【作者】 王飞；

【导师】 王建华；

【作者基本信息】 天津大学 ， 岩土工程， 2014， 硕士

【摘要】 在温度应力作用下，管将纵向伸长，管伸长过程中将受到地基土的轴向约束力作用，当轴向约束力达到某一极限值时，管将发生侧向屈曲。管的纵向移动和侧向屈曲将使管线无法正常工作，因此研究管土纵向相互作用的摩擦特性具有重大意义。本文首先设计了适用于模型试验的试验箱，并利用真空堆载预压法制备了模型试验所需的试验土层。在土层制备过程中，改进并探索了改善土层均匀性的方法。其次通过模型试验，获得了管所受轴向摩阻力与管轴向位移之间的关系曲线。通过分析管土纵向相互作用的荷载位移曲线，研究了加荷速率、土层强度和土层上覆有效压力对管土纵向相互作用摩擦特性的影响。最后利用接触面剪切试验所得管表面材料与土之间和土层内部的相关参数，利用“α”法、“β”法和有限元分析对模型试验结果进了预测，比较并分析了预测值和试验值，并给出了造成试验误差的可能性原因。更多还原

【Abstract】 Pipelines experience thermal stresses and hence resulting in expansion andextension. The foundation soil constrains the axial deformation of the pipeline whichmakes the pipeline under subsidiary stress when it extends axially. When thesubsidiary stress accumulates to a certain limit, the pipeline will buckle laterally.Axial walking and lateral buckling will make the pipeline strike or even damagewhich can cause huge economic losses. So the study on the axial pipe-soilinteraction of the pipeline is very important.A test chamber with reasonable size is designed for the model test. And vacuumcombined surcharge preloading method is used to make remoulded soil for themodel test. In the preparation of soft clay, new methods have been explored toimprove the uniformity of the soil.The influence of loading rate, soil strength and overlying effective pressure hasbeen studied through the model test. Under displacement control mode, the loaddisplacement curve of axial pipe-soil interaction is recorded. Analysis has been doneto explore the law of axial pipe-soil interaction.Shear parameters of pipe-soil interface and soil-soil interface have beenobtained by the interface shear test. Forecast has been done with α method,β method and finite element analysis. Possible reasons for the differencesbetween the predicted values and experimental values are given in the last.更多还原