高面膜堆石坝土工膜夹具效应试验方法研究

Study on TestMethod of Geomembrane Clamping Effect for High Rockfill Dam

为了揭示不同锚固结构型式下,土工膜因夹具效应而变形乃至破坏的特性及机理,研制了一种面膜堆石坝夹具效应试验仪。试验仪可以模拟不同法向应力、不同垫层、不同锚固形式下,土工膜因夹具效应而被拉伸至不同距离的工况。试验仪能够在不破坏土工膜试样且不改变土工膜与垫层界面特性的情况下,通过观察窗与内窥镜阵列非接触测量手段,实时观测土工膜受拉状态。试验仪还可以进行多种优化方案的结构模型仿真试验,验证夹具效应优化方案效果。

In order to reveal the deformation and failure characteristics and mechanism of geomembrane due to the clamping effect under different anchorage structures,this paper developed a clamping effect test apparatus for geomembranes in rockfill dams.The test apparatus can simulate the working conditions of the geomembrane being stretched to different distances due to the clamping effect under different normal stresses,different cushion layers,and different anchoring forms.The apparatus can observe the stretched state of the geomembrane in real-time through non-contact measurement methods such as observation windows and endoscope arrays,without damaging the geomembrane sample or changing the interface characteristics between the geomembrane and the cushion layer.The test apparatus can also conduct structural model simulation tests for various optimization schemes to verify the effectiveness of the fixture effect optimization scheme.