堆石料颗粒破碎特性及Wan-Guo硬化法则的修正

孙大伟; 张亮; 徐志华; 张国栋

doi:10.11779/CJGE202004018

堆石料颗粒破碎特性及Wan-Guo硬化法则的修正 English Version

孙大伟^{1, 2,},
张亮^{1, 2},
徐志华^{1, 2},
张国栋^{1, 2}

1.
防灾减灾湖北省重点实验室,湖北　宜昌　443002
2.
三峡库区地质灾害教育部重点实验室（三峡大学）,湖北　宜昌　443002

基金项目:

国家自然科学基金项目 51179097

详细信息

作者简介:
孙大伟(1971—),男,博士,副教授,主要从事粗粒土工程试验、本构模型和数值计算方面的研究工作。E-mail: daweisun@126.com

中图分类号: TU431
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出版历程
- 收稿日期: 2019-02-24
- 网络出版日期: 2022-12-07
- 刊出日期: 2020-03-31

Particle breakage characteristics of rockfill materials and correction of Wan-Guo hardening rule

SUN Da-wei^{1, 2,},
ZHANG Liang^{1, 2},
XU Zhi-hua^{1, 2},
ZHANG Guo-dong^{1, 2}

1.
Hubei Key Laboratory of Disaster Prevention and Mitigation, Yichang 443002, China
2.
Key Laboratory of Geological Hazards on Three Gorges Reservoir Area (China Three Gorges University), Ministry of Education, Yichang 443002, China

摘要

摘要: 高应力下超高堆石坝坝料的颗粒破碎特性是当前研究的热点问题。取已建成的世界最高面板堆石坝——水布垭坝的筑坝堆石料为试验料,进行了轴向应变达25%的三轴固结排水试验,得到了31组试验的高质量试验数据。在此基础上,统计分析得出临界状态剪应力q与平均主应力p呈幂函数关系、颗粒破碎率 $B_{r}$ 与围压 $σ_{3}$ 呈幂函数关系、临界状态应力比 $M_{f}$ 与围压 $σ_{3}$ 呈对数函数关系。试验揭示了在高–超高围压下堆石料发生了较显著颗粒破碎,堆石料粒径变小、颗粒级配改变导致其剪应力–轴向应变试验曲线下弯。因此高围压下堆石料的临界状态判断标准应为“体应变不变”,而不再是“剪应力不变”。最后引入破碎因子项,修正了Rowe剪胀方程的Wan-Guo硬化法则。
- 堆石坝 /
- 本构模型 /
- 三轴试验 /
- 颗粒破碎 /
- 状态相关
Abstract: The particle breakage problem of super-high rockfill dams is a hot issue in the current researches. For the rockfill materials of the world's highest concrete faced rockfill dam, Shuibuya Dam, the consolidated drained tri-axial tests with the maximum deformation of 25% are carried out, and 31 high-quality test curves are obtained. On this basis, the power function relationship between the critical shear stress and the mean stress is yielded, so is the relationship between the particle breakage ratio and the confining pressure. The logarithmic function relationship between the critical state stress ratio and the confining pressure is obtained. The test data reveal that obvious particle breakage of the rockfill materials happens under high or super high pressures. The particle size of many rockfill materials becomes smaller and its grading curve changes, which induces the shear stress and axial strain test curve to bend down. Therefore, the criterion for the critical state of rockfill materials under high confining pressures must be "strain unchanged volumetric" rather than "shear stress unchanged". Finally, the Wan-Guo hardening rule of Rowe’s stress dilatancy equation is modified by use of the breakage factor term.
- rockfill dam /
- constitutive model /
- triaxial test /
- particle breakage /
- state-dependence

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图 1 体应变、剪应力–轴应变曲线

Figure 1. Relationship among volumetric strain shear stress and axial strain

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图 2 剪应力q与平均主应力p幂函数关系

Figure 2. Power relationship between shear stress and main stress

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图 3 围压与相对破碎率幂函数曲线

Figure 3. Power relationship between confining pressure and relative breakage ratio

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图 4 临界状态应力比M_f – $σ_{3}$ 关系

Figure 4. Relationship between confining pressure and stress ratio in critical state

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图 5 试验前后级配曲线

Figure 5. Grading curves before and after tests

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图 6 不同围压下拟合的 $\sin φ_{m}$ - $ε_{s}^{p}$ 关系曲线

Figure 6. Relationship between $\sin φ_{m}$ and $ε_{s}^{p}$ under different values of confining pressure

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