【摘要】 悬挂式防渗墙是当前堤防加固工程中选用较多的一种堤基防渗方式。但由于悬挂式防渗墙未贯穿整个透水层,地下水可以通过防渗墙的底脚进行绕渗。绕渗量的大小与防渗墙的深度以及所在地层的渗透性相关。选用解析法,运用达西定律和等效渗透原理计算了松花江水位变化条件下,通过群力堤防渗墙非均质地层的渗流量,分析了悬挂式防渗墙深度与渗流量大小的相关关系。研究结果表明:不同方案下堤后排水系统的渗流量相差较大,当悬挂式防渗墙深度在16~24m,松花江处于洪水位,堤后强渗层底板高程为115.50m时渗流量最大,为3 202.8~3 639.7m3/d。研究结果不仅能够为工程建设提供参考,同时为更全面、合理地评价悬挂式防渗墙的效果提供理论支撑。更多还原

【Abstract】 A suspended anti-seepage wall is a kind of foundation seepage way frequently used in the embankment reinforcement project. Because the suspended anti-seepage wall does not breakthrough the permeable layer,groundwater flow can pass the foot of the anti-seepage wall. The bypass seepage quantity is related to the depth of the anti-seepage wall and the permeability of the formation. In order to determine the bypass seepage quantity in the heterogeneous formation in the Qunli dam of the Songhua River,we select the analytic method and use the Darcy’s law and the principle of equivalent permeability to calculate the seepage rate after the dam drainage system and examine the relationship between the depth of the suspended antiseepage wall and the infiltration flow under the changing conditions of water levels in the Songhua River and the depth of the anti-seepage wall. The results show that the infiltration flow appears big differences between different scenarios of the dam drainage system. When the depth of suspended anti-seepage walls is between 16 and 24 m,the Songhua River is in a flood water level. When the bottom level of the strong permeability layerafter the dam is 115. 50 m,the seepage rate is the maximum 3 202. 8 ~ 3 639. 7 m3/ d. The results provide not only a reference for the construction of the project,but also more comprehensive and reasonable theoretical supports to evaluate the effects of a suspended anti-seepage wall.更多还原