| 鄱阳湖地区级配不良偏细砂砾石料力学特性 |
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| 引用本文： | 吴平,凌华,石北啸,傅华,韩华强. 鄱阳湖地区级配不良偏细砂砾石料力学特性[J]. 河海大学学报(自然科学版), 2024, 52(2): 69-76 |
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| 作者姓名： | 吴平 凌华 石北啸 傅华 韩华强 |
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| 作者单位： | 中铁水利水电规划设计集团有限公司,江西 南昌330029;南京水利科学研究院岩土工程研究所,江苏 南京 210029;水利部水库大坝安全重点实验室,江苏 南京 210029 |
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| 基金项目： | 江西省水利厅科技项目(202124ZDKT06);国家重点研发计划项目(2022YFC3005502);国家自然科学基金面上项目(52279135) |
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| 摘 要： | 基于大型三轴试验数据,研究了级配和相对密度D r 对鄱阳湖地区级配不良偏细砂砾石料强度和变形特性的影响。结果表明:随着小于5. mm 粒径颗粒质量分数的增加,砂砾石料压实性能降低;随着大于5. mm 粒径颗粒质量分数P5和D r 的增大,强度指标、初始切线弹性模量与体积模量增大;本文研究范围内,随P5和D r 的增大,强度指标c、φ、φ0、 Δ φ线性增大,且P5和D r 对强度指标的作用效应几乎不存在相互影响;随P5和D r 的增大,邓肯E-B模型参数K、K b 增大,且P5越高D r 对K、K b 的影响越显著,D r 越大时P5对K、K b 的影响越强烈,存在相互影响效应;提出了考虑级配与D r 双重影响的强度指标和变形参数经验计算公式,该公式能高精度预测鄱阳湖地区级配不良偏细砂砾石覆盖层料的力学指标。
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| 关 键 词： | 砂砾石料 颗粒级配 强度指标 变形 力学特性 相对密度 鄱阳湖地区 |
| 收稿时间： | 2023-04-25 |
Mechanical properties of poorly-graded sandy gravel with high content of fine particles in Poyang Lake area |
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| WU Ping,LING Hu,SHI Beixiao,FU hu,HAN Huaqiang. Mechanical properties of poorly-graded sandy gravel with high content of fine particles in Poyang Lake area[J]. Journal of Hohai University (Natural Sciences ), 2024, 52(2): 69-76 |
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| Authors: | WU Ping LING Hu SHI Beixiao FU hu HAN Huaqiang |
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| Affiliation: | China Railway Water Resources and Hydropower Planning and Design Group, Nanchang 330029, China;Department of Geotechnical Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China;MWR Key Laboratory of Reservoir Dam Safety, Nanjing 210029, China |
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| Abstract: | A series of large-scale triaxial tests are conducted on the influence of particle grading and relative density on the strength and deformation characteristics of sandy gravel with high content of particles smaller than 5 mm. It shows that the compaction performance of sandy gravel decreases with the increasing mass fraction of particle less than 5 mm. Strength parameters and deformation parameters increase with the increase of the mass fraction of particles larger than 5 mm P 5 and relative density Dr. The strength parameters, c, φ, φ 0 and Δ φ ,increase linearly with the growth of P 5 and Dr, and there is almost no interaction between influences of P 5 and Dr on strength parameters. The test results also show that the Duncan E-B model parameters K and K b increase with the growth of P 5 and Dr, the effects of Dr on K and K b are greater for sandy gravel with higher content of particles larger than 5 mm, and the effects of P 5 on K and K b are more significant for sandy gravel with higher relative density. The empirical formulas, considering the effects of particle grading and Dr, are proposed to predict mechanical properties and Duncan E-B model parameters, and the formulas have high precision in prediction of mechanical indexes of poorly-graded sandy gravel with high content of fine particles for overburden in Poyang Lake area. |
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| Keywords: | sandy gravel particle gradation strength index deformation mechanical properties relative density Poyang Lake area |
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