棕丝纤维土拉压特性试验

Experimental study on tensile and compressive properties of palm fiber loess

为了研究棕丝纤维黄土的抗拉、抗压性能,采用正交试验设计法,研究了干密度、纤维长度、纤维掺量对黄土抗拉、抗压性能的影响。结果表明:在黄土中添加棕丝纤维能有效提高黄土的抗拉强度和抗压强度。各因素对抗拉强度、抗压强度的影响顺序依次为干密度、纤维掺量、纤维长度。干密度对抗拉强度的影响显著,纤维长度、纤维掺量对抗拉强度的影响不显著;干密度对抗压强度的影响最为显著,纤维掺量对抗压强度的影响一般显著,纤维长度对抗压强度的影响不显著。在干密度为1.71 g/cm3、纤维长度为30 mm、纤维掺量为0.6%时,抗拉强度和抗压强度达到最大值,分别为27.06和290.65 kPa。纤维对土的摩擦-黏聚作用、网兜作用和空间包裹作用共同构成了纤维土的强度。

In order to study the tensile and compressive properties of palm fiber loess,the effects of dry density,fiber length and fiber content were studied by orthogonal experimental design.The results show that adding palm fiber to loess can effectively improve the tensile strength and compressive strength of loess.The influence order of the factors on tensile strength and compressive strength is dry density,fiber content and fiber length.The effect of dry density on tensile strength is significant,but the effect on fiber length and fiber content is not significant.The effect of dry density on compressive strength is the most significant,and the effect of fiber content on compressive strength is generally significant,but the influence of fiber length is not significant.When the dry density is 1.71 g/cm3,the fiber length is 30 mm,and the fiber content is 0.6%,and the maximum tensile and compressive strength are 27.06 kPa and 290.65 kPa,respectively.The strength of loess is composed of the friction and cohesion of fibers,the action of netting and the effect of space wrapping.