基于FLAC^(3D)平台的边坡非饱和降雨入渗分析  

Unsaturated seepage analysis of slope under rainfall condition based on FLAC^(3D)

作　　者：蒋中明[1,2] 熊小虎[1,2] 曾铃[3] 

机构地区：[1]长沙理工大学水利工程学院,长沙410004 [2]长沙理工大学水沙科学与水灾害防治湖南省重点实验室,长沙410004 [3]长沙理工大学土木与建筑学院,长沙410004

出　　处：《岩土力学》2014年第3期855-861,共7页Rock and Soil Mechanics

基　　金："十二五"科技支撑计划课题(No.2012BAK03B04);湖南省自然科学基金(No.12JJ3055)

摘　　要：为研究降雨入渗条件下三维边坡渗流场的变化过程,在全面研究FLAC3D软件渗流分析模块功能及算法的基础上,通过编写FISH函数完善了FLAC3D软件的非饱和渗流计算功能。基于降雨入渗机制的分析,编写了降雨入渗及停雨出渗边界的FISH函数,实现边坡三维降雨入渗过程的模拟。通过降雨条件下算例边坡的饱和非饱和渗流场变化过程的数值计算,研究了降雨入渗引起的边坡暂态饱和区变化过程,并与已有研究成果进行对比分析,从而验证了自编FISH函数实现边坡三维非饱和渗流计算结果的正确性。研究成果表明,文中提出的边坡三维非饱和降雨入渗分析是可行的,同时也为三维边坡非饱和渗流场的研究提供了一条有益的途径。To explore the variation process of seepage field of a three dimensions slope due to rainfall infiltration, routines for improvement of the capability of unsaturated seepage calculation of FLAC3D software were programmed by using FISH language after the analysis of unsaturated seepage module and seepage calculation algorithm used in FLAC3D platform. Based on the analysis of infiltration mechanism of rainfall, some FISH routines for simulation of rainfall infiltration and oozing of pore water in the slope after raining stop were programmed. The variation process of saturated and unsaturated seepage field of an engineering slope under the rainfall condition was simulated by employing FLAC3D software and the developed routines. The variation law of transient saturated area in the slope due to rainfall infiltration was explored and compared to the results in references cited in the paper. The distribution of transient saturated area in the slope obtained by calculation is same as the results presented in the cited references. It shows that the simulation of rainfall infiltration and unsaturated seepage analysis could be fulfilled corrected by employing FLAC3D platform with the relevant routines developed by users. The proposed method for the calculation of unsaturated seepage process provides a significance way for the simulation of seepage field of three-dimensional slope.

关 键 词：边坡 非饱和渗流 降雨入渗 

分 类 号：TU462[建筑科学—结构工程]