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油管道运行过程会干扰土壤温度和水分的自然运移,为了使水热迁移对冻土状态施加的扰动更为形象化,对冻土力学变化进行数值分析。对水热迁移引起的冻土骨架、孔隙结构的小范围变化进行分析。根据模拟计算结果,水热迁移对冻土施加的作用直观表现为:在环境气温低的月份,冻土应力增大,应变减小;在环境气温高的月份,冻土应力减小,应变增大;这种趋势源于环境气温变化对管道与冻土交互换热幅度及冻土水热运移状态的改变。本质原因:随温度上升,孔隙内的胶质结构被破坏,孔隙结构被挤压变形,表现为孔隙度、孔径变小,水分运移加速,对冻土骨架产生应力、压力作用,同时降低骨架强度。
Oil pipeline operation will disturb the natural migration of soil temperature and moisture. In order to visualize the disturbance of hydrothermal migration on the frozen soil, the mechanical analysis of frozen soil is carried out. Frozen soil skeleton induced by hydrothermal migration was analyzed for small-scale changes in pore structure. According to the results of the simulation, the effect of hydrothermal migration on the frozen soil can be directly visualized as follows. In the month when the ambient temperature is low, the stress of the frozen soil increases and the strain decreases. In the month with high ambient temperature, the stress of the frozen soil decreases and the strain increases Large; this trend stems from changes in ambient temperature on the interaction between pipe and frozen soil heat exchange rate and the change of frozen water and heat transfer. Essence of the reason: as the temperature rises, the pore structure of the glial structure is destroyed, the pore structure is squeezed deformation, the performance of porosity, pore size smaller, accelerated water migration, the frozen soil skeleton stress and pressure, while reducing the skeleton strength.