上软下硬型库水边坡流固耦合特征分析

Analysis of fluid-solid coupling characteristics of upper-soft lower-hard reservoir slope

在水库蓄水过程中,由于地下水位的改变会导致库水边坡内部的渗流场发生变化,从而导致原始边坡进入浅表生改造阶段,若处置不当,可能导致边坡变形逐渐增大,甚至形成滑坡,因此对库水边坡的流固耦合特征进行分析很有必要。本文以上软下硬型边坡为研究基础,使用SWEEP/W模块对库水边坡进行蓄水作用下的数值分析,计算结果发现:在水库蓄水时,边坡水头总是沿斜坡中上部指向坡脚(河谷),为进一步分析边坡的应力、应变特征,在渗流分析的基础上使用SIGMA/W模块,将渗流场与应力场耦合计算,得出了考虑渗流作用下的应力/应变场,进而得出在蓄水作用下的斜坡可能存在的软弱面,最后使用SLOPE/W模块进行稳定性计算,得出稳定性系数,完成稳定性评价,该研究方法对库水边坡的变形研究具有一定的借鉴意义。

During the storage process of the reservoir,the change of groundwater level will cause the seepage field inside the reservoir water slope to change,which will cause the original slope to enter the stage of shallow surface regeneration.If it is not handled properly,the slope deformation may gradually increase.It even forms a landslide,so it is necessary to analyze the fluid-solid coupling characteristics of the reservoir water slope.In this paper,the above soft-low-hard slope is the research foundation.The SWEEP/W module is used to carry out a numerical analysis of the reservoir water slope under the effect of water storage.The calculation results show that:when the reservoir is water storage,the slope water head is always along the upper part of the slope Pointing to the foot of the slope(river valley),in order to further analyze the stress and strain characteristics of the slope,the SIGMA/W module is used on the basis of the seepage analysis,and the seepage field and the stress field are coupled and calculated,and the stress/strain under consideration of seepage is obtained Field,and then obtain the possible weak surface of the slope under the effect of water storage,and finally use the SLOPE/W module to calculate the stability,obtain the stability coefficient,and complete the stability evaluation.This research method is used to determine the deformation of the reservoir slope The research has certain reference significance.