紫坪铺面板坝堆石料颗粒破碎试验研究  

Experimental study of particle breakage of Zipingpu rockfill material

作　　者：孔宪京[1,2] 刘京茂[2] 邹德高[1,2] 付猛[2] 

机构地区：[1]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116024 [2]大连理工大学水利工程学院,辽宁大连116024

出　　处：《岩土力学》2014年第1期35-40,共6页Rock and Soil Mechanics

基　　金：地震行业科研专项经费项目(No.201208013);国家自然科学基金(No.51279025;No.51379028);新世纪优秀人才支持计划资助(No.NCET-12-0083)

摘　　要：采用大型三轴仪对紫坪铺面板坝堆石料进行了单调和循环荷载下的固结排水剪切试验,研究了不同孔隙比情况下颗粒破碎及剪胀的变化规律。试验表明:(1)单调和循环荷载条件下,堆石料颗粒破碎率与塑性功之间存在一致的双曲线关系;(2)峰值应力处剪胀率与颗粒破碎率在半对数坐标中呈近似线性关系;(3)峰值应力处主应力比与相应的剪胀率呈近似线性关系,且上述结果受初始孔隙比的影响不大。研究成果有助于进一步了解堆石料的颗粒破碎特点,对建立复杂应力条件下考虑颗粒破碎和状态相关性的弹塑性本构模型,分析紫坪铺面板堆石坝汶川地震破损机制是十分有益的。A series of large-scale consolidated drained triaxial tests were conducted to research particle breakage of Zipingpu rockfill material under monotonic and cyclic loading for different initial void ratios. The results show that there exists a hyperbolic relation between the input plastic work and particle breakage, regardless of the initial void ratio or confining pressure under both monotonic and cyclic loading. The dilatancy factor at peak decreases with the increasing of particle breakage and there exists a nearly linear relation between particle breakage at peak and the dilatancy factor at peak on semilog coordinate, irrespective of initial void ratio. Test results in this study also indicate that there exists an approximate linear relation between peak principal stress ratio and the dilatancy factor at peak, regardless of the initial void ratio. This study results can provide useful references for state-dependent elastic-plastic constitutive model considering particle breakage and finite element analysis of Zipingpu concrete face dam during Wenchuan earthquake; and help to further understand the particle breakage of rockfill materials.

关 键 词：堆石料 颗粒破碎 三轴试验 

分 类 号：TU411[建筑科学—岩土工程]