聚丙烯纤维红黏土渗透性与剪切特性试验研究

通过三轴压缩试验研究了聚丙烯纤维红黏土的渗透性与力学特性.击实与渗透试验结果表明,纤维含量变化时,纤维红黏土的最大干密度变化较小,而最优含水率变化较大.在0.25%～0.80%含量下,纤维红黏土可保持较低渗透性.三轴固结不排水试验结果表明,纤维红黏土的抗剪强度随着轴向应变增加而增大,具有典型的加工硬化特征,且随纤维含量与长度增加而增加,同时围压显著影响纤维红黏土的剪切特性.当纤维含量较小时,破坏模式为鼓胀型;当纤维含量较大时,尽管试样轴向应变较大,但未发生破坏.

Experimental study of permeability and shear behaviors of polypropylene fiber reinforced red clay

Using triaxial compression test,the mechanical behavior and permeability of polypropylene fiber reinforced red clay are studied.The compaction test and the permeability test results show that the fibers content has great effect on the optimum moisture content while has less effect on the max dry density.The permeability of fiber reinforced red clay keeps low level when the fibers content is 0.25%-0.80%.The results of triaxial consolidation undrained test show that the shear strength of fiber reinforced red clay increases with the axial strain and the work hardening character is expressed.The shear strength of fiber reinforced red clay also increases with the fibers content and fibers length.The confining pressure has remarkable impact on shear behaviors of fiber reinforced red clay.The fiber reinforced red clay has a bulging damage under low fibers content and it doesn′t induce fracture under high fibers content when the largest axial strain of samples appears.