Overburden treatment for concrete face rockfill dams and its application in Hekoucun project

XING Jian-ying; GUAN Zhi-cheng; LÜ Xiao-long

doi:10.11779/CJGE202007021

Volume 42 Issue 7

Turn off MathJax

Article Contents

Abstract

References

Chinese Journal of Geotechnical Engineering > 2020 > 42(7): 1368-1376. > DOI: 10.11779/CJGE202007021

XING Jian-ying, GUAN Zhi-cheng, LÜ Xiao-long. Overburden treatment for concrete face rockfill dams and its application in Hekoucun project[J]. Chinese Journal of Geotechnical Engineering, 2020, 42(7): 1368-1376. DOI: 10.11779/CJGE202007021

Citation:

PDF (1262 KB)

Overburden treatment for concrete face rockfill dams and its application in Hekoucun project

1.
Yellow River Engineering Consulting Co., Ltd., Zhengzhou 450003, China
2.
The General Institute of Water Conservancy and Hydropower Planning and Design of the Ministry of Water Resources, Beijing 100120, China

More Information

Received Date: July 31, 2019
Available Online: December 05, 2022

Graphical Abstract

Abstract

Abstract

The concrete face, toe-slab, connecting slab, cut-off wall are usually used as the anti-seepage system of concrete face rockfill dams (CFRDs) on deep overburden. As the toe slab and dam body are built on the overburden, the deformation caused by filling and impoundment significantly affects the joint displacement of the anti-seepage system. Therefore, the quality of overburden treatment is the key to ensure the safety of the CFRDs. Aiming at the problem of overburden treatment, considering the Hekoucun project, several treatment schemes for dam foundation, such as dynamic compaction, consolidation grouting and high-pressure rotary spray, are proposed. Using the non-linear finite element method, the effects of various foundation treatment schemes on the joint deformation of anti-seepage system are systematically studied. The results show that consolidation grouting and high-pressure jet grouting pile can meet the design requirements. However, the consolidation grouting scheme is difficult to implement and difficult to achieve the design goal. Finally, the high-pressure jet grouting pile scheme is employed, and a new type of partition gradient layout is proposed. The on-site monitoring results show that the infiltration zone can effectively reduce the deformation of anti-seepage system. After reinforcement, the deformation of the overburden decreases significantly.
- overburden layer,
- sand pebble,
- foundation treatment,
- consolidation grouting,
- high-pressure jet pile

FullText(HTML)

References (19)

