摘要
基于圆孔扩张理论,假定散体材料桩与桩周土均满足完全弹性、各向同性和连续性条件,在侧向桩与土的分界面上满足变形协调条件和应力平衡方程,在竖向视桩-土变形相等,得到了桩土应力比的理论计算公式。引入了桩-土弹性模量比Kn及桩竖向-侧向应力比n',分析了桩-土弹性模量比、置换率、桩泊松比及桩周土泊松比等4个参数对桩土应力比和桩竖向-侧向应力比的影响。研究结果表明:桩土应力比和桩竖向-侧向应力比随桩-土弹性模量比的增大而增大,随桩、土泊松比及置换率的增大而减小。并在此基础上,利用桩土应力比现场实测结果对理论计算结果进行了验证,数据表明两者吻合较好。
Based on the theory of cavity expansion,the granular pile and soil around pile were treated as a perfectly elastic,isotropic,homogeneous continuous medium,and were assumed to satisfy the compatibility conditions of deformation and stress balance equation in the lateral pile-soil interface,and their vertical deformation was assumed to be equal.The theoretical calculation formula of pile-soil stress ratio was obtained.The pile-soil modulus ratio Knand vertical-lateral stress ratio n’ were introduced as two new parameters.Then the effects of 4 parameters,which are pile-soil elasticity modulus ratio,replacement rate,pile Poisson’ s ratio and soil Poisson’ s ratio,on pile-soil stress ratio and vertical-lateral stress ratio were investigated.The results show that：the pile-soil stress ratio increases with the increase of the elastic modulus ratio,while decreases with the increase of pile Poisson’s ratio,soil Poisson’s ratio and replacement ratio,and the vertical-lateral stress ratio follows the same rules.Moreover,it is proved that the theoretical results agree with the measured data well by a field test.
作者
田莉
韩冉冉
TIAN Li;HAN Ran-ran(Tianjin Research Institute for Water Transport Engineering,National Engineering Laboratory for Port Hydraulic Construction Technology,Key Laboratory of Harbor ＆ Marine Structure Safety,Ministry of Transprot,Tianjin 300456,China)
出处
《水道港口》
2018年第3期348-354,共7页
Journal of Waterway and Harbor
关键词
散体材料桩
应力比
弹性模量比
泊松比
置换率
granular pile
stress ratio
elasticity modulus ratio
Poisson’s ratio
replacement rate
