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曾乾坤,林日东,倪小东.基于数值模拟及反分析研究施工因素对渗流特性的影响[J].河北工程大学自然版,2020,37(2):65-75
基于数值模拟及反分析研究施工因素对渗流特性的影响
Study on the Influence of Construction Factors on Seepage Characteristics Based on Numerical Simulation and Back Analysis
投稿时间:2019-12-30  
DOI:10.3969/j.issn.1673-9469.2020.02.011
中文关键词:  防渗墙  施工因素  数值模拟  浸润线  非稳定渗流  反分析
英文关键词:impervious wall  construction factors  numerical simulation  phreatic line  unsteady seepage  back analysis
基金项目:国家重点研发计划(2017YFC1502602);国家自然科学基金资助项目(面上)(51779083)
作者单位
曾乾坤 河海大学 岩土力学与堤坝工程教育部重点实验室, 江苏 南京 210098
福建省水利水电科学研究院, 福建 福州 350000 
林日东 福建省水利水电科学研究院, 福建 福州 350000 
倪小东 河海大学 岩土力学与堤坝工程教育部重点实验室, 江苏 南京 210098
福建省水利水电科学研究院, 福建 福州 350000 
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全文下载次数: 14
中文摘要:
      通过现场调研大量病险水库大坝防渗加固案例,结合文献介绍,归纳总结了勘察设计及施工阶段可能影响防渗墙防渗效果的诸多因素,并对其可能导致的不良效果进行合理归并分类。基于上述分类,建立简化物理模型,采用Geostudio中seep/w模块开展渗流模拟,评估土石坝防渗墙加固后的防渗效果。最终以某水库防渗加固的效果为例,针对存在质量缺陷、防渗结构形式差异、水位变动引起非稳定渗流等工况进行分析,通过出逸点水力坡降、渗流量等要素评估各工况因素对防渗效果的影响程度,结合浸润线形态开展防渗体防渗效果不良原因初判,并对稳态下不同库水位水平及库水位变动工况进行数值模拟,比较分析其浸润线形态差异,结果显示贯穿缺陷严重削弱了防渗墙防渗效果,不同库水位骤升骤降速率下的浸润线变化与稳态库水位相比在上游出现了"延缓上升"与"延缓下降"现象,通过以上研究为病险水库防渗加固整治提供参考。
英文摘要:
      Based on the field investigation of a large number of cases of seepage control and reinforcement of dangerous reservoir dams, combined with the introduction of literature, this paper sums up many factors that may affect the seepage control effect of the seepage control wall in the stage of survey, design and construction, and reasonably classifies the possible adverse effects. Based on the above classification, a simplified physical model was established, and seep/W module in GeoStudio was used to carry out seepage simulation, so as to evaluate the seepage control effect after the anti-seepage wall of earth rock dam was strengthened. Finally, taking the effect of seepage control and reinforcement of a reservoir as an example, the paper analyzed the existing quality defects, the difference of seepage control structure form, unstable seepage caused by water level change and other working conditions, evaluated the influence degree of each working condition factor on seepage control effect through the hydraulic gradient at the escape point, seepage flow and other factors, and carried out the preliminary judgment of the adverse causes of seepage control effect of seepage control body combining with the shape of seepage line, and does not The numerical simulation was carried out under the same reservoir water level and reservoir water level fluctuation conditions, and the difference of the phreatic line shape was compared and analyzed. The results show that the penetration defects seriously weaken the seepage control effect of the anti-seepage wall. Compared with the steady-state reservoir water level, the change of phreatic line under the different rate of sudden rise and fall of reservoir water level shows the phenomenon of "delayed rise"and "delayed fall" in the upstream. Through the above research, the seepage control of the dangerous reservoir is realized It can provide reference for reinforcement and renovation.
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