翻车机房圆形基坑支护结构受力特性分析  

Characteristic analysis on retaining structure of cylindrical foundation pit of dumper shed

作　　者：何良德[1] 彭天驰 李元青[2] 王学新 

机构地区：[1]河海大学港口海岸与近海工程学院,南京210098 [2]中交水运规划设计院有限公司,北京100007 [3]天津市水利勘测设计院,天津300204

出　　处：《水道港口》2018年第1期89-95,共7页Journal of Waterway and Harbor

摘　　要：圆形支护结构由于拱效应,使得支护结构受力复杂。文章依托翻车机房工程实例,利用有限元软件ABAQUS建立空间轴对称计算模型,采用横环各向同性材料反映槽段接头对墙体环向刚度的折减影响,通过模拟基坑施工全过程,研究了支护结构位移和应力变化规律。通过计算墙体、内撑环向轴力以及入土段抗力的荷载分担比,研究环向刚度、内撑刚度、土层模量因素对结构位移、内力的影响。研究表明,墙体环向刚度对支护结构变形、内力有重要的影响,内撑刚度的影响主要集中在基坑深度范围内。在开挖面以上的外侧土压力呈直线分布,未见有"R"形分布规律;坑内土体对入土段嵌固作用明显大于外侧土体。The circular retaining structure bears complex force due to the soil arching effect. Based on the dumper shed project,the spatial axisymmetric modeling was established by using the finite element software ABAQUS. The modeling used transversely circumferential isotropic material on account of the effect of groove joint on the hoop stiffness reduction of the diaphragm wall. By simulating construction of foundation pit,displacement and stress regularity of the retaining structure were obtained. And the influence of the hoop stiffness,inner-support stiffness and soil modulus was considered by calculating the load share ratio of diaphragm wall,inner-support structure and interior soil. The result shows that hoop stiffness has important effect on displacement and stress,and the effect of inner-support stiffness is mainly on the depth range of foundation pit. Above the excavation surface,earth pressure behind the wall does not perform the ‘R'shaped distribution,just performs like a straight line. The embedded effect of interior soil is obviously larger than the soil behind the wall.

关 键 词：翻车机房 圆形支护结构 空间轴对称 横环各向同性材料 环向刚度折减系数 荷载分担比 

分 类 号：TV431[水利工程—水工结构工程]