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采用大尺寸界面直剪仪对土工复合排水网与粗糙土工膜以及土工织物之间界面力学特性进行试验研究。试验发现,土工网芯较大地影响了含土工复合排水网衬里的界面剪切特性。对于挤压型土工膜/土工复合排水网界面,当正应力大于210 kPa时,土工网芯严重破坏了土工膜粗糙表面,导致其界面强度参数减少,峰值摩擦角从17.4°降低到8.6°。而对于土工织物/土工复合排水网界面,当正应力大于50 kPa时,土工网芯的嵌固作用较大地增加了犁沟分量,使其界面强度参数显著增加,峰值摩擦角从10.6°增加到21.3°。
The interface mechanical properties of geotextile composite drainage net, rough geomembrane and geotextile were tested by using large-size interface direct shear instrument. It is found that the geotextile core greatly affects the interfacial shear properties of the liner with geotextile composite drainage network. For the extruded geofilm / geocomposite drainage interface, when the normal stress is greater than 210 kPa, the geosynthetic network severely damaged the rough surface of the geomembrane, resulting in the decrease of interface strength parameters and the peak friction angle from 17.4 ° to 8.6 °. For the geotextile / geocomposite drainage network interface, when the normal stress is greater than 50 kPa, the embedded effect of geonet core increases the furrow component greatly and increases the interface strength parameter significantly, and the peak friction angle increases from 10.6 ° to 21.3 °.