某碾压石渣料防洪堤边坡稳定有限元计算分析

Finite Element Analysis of the Slope Stability of Roller Compacted Rock Ballast Flood Control Embankment

碾压石渣料防洪堤由于施工简单,经济性良好,常用于河道治理工程中的堤防建设。为了合理评价防洪堤边坡的稳定性,采用水工结构有限元分析软件Autobank对某堤防边坡在不同运行工况下的抗滑稳定性进行定量计算和分析,并采用岩土有限元软件PLAXIS 2D进行复核。结果表明:①该防洪堤左岸的碾压石渣斜坡式堤防和右岸的衡重挡墙复合式堤防边坡的抗滑稳定安全系数均大于规范最小允许值,满足安全要求;②采用PLAXIS 2D计算得到的堤防边坡安全系数和最不利滑裂面与Autobank的计算结果基本一致,说明本工程碾压石渣料防洪堤边坡的稳定设计是合理可行的。相关研究成果对今后类似防洪堤的稳定计算具有一定的参考价值。

Because of its simple construction and good economy,roller compacted gravel material flood control embankment is often used in the construction of river regulation projects.In order to evaluate the stability of flood control embankment slope reasonably,the anti sliding stability of a embankment slope under different operation conditions is quantitatively calculated and analyzed by using the hydraulic structure finite element analysis software Autobank,and the geotechnical finite element software PLAXIS is used.The results show that①the anti sliding stability safety factors of the left bank roller compacted slag slope embankment and the right bank balanced weight retaining wall composite embankment slope are greater than the minimum allowable value of the code,which meet the safety requirements;②the safety factor and the most unfavorable slip surface of the embankment slope calculated by PLAXIS 2D are basically the same as those calculated by Autobank,which shows that the stability design of the embankment slope for flood control with roller compacted rock ballast is reasonable and feasible.The relevant research results have certain reference value for the stability calculation of similar flood control levees in the future.