Experimental Study on Waste Construction Slurry Treated with Rib-Prefabricated Horizontal Drains by Vacuum Preloading Methods
The traditional vacuum preloading method used to treat waste construction slurry.As there were some problems involving clogging and deformation of drain boards and vacuum attenuation in the traditional vacuum preloading treatment,a method of vacuum preloading with Rib-prefabricated horizontal drains(RPHD)was proposed to treat waste construction slurry.Five groups of indoor vacuum preloading model tests were performed to measure the pore water pressure,water discharge,vacuum degree and surface settle-ment of soil specimens during the reinforcement processes.Simultaneously,the filter membranes of drainage boards were scanned with electron microscopes to analyze the effect of rib width ratios of RPHD on consolida-tion of waste construction slurry.The test results indicated that RPHD could improve the vacuum transfer ef-ficiency and weaken the clogging of filter membranes of drainage boards during consolidation of waste con-struction slurry by the vacuum preloading method.A rib width ratio of 0.5 for ribbed drainage boards a-chieved the optimal performance of water discharge.The mean moisture content and the vane shear strength of treated soil specimens were respectively 38.51%and 32.38 kPa after reinforcement,which effectively im-proved the strength of reinforced soil.Analyzing the microstructure of filter membranes of drainage boards,it was found that the rib width ratio directly related the clogging of the ribbed drainage boards in the same width of drainage boards,and rib width ratio of 0.5 could fully play the drainage performance of RPHD.
vacuum preloadingrib-prefabricated horizontal drainrib-width ratiowaste construction slur-ryclogging effect
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