面板开裂对大坝渗流特性影响的有限元分析

Finite Element Analysis of Influence of Slab Cracking on Seepage Characteristics of Concrete Faced Rockfill Dam

面板堆石坝工程中混凝土面板常会出现不同程度的裂缝,可能对坝体防渗造成安全隐患。通过合理模拟不同深度、类型、位置、大小及分布的面板裂缝进行大坝渗流场的有限元分析,获得面板裂缝对大坝渗流量及浸润线等渗流要素的影响规律。结果表明,面板裂缝未贯穿时,对坝体渗流特性影响很小;单一贯穿性裂缝会显著影响局部水头线分布,且与裂缝位置和大小明显呈正相关;多裂缝条件下,大坝渗流量明显增大,浸润线明显抬高。研究成果可为实际面板堆石坝工程防渗设计与运行管理提供参考。

The cracks of concrete slab often appear in different degrees in the engineering of faced rockfill dam, which may cause hidden danger to the dam body seepage prevention. Through reasonable simulation of different depth, type, location, size and distribution of the slab cracks, the finite element analysis of the seepage field of the dam was carried out to determine the impact law of the slab cracks on the seepage flow rate and seepage line of the dam. The results show that the seepage characteristics of the dam are little affected by the cracks in the face plate without penetration. Single penetrating fracture can significantly affect the distribution of local water head, and is positively correlated with the location and size of the fracture. Under the condition of multiple cracks, the seepage discharge of the dam increases obviously, and the seepage line also increases obviously. The research results can provide reference for the anti-seepage design and operation management of concrete faced rockfill dam.