基于注浆压力控制的混凝土顶管施工微扰动机理

Micro Disturbance Mechanism of Concrete Pipe-jacking with Slurry Pressure Control

为了研究顶管施工过程中注浆压力对控制土体变形的作用,建立有限元模型对注浆压力作用进行理论分析.通过对比实测数据与有限元结果,讨论了不同工况对孔隙水压力与土体变形的影响.分析了在不同注浆压力作用下,顶管周围土体的扰动情况,在此基础上提出了衡量土体受扰动程度的孔隙水压力变化率概念.结合土体变形状况与扰动分析结果,建议在实际工程中将注浆压力控制在管顶上覆土压力值的1.1倍,按此原则设定的注浆压力对周围环境影响较小,该研究结果可供今后类似顶管施工参考.

A finite element model for theoretical analysis was establish sure on soil deformation control during pipe-jacking construction. Base ta and finite element results, the influences of pore pressure and soil ed to study the effect of slurry pres- d on the comparison of measured da- deformation during the construction process were discussed. The soil disturbance around pipe-jacking with different slurry pressures was ana- lyzed, based on which the concept of pore pressure change rate was proposed. Taking the results of soil deformation and disturbance analysis into consideration, it is suggested that in practical engineering, the slurry pressure should be 1.1 times the overlying earth pressure, which has less impacts on the surround- ing environment. This conclusion can provide reference for future similar pipe-jacking constructions.