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“锅盖效应”是指非饱和土中由于上覆结构密闭导致水分不能排出而引起的浅层土体含水率增加的现象。干旱、半干旱寒冷地区地下水位低,毛细作用向上输水范围有限,几乎不能直接补充土体浅层水分。故认为“锅盖效应”水分主要来源于温差驱动迁移而来的气态水在浅层土体中形成的冷凝或冷冻水。通过对冷凝或冷冻条件下“锅盖效应”的室内试验,结合试验数据对“锅盖效应”进行分析,提出相应的灾害防治方法。结合“锅盖效应”的形成机理,分析哈大高铁冻胀问题并给出了相应的建议。
“Lid effect ” refers to the phenomenon of increased moisture content of shallow soil caused by the water can not be discharged due to the overlying structure closed in unsaturated soil. Arid and semi-arid cold areas have low groundwater levels and limited upward wicking of capillaries, making it almost impossible to directly replenish shallow soil moisture. Therefore, the “lid effect” moisture mainly comes from the temperature difference driven by the migration of gaseous water in the formation of shallow soil condensation or chilled water. Through the indoor test of “lid effect ” in the condition of condensation or freezing, combined with the experimental data to analyze “lid effect ”, put forward the corresponding method of disaster prevention and control. Combining with the formation mechanism of “lid effect”, this paper analyzes the problem of frost heaving of Harbin-Dalian high-speed railway and gives some suggestions.