Experimental Study On Consolidation Of Engineering Waste Slurry By Vacuum Preloading With Ribbed Drain

After decades of research and development,vacuum preloading has become an efficient and economical reinforcement method for soft soil foundation engineering.However,its accompanying shortcomings cannot be ignored.In view of the problems of silting around the drain,deformation and poor overall strength of the soil after consolidation in the process of consolidation of ultra-high water content soft soil by the traditional vacuum preloading method,the vacuum preloading method of ribbed drain is proposed to treat the engineering waste slurry.Through indoor model test and improvement,the consolidation mechanism of vacuum preloading method for ribbed drain is preliminarily explored.1.A new type of drainage board named ribbed drain was designed by modifying the drainage board,and the indoor vacuum preloading model test was carried out.The results show that the ribbed drain can effectively alleviate the siltation,improve the drain and consolidation effect of engineering waste slurry and improve the vacuum transfer efficiency.Compared with the traditional vacuum preloading,the vacuum degree of the remote soil mass increased by4 k Pa,the shear strength of the soil mass increased by 5.4k Pa,the displacement increased by22.61%,and the deformation of the drainage plate was also improved.2.Ribbed drain has the best rib width ratio.Without increasing the amount of drain,the rib width ratio has a greater impact on the consolidation effect of vacuum preloading engineering waste slurry for ribbed drain.The rib width ratio is too small,the effect of alleviating siltation is limited;the rib width ratio is too large,the influence range of the ribbed drain will be reduced.When the rib width ratio is 0.5,the performance of the ribbed drain is the best.3.The lime flocculation combined with vacuum preloading method of ribbed drain is used for engineering waste slurry consolidation.Its lime layer can improve the permeability of soil,increase the drainage channel inside the soil,and further improve the performance of ribbed drainage plate.Compared with no lime added,pore water pressure dissipates 19.87% more and settlement is 30.65% more...