冻土区管道上浮屈曲临界载荷试验研究

Research on Experimental Method of Upheaval Buckling of Pipeline in Permafrost Zone

进行了管道上浮屈曲模拟试验方法研究,制作了管道上浮屈曲临界载荷试验装置,模拟了多种影响管道上浮屈曲的因素,测试管道轴向屈曲临界载荷,为研究管道上浮屈曲临界载荷提供试验依据。初步试验结果表明,管道上浮屈曲临界轴向载荷随着管道外径的增大而增大,随土壤冻胀量的增大而减小,随着管道下方冻胀长度的增大先增大后减小。

Experimental methodologies of pipeline buckling are investigated on an initial stage. Critical axial buckling load of different pipeline structures under separate influential factors are simulated utilizing pipeline buckling experimental instruments manufactured based on theories mentioned above so as to specify effects of different factors on critical load, which provides reliable experimental data for research of pipeline buckling. As the outcomes of experiment demonstrates, in terms of buckling phenomenon of straight pipeline, its critical axial load rises with increasing frost-heave amount, rising resistance coefficient of soil and expanding diameter of pipelines. In addition, the critical load increases initially and decreases later while length of frostheave pipeline increases.