《Table 3 The monitored indexes of slurry during the whole trenching process》

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《Construction of an ultra-deep diaphragm wall: a case study》

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Notes:The specific gravity was tested by a mud hydrometer；the viscosity by a 700 m L funnel；the mass fraction of sand by a sand ratio meter；and PH by PH test paper.

The quality control of slurry is crucial to maintain the stability of the trench wall and poured concrete.Another purpose of quality control of the slurry is to make it recyclable，and thereby reduce the cost of mud disposal[24-25].However，as trench cutting processes，soil particles will be mixed up with the slurry，which thereby increases the unit weight and deteriorates the quality of the slurry.The deterioration rate of slurry could be greatly accelerated under the following circumstances:a) when trenching in sandy and silt layers，and b) during the cut of the secondary panel when the slurry is mixed up with massive Ca2+inherited from concrete overcutting.To maintain the slurry quality，strict management measures must be carried out.The key to maintain the slurry quality is to timely separate the sandy and rocky particles from the contaminated slurry.This is achieved by employing the Bauer BE-500 desanding system which removes the soil particles in three stages in a descending order of particle size（>0.06 mm，between 0.04 mm and 0.06mm，and between 0.026mm and 0.04mm）through the vibrating screen and cyclone.The largest processing capacity of the system can be up to 400 m3/h.The key indexes of slurry are tested during the trenching process.Table 3 gives the mean values of those indexes at different stages.The magnitudes of the indexes，including proportion of mud，viscosity，sand content and PH，are all within the practically reasonable ranges，which shows that the adopted mud separation system can satisfy the requirements of constructing the 110 m deep diaphragm wall.