【摘要】 建立三维有限元模型对天津站交通枢纽工程采用逆作法的深基坑进行分析,将计算结果与实测值进行比较,结果表明:宏观上采用平面应变原理,微观上采用三维模型的数值分析方法可以较好模拟基坑施工过程中的受力与变形性能;在负三层开挖产生的地下连续墙位移虽然不大,属于地下连续墙可正常工作范围,但在地下连续墙中产生较大的弯矩;在负三层设置临时支撑,对于减小地下连续墙的弯矩、减少配筋是很有益的。更多还原

【Abstract】 Based on the top-down method,3D FEM was used to analyze the deep foundation pit of Tianjin Station transportation hub engineering.The calculated results were compared with the measured data.It was shown that the numerical analysis method using plane-strain theory in macroscopic view and 3D simulation in microscopic scales could give good prediction of stress and deformation of the diaphragm walls.The displacement of the diaphragm walls was small enough to meet the normal working condition,but the bending moment was relatively great in the excavation of the negative third layer. The temporary supporting in the negative third layer was useful to increase the bending moment and reinforcement.更多还原