水力管线渗漏侵蚀对隧道沉降的影响  

Influence of leakage erosion of hydraulic pipelines on tunnel settlement

作　　者：苏红孟 秦兵 苏静 SU Hongmeng;QIN Bing;SU Jing(Jinan Huanghe Road and Bridge Construction Group Co.,Ltd.,Jinan 250000,China;Jinan Urban Construction Group Co.,Ltd.,Jinan 250031,China;Department of Civil Engineering,Shandong Jianzhu University,Jinan 250101,China)

机构地区：[1]济南黄河路桥建设集团有限公司,济南250000 [2]济南城建集团有限公司,济南250031 [3]山东建筑大学土木工程学院,济南250101

出　　处：《计算机辅助工程》2024年第2期38-43,共6页Computer Aided Engineering

摘　　要：为研究管线渗漏侵蚀对隧道沉降的影响,在流-固耦合的基础上用PFC2D模拟管线和隧道,用PFC中的测量圆监测不同颗粒骨架下土体渗透系数、孔隙率变化以及隧道周围土体中的孔隙水压力分布,并以此推断出应力集中位置,从而模拟隧道沉降情况。结果表明:在管线渗漏侵蚀下,可将隧道所受水的浮力、周围土的压力、水流动时的推力看作是一个剪切合力,其易对隧道的外部结构产生破坏;在土体颗粒级配相同、流体压力梯度不同时,隧道的沉降量与压力梯度呈正相关;试验中的模型相似比与应力相似比可有效减小室内试验的边界效应带来的误差。In order to study the influence of pipeline leakage erosion on tunnel settlenment,based on the principle of fluid-structure coupling,PFC2D is used to simulate the pipeline and tunnel.The measuring circle in PFC is used to monitor the changes of soil permeability and porosity under different particle skeletons and the pore water pressure distribution in the soil around the tunnel.From this,the location of the stress concentration is inferred.The tunnel settlement simulation is completed.The results show that under the action of pipeline leakage and erosion,the buoyancy of the water in the tunnel,the pressure of the surrounding soil,and the thrust of the water flow can be regarded as a shear resultant force,which is easy to damage the external structure of the tunnel.When the soil particle gradation is the same and the pressure gradient of the fluid is different,the settlement amount of the tunnel is positively correlated with the pressure gradient.The model similarity ratio and stress similarity ratio in the test can effectively reduce the error caused by the boundary effect of the indoor test.

关 键 词：流-固耦合 管线渗漏 隧道 沉降 压力梯度 相似比 

分 类 号：TU432[建筑科学—岩土工程] TU990.3[建筑科学—土工工程]