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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。
Based on the theory of spherical cavity expansion and one-dimensional radial consolidation theory, the residual stress of the grouting pile at the pile tip is studied theoretically. The dissipation process of residual stress is analyzed. In the case of negative exponential decay, the initial excess pore pressure distribution Based on the analysis, the analytical solutions of the residual stress dissipated with time and diffusion radius are obtained. At the same time, the proposed method is compared with the simplified method without considering the influence of the diffusion radius of the slurry. The main influence parameters of the model are analyzed. The parameter analysis shows that the rheological index, consistency coefficient, compressive modulus of soil and consolidation time are the key factors affecting the grouting residual stress. In addition, the new method and the simplified calculation method are verified by the measured data. The results show that The new calculation method can effectively simulate the dissipation of post-grouting residual stress. The results of this study have important guiding value for the theoretical research and engineering practice of post-grouting residual stress.