摘要
:基于长江三峡大坝碾压混凝土方案左厂房 12号坝段上部为常态混凝土、下部为上下游面均设有常态混凝土的防渗结构型式的碾压混凝土坝的特点 ,借助于渗流场求解的结点虚流量法及排水子结构技术 ,并提出“排水孔开关器”的概念和渗流非均质成层材料单元模型 ,对坝中设计时存在的主要渗流疑虑问题、大坝的防渗与排水设施渗控方案的特性进行了数值分析研究 .结果表明 ,导致碾压混凝土坝渗流特性复杂化的坝体强渗透各向异性是难以避免的 ,但只要有合理的防渗结构和排水设施 。
Taking into account the special structural properties of the left power house block of conventional concrete above EL.90?m and RCC concrete below the elevation and with an upstream conventional concrete slab structure for impermeabilization,the authors develop an inhomogeneous multi laminate media element model for seepage analysis of RCC dams based on the research of the numerical procedure of nodal virtual flux and the technique of draining substructure for drainage holes.In order to completely emulate the real seepage control behavior of the drainage holes located in the area of the dam foundation,a new concept of “drainage hole seepage switch” is suggested and added to the drainage substructures.A few related seepage problems in the design of the dam and the seepage control characteristics of the seepage control scheme composed of the upstream seepage protection slab and drainage hole curtains are numerically analyzed in detail.The RCC dam body is a strong anisotropic concrete structure and therefore the seepage property of the dam is considerably complicated.But if the seepage protection and draining control scheme is reasonably designed and constructed the characteristics of the seepage fields of the dam can be well controlled.
出处
《河海大学学报（自然科学版）》
CAS
CSCD
2000年第2期1-6,共6页
Journal of Hohai University(Natural Sciences)
基金
教育部博士点基金资助项目!(97029406)
水利部水利技术开发基金资助项目!(SJ9705)
关键词
层面
缝面
碾压混凝土坝
抗渗
坝段
matrix concrete of RCC
lift interface
lift joint interface
thickness of the matrix concrete layer
course of one continuous construction of lifts
inhomogeneous multi laminate media element model
drainage hole seepage switch
draining substructu
