等双轴拉应变对无纺土工织物孔径变化的影响

发布时间：2018-11-14 13:28

【摘要】：无纺土工织物作为一种反滤材料,在工程中常受土体作用产生平面双轴拉应变,导致织物孔径变化。基于无纺织物空间网络孔径模型,改进Rawal公式中织物孔径结构总层数的算法,并提出等双轴拉伸下织物孔径分布曲线的解析解。利用自主研发的双轴拉伸仪,将两种针刺无纺织物等双轴拉伸至应变为3%、5%、10%,采用应变控制下的干筛法,进行织物孔径分布曲线测试。将解析解与试验结果进行对比分析,解析解孔径值偏大,所得解析曲线与测试曲线对于较薄织物吻合更好。研究结果表明,随着双轴拉应变的增加,无纺织物孔径增大,其特征孔径O95、O50、O30都近似与拉伸应变呈线性变化关系。
[Abstract]:As a kind of filter material, non-woven geotextile is often subjected to the action of soil to produce plane biaxial tensile strain, which leads to the change of fabric pore size. Based on the spatial network aperture model of non-woven fabric, the algorithm of total layer number of fabric pore structure in Rawal formula is improved, and the analytical solution of fabric pore size distribution curve under equal biaxial tension is proposed. In this paper, two kinds of needle-punched non-woven fabrics were drawn to the strain of 5 / 10 by using the self-developed biaxial stretching instrument. The pore size distribution curve of the fabric was measured by dry sieve method under strain control. By comparing the analytical solution with the experimental results, the pore size of the analytical solution is larger, and the analytical curve is in better agreement with the test curve for the thinner fabric. The results show that with the increase of biaxial tensile strain, the pore size of the non-woven fabric increases, and the characteristic pore size O _ (95) O _ (50) O _ (30) approximately varies linearly with the tensile strain.
【作者单位】：浙江大学滨海和城市岩土工程研究中心;哈尔滨工业大学(威海);浙江大学航空航天学院工程力学系;
【基金】：国家自然科学基金资助项目(No.51179168) 中铁二院工程集团有限责任公司科研项目分项目资助(No.科2011-29) 国家“973”重点基础研究发展计划课题(No.2012CB719800) 哈尔滨工业大学(威海)校科学研究基金
【分类号】：TU531.7

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