基于硬质黏土切削理论的耙齿切削阻力分析

Cutting resistance analysis of draghead teeth based on hard clay cutting theory

耙头在挖掘硬质黏土时,耙齿切削阻力较大,需要匹配的主机负荷也相应增加,使得工程经济性降低。为了分析硬质黏土切削过程中耙齿切削阻力的大小及变化趋势,优化耙头设计和使用工艺,对一定含水率和标贯击数的硬质黏土进行多工况下耙齿水平和垂直切削阻力计算。通过计算模型对2种耙齿切削过程中土体破坏长度和宽度进行计算。结果表明:硬质黏土水平切削阻力受切削深度、切削角度和切削宽度影响较大,受切削速度影响较小;进行硬质黏土切削时,需根据实际工况选择不同类型耙齿。该切削理论计算模型可用于耙头设计和施工工艺参数优化,为船舶施工效率的提升提供了一种理论参考。

When the draghead excavates hard clay,the cutting resistance of the teeth is large,and the load of the main engine that needs to be matched is also increased correspondingly,which reduces the engineering economy.In order to analyze the value and change trend of the cutting resistance of the teeth in the cutting process of hard clay,and optimize the design and use of the draghead,we calculate the cutting resistance of teeth under multiple working conditions on the hard clay with a certain water content and standard penetration number,and calculate the length and width of soil damage during cutting by the calculation model.The results show that the horizontal cutting resistance of hard clay is greatly affected by the cutting depth,cutting angle and cutting width,and less affected by the cutting speed;when cutting hard clay,different types of teeth must be selected according to the actual working conditions.The cutting theoretical calculation model can be used for draghead design and construction process parameter optimization,which provides theoretical reference for the improvement of ship construction efficiency.