摘要
以弹性理论为基础,提出一种单桩非线性沉降分析新模型。提出的模型可同时考虑桩底土的非线性、桩侧界面接触非线性及桩周土体受剪的非线性变形。该模型中,假设土体作用力只对其位置产生非线性变形,而对其他位置则产生线性变形。非线性位移影响因子根据现场荷载试验或由荷载-位移双曲线关系得到,而线性位移影响因子则采用弹性理论的Mindlin解进行计算。采用刚塑性模型处理桩土界面的接触非线性,借鉴荷载传递法的合理成分,既考虑土体的连续性,同时又考虑其位移传递能力的有限性,因而更为合理实用。2个工程实例的计算结果表明,该模型与实测结果吻合较好。
Based on the elastic theory method,a new nonlinear model for single pile settlement analysis is proposed.The nonlinearity of soil deformation under the pile bottom or the pile side,and the contact nonlinearity at the interface between the pile and soil are considered.The model assumes that any force in soil can cause nonlinear displacement at the place where it acts on and linear displacement at other place.The nonlinear displacement influence factor is calculated by the hyperbolic relation between load and displacement,which can be obtained from the in-situ load tests or derived from the basic parameters of soil.The linear displacement influence factor is calculated with the Mindlin solution,which is derived from the elastic theory.A rigid-plastic interface model for the pile-soil interface is adopted.The new model combines the advantages of load-transfer model and elastic theory model for single pile analysis,and considers both the continuity of soil and the capacity of displacement transfer of soil.The detailed processes of the displacement vectors of soil segments and pile segments and parameters choice method for the model are given.Calculation results of two examples show they agree well with test data.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2006年第z2期3474-3481,共8页
Chinese Journal of Rock Mechanics and Engineering
关键词
桩基工程
单桩
沉降
非线性
MINDLIN解
pile foundation
single pile
settlement
nonlinearity
Mindlin solution
