摘要
结合沉管砂桩与强夯法联合加固吹填土地基的现场试验,研究强夯过程中夯坑沉降量的变化过程、地层孔隙水压力的增长和消散规律及其空间分布特征。结果表明,随强夯遍数的增加,夯坑沉降量呈现明显的减小的趋势;强夯荷载作用下,地层中孔隙水压力的上升是十分明显的,且随离开强夯点水平距离的增大,最大孔隙水压力出现的深度有所下移。利用上述方法加固后,吹填软土地基的承载力特征值可达到143 kPa。
According to the field tests of saturated hydraulic fill foundation using combined sand piles and dynamic consolidation method, this paper analyzes the depth of pit versus the numbers of drop in various numbers of pass, the development and dissipation of pore pressure, the distributions of pore pressure in space. Test results show that the depth of pit decreases obviously with increasing the number of dynamic passes. Under dynamic loading, pore pressure of soil layers increases rapidly. Furthermore, the maximum pore pressure moves toward the depth of soil layer with increasing the distances from dynamic point. The bearing capacity of reinforced ground can reach 143kPa by the combined sand piles and dynamic consolidation method.
出处
《建筑科学》
北大核心
2011年第9期55-60,共6页
Building Science
关键词
砂桩
吹填土
强夯
地基承载力
sand pile
hydraulic fill foundation
dynamic consolidation
bearing capacity
