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Dynamic strength is an important parameter for dam stability and safety analysis, which is of great significance to engineering design. Variable amplitude cyclic loading and unloading test was carried out to explore the effect of different confining pressure and cement content on the dynamic stress-strain relationship of cemented sand gravel (CSG) material by large dynamic triaxial instrument. Based on the Mohr Coulomb strength criterion, the evolution law of dynamic strength parameters of CSG materials during plastic deformation was studied by taking the dynamic strain as the plastic internal variable. The results show that the dynamic cohesion and dynamic internal friction angle increase with the increase of cement content. As the dynamic strain increases, the dynamic cohesion decreases rapidly, the dynamic internal friction angle increases, and the friction force generated by the shear slip between the aggregates dominates. When the peak dynamic stress is reached, the effective stress surface between aggregates decreases obviously, the dynamic cohesion decreases gently, the dynamic internal friction angle decreases with a certain hysteresis. The law of dynamic cohesion with dynamic strain conforms to the power function relationship. The law of dynamic internal friction angle and dynamic strain change conforms to the quadratic function relationship. The research results can provide a theoretical reference for the optimization of seismic design of CSG dam.

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动强度是大坝稳定安全分析的重要参数,对工程设计具有重要意义。采用大型动三轴仪,开展变幅循环加卸载试验,探究了不同围压和水泥含量对胶凝砂砾石(CSG)材料动应力—动应变关系的影响;基于摩尔—库伦强度准则,以动应变为塑性内变量,研究了CSG材料在经历塑性变形时其动强度参数的演化规律。结果表明,动粘聚力和动内摩擦角随水泥含量增大而增加;随着动应变增加,动粘聚力下降较快,动内摩擦角增加,骨料间的剪切滑移产生的摩擦力起主导作用;达到峰值动应力时,骨料间的有效受力面明显减小,动粘聚力下降平缓,动内摩擦角减小,具有一定的滞后性。动粘聚力随动应变变化的规律符合幂函数关系;动内摩擦角与动应变变化的规律符合二次函数关系。研究结果可为CSG坝的抗震设计优化提供理论参考。

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黄虎(1981-),男,博士、副教授、硕导,研究方向为筑坝新材料的力学试验和数值分析,E-mail:

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黄虎(1981-),男,博士、副教授、硕导,研究方向为筑坝新材料的力学试验和数值分析,E-mail:

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黄虎(1981-),男,博士、副教授、硕导,研究方向为筑坝新材料的力学试验和数值分析,E-mail:

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变幅循环荷载下胶凝砂砾石材料的动强度特性研究
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黄虎 , 熊衍来 , 曹克磊 , 张献才
水电能源科学 | 水利水电工程 2023,41(3): 161-164
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水电能源科学 | 水利水电工程 2023, 41(3): 161-164
变幅循环荷载下胶凝砂砾石材料的动强度特性研究
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黄虎 , 熊衍来, 曹克磊, 张献才
作者信息
  • 华北水利水电大学水利学院,河南 郑州 450046
  • 黄虎(1981-),男,博士、副教授、硕导,研究方向为筑坝新材料的力学试验和数值分析,E-mail:

Dynamic Strength Characteristics of Cemented Sand and Gravel Material Under Variable Amplitude Cyclic Loading
Hu HUANG , Yan-lai XIONG, Ke-lei CAO, Xian-cai ZHANG
Affiliations
  • School of Water Conservancy, North China University of Water Resources and Electric Power, Zhengzhou 450046, China
出版时间: 2023-03-25 doi: 10.20040/j.cnki.1000-7709.2023.20220625
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动强度是大坝稳定安全分析的重要参数,对工程设计具有重要意义。采用大型动三轴仪,开展变幅循环加卸载试验,探究了不同围压和水泥含量对胶凝砂砾石(CSG)材料动应力—动应变关系的影响;基于摩尔—库伦强度准则,以动应变为塑性内变量,研究了CSG材料在经历塑性变形时其动强度参数的演化规律。结果表明,动粘聚力和动内摩擦角随水泥含量增大而增加;随着动应变增加,动粘聚力下降较快,动内摩擦角增加,骨料间的剪切滑移产生的摩擦力起主导作用;达到峰值动应力时,骨料间的有效受力面明显减小,动粘聚力下降平缓,动内摩擦角减小,具有一定的滞后性。动粘聚力随动应变变化的规律符合幂函数关系;动内摩擦角与动应变变化的规律符合二次函数关系。研究结果可为CSG坝的抗震设计优化提供理论参考。

胶凝砂砾石材料  /  变幅循环荷载  /  塑性阶段  /  动粘聚力  /  动内摩擦角

Dynamic strength is an important parameter for dam stability and safety analysis, which is of great significance to engineering design. Variable amplitude cyclic loading and unloading test was carried out to explore the effect of different confining pressure and cement content on the dynamic stress-strain relationship of cemented sand gravel (CSG) material by large dynamic triaxial instrument. Based on the Mohr Coulomb strength criterion, the evolution law of dynamic strength parameters of CSG materials during plastic deformation was studied by taking the dynamic strain as the plastic internal variable. The results show that the dynamic cohesion and dynamic internal friction angle increase with the increase of cement content. As the dynamic strain increases, the dynamic cohesion decreases rapidly, the dynamic internal friction angle increases, and the friction force generated by the shear slip between the aggregates dominates. When the peak dynamic stress is reached, the effective stress surface between aggregates decreases obviously, the dynamic cohesion decreases gently, the dynamic internal friction angle decreases with a certain hysteresis. The law of dynamic cohesion with dynamic strain conforms to the power function relationship. The law of dynamic internal friction angle and dynamic strain change conforms to the quadratic function relationship. The research results can provide a theoretical reference for the optimization of seismic design of CSG dam.

cemented sand and gravel material  /  variable amplitude cyclic loading  /  plastic stage  /  dynamic cohesion  /  dynamic internal friction angle
黄虎, 熊衍来, 曹克磊, 张献才. 变幅循环荷载下胶凝砂砾石材料的动强度特性研究. 水电能源科学, 2023 , 41 (3) : 161 -164 . DOI: 10.20040/j.cnki.1000-7709.2023.20220625
Hu HUANG, Yan-lai XIONG, Ke-lei CAO, Xian-cai ZHANG. Dynamic Strength Characteristics of Cemented Sand and Gravel Material Under Variable Amplitude Cyclic Loading[J]. Water Resources and Power, 2023 , 41 (3) : 161 -164 . DOI: 10.20040/j.cnki.1000-7709.2023.20220625
  • 河南省科技攻关项目(192102310224)
  • 国家自然科学基金项目(52109154)
2023年第41卷第3期
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doi: 10.20040/j.cnki.1000-7709.2023.20220625
  • 接收时间:2022-03-31
  • 首发时间:2026-01-28
  • 出版时间:2023-03-25
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  • 收稿日期:2022-03-31
  • 修回日期:2022-05-02
基金
河南省科技攻关项目(192102310224)
国家自然科学基金项目(52109154)
作者信息
    华北水利水电大学水利学院,河南 郑州 450046
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2种不同金属材料的力学参数

Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)

Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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