不等轴双向拉应变下有纺织物孔径变化试验研究

唐琳; 唐晓武; 王艳; 白彬

doi:10.11779/CJGE201608023

不等轴双向拉应变下有纺织物孔径变化试验研究 English Version

1. 哈尔滨工业大学（威海）,山东威海 264209; 2. 浙江大学建筑工程学院滨海和城市岩土工程研究中心,浙江杭州310058; 3. 宁波大学建筑工程与环境学院,浙江宁波315000

基金项目: 山东省自然科学基金项目（ZR2015PE006）; 哈尔滨工业大; 学（威海）校科学研究基金项目（HIT（WH）201423）; 国家自然科; 学基金项目（51308310）; 哈尔滨工业大学科研创新基金项目

详细信息

作者简介:
唐琳(1986- ),女,讲师,主要从事土工合成材料和边坡工程等方面的教学和科研工作。E-mail: tanya_tang3@163.com。

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出版历程
- 收稿日期: 2015-07-27
- 发布日期: 2016-08-24

Experimental study on pore size characteristics of woven geotextiles subjected to unequal biaxial tensile strains

1. Harbin Institute of Technology at Weihai, Weihai 264209, China; 2. Research Center of Coastal and Urban Geotechnical Engineering, College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China; 3.Faculty of Architecture, Civil Engineering and Environment College, Ningbo University, Ningbo 315000, China

摘要

摘要: 有纺土工织物的孔径特征是反滤设计的重要指标。工程中有纺织物常处于不等轴双向受拉状态,引起孔径变化,导致织物反滤性能失效。采用数字图像法测试了不等轴双向拉应变下,3种条膜有纺织物的孔径参数变化,包括孔洞长宽比、开孔面积率、等效孔径（O₉₅）等。对比经纬向应变比2∶1,3∶1,4∶1对试验结果的影响,根据孔径特征变化规律,揭示不等轴双向拉伸引起孔径变化的机理。运用图像法试验结果,验证已推导的双向应变下开孔面积率及孔径理论解。试验结果表明：开孔面积率、等效孔径（O₉₅）均随双向拉应变的增大而增大。纬向应变相同时,经纬向应变比越大,孔洞形态（即孔洞长宽比）变化越大,开孔面积率及孔径变化的斜率越大。理论解较好地预测了开孔面积率及孔径的变化率及数值,孔径参数与双向拉应变呈现近似线性关系。但理论解的孔径计算以孔面积为指标,无法考虑应变比造成的孔形态变化对反滤作用的影响。
- 有纺织物 /
- 孔径特征 /
- 不等轴双向拉应变 /
- 孔洞长宽比 /
- 数字图像法
Abstract: The pore size characteristics are the important parameters in filtration design of woven geotextiles. The filtration applications are typically subjected to unequal biaxial tensile strains, which can cause variations of pore size characteristics and result in the failure of filtration engineering. The digital image analysis is adopted to test the variations of pore size parameters under unequal biaxial tensile strains of 3 slit-film woven geotextiles. The parameters include length-width ratio of pores, percent open area, and characteristics opening size O₉₅. The ratios of warp to weft strains are set to be 2∶1, 3∶1 and 4∶1. The analytical solutions of pore size parameters corresponding to the biaxial strains are compared with the experimental results. The results indicate that the percent open area and O₉₅increase with the tensile strains. The larger the ratio of warp to weft strain is, the larger the rate of the curves of pore size parameters is, and the larger the change of length-width ratio of pores. The analytical results correlate well with the experimental values and the rates of variations, and the pore size parameters change approximately linearly with biaxial tensile strains. And the calculation of pore size in the analytical solutions depends on the area of pores, neglecting the variation of the shape of pores.
- woven geotextile /
- pore size characteristic /
- unequal biaxial tensile strain /
- length-width ratio of pore /
- digital image analysis

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参考文献(15)

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