References

[1]	党林才, 方光达. 深厚覆盖层上建坝的主要技术问题[J]. 水力发电, 2011, 37(2): 24-29. https://www.cnki.com.cn/Article/CJFDTOTAL-SLFD201102007.htm DANG Lin-cai, FANG Guang-da. Major technical problems of constructing dam on deep overburden[J]. Water Power, 2011, 37(2): 24-29. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-SLFD201102007.htm
[2]	邓铭江. 严寒、高震、深覆盖层混凝土面板坝关键技术研究综述[J]. 岩土工程学报, 2012, 34(6): 985-996. https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC201206005.htm DENG Ming-jiang. Advances in key technology for concrete face dams with deep overburden layers under cold and seismic conditions[J]. Chinese Journal of Geotechnical Engineering, 2012, 34(6): 985-996. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC201206005.htm
[3]	沈振中, 田振宇, 徐力群, 等. 深覆盖层上土石坝心墙与防渗墙连接型式研究[J]. 岩土工程学报, 2017, 39(5): 939-945. https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC201705026.htm SHEN Zhen-zhong, TIAN Zhen-yu, XU Li-qun, et al. Reasonable connection type for cutoff wall and core wall of earth-rock dams on deep overburden layers[J]. Chinese Journal of Geotechnical Engineering, 2017, 39(5): 939-945. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC201705026.htm
[4]	全海. 河床覆盖层高压旋喷灌浆效果检测[J]. 岩石力学与工程学报, 2006, 25(2): 289-293. doi: 10.3321/j.issn:1000-6915.2006.02.011 QUAN Hai. Detection of effect of high-pressure rotary shotcreting grouting on river bed cover[J]. Chinese Journal of Rock Mechanics and Engineering, 2006, 25(2): 289-293. (in Chinese) doi: 10.3321/j.issn:1000-6915.2006.02.011
[5]	王启国. 水电工程坝基砾卵石层工程地质特性研究[J]. 岩石力学与工程学报, 2011, 30(2): 3671-3690. https://www.cnki.com.cn/Article/CJFDTOTAL-YSLX2011S2041.htm WANG Qi-guo. Study of engineering geological characteristics of gravel pebble layer for dam foundation of hydropower project[J]. Chinese Journal of Rock Mechanics and Engineering, 2011, 30(2): 3671-3690. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YSLX2011S2041.htm
[6]	PALMER D, NIKROUZ R, SPYROU A. Statics corrections for shallow seismic refraction data[J]. Exploration Geophysics, 2005, 36: 7-17.
[7]	汪小刚, 刘小生, 陈宁, 等. 深厚覆盖层力学特性测试技术研究[M]. 北京: 中国水利水电出版社, 2011. WANG Xiao-gang, LIU Xiao-sheng, CHEN Ning, et al. Researches on Testing Techniques for Mechanical Properties of Deep Overburden[M]. Beijing: China Water & Power Press, 2011. (in Chinese)
[8]	程展林, 潘家军, 左永振, 等. 坝基覆盖层工程特性试验新方法研究与应用[J]. 岩土工程学报, 2016, 38(增刊2): 18-23. https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC2016S2003.htm CHENG Zhan-lin, PAN Jia-jun, ZUO Yong-zhen, et al. New experimental methods for engineering properties of overburden of dam foundation and their applications[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(S2): 18-23. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC2016S2003.htm
[9]	温立峰, 柴军瑞, 王晓. 深覆盖层上面板堆石坝应力变形特性研究[J]. 岩土力学, 2015, 36(8): 2386-2394. https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX201508037.htm WEN Li-feng, CHAI Jun-rui, WANG Xiao. Stress-deformation behavior of a concrete-faced rockfill dam with a deep overburden foundation[J]. Rock and Soil Mechanics, 2015, 36(8): 2386-2394. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX201508037.htm
[10]	孙大伟, 邓海峰, 田斌, 等. 大河水电站深覆盖层上面板堆石坝变形和应力性状分析[J]. 岩土工程学报, 2008, 30(3): 434-439. https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC200803026.htm SUN Da-wei, DENG Hai-feng, TIAN Bin, et al. Deformation and stress analysis of Dahe CFRD built on thick alluvium deposits[J]. Chinese Journal of Geotechnical Engineering, 2008, 30(3): 434-439. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC200803026.htm
[11]	吴梦喜, 余挺, 张琦. 深厚覆盖层潜蚀对大坝应力变形影响的有限元模拟[J]. 岩土力学, 2017, 38(7): 2087-2095. https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX201707032.htm WU Meng-xi, YU Ting, ZHANG Qi. Finite element simulation of influence of deep overburden suffusion on dam stress and deformation[J]. Rock and Soil Mechanics, 2017, 38(7): 2087-2095. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX201707032.htm
[12]	郦能惠, 米占宽, 孙大伟. 深覆盖层上面板堆石坝防渗墙应力变形性状影响因素的研究[J]. 岩土工程学报, 2007, 29(1): 26-31. https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC200701003.htm LI Neng-hui, MI Zhan-kuan, SUN Da-wei. Numerical analysis of stress deformation behavior of concrete diaphragm wall in supper-deep overburdened layer of Yele hydropower station[J]. Chinese Journal of Geotechnical Engineering, 2007, 29(1): 26-31. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC200701003.htm
[13]	潘迎, 何蕴龙, 周小溪, 等. 河谷地形对深覆盖层中防渗墙应力变形影响分析[J]. 岩土力学, 2013, 34(7): 2023-2030. https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX201307030.htm PAN Ying, HE Yun-long, ZHOU Xiao-xi, et al. Analysis of effect of canyon terrain on stress and displacement of cutoff wall in dam foundation with deep overburden[J]. Rock and Soil Mechanics, 2013, 34(7): 2023-2030. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX201307030.htm
[14]	余翔, 孔宪京, 邹德高. 混凝土防渗墙变形与应力分布特性[J]. 浙江大学学报(工学版), 2017, 51(9): 1704-1711. https://www.cnki.com.cn/Article/CJFDTOTAL-ZDZC201709004.htm YU Xiang, KONG Xian-jing, ZOU De-gao. Deformation and stress distribution characteristics of concrete cut-off wall[J]. Journal of Zhejiang University(Engineering Science), 2017, 51(9): 1704-1711. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-ZDZC201709004.htm
[15]	碾压式土石坝设计规范：SL274—2001[S]. 2001. Design Code for Rolled Earth-Rock fill Dams: SL274—2001[S]. 2001. (in Chinese)
[16]	傅少君, 王曼. 振冲碎石桩地基有限元分析的复合模型研究[J]. 岩土力学, 2008, 29(2): 375-380. https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX200802027.htm FU Shao-jun, WANG Man. Study on composite model for vibro- replacement stone column foundation by FEM[J]. Rock and Soil Mechanics, 2008, 29(2): 375-380. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX200802027.htm
[17]	张希孟, 吕清岚. 长河坝水电站坝基覆盖层固结灌浆施工工艺试验[J]. 四川水力发电, 2015, 34(3): 52-57, 76. https://www.cnki.com.cn/Article/CJFDTOTAL-SCSL201503019.htm ZHANG Xi-meng, LU Qing-lan. Overburden consolidation grouting construction technology test at Changheba hydropower sation[J]. Sichuan Water Power, 2015, 34(3): 52-57, 76. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-SCSL201503019.htm
[18]	安关峰, 张洪彬, 刘添俊. 旋喷群桩复合地基承载特性的数值分析[J]. 岩土力学, 2012, 33(3): 906-912. https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX201203041.htm AN Guan-feng, ZHANG Hong-bin, LIU Tian-jun. Numerical analysis of bearing characteristics of composite subgrade reinforced by chemical churning pile groups[J]. Rock and Soil Mechanics, 2012, 33(3): 906-912. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX201203041.htm
[19]	陈生水, 李国英, 傅中志. 高土石坝地震安全控制标准与极限抗震能力研究[J]. 岩土工程学报, 2013, 35(1): 59-65. https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC201301002.htm HEN Sheng-shui, LI Guo-ying, FU Zhong-zhi. Safety criteria and limit resistance capacity of high earth-rock dams subjected to earthquakes[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(1): 59-65. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC201301002.htm