The working efficiency and effect of sludge and waste soil treatment can not be ignored in the construction of sludge shield. At present, the main difficulties in sludge and waste soil treatment are as follows:
1. If the diameter of shield tunnel excavation is up to 15 m, the sludge water treatment capacity is large, the coordination difficulty is high in all aspects, and the mud pump load is too large, the mud water supply is insufficient on the excavation surface, or the processing capacity is insufficient. Therefore, reasonable equipment selection and sludge water site layout are very important. The formation of mud film is difficult in the long distance sand and gravel stratum with high permeability and high water pressure, which requires high pulping capacity, conveying capacity and