堆石蠕变与颗粒破碎特性三轴试验  

Creep and Particle Breakage Behavior of Rockfill in Triaxial Compression Testing

作　　者：王琛[1,2] 詹传妮[2] 何鹏[1,2] 张建卫[2] 李黎[2] 

机构地区：[1]四川大学水力学与山区河流开发保护重点实验室,成都610065 [2]四川大学水利水电学院,成都610065

出　　处：《土木建筑与环境工程》2011年第5期57-62,共6页Journal of Civil,Architectural & Environment Engineering

基　　金：国家自然科学基金青年科学基金(50909068)

摘　　要：为分析堆石的蠕变规律和研究颗粒破碎与蠕变的关系,对某堆石料进行了不同应力水平和围压下的大型三轴排水蠕变试验。蠕变试验后通过筛分试验测量了堆石的颗粒破碎程度。结果表明堆石的蠕变变形与应力水平和围压有关;轴向蠕变和体积蠕变随应力水平的增大而增大,应力水平相同时则随围压增大而增大。堆石的应变-时间关系可用幂函数表示,轴向应变-应力关系和体积应变-应力关系分别满足双曲线函数和线性比例函数。随应力水平和围压的增大,堆石颗粒破碎增多。堆石颗粒破碎可用相对颗粒破碎指数度量,其与轴向蠕变和体积蠕变近似呈线性比例关系。In order to investigate the creep laws and the relation between particle breakage and creep strain of some certain rockfill, a series of constant-stress drained creep tests were conducted on rockfill materials with the large scale triaxial apparatus. Tests were carried out under different confining pressures and stress levels. Particle breakage degrees of this rockfill were measured by sieve test after creep tests. It is indicated that creep deformation of rockfill has something to do with confining pressures and the stress levels. The axial creep strain and the volumetric creep strain increase with the increase of stress levels, and also increase with the increase of confining pressures under same stress level. The strain-time relation can be described with power function. The stress-axial strain and stress-volumetric strain behavior can be described with hyperbolic and linear function, respectively. Particle breakage degrees increase with the increase of stress levels and confining pressures. The relative particle breakage index can be adopted to descript the particle breakage of rockfill. And the axial creep strain and volumetric creep strain are linearly dependent on this index.

关 键 词：蠕变 堆石 颗粒破碎 压缩试验 

分 类 号：TU411.3[建筑科学—岩土工程]