管道穿越对煤系土河床冲刷深度的影响

Influence of pipeline crossing on riverbed scouring depth of coal measure soil

为研究管道穿越煤系土河床后对冲刷深度的影响,基于室内构建的煤系黏土质和砂质河床模型试验装置,设置不同管道埋深、管径大小和冲刷流速进行冲刷模拟试验,并利用SPSS 25.0软件对河床冲刷深度与以上3个因素进行多元线性回归分析。结果表明:管道埋深、管径大小和冲刷流速3个因素能够解释冲刷深度71.4%~80.6%的变化,管道埋深显著负向影响冲刷深度,管径大小和冲刷流速显著正向影响冲刷深度。管道穿越会破坏河床颗粒间的原始胶结状态,强化水流的冲刷作用。利用所得线性回归方程对珠海市某管道穿越工程进行安全性验证,考虑了管道埋深与管径大小对冲刷深度的影响,验证结果证明了回归方程的可行性。研究成果为管道穿越工程设计提供一定参考。

For the purpose of studying the influence of pipeline crossing on the riverbed scouring depth of the coal meas-ure soil,different pipeline depths,pipe diameters and scouring velocity were set up to carry out scour simulation tests based on the clay and sandy riverbed model test equipment.The SPSS software was used to perform multiple linear re-gression analysis on the riverbed scouring depth and the above factors.The results show that the pipeline depth,pipe dia-meter and scouring velocity are responsible for 71.4%to 80.6%of the change of scour depth.The burial depth signific-antly and negatively affects the scouring depth;the pipe diameter and scouring velocity significantly and positively af-fect the scouring depth.Pipeline crossing will destroy the original cement state between the particles of the riverbed and strengthen the scouring effect of the water flow.With the influence of buried depth and pipe diameter on the scour depth being considered,the obtained linear regression equation was used to verify the safety of a pipeline crossing project in Zhuhai City,where the verification results have shown the feasibility of the regression equation.The research results can provide a certain reference for pipeline crossing engineering design.