埋地悬空管道弹塑性受力分析与计算  

Elastoplastic Analysis and Simulation of Buried and Suspended Pipeline

作　　者：吴彬[1,2] 刘晓宇 WU Bin;LIU Xiaoyu(Institute of Mechanics,China Academy of Sciences,Beijing 100190,China;School of Engineering Science,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院力学研究所流固耦合系统力学重点实验室,北京100190 [2]中国科学院大学工程科学学院,北京100049

出　　处：《三峡大学学报（自然科学版）》2020年第5期42-48,共7页Journal of China Three Gorges University：Natural Sciences

基　　金：国家重点研发计划(2016YFC0802103)。

摘　　要：埋地管道在各类地质灾害的作用下,可能导致管道下方土层塌陷或流失,使管道局部处于悬空状态,严重威胁管道的安全运行.首先,基于弹塑性地基梁理论,根据管道不同受力情况将管道划分为悬空段、塑性段和弹性段,分段建立管土相互作用下管道挠曲微分方程,并结合边界条件和连续条件给出悬空管道挠度和内力的求解方程;其次,采用遗传算法求解悬空管道挠度,以提高计算效率与计算精度;最后,忽略管道的轴向荷载,推导出悬空管道塑性区长度上限值.算例分析表明,与文献中的悬空管道力学模型相比,理论解与有限元数值模拟吻合最好,可用于工程设计与分析.Due to geological hazards,buried steel pipelines caused by the falling down or sweeping away of soil under it could be suspended,which has a significant effect on the safe operation of pipelines.Based on the theory of elastic-plastic foundation beam,the pipeline is firstly divided into three segments according to the different loading conditions,and the differential equations of pipeline deflection under the interaction of pipe and soil are established,respectively.The theoretical solutions of the deflection and internal force of suspended pipeline are derived by combining boundary conditions and continuous conditions.Secondly,the genetic algorithm is proposed to solve the suspended pipeline,so that calculation efficiency and accuracy could be significantly improved.Finally,the upper limit of plastic zone length of the suspended pipeline is given by neglecting the axial loads.The results show that compared with the existing mechanical models of suspended pipeline in the literature,the proposed theoretical solution is in good agreement with the numerical results,thus it can be used in engineering design and analysis.

关 键 词：悬空管道 管土相互作用 弹塑性地基梁模型 遗传算法 

分 类 号：TU311[建筑科学—结构工程]