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INVESTIGATION ON WAVE-INDUCED SEABED RESPONSE AROUND A BURIED PIPELINE CONSIDERING COUPLING EFFECT OF PORE PRESSURE ACCUMULATION AND STRESSES
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摘要: 波浪导致的海床液化是埋置管线失稳的一个重要因素。超静孔隙水压力累积引起的液化深度较深，对海底管线稳定性的影响较大，因此波浪作用下管线-海床系统的累积响应特征一直受到研究者的重点关注。本文基于考虑孔压累积与海床应力耦合发展的数值计算模型，对非线性行进波作用下含埋置管线的海床累积响应特征进行了模拟计算，并与非耦合模型的计算结果进行了对比分析，结果表明，当考虑孔压累积与海床应力的耦合效应时，管线附近累积孔压在水平方向上的不均匀分布会导致海床循环剪应力的增大，从而会极大地促进管线周围海床累积孔压的发展，增大管线的影响范围; 忽略孔压累积与海床应力的耦合效应，会在一定程度上低估管线周围海床的液化深度，不利于管线的安全。Abstract: The wave-induced seabed liquefaction is an important factor that causes instability of submarine pipelines buried in sediments. The accumulated excess pore water pressure may cause deeper soil liquefaction,which leads to severer influence on stability of pipelines. Therefore,many researchers pay their attention to the residual response of seabed-pipeline system under waves. This study uses the numerical model that considers the coupling effect of pore pressure accumulation and seabed stresses and simulates the seabed residual response with a buried pipeline under nonlinear progressive waves. The results are compared with those of the decoupled numerical model. The results have shown that for the case of considering the coupling effect of residual pore pressure and seabed stresses,the non-uniform distribution of residual pore pressure in the vicinity of the pipeline can cause an increase of the cyclic shear stress,which can significantly accelerate the development of residual pore pressure in the associated area and enlarge the influenced range of the pipeline. Neglecting the coupling effect of residual pore pressure and seabed stresses can underestimate the depth of liquefaction around the buried pipeline to some extent,which is conductive to the safety of pipelines.
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Key words:
- Waves /
- Buried pipeline /
- Residual pore pressure /
- Liquefaction /
- Coupling effect
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图 1 波浪作用下含埋置管线海床计算示意图
Figure 1. Sketch of the wave-induced seabed response around a buried pipeline
图 3 波浪作用下埋置管线周围孔压对比图
Figure 3. Comparison of wave-induced pore pressure around a buried pipeline
图 6 不同位置处累积孔压随时间变化对比图
Figure 6. Comparison of development of residual pore pressures at different locations
图 7 管线附近海床的累积孔压水平分布图
Figure 7. Lateral distribution of residual pore pressure in the vicinity of the pipeline
图 8 管线中心竖向截面与海床远端竖向截面的累积孔压分布对比图
Figure 8. Comparison of residual pore pressures along the vertical section across the central of the pipeline and that in the far field
图 9 累积孔压沿管土交界面分布对比图
Figure 9. Comparison of residual pore pressures along the interface of pipeline and soils
图 11 远点处海床平均有效正应力差值
Figure 11. Difference of the mean effective stress in the far field
图 12 管线埋深2m时海床的液化区分布图
Figure 12. Liquefaction zone of the seabed around the pipeline at a buried depth of 2m
图 13 管线埋深为3m时海床的液化区分布图
Figure 13. Liquefaction zone of the seabed around the pipeline at a buried depth of 3m
表 1 试验参数
Table 1. Parameters of the flume test
变量名称与单位 数值 海床参数 厚度h/m 0.826 饱和度Sr 0.95 孔隙率n 0.42 泊松比μ 0.33 渗透系数k/m·s-1 1.1×10-3 相对密度Dr 0.5 剪切模量G/N·m-2 6.4×105 密度ρs/kg·m-3 1700 管线参数 埋深e/m 0.167 管线外半径R1/m 0.094 管线内半径R2/m 0.084 泊松比μp 0.32 剪切模量Gp/N·m-2 8×1010 密度ρp/kg·m-3 2700 
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表 2 数值模型计算参数
Table 2. Parameters of the numerical model
变量名称与单位 数值 波浪参数 波高H/m 3.8 周期T/s 10 水深d/m 15 波长L/m 108.9 海床参数 厚度h/m 40 长度L/m 108.9 饱和度Sr 1 孔隙率n 0.42 泊松比μ 0.33 渗透系数k/m·s-1 5×10-5 相对密度Dr 0.33 剪切模量G/N·m-2 8×106 密度ρs/kg·m-3 1973 管线参数 埋深e/m 2 管径D/m 1.2 泊松比μp 0.32 剪切模量Gp/N·m-2 8×1010 密度ρp/kg·m-3 2300
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