密实粉土单耙齿及三耙齿水下切削试验及耙齿切削阻力计算

滨州港分布的回淤性密实粉土含水量低、标贯击数大、坚硬难挖,给疏浚施工带来很大的麻烦,特别是对耙吸船的挖掘提出挑战,影响了施工效率。为了研究密实粉土的切削机理,进行了密实粉土的切削试验研究。对3种含水量的密实粉土在不同切削角、不同切削深度和不同切削速度的工况下进行了单耙齿和三耙齿水下切削试验,并进行了高压冲水条件下的切削试验研究。试验过程中,通过刀具上布置的切削力传感器监测切削力。通过密实粉土切削试验得到了密实粉土的破坏特性,总结了密实粉土切削的特点,并根据试验数据建立密实粉土耙齿切削阻力计算经验公式。

Underwater cutting experiment and cutting resistance calculation of single draghead tooth and three draghead teeth in dense silt

The silting dense silt distributed in Binzhou Port has low water content and large SPT(N),and is hard and difficult to dig,which brings great trouble to the dredging construction,especially challenges to the digging of trailing suction hopper dredgers,and affects the construction efficiency.In order to study the cutting mechanism of dense silt,the cutting experiment of dense silt has been carried out.Under the conditions of different cutting angles,different cutting depths and different cutting speeds,single draghead tooth and three draghead teeth underwater cutting experiments are carried out for three kinds of dense silt with water content,and the cutting experiments under high-pressure flushing are been carried out.During the experiment,the cutting force is monitored by the cutting force sensor arranged on the cutting tool.Through the cutting experiment of dense silt,the damage characteristics of dense silt are obtained,and the cutting characteristics of dense silt are summarized.According to the experimental data,the empirical formula for calculating the cutting resistance of dense silt rake is established.