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以西江引水顶管工程为背景,借助有限元软件对其施工过程进行了三维数值模拟,探讨了顶管施工过程中工作井与土体受力变形特性及稳定性,工作井模拟中考虑钢筋与否的影响,千斤顶压力对井和土层受力变形的影响。研究表明:井后土层最大应力出现在垫板后,竖向位移呈现类似Peck沉降槽;土层水平位移在竖向近似线性分布,横向在1.5倍垫板宽度范围内迅速衰减,该范围外衰减值显著减小;工作井、钢筋最大应力均出现在井与管的连接处,工作井局部开裂,但处于安全状态;土压力理论计算被动土压力与数值计算反力比值满足稳定标准,土体处于稳定状态;数值计算中考虑钢筋与否对土层结构受力变形影响甚微;土层、工作井受力和稳定性均与千斤顶压力近似呈线性关系。
Taking the Xijiang River Diversion Project as the background, the three-dimensional numerical simulation of the construction process was carried out by means of finite element software. The deformation and stability of working wells and soil mass during the pipe jacking were discussed. No impact of jack pressure on well and soil stress deformation. The results show that the maximum vertical displacement of the soil after the well is similar to that of the Peck settler in the vertical displacement. The horizontal displacement of the soil is approximately linear in the vertical direction and rapidly decreases in the transverse direction within 1.5 times of the width of the backing plate. And the maximum value of the working well and the steel bar appear at the junction of the well and the pipe. The working well is partially cracked but in a safe state. The earth pressure theory calculates that the passive earth pressure and the numerical reaction force ratio meet the stability standard. The soil The body is in a steady state. Considering whether reinforcement or not in the numerical calculation has little effect on the deformation and deformation of the soil structure, the stress and stability of the soil and working well are approximately linear with the jacking pressure.