摘要
通过合宁快速客运专线膨胀土地段的现场动力试验,分析不同匹配刚度路堤在模拟列车动荷载作用下的工程特性。不同刚度路堤的测试结果表明:(1)不同刚度路堤动应力变化基本相同,基床范围内实测动应力与理论计算结果较接近;(2)弹性变形差异小,分别为0.32和0.29mm;(3)基床表层级配碎石受水或饱水后基床系数会显著降低,动刚度系数约为317MPa/m,暴雨后下降到220MPa/m;(4)塑性变形在加载开始阶段变化较快,振动150万次后塑性变形分别为0.9和1.1mm,塑性变形主要由级配碎石产生,改良土基本没有塑性变形。
By in-situ dynamic test on expansive soil section in different rigidity embankments along Hefei— Nanjing rapid railway,the engineering characters of the different rigidity embankments were studied under the simulated train dynamic loads.It is verified that(1) the variations of dynamic stress of the embankments with different rigidities are the same,and the test values are close to the computed ones,(2) the elastic deformations of the embankments with different rigidities are 0.32 and 0.29 mm respectively,(3) road bedding coefficient can be significantly decreased after the graded broken stones are saturated,and the dynamic rigidity coefficient of the embankment is about 317 and 220 MPa/m after storm,and(4) the plastic deformation of the embankments with different rigidities increases rapidly at the beginning of the dynamic loadings.After the vibration times of 15 million,the plastic deformations are 0.9 and 1.1 mm respectively,which are mainly caused by the graded broken stones,and the improved soil nearly has no plastic deformation.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2006年第z2期4204-4208,共5页
Chinese Journal of Rock Mechanics and Engineering
基金
中国博士后科学基金资助项目(2005037150)
关键词
土力学
膨胀土
路堤合理刚度
动应力
变形
soil mechanics
expansive soil
embankment proper rigidity
dynamic stress
deformation
