水力管线渗漏侵蚀对隧道沉降的影响

打开文本图片集

中图分类号：TU432；TU990.3 文献标志码：B

Influence of leakage erosion of hydraulic pipelines on tunnel settlement

SU Hongmeng' ，QIN Bing2，SU Jing （1.Jinan Huanghe Road and Bridge Construction Group Co.，Ltd.，Jinan 25OoOo，China； 2.Jinan Urban Construction Group Co.，Ltd.，Jinan 25OO31，China； 3．Department of Civil Engineering，Shandong Jianzhu University，Jinan 25O1O1，China）

Abstract： In order to study the influence of pipeline leakage erosion on tunnel setlenment，based on the principle of fluid-structure coupling，PFC2D is used to simulate the pipeline and tunnel. The measuring circlein 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 underthe 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 stresssimilarity ratio in the test can effectively reduce the error caused by the boundary effect of the indoor test.

Key Words： fluid-structure coupling； pipeline leakage； tunnel； sedimentation； pressure gradient；similarity ratio

0引言

城市地下空间的开发利用随着时代发展而逐渐普及，我国许多城市都已经修建城市快速轨道交通（rapid transit series，RTS）[1-2]。（剩余6046字）