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近年来,兄弟省根据其自然条件,以混凝土衬砌渠道基土种类、冻前地下水位埋深与冻土深度的最小距离及冻前土壤含水量为依据,进行地基土壤冻胀等级的划分。但直到现在,尚无定量指标可循。近年来,我们结合工程设立观测点,并建立了混凝土衬砌模拟渠道露天测试场,对大、中、小型衬砌渠道进行了调查和对混凝土衬砌渠道在不同土壤地基、不同地下水位补给条件下的冻胀影响试验。提出我区混凝土衬砌渠道的地基土壤冻胀分级方案和相应的防冻措施,以供参考。
In recent years, according to its natural conditions, the Bhutan Province has classified the level of soil frost heave on the basis of the types of foundation lining of concrete lining channels, the minimum distance between the groundwater level before freezing and the depth of permafrost and the soil moisture before freezing. But until now, there are no quantitative indicators to follow. In recent years, we set up observation points in combination with engineering and set up an open field test tunnel for concrete lining simulation channels. We investigated the large, medium and small lining channels and frozen the concrete lining channels under different soil foundations and different groundwater levels Expansion impact test. Put forward my district concrete lining channel foundation soil frost heaving grading scheme and the corresponding antifreeze measures for reference.