某水库副坝坝基渗漏成因分析及渗透稳定性计算

发布时间：2018-03-18 04:03

本文选题：副坝　切入点：坝基渗漏　出处：《水电能源科学》2017年07期 　论文类型：期刊论文

【摘要】：针对某水库副坝坝基长期存在的渗漏问题,在综合分析历次地质勘察结果的基础上,采用高密度电法对副坝进行无损探测,同时,采用有限元法对副坝渗流性态进行二维数值模拟,分析坝基渗漏对副坝渗透稳定性的影响。结果表明,副坝坝基渗漏主要是由于坝基存在强透水的砂砾石层;副坝坝基渗漏未彻底解决的主要原因是已采取的防渗措施不当或存在质量缺陷,1978~1979年实施的桩号0+678~0+700段沟槽防渗墙存在缺陷,2000年实施的灌浆效果不佳;防渗墙失效后,副坝坝基砂砾石层在校核洪水位工况下可能发生渗透破坏,建议进一步采用混凝土防渗墙对副坝坝基进行防渗加固处理。
[Abstract]:In view of the seepage problem existing in the foundation of a reservoir's auxiliary dam for a long time, on the basis of synthetically analyzing the results of the previous geological survey, the high density electric method is used to carry out the nondestructive detection of the auxiliary dam, and at the same time, The seepage behavior of auxiliary dam is simulated by finite element method, and the influence of seepage on seepage stability of auxiliary dam is analyzed. The results show that the seepage of auxiliary dam foundation is mainly due to the existence of strong permeable sand and gravel layer in dam foundation. The main reason that the leakage of auxiliary dam foundation is not completely solved is that the seepage prevention measures taken or the quality defects existed. The pile No. 0 6780 700 section of pile number 0 678 0 700 implemented from 1978 to 1979 has defects, and the grouting effect implemented in 2000 is not good, and after the failure of the impervious wall, the effect of grouting is not good. Seepage damage may occur in the sand gravel layer of auxiliary dam foundation under the condition of nuclear flood level. It is suggested that the concrete impervious wall should be further used for seepage prevention and reinforcement treatment of auxiliary dam foundation.
【作者单位】：南城子水库管理局;河海大学水利水电学院;铁岭市农田基本建设工作办公室;南京水利科学研究院;
【基金】：水利部公益性行业科研专项(20150133) 国家重点研发计划(2016YFC0401605,2016YFC0401603) 中央级公益性科研院所基本科研业务费专项资金重点项目(Y715005,Y716011) 国家自然科学基金面上项目(51679151)
【分类号】：TV223.4;TV697.32

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