钢带增强螺旋波纹管抗变形能力三维仿真分析

发布时间：2019-01-09 14:28

【摘要】：为了研究钢带增强螺旋波纹管在吹砂填海等不均匀沉降地区的承载能力及协调变形能力,采用Ansys建立三维有限元模型,在不同埋深、不同管周土支撑刚度、不均匀变形条件、自由敷设等工况下对1.5 m管径进行数值仿真模拟。结果表明,该管在上述工况下有较好的承载及变形协调能力,主要表现在:(1)钢带承担了大部份的荷载,环向抗变形能力强;(2)在不考虑土拱效应、管土分担作用、波纹管的结构特性时1.5 m高环刚度管最大覆土可达12 m;(3)管周土支撑刚度对管道的钢带及聚乙烯内皮的应力及变形有着明显的影响,变形值对支撑刚度系数及上覆荷载影响的敏感性比应力值大;(4)管材对不均匀沉降有较好的纵向协调变形能力;(5)自由敷设有一定的弯曲变形能力,但不满足《埋地塑料排水管道施工》中弧形敷设20de的要求。
[Abstract]:In order to study the bearing capacity and coordinated deformation capacity of steel strip reinforced spiral bellows in non-uniform settlement areas such as sand blowing and reclamation, a three-dimensional finite element model was established by using Ansys, and the supporting stiffness and deformation conditions of different buried depth, different soil around the pipe and non-uniform deformation conditions were established. Numerical simulation of 1.5 m pipe diameter was carried out under the condition of free laying. The results show that the pipe has better load-bearing and deformation coordination ability under the above working conditions, mainly as follows: (1) the steel strip bears most of the load and has strong anti-deformation ability in the circumferential direction; (2) under the condition that the soil arch effect is not taken into account and the pipe and soil share the structural characteristics of the bellows, the maximum soil cover of 1.5 m high ring rigid pipe can reach 12 m; (3) the soil bracing stiffness around the pipe has obvious influence on the stress and deformation of steel strip and polyethylene endothelium, and the sensitivity of deformation value to the stiffness coefficient and overburden load is greater than the stress value. (4) the pipe has better longitudinal and coordinated deformation ability to the uneven settlement, (5) the free laying has the certain bending deformation ability, but does not meet the requirements of "buried plastic drainage pipe construction" in the arc laying 20de.
【作者单位】：重庆交通大学土木工程学院;广西交通科学研究院;
【分类号】：TU992.23;U417.3

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