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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