中文摘要：

基于球形空腔扩张及一维径向固结理论,对桩端后注浆桩的桩端注浆残余应力进行理论研究,分析了残余应力的消散过程,在负指数衰减的初始超孔隙压力分布基础上,得到了残余应力随时间及扩散半径消散的解析解;同时将提出的方法与未考虑浆液扩散半径影响的简化方法进行了比较,对模型的主要影响参数进行了分析。参数分析显示,流变指数、稠度系数、土体的压缩模量及固结时间是影响注浆残余应力的关键因素;另外,通过试验实测数据对新方法及简化计算方法进行了验证,结果表明,新计算方法能有效地模拟后注浆残余应力的消散。其研究结果对后注浆残余应力的理论研究及工程实践有重要的指导价值。

英文摘要：

Residual stresses at the pile pit during pressure grouting are studied theoretically based on the solutions of expansion of spherical cavity and one-dimensional consolidation.By analyzing of the dissipation process of residual stresses,the analytical solutions of residual stresses dissipation with time and diffusion radius are obtained for assumed initial exponential pore pressure distribution.Also,a simplified solution discarding effect of grout spread radius is compared with the present method for different relative parameters.Parametric studies show that rheological index,consistency index,compression modulus and consolidation time are the key issues affecting pile residual stresses.In addition,the validity of the proposed model is tested by comparing the results from field measurements.This research is great important for the theoretical studies and practical applications of the residual stresses.