Study on the influence of interlayer protection on the allowable hydraulic gradient of deep overburden soil

被引：0
|
作者：
Qiu Z. [1 ]
Zhang X. [1 ]
Luo Y. [1 ]
Jin W. [2 ]
Zhang D. [2 ]
Sheng J. [1 ]
Wang H. [1 ]
机构：
[1] College of Water Conservancy and Hydropower Engineering, Hohai University, Jiangsu, Nanjing
[2] Power China Chengdu Engineering Corporation Limited, Sichuan, Chengdu
来源：
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | 2024年 / 43卷 / 04期
基金：
中国国家自然科学基金;
关键词：
allowable hydraulic gradient; deep alluvium foundation; filter; hydraulic engineering; interlayer protection; seepage stability;
D O I：
10.13722/j.cnki.jrme.2023.0776
中图分类号：
学科分类号：
摘要：
Interlayer protection significantly influences the anti-seepage strength of deep overburden soil, and it should be considered in the evaluation of seepage stability, however this influence can't be quantified now. Aiming at a typical strata structure of “②–2, ③–1, ④” in Luding hydropower station, a list of single-layered and three-layered seepage tests were performed to investigate the influence of interlayer protection. The results indicate that there are two different interlayer protection mechanisms between base soil and overlying strata. When the retention ratio meets the needs of filter and drainage, the overlying strata is the same as the artificially designed filter, and a continuous hydraulic transition is formed to give full play to the anti-seepage ability of the base soil. When the retention ratio only meets the need of filter, the overlying strata mainly undertake the pressure to protect the base soil. Based on the experimental results, the influence of interlayer protection on the allowable gradient was quantified, and then a method determining the allowable gradient was established. Under the protection of strata of ③–1 and ④, the allowable gradient of stratum ②–2 can increase to two times as the initial allowable gradient;Under the protection of stratum of ④, the allowable gradient of stratum ③–1 can increase to 2.3 times as the initial value. The results provide important supports for the solution of abnormal leakage and safety evaluation of Luding hydropower station, and they will provide reference for other similar projects. © 2024 Academia Sinica. All rights reserved.
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页码：1026 / 1039
页数：13
相关论文
共 17 条
  • [1] MAO Changxi, DUAN Xiangbao, FENG Yubao, Study on piping and filters:part II of filters[J], Rock and Soil Mechanics, 26, 5, pp. 680-686, (2005)
  • [2] LUO Yulong, LI Ao, ZHANG Haibin, Et al., Visual experimental studies on suffusion in double-layered soil under different retention ratios[J], Chinese Journal of Rock Mechanics and Engineering, 43, 1, pp. 226-235, (2024)
  • [3] XIE Dingsong, CAI Hong, WEI Yingqi, Et al., Experimental study on the seepage stability characteristics of poor gravel overburden under stress, Water Resources and Hydropower Engineering, 52, Supp.2, pp. 446-450, (2021)
  • [4] JIANG Zhongming, WANG Wei, FENG Shurong, Et al., Experimental of study on the relevance between stress state and seepage failure of sandy-gravel soil[J], Chinese Journal of Hydraulic Engineering, 44, 12, pp. 1498-1505, (2013)
  • [5] LIANG Y, YEH T C J, CHEN Q K, Et al., Particle erosion in suffusion under isotropic and anisotropic stress states[J], Soils and Foundations, 59, 5, pp. 1371-1384, (2019)
  • [6] HE Ruping, Study on the seepage stability of interlayer shear zone of Xiluodu hydropower station[J], Design of Hydroelectric Power Station, 19, 2, pp. 90-92, (2003)
  • [7] LI Yonghong, JIANG Yuanyuan, Seepage stability evaluation of deep overburden foundation of Jiniu hydropower station[J], Design of Hydroelectric Power Station, 26, 3, pp. 44-47, (2010)
  • [8] LIAO Guiying, JIANG Yuanyuan, Seepage stability evaluation of deep overburden foundation of Chujugou hydropower station[J], Sichuan Water Conservancy, 39, 2, pp. 12-13, (2018)
  • [9] ZHOU Jian, BAI Yanfeng, YAO Zhixiong, Meso-scale model test on filter prevention of piping-typed soils[J], Chinese Journal of Hydraulic Engineering, 41, 4, pp. 390-397, (2010)
  • [10] LI Xiaoqing, QI Yang, TANG Xinjun, Et al., Simulation of base soil-filter system with two typical gradations based on PFC[J], Journal of Yangtze River Scientific Research Institute, 34, 4, pp. 92-97, (2017)
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