高碾压砼重力坝层面失稳破坏的模拟分析

Numerical simulation of instability failure of high rolled compacted concrete gravity dam

以龙滩高碾压混凝土重力坝为工程背景,对高碾压混凝土重力坝的水平软弱层面,从局部裂缝扩展到整体破坏的全过程进行了模拟分析.在充分考虑到碾压混凝土的多相非均匀性细观结构特征的基础上,运用材料破坏全过程的分析软件系统MFPA2D对高碾压混凝土重力坝进行了分析,模拟给出了高碾压混凝土重力坝破坏过程的应力以及破坏单元分布图,并对碾压混凝土重力坝的破坏过程进行了分析.结果表明,裂缝扩展的第二阶段为破坏过程的关键阶段.

The numerical simulation procedure for horizontal incompetent layer surface of rolled compacted concrete gravity dam from partial crack to whole failure was proposed. The numerical simulation was performed for the roiled compacted concrete gravity dam in Longtan. The numerical procedure Through considering the multi-phase and heterogeneity characteristic of rolled compacted concrete and using MFPA software for the analysis of material failure process, the stress of failure process and the distribution of failure element for the high rolled compacted concrete gravity dam were obtained. The whole failure process of the rolled compacted concrete gravity dam was also analyzed. It is suggested that the second stage of crack propagation is the key stage of the whole failure process.