蔡新合,陈子玉,李国英. 考虑颗粒破碎能耗的堆石料剪胀方程及其应用[J]. 水利水运工程学报.. doi: 10.12170/20230613002
引用本文: 蔡新合,陈子玉,李国英. 考虑颗粒破碎能耗的堆石料剪胀方程及其应用[J]. 水利水运工程学报.. doi: 10.12170/20230613002
(CAI Xinhe, CHEN Ziyu, LI Guoying. Shear dilatancy equation of rockfill considering particle breakage energy consumption and its application[J]. Hydro-Science and Engineering(in Chinese)). doi: 10.12170/20230613002
Citation: (CAI Xinhe, CHEN Ziyu, LI Guoying. Shear dilatancy equation of rockfill considering particle breakage energy consumption and its application[J]. Hydro-Science and Engineering(in Chinese)). doi: 10.12170/20230613002

考虑颗粒破碎能耗的堆石料剪胀方程及其应用

Shear dilatancy equation of rockfill considering particle breakage energy consumption and its application

  • 摘要: 堆石料由于粒径较大、颗粒棱角过多,在试验中颗粒破碎现象较为显著。通过分析砂砾料和堰塞料两种堆石料三轴试验结果,在剑桥模型剪胀方程中引入颗粒破碎耗能系数,并结合广义塑性模型的理论框架对两种堆石料的试验结果进行数值验证。主要结论如下:(1)试验过程中颗粒破碎耗能系数与剪切应变的关系呈先增后减的趋势,可以采用单峰曲线描述其发展规律;(2)引入颗粒破碎耗能系数的剪胀方程可以反映两种堆石料剪胀曲线的非线性特征;(3)考虑颗粒破碎的剪胀方程结合广义塑性模型可以拟合出两种堆石料的应力应变曲线,能够反映其应变硬化和剪缩、剪胀特性。

     

    Abstract: Acknowledging the significance of particle breakage in rockfill due to its large size and angularity, this study incorporates the particle breakage energy dissipation coefficient into the stress-dilatancy relationship of the Cambridge model. Triaxial test results on sand gravel and landslide dam materials validate this modification within the theoretical framework of the generalized plastic model. Key findings include: (1) The energy consumption coefficient of particle breakage exhibits a unimodal curve, initially increasing and then decreasing with shear strain during testing. (2) The modified stress-dilatancy relationship captures the non-linear characteristics of shear-dilation curves for both rockfill types. (3) The stress-strain curves of diverse materials align well with the stress-dilatancy relationship, incorporating particle breakage and the generalized plastic model, showcasing traits of strain hardening, shear compaction, and shear dilatancy.

     

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