碾压混凝土坝防渗与排水渗控设计方法  

On Method For Design Of Seepage Control With Impermeability & Drainage Measures In RCCDs

作　　者：朱岳明[1] 刘昌军[1] 李璟[1] 王红斌[2] 袁翠平[1] 

机构地区：[1]河海大学,江苏南京210098 [2]中国水电顾问集团中南勘测设计研究院,湖南长沙410014

出　　处：《贵州水力发电》2005年第3期5-10,86,共7页Guizhou Water Power

摘　　要：本文采用渗流场求解的结点虚流量法、缝面无厚度平面单元、排水子结构和排水孔开关器等方法,依托10多年来对龙滩高碾压混凝土重力坝渗流特性和渗控优选方案的研究,对碾压混凝土大坝的坝上下游面防渗体和坝内排水孔幕的防渗与排水设施的渗控机理及效果进行了系统深入的分析研究。其中包括对上下游面防渗体的作用、本体的弱渗透性、层面和缝面的强透水性、上游面防渗体竖直劈头缝和水平裂缝的影响、坝段横缝止水失效的影响以及排水孔孔径和孔距的影响等问题的研究。With the applications of the numerical procedure of nodal virtual flux, 2D element without thickness for fracture seepage, drainage-substructure technique, and switch of drainage well to strict solution to seepage problems, and on the basis of the results from the continuous research on the seepage property and seepage control method of the Longtan RCC gravity dam about 200m high for over 10years, the seepage0control mechanism and effectiveness of the seepage control system with seepage prevention structures on both of the upstream and downstream sides of RCCDs were studied in detail. The agents and problems involved are the effectiveness of the upstream and downstream impermeable structures, the weakness of the permeability of RCC matrix, the strong permeability of the interfaces and lift joints, the appearance of vertical and horizontal cracks in the upstream seepage prevention structures, the efficacy lose of impermeable measures in the transverse contraction joints between dam blocks, the diameter and spacing at centers of drainage wells, and so on.

关 键 词：水工结构 碾压混凝土坝 渗流场 结点虚流量法 缝面无厚度平面单元 渗控设计方法 

分 类 号：TV223.4[水利工程—水工结构工程]