of drag suction dredgers and the advancement of intelligent dredging technology have promoted the development of dredging technology. Intelligent technology has achieved significant results in the research and development of active rake heads and the optimization of construction processes. The mathematical model of cutting resistance is the foundation of intelligent technology research and development, but existing models are limited and mostly come from the field of agriculture; Although there is research and application of cutting results for typical soil in dredging projects, there is a lack of a hard clay cutting resistance model. Therefore, this article focuses on the hard clay in dredging projects, and studies the cutting resistance law of rake teeth through indoor underwater rapid cutting tests (considering different standard penetration counts, cutting angles, depths, and speeds). Combined with high-pressure flushing cutting tests to analyze the drag reduction effect, the influence law of cutting parameters is finally clarified, and a calculation formula for rake tooth cutting resistance is established.