基于GeoStudio的北江大堤坝基瞬态渗流分析

Transient Seepage Analysis of Beijiang Levee Foundation Based on GeoStudio

渗流稳定是影响堤坝工程安全的核心问题,忽视渗流问题可能发生滑坡、管涌等破坏,危及大堤的安全。该文采用GeoStudio有限元分析软件,以北江大堤工程为实例建立有限元渗流场计算模型,研究分析稳态、瞬态以及不同水位对多层堤基渗流特性的影响。结果表明,渗流主要集中在距离地面20m处的强透水层,外江水位达到8.7m及以上时,随着水位的上升渗流量也增加,水位超过10m时渗流量增加幅度更大。在瞬态渗流时,渗流量随水位、时间的增加而增大,当水位达到15.78m时堤坝可能发生渗流破坏。此外,基于分析结果对堤基、堤身、岸坡等重点部位提出了合理的防渗措施,为北江大堤工程渗流安全评价提供参考,有效保障了大堤的安全。

Seepage stability is the core issue affecting the safety of embankment engineering.The neglect of seepage may cause landslide,piping and other damage,endangering the safety of the embankment.In this paper,GeoStudio finite element analysis software is used to establish a finite element seepage field calculation model for Beijiang levee project.The effects of steady state,transient state and different water levels on seepage characteristics of multi-layer levee foundation are studied and analyzed.The results show that the seepage is mainly concentrated in the strong permeable layer 20m away from the ground.when the water level of the Waijiang River reaches 8.7 m or above,the seepage flow increases with the rise of the water level,and when the water level exceeds 10 m,the seepage flow increases obviously.In the case of transient seepage,the seepage flow increases with the increase of water level and time.When the water level reaches 15.78 m,the dam may be damaged by seepage.In addition,based on the analysis results,reasonable anti-seepage measures are put forward for the key parts of levee foundation,body and bank slope,which can provide reference for the seepage safety evaluation of Beijiang levee project and effectively guarantee the safety of the levee.