土石坝坝面防渗膜中的夹具效应

对土石坝上游坝面防渗土工膜的夹具效应进行分析,用力学平衡法对膜的受力及与坝体的相对位移进行计算,论证了坝体与岸坡及坝基锚固处的土工膜存在夹具效应的可能性。用FLAC3D软件对整个坝体及坝面上的膜进行仿真数值模拟,结果表明,土石坝坝面防渗膜中确实存在夹具效应,且坝体与岸坡锚固处膜中的夹具效应比坝体与坝基锚固处明显。

Clamping effect in geomembranes used for seepage control of upstream surface of earth-rock dams

The stress of the geomembranes and their relative displacement with the dam body were calculated by use of the mechanical equilibrium method.It was verified that the clamping effect might occur in the geomembranes at the anchorage places of the dam body with bank slope and dam foundation.Then the software FLAC3D was employed for numerical simulation of geomembranes on the whole dam body and dam surface.The result shows that the clamping effect really exists in the anti-seepage geomembranes on the dam surface,and that the effect is more evident at the anchorage place of the dam body with bank slope than that at the anchorage place of the dam body with dam foundation.