石北啸,常伟坤. 堰塞坝料室内试验缩尺效应研究[J]. 水利水运工程学报,2023(2):80-86. doi: 10.12170/20210722004
引用本文: 石北啸,常伟坤. 堰塞坝料室内试验缩尺效应研究[J]. 水利水运工程学报,2023(2):80-86. doi: 10.12170/20210722004
(SHI Beixiao, CHANG Weikun. Research on the scale effect of barrier dam material in laboratory test[J]. Hydro-Science and Engineering, 2023(2): 80-86. (in Chinese)). doi: 10.12170/20210722004
Citation: (SHI Beixiao, CHANG Weikun. Research on the scale effect of barrier dam material in laboratory test[J]. Hydro-Science and Engineering, 2023(2): 80-86. (in Chinese)). doi: 10.12170/20210722004

堰塞坝料室内试验缩尺效应研究

Research on the scale effect of barrier dam material in laboratory test

  • 摘要: 因室内试验设备尺寸的限制,需将坝料的最大粒径缩尺至室内试验设备的容许尺寸,粒径缩尺导致室内试验参数与原始粒径下的实际参数有差异。对取自现场的某堰塞坝料按规范方法缩尺后,开展不同最大粒径下的干密度、渗透系数、三轴剪切室内试验。结果表明:缩尺导致粒径小于5 mm的细颗粒含量增加并影响试样密实程度;随着最大粒径的减小,试样渗透系数逐渐降低,直接采用缩尺后的试验结果会高估堰塞坝料的抗渗能力;缩尺对强度指标φ值影响不大,但缩尺后的试样最大粒径越小,邓肯-张模型参数的KKb值越大,模型参数nm值越低,缩尺后的试验结果高估了堰塞坝料强度和坝体抵抗变形的能力,低估了堰塞坝体的实际变形。研究结果可为坝体稳定性分析与变形分析提供参考。

     

    Abstract: Due to the size limitation of the laboratory test equipment, the maximum particle size of the dam material has to be scaled down to the allowable size of the laboratory test equipment, and the particle size scaling would lead to changes in the test parameters. The results of the dry density, permeability coefficient, and triaxial shear tests for a barrier dam material with different maximum particle sizes show that the reduction in size leads to an increase in the content of fine particles less than 5 mm and affects the degree of compactness; as the maximum particle size decreases, the permeability coefficient of the specimen gradually decreases, and the direct use of the reduced size test results will overestimate the impermeability of the barrier dam material. Contraction rule has little effect on the strength index \varphi value, but as the sample of maximum particle size decreases, the Duncan-Chang model parameters K and Kb increase; as n and m decrease, the test results of the scaled size overestimate the strength of the barrier dam material and the ability of the dam to resist deformation, and the actual deformation of the dam is underestimated. The results of the study can provide an important reference for dam stability analysis and deformation analysis.

     

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