无纺织物单向拉伸孔径变化试验与理论预测对比分析  

Analytical prediction and experimental research on pore size of nonwoven geotextiles under unconfined uniaxial tensile strain

作　　者：唐琳[1] 唐晓武[2] 赵庆丽[1] 王艳[3] 白彬[2] 

机构地区：[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

出　　处：《岩土工程学报》2015年第10期1910-1916,共7页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(51308310);山东省自然科学基金项目(ZR2015PE006);山东省蓝色经济区工程建设与安全协同创新中心项目;哈尔滨工业大学(威海)校科学研究基金项目(HIT(WH)201423)

摘　　要：无纺织物作为反滤材料,常处于单向受拉工作状态。单向拉伸引起无纺织物孔径变化,易导致反滤工程失效。通过控制织物应变的干筛试验,定量测试了无侧限单向拉应变逐级增大的过程中,两种不同厚度短纤针刺无纺织物的孔径分布曲线变化。采用干筛试验结果,对现有两种体系的单向应变下无纺织物孔径预测理论解进行验证:一类是佘巍等效孔径O95理论解,一类是Rawal孔径分布曲线理论解。通过对比两种理论解对各级拉应变下的O95值预测,归纳二者的预测误差规律,从理论假设出发分析误差原因。同时采用前人图像法测得的热粘无纺织物O95变化验证两类理论解。两种理论解均能较好地预测无侧限单向拉应变下无纺织物O95的变化规律。O95随单向拉应变呈近似线性减小的规律。对于O95变化斜率的预测,佘巍解较准确,Rawal解偏大。对于O95数值预测可结合两类理论解给出变化范围。The filtration applications of nonwoven geotextiles are usually subjected to uniaxial tensile strain, resulting in the variation of pore sizes and failure of filtration engineering. The pore-size distributions of two needle-punched nonwoven geotextiles subjected to unconfined uniaxial tensile strains are measured by using the strain-controlled dry sieving tests. The experimental results of the dry sieving tests are compared with the predictions of two analytical solutions. One is the analytical solution of equivalent opening size O95 proposed by She Wei. The other is the analytical solution of pore-size distribution proposed by Rawal et al. The experimental values of O95 of two thermally bonded nonwoven geotextiles tested by previous studies are used to confirm the validity of the two analytical solutions. By comparing the predictions of O95, the accuracy and the error of two analytical solutions are analyzed. O95 decreases approximately linearly with unconfined uniaxial tensile strains. The prediction of the variation rate by She Wei is accurate, while that by Rawal et al. is larger than the experimental rate. The prediction of the value of O95 should be done considering the results of She Wei solution and Rawal solution.

关 键 词：无纺织物 无侧限单向拉应变 O95 孔径分布曲线 理论解 干筛 

分 类 号：TU43[建筑科学—岩土工程]