Model tests on geosynthetic‑encased construction concrete debris column in fly ash fill

摘要

Providing geosynthetic-encased stone columns is a commonly adopted technique to improve the load-carrying capacityand reduce settlements in weak fills. Addressing the geo-environmental aspect, two different waste materials, i.e., fly ashand concrete debris, have been used for the sustainable environmental management. This paper presents a series of modeltests results carried on single unencased and geosynthetic-encased construction concrete debris (CCD) column installed infly ash fill under short-term loading. Footing size was taken as twice the column diameter for 25% area replacement ratio.Two sizes of columns, 50 mm and 75 mm diameter, have been used for both end-bearing and floating end conditions. Theresults were analyzed in terms of bearing capacity ratio and settlement ratio. Experimental model tests clearly show thatcircumferential geosynthetic encasement greatly influences the ultimate load-carrying capacity of CCD column and reducessettlement of treated fly ash fill bed.