1. Excavation of hard clay: the water content of hard clay is low, high viscosity and hardness, and is not easy to collapse and excavation broken. It is difficult to excavate with bucket wheel head cutter, it is necessary to increase power to reduce the bucket wheel head speed, swing speed, shorten the forward distance, thin layer construction. When necessary, water can be flushed to increase the content of clay and reduce the difficulty of excavation.


  1. Excavation of loose sandy soil: loose sandy soil with small particle size, uniform, loose, easy to collapse. Excavation thickness can be larger to improve dredging efficiency. But the wear of sand on the bucket wheel cutter, pipeline, and machinery is more serious, in order to reduce the loss of machinery, water absorption can be increased to reduce wear. The bucket wheel cutter can be used at a low speed, and the fixed point and fixed suction operation methods are adopted according to the suction distance of the suction port and the thickness of the sand layer.


  1. Excavation hard plastic or plasticity clay: the soil is easy to collapse and back silting, the thickness of the construction layer can be larger, the excavation soil is easy to stick to the bucket wheel mouth, reduce the amount of wheel inclusion, make the bucket wheel cutter speed dropped, and gradually lose the bucket wheel cutter function, so it is necessary to clean up the blockage from time to time, or install high-pressure flushing equipment to wash the bucket wheel cutter head.