Factors Influencing Seepage Field of Geomembrane Faced Rockfill Dams on Deep Overburden

CEN Wei-jun; ZHAO Yu-hao; LI Deng-jun; LIU Li-zeng

doi:10.11988/ckyyb.20211233

PDF(1105 KB)

Journal of Changjiang River Scientific Research Institute ›› 2023, Vol. 40 ›› Issue (4) : 95-99,106. DOI: 10.11988/ckyyb.20211233

Factors Influencing Seepage Field of Geomembrane Faced Rockfill Dams on Deep Overburden

CEN Wei-jun, ZHAO Yu-hao, LI Deng-jun, LIU Li-zeng

Author information +

History +

Abstract

Seepage control of dam foundation is a key issue that needs to be solved in dam construction with deep overburden. Finite element method is employed to analyze the seepage characteristics of geomembrane impervious earth-rock dam on deep overburden. The study focuses on the impact of the depth of suspended cut-off wall, the depth of overburden, and permeability on the seepage field of dam foundation. Results reveal that the seepage characteristics of dam foundation are significantly affected by these factors. Under varying depth of cut-off wall or overburden layer, the relation curves of seepage versus relative seepage control depth conincide in general, displaying a trend of slow linear decline before dramatic reduction. The depth of cut-off wall and overburden layer jointly affect the seepage control effect. When suspended cut-off wall is adopted, the relative anti-seepage depth should be in a good logarithmic linear correlation with permeability coefficient of overburden to ensure that the dam seepage control rate reaches 75%. This fitting relation can be used for preliminary design of cutoff wall depth for similar projects or effect evaluation of cutoff for existing projects.

Key words

geomembrane faced rockfill dam / deep overburden / seepage characteristics / relative impermeable depth / control rate of seepage flow

Cite this article

EndNote

Ris (Procite)

Bibtex

Download Citations

CEN Wei-jun, ZHAO Yu-hao, LI Deng-jun, LIU Li-zeng. Factors Influencing Seepage Field of Geomembrane Faced Rockfill Dams on Deep Overburden[J]. Journal of Changjiang River Scientific Research Institute. 2023, 40(4): 95-99,106 https://doi.org/10.11988/ckyyb.20211233

References

[1] 孔俐丽, 刘小生, 赵剑明, 等. 高土石坝建设的若干应用基础研究问题. 中国水利水电科学研究院学报, 2006, 4(4): 310-313.
[2] 沈振中,邱莉婷,周华雷. 深厚覆盖层上土石坝防渗技术研究进展. 水利水电科技进展,2015,35(5):27-35.
[3] XU Li-qun, SHEN Zhen-zhong, TANG Yong. The Seepage Characteristics Analysis for Ieka Concrete Face Rockfill Dam//Flow in Porous Media-from Phenomena to Engineering and Beyond. Marrickville, Australia: Orient Acad Forum, 2009: 868-871.
[4] 徐毅, 侍克斌, 毛海涛. 悬挂式微透水防渗墙的土石坝渗流计算. 水资源与水工程学报, 2014, 25(4): 138-141.
[5] 王正成, 毛海涛, 申纪伟, 等. 深厚覆盖层中局部强透水层对渗流的影响研究. 水资源与水工程学报, 2019, 30(4): 159-166.
[6] 白勇. 深厚覆盖层地基防渗排水设施对渗流场影响的数值分析. 西安: 西安理工大学, 2009.
[7] 张文捷, 魏迎奇, 蔡红. 深厚覆盖层垂直防渗措施效果分析. 水利水电技术, 2009, 40(7): 90-93.
[8] 谢兴华, 王国庆. 深厚覆盖层坝基防渗墙深度研究. 岩土力学, 2009, 30(9): 2708-2712.
[9] 毛海涛, 张保平, 何运祥, 等. 无限深透水地基土石坝坝基防渗体效果研究. 人民黄河, 2011, 33(3): 109-112.
[10] 岑威钧, 沈长松, 童建文. 深厚覆盖层上复合土工膜防渗堆石坝筑坝特性研究. 岩土力学, 2009, 30(1): 175-180.
[11] 沈振中, 岑威钧, 徐力群. 工程渗流分析与控制. 北京: 科学出版社, 2020.
[12] 岑威钧, 王辉, 李邓军. 土工膜缺陷对土石坝渗流特性及坝坡稳定的影响. 武汉大学学报(工学版), 2018, 51(7): 589-595.
[13] 岑威钧, 和浩楠, 李邓军. 土工膜缺陷对土石坝渗流特性的影响及控制措施. 水利水电科技进展, 2017, 37(3): 61-65, 71.
[14] 岑威钧, 都旭煌, 耿利彦, 等. 随机多缺陷条件下土工膜防渗土石坝渗漏特性. 水利水电科技进展, 2018, 38(3): 60-65.
[15] CEN W, LI D, WANG H. Impact of Transient Seepage on Slope Stability of Earth-Rock Dams with Geomembrane Barrier Defects. Environmental Geotechnics, 2020, 7(8): 581-590.