基于非饱和土理论的黄土地区引水渠道的渗流场研究

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英文篇名：Seepage Filed of a Diversion Channel in Loess Areas Based on the Unsaturated Soil Theory 作者：王鲁琦 英文作者：WANG Luqi;Institute of Geotechnical Engineering and Hydraulic Structure Engineering,North China University of Water Resources and Electric Power; 关键词：SEEP/W软件 ; 黄土湿陷性 ; 非饱和土 ; 多场耦合 ; 渗流场分析 英文关键词：SEEP / W;;loess collapsibility;;unsaturated soil;;multifield coupling;;seepage field analysis 中文刊名：FSJS 英文刊名：Journal of Water Resources and Architectural Engineering 机构：华北水利水电大学岩土工程与水工结构研究院; 出版日期：2016-02-15 出版单位：水利与建筑工程学报 年：2016 期：v.14;No.65 语种：中文; 页：FSJS201601036 页数：5 CN：01 ISSN：61-1404/TV 分类号：196-200

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.

引文

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