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中南大学学报(自然科学版)

Journal of Central South University

第51卷    第5期    总第309期    2020年5月

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文章编号:1672-7207(2020)05-1328-09
基于Pasternak双参数模型的滑坡段埋地管道受力分析方法
张家铭,尚玉杰,王荣有,王殿龙

(中国地质大学(武汉) 工程学院,湖北 武汉,430074)

摘 要: 为改进基于Winkler模型的弹性地基梁法固有缺陷,提高计算精度,引入Pasternak双参数模型,考虑土弹簧间相互作用,提出一种考虑轴向载荷的滑坡段埋地管道受力分析方法,通过参数分析讨论轴向载荷、地基反力系数及地基剪切刚度对滑坡段管道受力变形性状的影响。研究结果表明:基于Pasternak双参数模型的滑坡段管道受力变形分析方法比基于Winkler模型的弹性地基梁法具有更高的精度,更符合工程应用;轴向载荷对滑坡段管道受力变形影响显著,在管道强度设计和校核中不能忽略;地基反力系数较大时,荷载对临近单元体的传力性减弱,管道受力变形性状主要受地基反力系数影响;地基剪切刚度较大时,荷载对临近单元体的传力作用较强,减弱土体对管道的约束作用,影响管道受力变形性状。

 

关键字: Pasternak双参数模型;参数分析;轴向载荷;地基反力系数;地基剪切刚度

Force analysis method of buried pipeline in landslide section based on Pasternak double-parameter model
ZHANG Jiaming, SHANG Yujie, WANG Rongyou, WANG Dianlong

Faculty of Engineering, China University of Geosciences, Wuhan 430074, China

Abstract:In order to improve the inherent defects and improve the calculation accuracy of elastic foundation beam method based on Winkler model, a force analysis method based on Pasternak double-parameter model was introduced. Considering the shear action between soil spring, an analysis method of buried pipeline in landslide section which considers axial load was presented. The effects of axial load, foundation reaction coefficient and foundation shear stiffness on the deformation behavior of pipelines, caused by force, in landslide section were discussed through parameter analysis. The results show that the force analysis of buried pipeline in landslide based on Pasternak double-parameter model is more accurate and suitable than the elastic foundation beam method based on Winkler model. The effect of axial load on the deformation of pipeline which is aroused by force in landslide section is significant. It can not be neglected during the verification and design of buried pipeline in landslide section. When the coefficient of subgrade reaction is greater, the deformation behavior of the pipeline is mainly affected by the coefficient of subgrade reaction because force transmission of the load to the adjacent element is weakened. When the shear stiffness of foundation is greater, force transmission of the load to the adjacent unit body is strengthened, which affects the deformation behavior of the pipeline.

 

Key words: Pasternak double-parameter model; parametric analysis; axial load; coefficient of subgrade reaction; shear stiffness of foundation

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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