Experimental Study on the Dynamic Characteristics of Municipal Subgrade Packing Modified by Fiber After Cyclic Load Freeze and Thawing
In order to study the dynamic stability of fiber binder modified municipal subgrade base packing(MSF),in this paper,the dynamic three-axial test is carried out under the long-term cyclic loading after freeze-thaw cycle,and the cumulative plastic strain(CPS)and the number of loading cycles(NLC)vary with fiber content,fiber length,addition of adhesive material and freeze-thaw cycle.The experimental results show that MSF has significantly improved CPS compared with unmodified base packing;the level of dynamic stress required for MSF failure increased with increasing fiber length and addition of binder material,with an optimal fiber length of 12 mm;after three and nine freeze-thaw cycles,the dynamic stress strength of the MSF increased by 1.9 times and 2.4 times compared with the unmodified fillers,respectively.
municipal roadbeddynamic characteristicscyclic loadfreezing and thawingfiber
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