摘要
通过对比分析碎石土加筋前后高压大三轴饱和固结排水试验结果 ,研究碎石土加筋的抗剪强度特性。结果表明 :加筋碎石土复合体的应力 -应变 -体变关系仍然表现出不加筋碎石土的基本特性 ,加筋后的应力 -应变 -体变曲线比不加筋前显著提高 ,其本构关系可用邓肯 -张双曲线模型来描述。不论加筋与否 ,碎石土的加卸荷循环曲线基本都呈相互平行的直线。加筋增强了碎石土抵抗变形和破坏的能力 ,碎石土加筋的效果可以显著提高凝聚力 ,但对其内摩擦角影响很小。颗粒越粗硬 ,对提高强度、减小变形越有利。
A research about the shear strength of gallet is carried out by comparison of the outcomes of high pressure and large scale triaxial tests of reinforced and unreinforced gallet.It is shown that the essential properties of unreinforced gallet are issued out in the curves of stress strain volumetric strain of the compound of gallet and geogrid, but the curves are higher evidently than those of gallet which show that the compound's abilities to resist deformation and failure are strengthened.By reinforcement,the cohesion of the compound is remarkably increased but the friction angle remains the same. The constitutive relation can be described by the Duncan Chang model.Loading unloading curves of gallet are parallel lines.It is also shown that the larger the diameter of the gallet and the harder the gallet, the higher the shear strength,the better the properties to reduce deformation of the compound.
出处
《大坝观测与土工测试》
2000年第5期44-47,共4页
Dam Observation and Geotechnical Tests
关键词
加筋碎石土
应力-应变-体变关系
抗剪强度
reinforced gallet
stress strain volumetric strain relationship
shear strength
Duncan Chang model,reinforcement function
