摘要
针对超深软弱覆盖层上的面板坝工程止水缝安全问题,从变形和应力2个方面开展优化研究,揭示了防渗墙连接板趾板面板防渗体系的变形模式,定位了薄弱位置,提出了优化方案,并量化了工程应用效果.结果表明,防渗墙与趾板间沉降差集中在防渗墙与连接板之间的止水缝处,设置多块连接板无法起到逐步过渡沉降差的作用.防渗墙下游侧设置侧向支撑、制作倾斜形止水缝、趾板下设支撑墙均可减小防渗墙连接板间止水缝沉陷变形.相比垂直止水缝和多块连接板的传统方案,所提的防渗墙顶部拓宽连接板倾斜形止水缝以及防渗墙顶部拓宽倾斜形止水缝趾板下设支撑墙的深厚覆盖层上面板坝防渗体系综合优化方案可使防渗墙与连接板之间止水缝沉陷变形分别减小41.5%和53.8%.
For the safety concerns of joints in concrete faced rockfill dams(CFRD)built on ultra-deep weak overburden layers,research was conducted to optimize both deformation and stress.The deformation modes of the anti-seepage system including the cutoff wall,connecting slab,toe slab,and face slab were revealed.The weak points were identified.The optimization strategies were proposed,and the effects of the application were quantitatively assessed.The results indicate that the differential settlement between the cutoff wall and the toe slab is primarily concentrated at the joint between the cutoff wall and the connecting plate.Implementing multiple connecting plates is ineffective in gradually mitigating this differential settlement.Lateral supports on the downstream side of the cutoff wall,inclined joints,and a support wall beneath the toe slab can contribute to reducing the joint deformation between the cutoff wall and the connecting plate.Compared with the traditional designs involving vertical joints and multiple connecting plates,the proposed comprehensive optimization schemes for the anti-seepage system in concrete-faced rockfill dams with thick overburden layers,which include widening the top of the cutoff wall with connecting plates and inclined joints,and widening the top of the cutoff wall with inclined joints and a support wall beneath the toe slab,can reduce the settlement deformation at the joint between the cutoff wall and the connecting plate by 41.5%and 53.8%,respectively.
作者
邹德高
屈永倩
孔宪京
常哲瑜
刘京茂
陈楷
Zou Degao;Qu Yongqian;Kong Xianjing;Chang Zheyu;Liu Jingmao;Chen Kai(State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116024,China;School of Infrastructure Engineering,Dalian University of Technology,Dalian 116024,China)
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2024年第5期1089-1096,共8页
Journal of Southeast University：Natural Science Edition
基金
国家自然科学基金资助项目(52109151,52192674,U23B20149)
西藏自治区重点研发计划资助项目(XZ202201ZY0017G).
关键词
深厚覆盖层
面板堆石坝
止水缝变形
优化设计
deep overburden layer
concrete faced rockfill dam
joint deformation
optimization design
