填筑密实度对某均质土坝渗流及稳定性的影响分析

为分析填筑密实度对某均质土坝的影响,通过高密度电法检测结合钻探资料分析了坝体填筑缺陷,根据检测结果确定坝体不密实区域,采用数值方法计算了填筑密实度对大坝渗流及水位快速下降时稳定的影响。结果表明,该大坝表面存在雨水入渗通道并延伸至坝体内部,且在一定深度以下存在松散填筑土体,该松散区域的存在会削弱大坝整体防渗性能,抬高坝体浸润线,并在填筑密实度存在差异的部位产生过大的渗透坡降,且在水位骤降时上游坡抗滑稳定安全系数较小,滑移深度增大。

Influences of Filling Density on Seepage and Stability of Homogeneous Earth Dam

In order to analyze the influence of filling quality on a homogeneous earth dam, the filling defects of the dam were analyzed by high-density electrical method combined with drilling data. The non-compact area of the dam was determined according to the test results. The influence of filling quality on seepage and stability of the dam under the water level dropping rapidly was calculated by numerical method. The results show that there are rainwater infiltration channels on the surface of the dam and extend to the inside of the dam body. Loose filling soil exists below a certain depth. The existence of the loose area will weaken the overall seepage control performance of the dam, raise the saturation line of the dam body, and produce excessive seepage gradient at the interface between filling quality and inferiority. When the water level drops suddenly, the safety factor of anti-sliding stability of upstream slope is smaller and the sliding depth increases.