碾压混凝土直剪试件细观结构的数值模拟  

Numerical Simulation of Shear Test of Specimen Roller Compacted Concrete on Meso-Level

作　　者：彭一江[1] 黎保琨[2] 屈彦玲[2] 

机构地区：[1]北方交通大学,北京100044 [2]北京工业大学,北京100044

出　　处：《三峡大学学报（自然科学版）》2003年第6期492-494,561,共4页Journal of China Three Gorges University：Natural Sciences

摘　　要：从细观层次上将碾压混凝土试件当作是由硬化水泥粉煤灰砂浆、粗骨料、二者间的粘结带以及水泥砂浆中间层面组成的非均质复合材料,由随机骨料模型模拟碾压混凝土的细观结构,用非线性有限元法模拟试件在直剪作用下的细观损伤断裂,从而求得其宏观抗剪断强度.计算结果与《混凝土重力坝设计规范》所提供的参考值较为吻合,据此还进行了试件破坏机理分析.应用此种计算方法,可节省直剪试验工作量,并可进行直剪试件的尺寸效应分析,有广阔的应用前景.The RCC is taken as two-phase composites consisting of mortar smut matrix, aggregate and bond between matrix and aggregate on meso-level. This random aggregate model is used to simulate the structure of RCC. The propagation processes of cracks and the mechanical properties of RCC in shear test are simulated u-sing finite element method. The simulation results agree with the Design Specification and test results. This numerical method is a new conception for investigating fracture mechanism and mechanical properties of RCC.

关 键 词：碾压混凝土 直剪试验 细观结构 数值模拟 粉煤灰砂浆 碾压混凝土坝 

分 类 号：TV642.2[水利工程—水利水电工程]