土工膜缺陷条件下渠道边坡渗流响应与稳定性分析OA

Geomembranes are widely used in canal lining anti-seepage systems,and their defects can alter canal seepage characteristics and further affect slope stability.Taking the power canal of HLJ Hydropower Station as the study object,a coupled seepage-stability analysis model for canal slopes is established based on field investigation and numerical simulation,to investigate the effects of geomembrane defect elevation,defect size,drawdown duration and foundation soil permeability on the seepage field and slope stability of the canal.The results show that:(a)under a constant normal operating water depth,the elevation of defect plays a dominant role in controlling the seepage field,and the defects closer to the canal bottom are more likely to induce concentrated leakage;(b)during water-level drawdown,the pore-water pressure and the phreatic line exhibit a pronounced lagged response to the changes in canal water level;and(c)the relative importance of the factors affecting slope stability follows the order of defect elevation>drawdown duration>foundation soil permeability>defect size.These results can provide a reference for defect identification,operation management,and stability assessment of canal anti-seepage systems.