基于管土耦合的埋地平行双钢管受力规律研究

Research on stress of buried parallel double steel pipes with consideration of coupling between pipe and soil

针对埋地平行双钢管在工业领域应用广泛,但其相互影响的研究极为缺乏的现状,建立了考虑管土相互作用的埋地单钢管有限元分析模型,并将模拟结果与试验、解析及既有的数值模拟结果进行对比验证.使用该建模方法建立了考虑管土耦合的埋地平行双钢管的有限元模型,探讨车辆荷载位置、钢管直径、埋管间距、水重和内压对钢管受力的影响.结果表明:当车辆荷载作用在两管之间时,双管各自承担的车辆荷载小于单管所承担的荷载;当车辆荷载作用在两管一侧时,钢管的受力情况与钢管直径相关,当钢管直径较大时,远离车辆荷载的管道为另一管道提供的支撑作用较小,双管平行埋设较单管更为不利,当钢管直径较小时则相反.水重及内压作用下的钢管力学行为受双管平行埋设的影响较小,当某一钢管受到内压作用时,可以为另一钢管提供更大的支撑作用,使得由水重和内压引起的钢管应力增量小于对应的单管.

In view of the current situation that buried parallel double steel pipes are used extensively in industry,but the study of their interaction is extremely limited,a finite element analysis model of buried single steel pipe considering the interaction between pipe and soil was established.The simulation results were compared with experimental,analytical and existing numerical simulation results for verification.Using this modeling method,the finite element models of buried parallel double steel pipes with consideration of pipe-soil coupling was established to explore the effects of vehicle load location,steel pipe diameter,buried pipe spacing,water weight and internal pressure on steel pipe stress condition.The results show that when the vehicle load is applied between the two pipes,the load shared by each pipe is smaller than that borne by a single pipe.When the vehicle load is applied to one side of the two pipes,the stress of the steel pipe is related to the diameter of the steel pipe.When the diameter is large,the pipe away from the vehicle load provides less support to the other pipe,the parallel buried two pipes is more unfavorable than the single pipe,and when the diameter of the steel pipe is small,the opposite is true.The mechanical behavior of the steel pipe under the water weight and internal pressure is less affected by the parallel buried double pipes.One steel pipe with internal pressure can provide greater support to the other steel pipe,inducing the incremental stress of the steel pipe caused by water weight and internal pressure is less than the corresponding single pipe.