软岩料填筑面板堆石坝的流变和湿化效应研究

为了研究不同时期下软岩料流变及湿化效应对面板堆石坝的应力及变形影响。对比软岩料的流变和湿化模型,分析已有的软岩料流变、湿化效应的有限元实现方法。以某面板堆石坝为例,按大坝的不同时期和是否考虑流变、湿化效应制定了4种计算工况,分别进行大坝的三维有限元应力变形计算,通过对比分析4种工况的计算结果,系统总结了软岩料的流变、湿化效应对软岩料填筑面板坝在竣工期和蓄水期应力变形的影响规律。结果表明:无论是竣工期还是蓄水期,在考虑流变和湿化后,大坝横断面最大垂直位移、水平位移、大主应力均有显著的增加,但相对而言在蓄水期增加的更多。可见软岩料的流变和湿化效应对软岩料填筑面板坝应力变形有较大的影响,且在蓄水期影响更加明显。

Study on rheological and humidification effect of rockfill dam filled with soft rock

In order to study the effect of rheological and humidification effects of soft rock materials on the stress and deformation of face rockfill dam at different syages. The rheological and humidification models of soft rock materials were searched and compared, and the existing finite element method for the rheological and humidification effects of soft rock materials was analyzed and studied. Taking a face rockfill dam as an example, four calculation conditions were established according to different periods of the dam and whether rheological and humidification effects are taken into account, and then the three-dimensional finite element stress deformation of the dam was calculated respectively. Based on the calculation results of four working conditions, the influence laws of rheological and humidification effects of soft rock on the stress deformation of soft rock materials during the completion period and the water storage period of the rockfill dam filled with soft rock were summarized. The results showed that the maximum vertical displacement, horizontal displacement and main stress of the cross section of the dam increase significantly during the completion period and the water storage period, but increase more in the water storage period. It can be seen that the rheological and humidification effects of soft rock material have a great influence on the stress and deformation of soft rock material filling panel dam, and the influence is more obvious in the water storage period.