引用本文:梁岩,毛瑞敏,王毅,罗小勇.龙开口水电站坝基防渗墙数值模拟[J].水利水运工程学报,2018,(3):57-64
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龙开口水电站坝基防渗墙数值模拟
梁岩1, 毛瑞敏1, 王毅2, 罗小勇3
1.郑州大学土木工程学院，河南郑州;2.华能澜沧江水电开发有限公司，云南昆明;3.中南大学土木工程学院，湖南长沙
摘要:
以龙开口水电站坝基深槽开挖工程为依托，采用有限元法用四节点的薄板单元模拟钢筋混凝土防渗墙墙体，为防渗墙上游侧卵石河床地基土体的支承刚度系数及防渗墙支护结构建立有限元分析模型。通过分析提出了防渗墙支承刚度系数的确定方法，并分析了不同支撑条件下防渗墙的可靠性。结果表明：防渗墙与砂卵石地基土体之间的接触形式接近于滑动支撑连接，压缩模量取值越大，土体支撑刚度系数也越大；不同支撑条件下，防渗墙位移变化比内力变化更明显，支撑条件对墙体变形影响较大。
关键词:  防渗墙  有限元  压缩模量  支撑刚度系数
DOI：
分类号:TV 223.4
基金项目:国家自然科学基金资助项目（51178470）； 河南省高等学校重点科研项目（16A560025）
Numerical simulation of underground wall for retaining water at dam foundation of Longkaikou hydropower station
LIANG Yan1, MAO Ruimin1, WANG Yi2, LUO Xiaoyong3
1.College of Civil Engineering, Zhengzhou University, Zhengzhou;2.Huanenglancang River Hydropower Development Co., Ltd., Kunming;3.College of Civil Engineering, Central South University, Changsha
Abstract:
Based on the deep trench excavation works of the dam foundation of the Longkaikou hydropower station, the reinforced concrete underground wall for retaining water with four-node thin-slab element is simulated by a finite element analysis method in this study. A finite element analysis model for supporting stiffness coefficients of the foundation soil mass on the upper side of the underground wall for retaining water and its supporting structures is developed in the study. Based on the analysis, a determination method of the supporting stiffness coefficients of the underground wall for retaining water is put forward, and the analysis of the reliability of the impervious wall under different support conditions is carried out. The analysis and simulation results show that the changes of the impervious wall displacement are larger than the internal force, and that the support conditions have great influences on deformation of the impervious wall under the different support conditions. The research results given by this paper can provide a reliable theoretical basis for the construction and monitoring of the deep groove impervious wall located at the dam foundation of the long open hydropower station, and a reference for the similar hydropower works.
Key words:  underground wall for retaining water  finite element  compression modulus  support stiffness coefficients
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