坝基混凝土直剪试验数值模拟分析  

Numerical Simulation and Failure Mechanism of Direct Shear Test of Dam Foundation Concrete

作　　者：张建伟 王文轩 王勇 黄锦林[3] 曹克磊 ZHANG Jianwei;WANG Wenxuan;WANG Yong;HUANG Jinlin;CAO Kelei(School of Water Conservancy,North China University of Water Resources and Electric Power,Zhengzhou 450046,China;Pearl River Water Resources Research Institute,Pearl River Water Resources Commission,Guangzhou 510635,China;Guangdong Research Institute of Water Resources and Hydropower,Guangzhou 510635,China)

机构地区：[1]华北水利水电大学水利学院,郑州450046 [2]珠江水利委员会珠江水利科学研究院,广州510635 [3]广东省水利水电科学研究院,广州510635

出　　处：《广东水利水电》2023年第2期1-6,共6页Guangdong Water Resources and Hydropower

基　　金：广州市基础研究计划(编号:202002030467)。

摘　　要：该文以坡月水库为研究对象,利用ABAQUS有限元软件对坝基混凝土与基岩胶结面开展原位直剪试验的有限元数值模拟。在验证了数值模型正确性和模拟方法可行性的基础上,对胶结面处的不同工况下的应力-应变关系、应力分布及破坏机理进行分析。结果表明:胶结面处应力分布呈两端大中间小,剪应力最大值集中在胶结面的边角处;胶结面处的损伤首先产生于加载端,并沿剪切方向逐渐发展,直至贯通整个胶结面;胶结面的抗剪能力随法向应力的增大而增强,使得胶结面完全破坏时的最大剪切应力逐渐增加。通过数值模拟与分析,可以充分揭示坝基胶结面处的断裂损伤演变规律,为大坝的建设及安全运行提供科学的理论依据。In this paper, taking Poyue Reservoir as the research object, the finite element numerical simulation of in-situ direct shear test on the cemented surface between dam foundation concrete and bedrock is carried out by using ABAQUS finite element software. On the basis of verifying the correctness of the numerical model and the feasibility of the simulation method, the stress-strain relationship, stress distribution and failure mechanism at the cementation surface under different working conditions are analyzed. The results show that the stress distribution at the cementation surface is uneven, the two ends are large and the middle is small, and the maximum shear stress is concentrated at the corners of the cementation surface;The damage at the cementation surface first occurs at the loading end and develops gradually along the shear direction until it penetrates the whole cementation surface;The shear capacity of the cemented surface increases with the increase of normal stress, so that the maximum shear stress increases gradually when the cemented surface is completely destroyed. Through numerical simulation and analysis, the evolution law of fracture damage at the cemented surface of the dam foundation can be fully revealed, which provides a scientific theoretical basis for the construction and safe operation of the dam.

关 键 词：混凝土与基岩胶结面 直剪试验 抗剪强度参数 数值模拟 

分 类 号：TV321[水利工程—水工结构工程]