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采用现场取样、实验室测定含水率的方法,观测了土壤冻结阶段、稳定冻结阶段和融解阶段地面裂缝垂直方向上的冻土深度和土壤含水率,并与邻近无裂缝区的冻土做了比较,以研究裂缝对季节冻土区土壤冻结滞水的影响。结果表明:地面裂缝作为土体与外界水、热交换的通道,改变了裂缝两侧的水热状况,增大了冻土厚度,加剧了土壤冻结、融化过程;在冻结阶段使土壤水分向裂缝附近迁移,融解阶段使水分散失加剧。总的看,裂缝使土壤含水率较无裂缝区多散失30%左右,这种现象在裂缝密集的采煤沉陷区表现的更为典型。
The method of field sampling and laboratory determination of water content was used to observe the frozen soil depth and soil moisture content in the vertical direction of the soil freezing stage, the stable freezing stage and the thawing stage and compared with the frozen soil in the adjacent non-cracked area To study the effect of cracks on soil freezing stagnant water in seasonal frozen soil. The results show that as a channel of water and heat exchange between the soil and the outside world, the ground fissures change the water and heat conditions on both sides of the fissure, increase the thickness of the frozen soil and aggravate the freezing and thawing process of the soil. In the freezing stage, Near the migration, melting stage so that water loss intensified. In general, cracks cause the water content of the soil to be lost by about 30% more than that of the non-cracked area. This phenomenon is more typical in the subsidence-prone coal mining subsidence area.