粒子法和离散元法在管土耦合分析中的应用

徐涛龙; 邵常宁; 兰旭彬; 丁鸿超

doi:10.6052/j.issn.1000-4750.2021.06.S048

粒子法和离散元法在管土耦合分析中的应用

doi: 10.6052/j.issn.1000-4750.2021.06.S048

1.
西南石油大学石油与天然气工程学院，四川，成都 610500
2.
中石化石油工程设计有限公司成都分公司，四川，成都 610031

基金项目: 国家科技支撑计划项目(2011BAK06B01-11)；油气消防四川省重点实验室开放基金项目(YQXF201601)；西南石油大学石油管材服役安全青年科技创新团队项目(2018CXTD01)

详细信息

作者简介:
邵常宁(1996−)，男，山东人，硕士生，从事油气管道第三方损伤分析及管道风险评价等研究(E-mail: schangning@qq.com)

兰旭彬(1994−)，男，黑龙江人，硕士生，从事油气管道地质灾害损伤分析及管道风险评价等研究(E-mail: 2267266634@qq.com)

丁鸿超(1997−)，男，甘肃人，硕士生，从事油气管道地质灾害损伤分析及管道风险评价等研究(E-mail: 1010365014@qq.com)

通讯作者:
徐涛龙(1984−)，男，浙江人，讲师，博士，从事管线力学及完整性管理等研究(E-mail: swpuxtl@swpu.edu.cn)

中图分类号: TU43
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- 文章访问数: 54
- HTML全文浏览量: 13
- PDF下载量: 25
- 被引次数: 0
出版历程
- 收稿日期: 2021-06-07
- 修回日期: 2022-03-10
- 网络出版日期: 2022-04-06
- 刊出日期: 2022-06-06

APPLICATION OF PARTICLE METHOD AND DISCRETE ELEMENT METHOD IN PIPE-SOIL COUPLING ANALYSIS

1.
School of Petroleum Engineering, Southwest Petroleum University, Sichuan, Chengdu 610500, China
2.
Chengdu Branch of Sinopec Petroleum Engineering Design Co., Ltd y, Sichuan, Chengdu 610031, China

摘要

摘要: 为克服管土耦合分析中土体分层、压缩、运移、流变等大变形问题，传统有限元分析技术需借助新的土体模拟及耦合方法。其中，基于纯拉格朗日的粒子法(PM)和细观离散单元理论的离散元法(DEM)，因其在土体大变形领域的独特优势而得到广泛关注。针对管道沿线最常见的地质灾害和第三方扰动行为，利用光滑粒子流体动力学(SPH)分析土质滑坡大变形、黏性泥石流冲刷下管道的受力变形特征，获取管道受土中近场爆炸冲击下的动态响应规律，精确模拟了爆炸土中成腔、土体层裂、压缩等现象，联合离散元法中的颗粒流软件(PFC)与三维有限差分程序(FLAC 3D)再现挖机多铲掘进下土体的运移过程，得到管体的载荷累积效应。多次实践表明：以SPH为代表的粒子法和以PFC为代表的离散元法均能较好解决管土耦合分析中土体的非线性大变形问题，引入流体动力学手段，达到了土体变形研究方法多元化的目的，为进一步研究土中多物理场耦合响应机理奠定了基础。
- 管土耦合分析 /
- 光滑粒子流体动力学方法 /
- 粒子流-三维有限差分耦合 /
- 土质滑坡 /
- 泥石流 /
- 爆炸冲击 /
- 机械挖掘
Abstract: In order to overcome the problems of soil stratification, compression, migration, rheology and other large deformation in pipe soil coupling analysis, the traditional finite element analysis technology needs the help of new soil simulation and coupling methods. Among them, particle method (PM) based on pure Lagrangian and, discrete element method (DEM) based on meso discrete element theory are widely adopted because of their unique advantages in the field of large deformation of soil. Aiming at the most common geological disasters and the third-party disturbance along the pipeline, smoothed particle hydrodynamics (SPH) was used to analyze the stress and deformation characteristics of the pipeline under the large deformation of soil landslide and the erosion of viscous debris flow. The dynamic response rules of the pipeline under the impact of near-field explosion in soil were obtained. The cavitation, soil spalling, compression and other phenomena in explosive soil were accurately simulated, the particle flow software (PFC) and the three-dimensional finite difference program (FLAC 3D) of the discrete element method are combined to reproduce the soil movement process under a multi-shovel excavation, and the load accumulation effect of the pipe body is obtained. Many practices show that the particle method represented by SPH and the discrete element method represented by PFC can better solve the nonlinear large deformation problem of soil in the pipe soil coupling analysis. The fluid dynamics method is introduced to achieve the purpose of diversification of soil deformation research methods, which lays a foundation for further research on the coupling response mechanism of multi physical fields in soil.
- pipe-soil coupling analysis /
- SPH /
- PFC-FLAC 3D coupling /
- soil landslide /
- debris flow /
- explosion shock /
- mechanical excavation

HTML全文

图 1 SPH-FEM模拟结果与全尺寸试验结果对比

Figure 1. Comparison between SPH-FEM simulation results and full-scale test results

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2 滑坡演变中滑体及管道位移云图

2. Nephogram of landslide mass and pipeline displacement in landslide evolution

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图 3 滑坡演变过程中管道迎滑面等效应力曲线

Figure 3. Equivalent stress curve of pipeline upstream sliding surface during landslide evolution

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图 4 滑坡演变过程中管道背滑面等效应力曲线

Figure 4. Equivalent stress curve of pipeline downstream sliding surface during landslide evolution

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图 5 滑坡演变过程中管道轴向应力云图

Figure 5. Nephogram of pipeline axial stress during landslide evolution

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图 6 泥石流冲击管道过程

Figure 6. Process of debris flow impacting pipeline

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图 7 泥石流下管道的应力时程

Figure 7. Stress time history of pipeline under debris flow

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图 8 试验与模拟结果不同时刻土壤鼓包形态对比图

Figure 8. Comparison of soil bulge morphology at different times of test and simulation results

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图 9 试验与模拟结果不同时刻的对比

Figure 9. Comparison of test and simulation results at different times

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图 10 爆腔形态模拟结果与理论尺寸对比

Figure 10. Comparison between simulation results of blasting cavity shape and theoretical size

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图 11 不同土壤中管道最大等效应力云图

Figure 11. Cloud diagram of maximum equivalent stress of pipeline in different soils

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图 12 不同土壤内的爆腔形态(计算时刻：50 ms)

Figure 12. Explosion cavity shape in different soils (calculation time: 50 ms)

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图 13 基于PFC-FLAC 3D的铲斗-土体-管道耦合模型

Figure 13. Bucket-soil-pipe coupling model based on PFC-FLAC 3D

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图 14 铲斗-土体-管道耦合模型的动态挖掘过程

Figure 14. Dynamic excavation process of bucket-soil-pipe coupling model

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图 15 多铲挖掘过程中各铲挖掘力及管道振动情况

Figure 15. Excavation force and pipeline vibration of each shovel during multi shovel excavation

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图 16 不同挖掘时刻各铲作用下管道应力分布

Figure 16. Stress distribution of pipeline under the action of shovel at different excavation times

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