Large-scale model test investigation on self-weight consolidation and low vacuum loading process of construction waste slurry

In view of the high water content of construction waste slurry produced by a site in Hangzhou, with large foundation and slope engineering model test apparatus for experimental platform, the self-weight consolidation and low vacuum loading process of construction waste slurry are investigated experimentally, the variation of slurry surface settlement and the development of pore water pressure in the this process are studied, and the water content of slurry after low vacuum loading is also discussed. The results show that after self-weight consolidation and the low vacuum loading process of slurry, the average settlement reaches 314 cm, the average water content decreases from 255.6% to 115.9%, the average void ratio decreases from 6.72 to 3.04, and the volume reduction reaches 47.6%. These results indicate that the low vacuum loading treatment of slurry has certain engineering feasibility. During low vacuum loading process of slurry, the "vacuum pressure drop" occurs when the vacuum pressure is transferred from the sand cushion under the geotextile to the slurry layer. The low vacuum loading method can strengthen the bottom slurry well, and the following step should focus on dewatering treatment of the upper slurry.