单耙齿切削黏土机理试验研究

Experimental study on mechanism of clay cutting by single rake tooth

黏土是疏浚工程中分布广泛且较为难挖的土质。为了分析黏土切削过程中的土体破坏机理,对2种不同含水率的黏土进行二维与三维切削试验研究。试验考虑不同切削角度(30°、45°和60°)和不同切削深度(50、100和150 mm)对黏土切削力的影响。通过切削力传感器测得切削过程产生的水平和垂直切削力;并在切削刀具表面不同位置布置压力传感器,测得切削过程中刀具不同位置受到的土体压力;布置摩擦力传感器,测得切削过程产生的摩擦力;在切削过程中观察土体的变形和破坏形态。通过黏土的切削试验,讨论不同的切削参数对黏土切削力的影响,分析黏土切削的土体破坏机理。

Clay is a soil that is widely distributed and difficult to cut in dredging engineering.To analyze the mechanism of soil failure during clay cutting,we carry out two-dimensional and three-dimensional cutting experiments on the cutting of clay with different water contents,considering the effects of different cutting angles(30°,45°and 60°)and different cutting depths(50,100 and 150 mm).The horizontal and vertical cutting forces generated in the process of cutting are measured by a cutting force sensor;pressure sensors are arranged at different positions on the surface of the cutting tool,and the soil pressure received at different positions of the cutting tool during cutting is measured;a friction sensor is arranged to measure the friction generated in the process of cutting;and the deformation and failure modes of the soil during clay cutting are observed.Based on the cutting experiment,the influence of different cutting parameters on the cutting force of clay is discussed and the mechanism of soil failure in clay cutting is analyzed.