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

作　　者：蔡新合[1] 陈子玉 李国英[2] CAI Xinhe;CHEN Ziyu;LI Guoying(PowerChina Northwest Engineering Corporation Limited,Xi’an 710065,China;Nanjing Hydraulic Research Institute,Nanjing 210029,China)

机构地区：[1]中国电建集团西北勘测设计研究院有限公司,陕西西安710065 [2]南京水利科学研究院,江苏南京210029

出　　处：《水利水运工程学报》2024年第3期127-135,共9页Hydro-Science and Engineering

基　　金：国家自然科学基金-雅砻江联合基金重点项目(U1765203)。

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。结果表明:(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。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.

关 键 词：剪胀方程 颗粒破碎 堆石料 广义塑性模型 

分 类 号：TU43[建筑科学—岩土工程]