Data for: Model test study on mechanical properties of pipe under the soil freeze-thaw condition

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.埋地管道是路堤下方的重要结构体。在冻土区中，管道破损将直接影响道路的服役寿命与使用效益。基于现场路堤填料冻融作用对管道的影响规律，本研究在温控实验室中开展了浅埋聚氯乙烯（Polyvinyl chloride，PVC）管道的模型试验。针对不同填料荷载、不同土工格栅层数，以及管道周围土体的对称与不对称冻融工况，探究了管道应力应变、管周土压力及管道变形的变化规律。试验结果表明：除管道管顶顶点处的0°测点外，管道上半区域大多处于压应变状态，下半区域则大多处于拉应变状态。最大压应力与最大拉应力分别出现在距管顶顶点45°与135°的测点位置。当管道周围土体发生对称冻胀时，应在管顶区域采取卸荷措施。当管道周围土体发生不对称冻胀时，管道左右两侧的水平差异变形较为显著，因此需重点监测管道侧部的土压力。铺设于管道上方的土工格栅可有效降低管道承受的偏置荷载。冻土融沉对浅埋管道的变形影响最为显著，更易引发管道破损。本试验结果可为冻融循环条件下浅埋管道的工程设计、施工与运维提供参考依据。