水利水电科技进展Issue(1)：16-22,7.DOI:10.3880/j.issn.10067647.2015.01.003
高面膜堆石坝运行状态下土工膜双向拉伸力学特性--高面膜堆石坝关键技术（三）
Biaxial tensile mechanical property of geomembrane used as high membrane faced rockfill dam:key technology of high membrane faced rock-fill dam (Ⅲ)
摘要
Abstract
The geomembrane impervious barrier of hydraulic structure engineering is usually designed on basis of results of uniaxial tensile test. But geomembrane is actually in plain stress state in practical project. The principal stresses are in biaxial stress state. Two self-developed biaxial tensile devices and corresponding test methods were employed to investigate the mechanical property of geomembrane which is used as the surface barrier of high rock-fill dam. Several groups of tests with different biaxial tensile conditions were carried out for several geomembrane usually used in rock-fill dam. Then the experimental results were analyzed in contrast to that of conventional uniaxial tension tests. The mechanical property include tension strength, elongation, elastic modulus, Poisson' s ratio and true stress-strain relationship under different biaxial tension states were obtained. That revealed the stress-deformation properties and failure mechanism of geomembrane in actual working condition for rock-fill dam. The test results can provide some theoretical foundations and basis for the design and numerical analysis of geomembrane surface barrier of rock-fill dam.关键词
面膜堆石坝/土工膜/防渗体/双向拉伸试验/力学特性/应力应变关系Key words
membrane faced rock-fill dam( MFRD)/impervious barrier/geomembrane/biaxial tension test/mechanical property/stress-strain relationship分类
建筑与水利引用本文复制引用
吴海民,束一鸣,姜晓桢,任泽栋..高面膜堆石坝运行状态下土工膜双向拉伸力学特性--高面膜堆石坝关键技术（三）[J].水利水电科技进展,2015,(1):16-22,7.基金项目
国家自然科学基金(51079047,51379069) （51079047,51379069）
国家“十二五“科技支撑计划(2012BAB03B02) （2012BAB03B02）
