综合管廊深基坑支护结构变形分析及优化研究  

Deformation analysis and optimization study of support structure of deep foundation pit of comprehensive pipe corridor

作　　者：卢兰萍[1] 安雪艳 LU Lanping;AN Xueyan(School of Civil Engineering,Hebei University of Engineering,Handan 056038,China)

机构地区：[1]河北工程大学土木工程学院,河北邯郸056038

出　　处：《甘肃科学学报》2024年第2期90-94,共5页Journal of Gansu Sciences

摘　　要：基于某综合管廊深基坑工程,运用Midas有限元软件,通过改变支护桩桩径、型钢布置形式、型钢尺寸、冠梁尺寸、内支撑间距的参数对支护桩水平位移变化规律进行了分析,并选取最优的支护方案。结果表明:通过增加桩径可有效抑制支护桩变形;型钢布置形式和型钢尺寸的改变对支护桩的影响较小;冠梁主要对支护结构的顶部变形起约束作用;内支撑水平向不等间距布置时增大了工作空间从而方便施工。最终方案为Φ850@600 SMW工法三轴水泥土搅拌桩,内插HN700×300×13×24型钢,型钢插一跳一布置;桩顶设置钢筋砼冠梁,内支撑为钢筋砼撑,支撑在冠梁上。模拟结果与实测结果基本一致,符合工程要求。Based on the deep foundation pit project of a comprehensive pipe corridor,Midas finite element software is used to analyze the horizontal displacement change law of the support pile by changing the parameters of pile diameter,section steel layout form,section size,crown beam size and internal support spacing,and the optimal supporting scheme is selected.The results showed that the deformation of retaining pile can be effectively restrained by increasing pile diameter.Steel decorate a form,and the influence of the change of the section size of supporting pile is small.Crown beam mainly plays a role of constraints on the top of the supporting structure deformation.The working space is increased when the internal support is arranged horizontally and unequally spaced,which is convenient for construction.The optimal solution isΦ850@600 SMW three-axis cement-soil mixing pile,inserted HN700×300×13×24 type steel,section steel inserted one jump one.The top of the pile is provided with a reinforced concrete crown beam,and the inner support is a reinforced concrete support,which is supported on the crown beam.The simulation results are basically consistent with the measured results and meet the requirements.

关 键 词：基坑支护 优化 数值模拟 支护桩变形 

分 类 号：TU473[建筑科学—结构工程]