水泥改良粉细砂地层路基沉降及受力特性研究

以浩吉铁路为依托，通过理论分析、数值模拟和现场监测等手段，对粉细砂改良地层的变形和受力特性进行研究。结果表明:改良后的粉细砂地层能够有效降低路基的沉降和动应力，并保持稳定；路基两侧的沉降随时间逐渐增大，在达到峰值后发生小幅回弹并趋于稳定，而路基中心的沉降表现为明显的早期迅速增大，增长放缓和趋于稳定的三阶段特性；路基中心的静土压力在时间上表现为波动变化，在空间上随着深度的增大而近似线性增大。

Study on the Subgrade Settlement and Mechanical Characteristics of Fine Silty Sand Subgrade Improved by Cement

Based on Haoji Railway, through theoretical analysis, numerical simulation and field monitoring methods, the deformation and mechanical characteristics of fine silty sand improved stratum are studied. The results show that: the improved fine silty sand stratum can effectively reduce the settlement and dynamic stress of the subgrade and keep it stable. The settlement on both sides of the subgrade gradually increases with time, and after reaching the peak, it rebounding slightly and tends to be stable. However, the settlement in the center of the subgrade shows a three-stage characteristic of rapid increase in the early stage, slow growth and gradually stable. The static earth pressure in the center of the subgrade fluctuates slightly in time and increases linearly with the increase of depth in space.