高密度聚乙烯复合土工膜性能的室内测试与评价

以高密度聚乙烯(HDPE)复合土工膜为试验材料,测定其物理、力学和水力学性能参数,运用数理统计方法分析各个参数的测定结果。试验结果表明,柔性壁渗透仪可以精确地测定复合土工膜的渗透性能参数。试验所用的60组复合土工膜,在0.1MPa渗透压时的渗透系数和0.6MPa下的耐静水压值均符合指数分布。复合土工膜试样的物理和力学参数测定结果符合正态分布,离散性差异较大。对于复合土工膜的测试评估,要有一定的样本容量,以便于利用统计参数来判断试样的质量优劣。测试结果可用于工程实践。

Laboratory determination and evaluation on the characteristics of composite geomembrane

Taking the high density polyethylene (HDPE) composite geomembrane as the test material, its physical, mechanical and the hydraulic performance parameters are determined. The determination results of each parameter were analyzed by using the mathematical statistics method. The experimental results indicate that the flexible wall Permeability Tester can test the penetration parameters of the composite geomembrane with high precision permeameter. For all the 60 groups of composite geomembrane used in the test, both the permeability under the 0.1MPa osmotic pressure and the static hydraulic pressure endurance values are in concordance with the exponential distribution. The physical and mechanical parameters of the specimen were tested, which obey the normal distribution with significant in dispersion. Thus, in order to evaluate the composite geomembrane, the sample sizes should be large enough to judge the quality of samples by statistical parameters. The experimental results can be used for engineering practice.