泄洪雨雾入渗分析中的几个问题讨论  

Infiltration Effect Research on Atomized Rain into Slope

作　　者：李新强[1] 谢兴华[2] 

机构地区：[1]中国水利水电科学研究院岩土工程研究所,北京100044 [2]南京水利科学研究院水工水力学研究所,南京210029

出　　处：《长江科学院院报》2009年第B10期23-28,共6页Journal of Changjiang River Scientific Research Institute

基　　金：国家自然科学基金重点项目(50539100);中国水利水电科学研究院开放基金资助

摘　　要：泄洪雨雾入渗导致的边坡稳定问题随着高坝大库的建设越来越突出,但对于泄洪雨雾入渗渗流过程的研究,人们的认识和理解仍不充分。根据泄洪雾化成雨的特点,结合现有的入渗模型,对雾化雨入渗模拟的模型选择、参数确定、边界条件和初始条件、计算收敛问题,以及模拟的细节进行了讨论。指出:在选用饱和-非饱和渗流模型分析时,参数确定在多孔介质中取得进展的同时引入到岩体、混凝土等结构中尚需论证;入渗边界是根据极限入渗率和降雨强度关系确定的一种边界条件;渗流场的初始状态应引起重视;这一渗流问题是一高度非线性问题,应考虑大型稀疏矩阵的处理、时步选择和迭代方法选择,结合现有的并行计算技术,提高计算精度和计算效率。With the construction of high dams with large reservoir in China, the stability problem of slopes under atomized rain area is outstanding. Atomized rain usually lasts rather a long time with heavy precipitation, which is very difficult to maintain the stability of a slope. The strength reduction of geomaterial and the load increase of atomized rain inside the slope are the cause which makes the slope failure. However, the coupling action is less considered. On the basis of the theoretical analysis, two suggestions are proposed： The infiltration boundary condition must be redefined in seepage analysis ; The conception that the matrix suction is not equal to negative pressure of unsaturated zone is formed during the process of stress and strain analysis, and the matrix suction involves in spacing ratio, saturation, etc. In combination with an example, the coupling analysis of seepage and stress is performed with a hydraulic slope under atomized rain.

关 键 词：边坡 泄洪雨雾 非饱和 渗流 

分 类 号：TV223.4[水利工程—水工结构工程]