论文部分内容阅读
对某混凝土单支撑排桩支护深基坑开挖过程中围护桩的水平位移进行了实测,围护桩体现出内凸式的变形特征。由于水平支撑提供的支撑刚度不同,不同位置围护桩的水平位移有所差别。通过建立有限元模型对实际工程进行了数值模拟,结果表明,在内凸型模式下坑外地表沉降呈现凹槽形,沉降最大值位于距围护结构0.6倍开挖深度处;坑外深层土体的竖向变形可分为凹槽形沉降区、过渡区和隆起区,一倍开挖深度范围内为主要影响区域。分析表明,坑外深层土体的水平变形随着距围护结构距离的增加呈现出由内凸形向悬臂形演化的特征。
The horizontal displacement of the retaining pile during the excavation of a deep foundation pit supported by a single-supported concrete pylon was measured, and the retaining pile showed the convex deformation characteristics. Due to the different support stiffness provided by the horizontal support, the horizontal displacement of the retaining pile in different positions is different. The numerical simulation of the actual project by establishing the finite element model shows that the settlement of the surface of the pit presents a groove shape in the convex mode and the maximum settlement value is located at a depth of 0.6 times the excavation depth of the retaining structure. Vertical deformation of the body can be divided into groove-shaped settlement, transitional zone and uplift zone, double the depth of the excavation as the main impact area. The analysis shows that the horizontal deformation of deep soil outside the pit shows the evolution from the inner convex to the cantilever shape with the increase of the distance from the retaining structure.