复合土工膜蠕变性能的试验研究

为了了解复合土工膜在长期荷载作用下的蠕变性能，对两布一膜土工合成材料的蠕变问题进行了4级荷载下的蠕变试验研究，通过理论分析建立了两布一膜土工合成材料蠕变方程。结果表明：两布一膜的蠕变特性与承受的荷载有关，当荷载越大，蠕变应变越大；在恒载长期拉伸作用下，两布一膜表现出很强的横向收缩特性，并且颈缩量的大小与荷载成正比；低于60 %极限荷载作用，材料强度仍然保持在70 %左右，可视为可靠而不影响工程的稳定性。

Experimental research on creep properties of composite geomembrane

Creep tests under four-step loading to predict long term creep behavior of composite geomembrane are examined. Based on theoretical analysis, a creep model for composite geomembrane is established, which shows the relationship between creep behavior of composite geomembrane and loading. The creep strain increases with the increase of loading. Under long term tensile dead load, the composite geomembrane presents strong lateral contraction property, and the necking magnitude is proportional to the load. When the material strength remains around 70 % under ultimate load less than 60 %; the material can be seen reliable, it has no influence on structural reliability.