伍鹤皋¹，于金弘¹，石长征¹，石雅竹¹，董旭荣²
AuthorsHTML:伍鹤皋¹，于金弘¹，石长征¹，石雅竹¹，董旭荣²
AuthorsListE:Wu Hegao¹，Yu Jinhong¹，Shi Changzheng¹，Shi Yazhu¹，Dong Xurong²
AuthorsHTMLE:Wu Hegao¹，Yu Jinhong¹，Shi Changzheng¹，Shi Yazhu¹，Dong Xurong²
Unit:1. 武汉大学水资源与水电工程科学国家重点实验室，武汉 430072；
2. 陕西省水利电力勘测设计研究院，西安 710001
Unit_EngLish:1. State Key Laboratory of Water Resources and Hydropower Engineering Science，Wuhan University，Wuhan 430072，China；
2. Shaanxi Province Institute of Water Resources and Electric Power Investigation and Design，Xi’an 710001，China
Abstract_Chinese:目前国内水利水电行业回填钢管的设计主要参考给排水行业规范，但其管径远超出给排水管道，研究大直径回填钢管管土相互作用，完善回填钢管结构设计理论，是当前亟待解决的重要课题．本文建立大直径回填钢管有限元计算模型，假定土体遵守Drucker-Prager屈服准则，钢管与土体交界面采用面-面接触单元，分析了管空、充水和满水工况下管土接触状态、钢管变形、土体位移和管周土压力，并探讨了管径和管土间摩擦系数对管土相互作用的影响．结果表明：管土接触状态在管顶、管腰和管底通常处于黏合状态，胸腔和腋部区域易发生滑动；钢管竖向和水平变形量并不完全相同，充水工况对钢管变形最为不利，满水工况较为有利；管顶土体位移受钢管变形的影响呈“U”形分布，即中间大、两侧小；管周土压力分布在管空和充水工况下较为相似，满水工况下会发生较大变化，土压力在土层交界附近会出现突变现象，其分布形式与Spangler模型存在较大区别；管径增大后，管内水体重力对钢管受力和变形更为不利，故大直径回填钢管设计时应考虑充水工况下的钢管变形；管径越大，管顶土压力平均值越接近棱柱荷载，钢管胸腔到顶部之间土体对管顶土压力影响越显著；管土间摩擦系数对管土相互作用影响较小，非关键因素．
Abstract_English:At present，the design of buried steel pipe in the domestic water conservancy and hydropower industry is mainly based on the specifications of the water supply and drainage industry. However，the pipe diameter of buried steel pipe is greater than that of water supply and drainage pipe. Therefore，analyzing the pipe-soil interaction of large-diameter buried steel pipe and improving the design theory are important tasks. This study establishes a finite element calculation model for large-diameter buried steel pipe. In the finite element calculation model，the soil is assumed to follow the Drucker-Prager yield criterion，and the surface-surface contact element is adopted at the pipe-soil interface. The contact state of the pipe-soil interaction，pipe deformation，soil displacement，and soil pressure around the pipe are analyzed under the empty pipe，water filling，and full water conditions. Meanwhile，the influences of the pipe diameter and friction coefficient of the pipe-soil interface are studied. Results show that the contact state of the pipe-soil interaction is usually sticking at the top，spring line，and bottom regions of the pipe. Meanwhile，the pleura and haunch regions are prone to slide. The vertical and horizontal deformations of the pipe are not precisely the same. Moreover，the water filling condition is most unfavorable for pipe deformation，whereas the full water condition is favorable for pipe deformation. Meanwhile，owing to pipe deformation，the displacement of the soil at the top of the pipe is “U” shaped，that is，the middle is large，and the sides are small. The soil pressure distribution around the pipe is similar under the empty pipe and water filling conditions but changes significantly under the full water condition. Furthermore，the soil pressure abruptly changes near the boundary of the soil layers，and the soil pressure distribution is different from the Spangler model. As the pipe diameter increases，the water weight in the pipe is unfavorable to the force and deformation of pipe. Therefore，in the design of the large-diameter buried steel pipe，the pipe deformation in the water filling condition should be considered. Moreover，the larger the pipe diameter is，the closer the average value of the soil pressure at the top of the pipe to the prism load and the more significant the influence of the soil between pleura and top regions on the soil pressure. The friction coefficient of pipe-soil interface has only a slight influence on the pipe-soil interaction；thus，it is not a key factor.
Keyword_Chinese:回填钢管；管土相互作用；土压力；环变形；摩擦系数
Keywords_English:buried steel pipe；pipe-soil interaction；soil pressure；ring deformation；friction coefficient

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