考虑混凝土面板裂缝的堆石坝三维渗流敏感性分析  

Sensitivity Analysis of 3D Seepage in Rockfill Dam Considering Concrete Panel Cracks

作　　者：李一帆 孙新建[1,2] 李国超 LI Yifan;SUN Xinjian;LI Guochao(School of Civil Engineering and Water Resources,Qinghai University,Xining 810016,China;Laboratory of Ecological Protection and High-Quality Development in the Upper Yellow River,Qinghai University,Xining 810016,China;Yellow River Engineering Consulting Co.,Ltd.,Zhengzhou 450003,China)

机构地区：[1]青海大学土木水利学院,青海西宁810016 [2]青海大学黄河上游生态保护与高质量发展实验室,青海西宁810016 [3]黄河勘测规划设计研究院有限公司,河南郑州450003

出　　处：《人民黄河》2024年第8期155-160,共6页Yellow River

基　　金：国家自然科学基金资助项目(51969026)。

摘　　要：为研究面板有裂缝时堆石坝渗透系数对其渗流特性的影响,以青海省某混凝土面板堆石坝为例,结合等效区块连续介质模型和Van Genuchten模型,提出考虑混凝土面板裂缝的饱和-非饱和渗流计算方法。通过设计正交试验开展堆石坝渗透系数敏感性分析,利用响应面法研究各部位渗透系数之间的交互作用对大坝总渗流量Q和下游坡脚渗透坡降J的影响。结果表明:坝体各分区渗透系数对Q、J的敏感程度不同,对大坝渗流特性影响显著的3个渗透系数为垫层渗透系数(K_(a))、主堆石区渗透系数(K_(c))、覆盖层Q_(3)^(a1)渗透系数(K_(e))。对于Q来说,各分区渗透系数的交互作用均不显著,而对于J来说,K_(a)与K_(c)、K_(a)与K_(e)的交互作用呈现出显著性。In order to investigate the influence of the permeability coefficient to the seepage characteristics of a rockfill dam with cracked pan-els,taking a concrete panel rockfill dam in Qinghai Province as an example,a calculation method for saturated-unsaturated seepage consider-ing concrete panel cracks was proposed,combining the equivalent block continuous medium model and the Van Genuchten model.Then,sensitivity analysis of the seepage coefficient of the rockfill dam was conducted by using orthogonal experimental design,and the interaction effects of the seepage coefficients of different parts on the total seepage flow rate(Q)and the downstream toe seepage gradient(J)of the dam were studied by using response surface methodology.The results indicate that the sensitivity of the permeability coefficients in different zones of the dam body to Q and J varies.The three permeability coefficients that significantly affect the seepage characteristics of the dam are the sub-base permeability coefficient(K_(a)),the main rockfill area permeability coefficient(K_(c)),and the cover layer permeability Q_(3)^(a1) coeffi-cient(K_(e)).For Q,the interaction effects of the permeability coefficients in each zone are not significant,whereas for J,significant interaction effects are observed between K_(a) and K_(c),as well as between K_(a) and K_(e).

关 键 词：面板裂缝 敏感性 正交试验设计法 响应面法 非饱和渗流 堆石坝 

分 类 号：TV223.4[水利工程—水工结构工程] TV641.4