PVC土工膜双向拉伸试样优化研究

周天娥; 束一鸣; 吴海民; 张宪雷; 刘云锋; 郝雪航

doi:10.11779/CJGE2016S1011

PVC土工膜双向拉伸试样优化研究 English Version

1. 河海大学水利水电学院,江苏南京 210098;
2. 水文水资源与水利工程科学国家重点实验室,江苏南京 210098

基金项目: 国家自然科学基金项目（51079047,51379069,51409083）; 江苏高校优势学科建设工程项目（PAPD）

详细信息

作者简介:
周天娥(1990- ),女,湖北襄阳人,硕士研究生,主要从事高坝土工膜防渗结构研究。E-mail: 962905225@qq.com。

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出版历程
- 收稿日期: 2015-11-29
- 发布日期: 2016-03-24

Optimization of PVC geomembrane specimens for biaxial tensile tests

1. College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China;
2. State Key Laboratory of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China

摘要

摘要: 目前PVC土工膜双向拉伸力学特性试验研究主要采用普通十字型试样,其四肢为矩形,夹角处采用圆弧过渡,试样破坏时,中心区域可测得的最大真应变约为30%,远小于PVC土工膜在双向拉伸条件下能够达到的最大应变。为了获得更加完整的PVC土工膜双向拉伸应力-应变曲线,在原普通十字型双向拉伸试样的基础上,通过数值分析和试验验证相结合的方法对试样形状及尺寸进行了进一步优化,确定了加固哑铃型试样型式,并通过细部优化得到了该试样的具体尺寸参数;试验验证表明,该试样具有应力传递效果好、应力集中程度低、中心区（薄圆）应力值大且分布均匀的特点,试样破坏时测得中心区最大真应变达到100.4%,能够满足PVC土工膜双向拉伸力学特性试验研究的要求。
- PVC土工膜 /
- 双向拉伸试验 /
- 力学特性 /
- 应力-应变关系 /
- 试样优化
Abstract: The most common PVC geomembrane specimen used in biaxial tensile tests is a traditional cruciform one characterized by four rectangular clamp arms, intersection of which is connected by a corner fillet. Based on the traditional cruciform specimen, the maximum measured true strain in the central area can only reach 30%, which is far less than the prospective strain level under biaxial tension loads for PVC geomembrane. In order to get a more complete stress-strain curve of this material, a reinforced dumbbell-shaped specimen is designed on the basis of the traditional specimen by means of a coupled method of numerical simulation and experiment verification. The results of verification tests show that this new specimen presents high and evenly-distributed stress and low degree of stress concentration in biaxial tension states. The maximum true strain obtained at failure time can reach 100.4%, indicating that the reinforced dumbbell-shaped specimen can meet the demands of mechanical property research of PVC geomembrane under biaxial tension states.
- PVC geomembrane /
- biaxial tensile test /
- mechanical property /
- stress-strain relationship /
- specimen optimization

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参考文献(17)

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