摘要
针对黄土地区引水渠道的渗漏问题,提出了两种防渗方案衬砌层加灰土垫层(2 m厚)和衬砌层加灰土垫层(2 m厚)加渠底原土翻夯(3 m厚),并且利用基于有限元法的非饱和土水模拟软件SEEP/W,对不同厚度黄土区段的引水渠道进行了数值模拟。通过对比实测数据与室内试验数据,对模型中风积黄土的渗透系数函数及土水特征曲线进行了校正。之后,耦合了应力场及位移场,对引水渠道进行全面多工况的分析发现,随着风积黄土层厚度的增大,等水位线密集区逐渐从衬砌层延伸到灰土垫层;随着时间的增加,风积黄土层厚度越小,等水位线越密集。
To solve the leakage problem of the diversion channels in the loess area,two designs were discussed.Plan 1： lining layer plus spodosol cushion layer（ 2 meters thick）; plan 2： lining layer plus spodosol cushion layer（ 2 meters thick） plus dynamic compaction soil of the channel bottom（ 3 meters thick）. And then a numerical simulation of different channels in loess area of different depth was developed by using the finite element software SEEP / W. By comparing the measured data and the laboratory test data,the soil-water characteristic curve and the permeability coefficient function of the eolian loess in the model were calibrated. Based on the calibrated model,the stress field and the displacement field were coupled. According to the overall analysis of the channel,the water isoline concentration area extends gradually from lining layer to the spodosol cushion layer along with the increase of thickness of eolian loess; with the increase of time duration,the smaller the thickness of the eolian losses,the denser the water isoline concentration.
出处
《水利与建筑工程学报》
2016年第1期192-196,共5页
Journal of Water Resources and Architectural Engineering
