超浅埋管幕箱涵顶进法施工稳定性数值模拟分析

依托下穿既有南昌大桥人行通道工程项目，采用有限差分法模拟箱涵顶进过程，分析箱涵顶推力变化下路基变形规律，并对地表沉降进行了监测。研究结果表明:顶推力、注浆压力变化对路基沉降槽分布范围影响较小；顶推力会对地表沉降纵向分布产生影响，顶推力越大，地表沉降空间分布越不均匀；注浆压力的改变会对地表沉降槽的形状产生影响。

Numerical Simulation Analysis of Stability of Construction by Extremely Shallow Buried Pipe Curtain-box Culvert Jacking Method

Based on the project of pedestrian path undercrossing the existing Nanchang Bridge, finite difference method was used to simulate the process of box culvert jacking herein, and the law of subgrade deformation with the jacking force was analyzed with the supervision on the surface settlement. The result shows that, the changes of the jacking force and grouting pressure have less influence on the distribution range of settling tank; the jacking force will affect the longitudinal distribution of the surface settlement in such manner that the greater the jacking force, the less even spacial distribution of surface settlement; the variation of the grouting pressure will affect the shape of settling tank on the surface.