Abstract Buried pipe is an important structure underneath embankment. In the frozen soil region, the destruction of pipe will directly affect the service life and benefit of road. Based on the effect of freeze-thaw action of embankment filling on pipes in the field, model tests on shallow buried PVC (Polyvinyl chloride) pipe were carried out in the temperature control laboratory. Variation of stress and strain of pipe, earth pressures around pipe and deformations of pipe were investigated under different filling loads, different layers of geogrid, symmetrical and asymmetrical freeze-thaw of soil around the pipes. The test results show that most of the upper half of the pipe is in compressive strain state, except for the 0° measuring point on the crown vertex of the pipe. And most of the lower half of the pipe is in tensile strain state. The maximum compressive stress and the maximum tensile stress are at points with an angle of 45° and 135° from the vertices of pipe, respectively. When symmetrical frost-heave of the soil occurs in the surrounding pipe, load reduction measures should be taken at the crown of the pipe. When asymmetrical frost-heave of the soil occurs in the surrounding pipe, the differential horizontal deformation of the pipe between its left and right halves is obvious, therefore the earth pressures on the lateral of the pipe should be monitored emphatically. The geogrid installed above the pipe effectively reduces the eccentric load on the pipe. The thaw-settlement of frozen soil has the greatest impact on the deformation of shallow buried pipes, which is more threatening to cause pipe damage. The test results can provide a reference for engineering design, construction and maintenance of shallow buried pipe under the soil freeze-thaw condition.

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土壤冻融条件下管道力学性能模型试验研究

摘要 埋管是路堤下的重要结构。在冻土地区，管道的破坏将直接影响道路的使用寿命和效益。基于路堤填料对现场管道冻融作用的影响，在温控实验室对浅埋PVC（聚氯乙烯）管道进行了模型试验。研究了不同充填荷载、不同土工格栅层数、管周土体对称和非对称冻融条件下管道应力应变、管周土压力和管道变形的变化规律。试验结果表明，除管子冠顶0°测量点外，管子上半部分大部分处于压应变状态。并且管子的下半部分大部分处于拉伸应变状态。最大压应力和最大拉应力分别位于与管道顶点成 45° 和 135° 角的点。当周围管道发生对称性土体冻胀时，应在管道顶部采取减载措施。当周围管内发生土体不对称冻胀时，管的左右半部水平变形差异明显，因此应重点监测管侧土压力。安装在管道上方的土工格栅有效地减少了管道上的偏心载荷。冻土的解冻沉降对浅埋管道变形的影响最大，更容易造成管道损坏。测试结果可为工程设计提供参考，