As a novel backfill material,the fluid-solidified soil has the advantages of high fluidity,pumpability,thus eas-y to use in construction.The workability and mechanical properties of polypropylene fiber reinforced loess-based fluid-so-lidified soil were investigated.The enhancing mechanism of polypropylene fiber reinforced fluid-solidified soil was ana-lyzed.The results showed that the fluidity and bleeding rate of the mixture decreased with the increase of the content of polypropylene fiber,and the loss of fluidity decreased after 30 min when the content of polypropylene fiber was less than 1.25％.The optimum content of polypropylene fiber was 1.25％,and the 28 d flexural strength and compressive strength of fluid-solidified soil increased by 62.6％and 13.8％respectively.The enhancing effect,the interfacial friction,the adhe-sion and the formation of three-dimensional grid structure were found to be responsible for the enhanced mechanical strength of polypropylene fiber reinforced fluid-solidified soil.
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