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文章在分析堆积体物质组成及结构特征等地质环境的基础上,对坝前堆积体的成因机制、潜在变形破坏模式进行了进一步深入研究。结果表明,该堆积体主要在地形、构造、风化卸荷等因素作用下,岩体碎裂沿坡堆积,受河水及雨水等冲刷,进一步溶蚀胶结,逐步演化成如今的结构及外部特征。采用极限平衡法进行了计算,堆积体整体较稳定,在暴雨和水位降落工况下,稳定性欠佳,对顶部进行削坡处理后,稳定性满足要求。
Based on the analysis of the geological environment such as the composition and structural features of the sediments, the paper further studies the genesis mechanism and the potential deformation and failure modes of the sedimentary bodies in front of the dam. The results show that the main body of the deposit is mainly composed of topography, structure, weathering and unloading, and the rock fragments are accumulated along the slope and washed away by river water and rainwater to further dissolution and cementation, gradually evolving into today’s structural and external features. The limit equilibrium method was used to calculate the stability of the pile body as a whole. Under the conditions of rainstorm and water level drop, the stability is not good. After the top is cut, the stability meets the requirements.