摘要
自航耙吸挖泥船在疏浚饱和硬质土时,耙齿贯入困难,切削阻力大,使得疏浚浓度较低,极大地影响了施工效率和经济效益。为了更好地设计和优化切削过程,提高耙头的施工效率,通过模型试验的方法,综合考虑耙齿类型、负载、航速、不同位置高压冲水等因素的影响,研究不同工况下的原型耙齿切削过程,探讨切削阻力、切削深度、切削宽度等与这些因素之间的关系。结果表明:饱和硬质土切削过程中,纯机械切削的作用有限,且切削阻力很大;只有辅以各种高压冲水,才能大幅增加切削深度,显著降低切削阻力。该模型试验的成果可直接用于指导耙头的优化设计和对现有耙头的改进,以进一步提高耙头疏浚饱和硬质土的施工效率。
When saturated hard compacted soil is dredged by trailing suction hopper dredger （TSHD） , its high intensity will lead to an undersized cutting depth and a large cutting resistance. Thus, low concentration slurry often occurs in dredging process and significantly influences the working efficiency and economic benefits of TSHD. For optimizing design of the cutting process, and improving working efficiency of draghead, we tested cutting process with draghead teeth by model experiments under different conditions, including various teeth, loads, navigating speeds and high-pressure jets, and discussed their effects on cutting depth, width and resistance. The results showed that the function of mechanical excavation is limited in cutting this soil. But when assisted with various jets, the draghead will excavate more soil with a significantly reduced resistance. These results could be directly used in guiding the design and optimizing of draghead for further improving its working efficiency in dredging hard compacted soil.
出处
《水运工程》
北大核心
2008年第8期98-104,共7页
Port & Waterway Engineering
关键词
自航耙吸挖泥船
耙齿
饱和硬质土
切削
高压冲水
trailing suction hopper dredger （DSHD）
draghead teeth
saturated hard compacted soil
cutting
high-pressure jets
