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反映坝基帷幕体防渗时效的多场耦合数值模拟

彭 鹏, 单治钢, 宋汉周, 董育烦

彭 鹏, 单治钢, 宋汉周, 董育烦. 反映坝基帷幕体防渗时效的多场耦合数值模拟[J]. 岩土工程学报, 2011, 33(12): 1847-1853.
引用本文: 彭 鹏, 单治钢, 宋汉周, 董育烦. 反映坝基帷幕体防渗时效的多场耦合数值模拟[J]. 岩土工程学报, 2011, 33(12): 1847-1853.
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PENG Peng, SHAN Zhi-gang, SONG Han-zhou, DONG Yu-fan. Coupling model for assessing anti-seepage behaviors of curtain of dam foundation[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(12): 1847-1853.
Citation: PENG Peng, SHAN Zhi-gang, SONG Han-zhou, DONG Yu-fan. Coupling model for assessing anti-seepage behaviors of curtain of dam foundation[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(12): 1847-1853.
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反映坝基帷幕体防渗时效的多场耦合数值模拟  English Version

  • （ 1. 华东勘测设计研究院，浙江 杭州 310000 ； 2. 武汉大学水资源与水电工程科学国家重点实验室，湖北 武汉 430072 ； 3. 河海大学地球科学与工程系，江苏 南京 210098 ）

基金项目: 国家自然科学基金项目（ 50139030 ）；人事部留学回国人员科技活动择优项目（ 501072 ）；水利部公益性行业科研专项经费项目（ 200901064 ）
详细信息
    作者简介:

    彭 鹏 (1982 – ) ，男，河南周口人，博士后，主要从事水工建筑物地质体安全及地质灾害研究。

  • 中图分类号: TV223.4

Coupling model for assessing anti-seepage behaviors of curtain of dam foundation

  • (1. Hydro China Hua-dong Engineering Corporation, Hangzhou, 310000,China; 2. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China; 3. Department of Earth Science and Engineering, Hohai University, Nanjing 210098, China)

摘要

    摘要
  • 摘要: 坝基的渗流动态，很大程度上受控于坝基帷幕体的完好程度和止水效果，但是由于地下水长期存在的物理–化学作用，造成帷幕体防渗性能的衰减。为了能够再现坝基帷幕体防渗性能衰减的过程，依据渗流水力学以及水文地球化学的基本理论，建立了反映帷幕体防渗时效的多场耦合作用模型。该模型由渗流模块、溶质迁移模块、地球化学模块及帷幕体侵蚀模块构成，并采用 FEM 数值法求解。工程实例计算结果表明帷幕体的防渗效果随着时间的推移而弱化，此主要源自帷幕体中 Ca(OH)2 一类可溶性物质的溶失。在整个模拟时段，帷幕体中的钙质始终处于溶解状态，其不同部位发生溶蚀的强度也不相同，帷幕体底部的溶蚀量要高于其上部的溶蚀量；靠近坝基上游侧的帷幕的溶蚀量要高于下游侧的溶蚀量。钙离子迁移主要由于水动力条件和弥散作用共同引起的，且坝基各点的钙离子浓度随时间呈非线性变化。
    Abstract: The seepage flow in dam foundation is mainly controlled by the intact degree and the sealing effect of its curtain. Its property is weakened by long-term physical and chemical actions of groundwater. In order to describe the process of the damage to the curtain, a multi-field coupling model for water-rock-seepage curtain of the dam foundation is made up of seepage model, solute transport model, geochemistry model and curtain erosion model, and all the models are calculated by FEM. The results show that the curtain efficiency decrease with the time. Calcium has been always in dissolution during the time stress period for simulation. The erosion extent at the bottom of the curtain is much quicker than that at its top part. And it’s the same for the upstream and downstream. Calcium dissolution is mainly induced by hydraulic condition and dispersion, and it varies in a non-linear way.
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    • 参考文献(15)
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  • 发布日期:  2011-12-14

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