岩土力学 ›› 2021, Vol. 42 ›› Issue (9): 2355-2374.doi: 10.16285/j.rsm.2021.0295

• 基础理论与实验研究 • 上一篇    下一篇

基于非线性Pasternak地基模型的海床悬链线立管触地段初始侵彻静平衡解析解

张治国1, 2, 3, 4, 5，沈安鑫1，张成平4，PAN Y. T.5，吴钟腾2   

  1. 1. 上海理工大学 环境与建筑学院，上海 200093；2. 自然资源部丘陵山地地质灾害防治重点实验室 福建省地质灾害重点实验室，福建 福州 350002；3. 国家海洋局北海预报中心 山东省海洋生态环境与防灾减灾重点实验室，山东 青岛 266061；4. 北京交通大学 城市地下工程教育部重点实验室，北京 100044；5. 新加坡国立大学 土木与环境工程系，新加坡
  • 收稿日期:2021-03-01 修回日期:2021-04-12 出版日期:2021-09-10 发布日期:2021-08-26
  • 作者简介:张治国，男，1978年生，博士，博士后，副教授，主要从事地下工程，海洋地质工程等方面的研究工作。
  • 基金资助:
    国家自然科学基金资助项目（No.41772331，No.41977247）；自然资源部丘陵山地地质灾害防治重点实验室（福建省地质灾害重点实验室）开放课题（No.FJKLGH2020K004）；山东省海洋生态环境与防灾减灾重点实验室开放课题（No.201703）。

Analytical solution to initial intrusion static equilibrium of steel catenary riser in touchdown zone on seabed based on nonlinear Pasternak foundation model

ZHANG Zhi-guo1, 2, 3, 4, 5, SHEN An-xin1, ZHANG Cheng-ping4, PAN Y. T.5, WU Zhong-ten2   

  1. 1. School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China; 2. Fujian Key Laboratory of Geohazard Prevention, Key Laboratory of Geohazard Prevention of Hilly Mountains, Ministry of Natural Resources, Fuzhou, Fujian 350002, China; 3. Shandong Provincial Key Laboratory of Marine Ecological Environment and Disaster Prevention and Mitigation, North Sea Marine Forecast Center of State Oceanic Administration, Qingdao, Shandong 266061, China; 4. Key Laboratory of Urban Underground Engineering of Ministry of Education, Beijing Jiaotong University, Beijing 100044, China; 5. Department of Civil and Environmental Engineering, National University of Singapore, Singapore
  • Received:2021-03-01 Revised:2021-04-12 Online:2021-09-10 Published:2021-08-26
  • Supported by:
    This work was supported by the National Natural Science Foundation of China(41772331, 41977247), the Opening Fund of Key Laboratory of Geohazard Prevention of Hilly Mountains, Ministry of Natural Resources(Fujian Key Laboratory of Geohazard Prevention)(FJKLGH2020K004) and the Opening Fund of Shandong Provincial Key Laboratory of Marine Ecological Environment and Disaster Prevention and Mitigation(201703).

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摘要： 钢质悬链线立管(steel catenary riser，简称SCR)作为深海油气资源开采的首选立管系统，其在与海床土体的相互作用下，对触地段管线埋深以及疲劳寿命影响较大。依据管土相互作用的非线性土体阻力?侵彻深度(p-y)曲线，将其简化为三段线弹性土体刚度衰减模型，求得了基于非线性Pasternak地基模型的海床上悬链线立管触地段初始侵彻静平衡解析解。通过与三维有限元算例和5个模型试验算例的对比分析，发现常规Winkler地基模型会高估管线竖向变形与弯矩，验证了基于非线性Pasternak地基模型解析解的合理性与适用性；海床抗剪强度Su0的增加显著提高了三段线弹性土体刚度，降低了管线竖向变形。此外，针对水深H、立管铺设角度?、管线外径D、管线弹性模量E和材料密度??的变化对管线侵彻土体时的物理力学特性进行了参数对比以及安全评估分析。结果表明：立管铺设角度??增大会使管线竖向变形减小，弯矩与剪力则有所增大，角度超过82o易出现屈服破坏；管线外径D的增加会使土体竖向阻力、管线竖向变形与触地段管线弯矩、剪力同步增大，外径超过0.4 m易出现屈服破坏；管线弹性模量E越大，竖向变形越小，弯矩与剪力则有所增大，弹性模量超过275 GPa易出现屈服破坏；管线材料密度越大，管线竖向变形越大，弯矩没有明显变化，剪力则有所增大，密度超过14 850 kg/m3易出现屈服破坏。上述结论可以为海洋管线悬链线立管的前期设计提供一定理论依据。

关键词: 钢质悬链线立管, 管土作用, p-y曲线, 非线性Pasternak地基模型, 安全评估

Abstract: As the preferred riser system for deep-sea oil and gas resource extraction, steel catenary riser (SCR) has a large impact on the depth of burial and fatigue life of the pipeline in the touchdown zone due to its interaction with the seabed soil body. According to the nonlinear soil resistance-intrusion depth p-y curve of pipe soil interaction, it is simplified as a three segment linear elastic soil stiffness attenuation model, and the analytical solution of initial penetration static equilibrium of catenary riser on seabed is obtained based on the nonlinear Pasternak foundation model. Compared with three-dimensional finite element and five model test cases, it is found that conventional Winkler foundation model overestimates the pipeline vertical deformation and bending moment of soil, which verifies the rationality and applicability of the analytical solution based on nonlinear Pasternak foundation model; the increase of seabed shear strength Su0 significantly improves the stiffness of three-stage linear elastic soil and reduces the pipeline vertical deformation. In addition, according to the changes of water depth H, riser laying angle ?, pipeline outer diameter D, pipeline elastic modulus E and material density ?, the physical and mechanical properties of pipeline penetrating soil are compared and analyzed. The results show that with the increase of vertical pipe laying angle ?, the pipeline vertical deformation will be reduced, while the bending moment and shear force will be increased. When the angle exceeds 82o, it is prone to yield failure. With the increase of pipe outer diameter D, the soil vertical resistance, vertical deformation, bending moment and shear force in touchdown zone will be increased simultaneously. When the outer diameter exceeds 0.4 m, it is easy to yield. The larger the elastic modulus E is, the smaller the pipeline vertical deformation is, the greater the bending moment and shear force are, when the elastic modulus exceeds 275 GPa, it is easy to yield. When the density of pipeline material is higher, the pipeline vertical deformation is larger, the bending moment does not change obviously, but the shear force increases, and when the density exceeds 14 850 kg/m3, it is easy to yield. The above conclusions can provide a theoretical basis for the preliminary design of catenary riser of offshore pipeline.

Key words: steel catenary riser (SCR), interaction of pipes and soil, p-y curve, nonlinear Pasternak model, safety assessment

中图分类号: 

  • TU443
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