基于非均质地层模型的桩基注浆数值模拟

桩周后注浆技术是提高桩基承载力的重要措施。结合某工程勘察获得的场地土层物理参数,基于随机分形方法,运用Diamond-Square算法构建随机非均质地层模型;考虑桩基周围注浆过程中土层孔隙率、渗透率以及其他参数的动态变化过程,结合流体运动方程进行数值模拟。分析注浆过程中桩基周围土层物理参数的实时动态变化,获得浆液扩散及结石体的不规则分布情况;注浆后桩侧和桩端周围土体、结石体力学特性显著改善,桩周注浆加固效果明显。基于非均质地层模型开展注浆数值模拟计算,可以指导和评价桩周注浆加固过程。

Numerical Simulation of Pile Foundation Grouting Based on Inhomogeneous Formation Model

Post-grouting technique is an important means of improving the bearing capacity of pile foundation. Ac-cording to the field physical parameters of soil layers at a project,an inhomogeneous formation model is constructed via Diamond-Square algorithm based on the random fractal theory. In consideration of changes in soil porosity,per-meability and other parameters during grouting around pile foundation,the grouting process is simulated in associa-tion with the equation of fluid motion. Through analyzing the real-time dynamic changes of physical parameters of soil layers,the irregular distribution of slurry dispersion and stone body are obtained. The mechanical properties of soil and stone around the pile has improved significantly after grouting,indicating an obvious reinforcement effect. Numerical simulation of grouting based on inhomogeneous formation model could be used to guiding and evaluating the reinforcement process of pile grouting.