人工合成类废布料纤维纱加筋黄土力学变形性质及抗溅蚀特性试验研究

Experimental study on mechanical deformation and corrosion resistancecharacteristics of loess reinforced with synthetic waste cloth fiber yarn

纺织企业每年都产生大量的人工合成类废弃布料,处理不当会造成比较严重的环境污染。将废弃布料开松、分梳和切断后具有良好抗酸碱腐蚀性能的涤纶纤维纱按一定比率掺入素黄土中,形成纤维纱加筋黄土试样。用路面材料强度试验仪、真三轴试验仪、抗拉强度仪和土壤溅蚀设备对素黄土、单丝纤维加筋黄土和纤维纱加筋黄土试样进行相关测试。试验结果表明,随着纤维纱掺加比率的增加,无侧限抗压强度呈先增大后减小的变化趋势,最优纤维掺加比率,纤维纱加筋黄土及单丝纤维无侧限抗压强度均大于素黄土,在相同的纤维掺加比率、细度及长度条件下纤维纱加筋黄土无侧限抗压强度大于单丝纤维加筋黄土;纤维纱加筋黄土黏聚力c值大于单丝纤维加筋黄土及素黄土,内摩擦角ψ值与单丝纤维加筋黄土及素黄土比变化不明显;素黄土在抗拉强度测试中呈现脆性破坏特征,纤维纱的加筋黄土抗拉强度大于单丝纤维加筋黄土及素黄土,纤维纱加筋黄土破坏时拉应变大于单丝纤维加筋黄土;相同的时间节点纤维纱加筋黄土击溅后形成的坑洞孔深小于素黄土,同时溅蚀量较素黄土更少。

Textile companies produce a large number of synthetic waste fabrics every year,and improper handling can cause serious environmental pollutions.The discarded fiber yarn is used to form a fiber yarn-reinforced loess sample by loosening,combing,and cutting into the plain loess at a certain ratio.Related tests were carried out on plain loess,monofilament fibre-reinforced loess and fiber yarn-reinforced loess samples by using pavement material strength tester,true triaxial apparatus,tensile strength tester and soil erosion equipment,respectively.The results showed that when the fiber yarn blending ratio increases,the unconfined compressive strength increases first and then decreases,which indicates the optimal fiber doping ratio is found.For the unconfined compressive strength,fiber yarn-reinforced loess and monofilament fibre-reinforced loess are larger than plain loess.Under the same fiber blending ratio,fineness and length,the unconfined compressive strength of fiber yarn-reinforced loess is more significant than that of monofilament fiber-reinforced loess.The cohesive strength of fiber yarn-reinforced loess is greater than those of monofilament fibre-reinforced loess and plain loess;while the internal friction angle of these three loesses is similar.Plain loess exhibits brittle failure characteristics in the tensile strength test.Tensile strength of fiber yarn-reinforced loess is higher than those of monofilament fiber-reinforced loess and plain loess.Tensile strain of fiber yarn-reinforced loess is larger than that of monofilament fiber-reinforced loess.At the same time point,the pores formed by the fiber yarn-reinforced loess are smaller than the plain loess,and the amount of erosion is less than that of plain loess.