摘要
饱和砂砾料动力特性是土石坝工程中的难点问题之一,由于试验仪器、费用等原因,在动三轴试验时多把砂砾料中的大颗粒剔除,导致试样试验结果与实际坝体砂砾料的性质存在尺寸效应。对不同直径的试样进行动三轴试验,分析对比不同直径砂砾料的动力变形特性的尺寸效应。结果表明,砂砾料的动力变形存在"拐点粒径"效应,小直径试样的动应变规律类似松砂;大直径试样的动应变发展与密砂类似;不同直径试样的往返剪应力相差较大,因此,必须考虑尺寸效应对砂砾料动力变形特性影响,其对于砂粒料动力反应的数值分析具有重要意义。
Sandy-gravel material was considered as materials which have high anti-liquefaction strength because it＇s high hydraulic permeability and have coarse grain. The big grain in the sandy-gravel often rejected when the cyclic test was carried out due to the restriction of the equipments and cost. The cyclic tests were carried out for the samples with the different diameters respectively. The results show that the extremely distinct size effect of sand-gravel material exists among the dynamic strain of different diameter samples. So, it is necessary to consider the size effect of dynamic deformation of sandy-gravel material. Which has a important significance for the numerical analysis on dynamic reaction of sandy-gravel material.
出处
《港工技术》
2009年第1期30-34,共5页
Port Engineering Technology
关键词
尺寸效应
砂砾料
动应变
size effect
sand-gravel material
dynamic strain
