深厚覆盖层上闸坝坝基振冲桩处理方案优选  

Selection of Treatment for Dam Foundation Vibration Pile on Deep Overburden Layer

作　　者：李露 张立勇[1] 曹乐君 李海[1] LI Lu;ZHANG Li-yong;CAO Le-jun;LI Hai(College of Water Resource ＆ Hydropower,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学水利水电学院,四川成都610065

出　　处：《水电能源科学》2018年第8期78-80,147,共4页Water Resources and Power

摘　　要：针对深厚覆盖层层次结构复杂、细砂与淤泥质层承载力不足的问题,以甲米一级水电站闸坝工程为例,采用D-P非线性本构模型,进行三维有限元数值模拟计算,分析了控制工况下的闸基变形特征及振冲效果。结果表明,控制工况天然地基条件下闸基承载力不满足要求,振冲地基后闸室变形和闸基承载力均满足现行规范要求。对振冲桩桩深和桩距的敏感性分析得出闸室各方向位移随振冲深度增加和振冲桩桩距减小而减小,其中铅直向位移最敏感。因此,要综合考虑振冲效果、施工难度和工程投资,选择最优地基处理方案。In view of the complex structure of deep overburden layer,the bearing capacity of fine sand and silt layer is not enough.Taking sluice dam project of the First Stage of Jiami Hydropower for an example,nonlinear D-P constitutive model was used to calculate 3 Dfinite element method numerical simulation and analyze the deformation characteristics and reinforcement effect of sluice foundation under control condition.The results show that under control condition,the bearing capacity of slice foundation does not meet the requirements.After vibration the deformation of sluice chamber and the bearing capacity of sluice foundation meet standard requirements.The sensitivity analysis of vibration height and pile distance shows that the displacement of the sluice chamber decreases with the increase of vibration depth and the decline of pile distance,and the vertical displacement is both the most sensitive.Therefore,optimal foundation treatment scheme can be chosen by considering the vibration effect,construction difficulty and engineering investment.

关 键 词：闸坝 有限元法 深厚覆盖层 振冲地基 应力变形 

分 类 号：TV223.242[水利工程—水工结构工程]