一种新的分层冻胀量观测方法及其在季节冻土区的应用

Observation of delamination frost-heave is of significance in the study of foundation frost damage. The three main methods of observing delamination frost-heave, which are mono-frost-heave-ruler method, multi-frost-heave-ruler method and magnetic-loop method, are briefly introduced in this paper at first. Their respective advantages and disadvantages are analyzed. And then, according to the mechanism of frost-heave and the law of water migration and ice-forming in the freezing soil, a new approximate indirect method of observing the delamination frost-heave, which is antitheses, is brought forward by comparing surface frost-heave and frost-depth. On the basis of observation result in Chengyu Expressway and Daqing, its applicability is analyzed from three aspects under different groundwater level and soil property in seasonal frozen area. The result shows that this method is applicable for these two areas.     

非饱和介质中甲烷水合物形成与分解的水分变化特征

多孔介质中甲烷水合物形成与分解过程的水分变化研究对了解自然件下沉积物中天然气水合物的形成与分解机制具有重要意义.本研究中,我们首次利用可探测土壤内部水分及温度变化的pF-meter探头,对甲烷水合物形成与分解过程中非饱和粗砂和粉砂质粘土内的水分变化特征进行了研究.结果表明:甲烷水合物的形成与分解过程可仅引起非饱和粗砂内水分的重新分布;甲烷水合物在非饱和粉砂质粘土中容易形成也容易分解.     

饱和粗砂、粉土内甲烷水合物形成与分解过程中的水分迁移规律

用可探测土壤水分变化的pF-meter探头组装了新型水合物研究设备,并对两种饱和介质内甲烷水合物形成与分解过程中的水分迁移规律进行研究,以期望能为进一步探索多孔介质内甲烷水合物形成与分解机制提供参考.通过实验发现相同条件下,不同饱和介质内生成的甲烷水合物形态存在较大差异,且形成过程中的水分迁移规律也不同;水合物分解过程...