论文部分内容阅读
作为一种保护邻近建筑物的措施,隔断墙已经开始在深基坑工程中应用,但目前对其有关参数的设计还缺乏理论指导。以某软土地区深大基坑实例为背景,利用有限元分析软件ABAQUS,建立三维有限元分析模型,土体采用修正剑桥模型,模拟开挖实际工况,深入分析了隔断墙各设计参数对保护基坑邻近建筑物效果的影响,邻近建筑物沉降计算值和实测值验证了隔断墙参数优化分析结果的合理性。研究结果表明:地表位移、建筑物的横向角变量和围护墙最大位移随着隔断墙深度的增加而逐渐减小,但建筑物横向角变量的减小幅度趋缓,隔断墙存在一合理深度;随着隔断墙的位置逐渐从基坑侧壁向邻近建筑物移动,隔断墙外侧地表横向和纵向沉降以及纵向不均匀沉降均减小,建筑物的横向角变量也明显减小。理论上,隔断墙越靠近邻近建筑物,保护建筑物的效果越好;隔断墙的平面设置范围对于邻近建筑的保护效果也有着明显的影响,一般情况下可以取邻近建筑物的范围作为隔墙的合理设置范围;隔断墙刚度对地表位移和建筑物角变量影响不大,实际工程中宜取中等刚度的隔断墙。
As a measure to protect neighboring buildings, the partition wall has started to be used in deep foundation pit engineering. However, the design of its relevant parameters is still lack of theoretical guidance. Taking the example of a deep foundation pit in a soft soil area as a background, the finite element analysis software ABAQUS was used to establish a three-dimensional finite element analysis model. The soil model was calibrated with a modified Cambridge model to simulate actual excavation conditions. The effect of protecting the adjacent structures of the foundation pit, the calculated settlement and the measured values of the adjacent buildings verify the rationality of the analysis results of the parameters of the partition wall. The results show that the displacement of the surface, the lateral angle of the building and the maximum displacement of the retaining wall decrease with the increase of the depth of the partition wall. However, the decrease of the lateral angle variable of the building slows down and the partition wall has a reasonable depth ; As the location of the partition wall gradually moves from the side wall of the foundation pit to the adjacent buildings, the horizontal and vertical settlement of the surface outside the partition wall and the uneven longitudinal settlement decrease, and the lateral angle variation of the buildings also decreases significantly. Theoretically, the closer the partition wall is to the adjacent buildings, the better the protection of the buildings. The range of the partition walls has a significant effect on the protection effect of the adjacent buildings. In general, the adjacent buildings can be taken as the partition wall Of the reasonable setting range; partition wall stiffness on the surface displacement and building angular variables have little effect on the actual project should take a moderate stiffness partition wall.