冀东油田滩海仿生草冲淤作用模型试验研究

Model Tests on Scour and Deposition Actions of Artificial Grass for Jidong Oilfield Beach

结合冀东油田海底管道仿生草防冲刷试验工程,采用1:10比尺进行水槽断面物理模型试验,研究水流作用下冀东油田滩海区域仿生草的缓流效果和仿生草周边泥沙冲淤变化规律。试验结果表明,水流作用下仿生草倒伏后起到屏蔽作用,使草段内流速大幅减小,草段上部流速增大。当水流流速较小,草段内速度较小,难以发生淤积;当水流流速较大,海床发生普遍冲刷时,草段内海床冲刷程度也远小于草段外海床。

Based on the trial project of artificial grass anti-scouring action for seabed pipeline in Jidong Oilfield, the physical model tests with a scale of 1：10 are performed in a water flume. The flow-mitigating effect of the ar- tificial grass under flows and the scour and deposition rules of the sand around the artificial grass are investi- gated. The test results show that under the flows, the shelter function after the lodging of the artificial grass leads to the great mitigation of the flow velocity in the grass, and also makes the flow velocity above the grass increase simultaneously. Under low velocity of the flows, the flow velocity in the grass is small and deposition is not easily induced. Under large velocity of the flows, when scour generally occurs in the seabed, the scour in the artificial grass is fairly smaller than that outer the grass.