摘要
堤防加固以后,在堤防内布置了混凝土防渗墙。为了研究混凝土防渗墙的施工是否会导致垸内地下水状况的变化以及影响垸内生产、生活,需要对堤防加固后垸内渗流场进行计算分析。利用三维渗流有限元方法,计算分析了堤防内设置防渗体对于垸内区域渗流场的影响。首先在分析区域地层、水文及水文地质基础上,建立了有限元计算模型,确定了计算方案。然后,针对洪水期、常态期及枯水期,分别计算了无防渗设施、有防渗设施情况下的区域渗流场;在此基础上,对比分析了渗流场的差异、渗流量的变化情况等。最后得出结论:除了堤防局部位置外,防渗设施对于垸内地下水分布范围基本没有影响;在洪水期,防渗体具有明显抗灾作用;而在常态期外湖水位下降,垸内需水时,防渗体对于垸内渗流量影响相应下降,且在下降到一定水位后,几乎没有影响;在枯水期,防渗体则具有抑制垸内水流外渗的益处。
After the embankment is reinforced ,the seepage control walls are built in it .The seepage field is necessary to be calculated in order to study whether the seepage control wall will lead to the change of the groundwater and the influ -ence on people’s life .The impact of setting the impervious body in the embankment on the seepage field of the flood stor -age polders is calculated and analyzed by using 3-D seepage FEM .Firstly ,based on the analysis of regional geological structure and hydrogeology conditions ,a finite element model is created ,and the calculation scheme is determined . Then ,the regional seepage fields under seepage control measures and without prevention facilities are calculated separate -ly in connection with the flood period ,normal period and dry season .On this basis ,the seepage field and seepage flow changes are compared and analyzed .Finally ,The conclusions are obtained as follows ：In addition to the local positions of the embankment ,the seepage control facilities have little impact on the groundwater distribution in the embankment ;In the flood period ,the impervious body has obvious effect on disaster preventing ;In the normal period ,the water level out-side the lake drops ,when water is needed inside the embankment ,the influence of impervious body on the seepage flow inside the embankment is decreased .When falling to a certain level ,the effect is disappeared .In the dry season ,the impervious body has the benefits to inhibit the leakage inside the embankment .
出处
《水利与建筑工程学报》
2014年第2期88-94,共7页
Journal of Water Resources and Architectural Engineering
关键词
围垸
堤防
渗流
防渗
地下水
有限元法
flood-storage polder
embankment
seepage
seepage control
groundwater
FEM
