第三纪和晚侏罗纪时期沉积的弱胶结粉细砂层在我国东北、南地区有广泛的分布。
Weak cemented fine quicksand layer deposited at the Tertiary Period and Jurassic Period is widely distributed in China's northeast and southwest regions.
基坑所处地层十分复杂，有较厚的淤泥层和细砂层，基坑支护要求高，施工难度大。
The ground stratum is quite complex, with silt layer and fine sand layer mixed, so the construction is difficult to be carried out and the requirement of pit support is strict.
基于TOUGH2的理论分析表明，砂柱排水过程中的饱和度剖面与没有细砂层时的饱和度剖面明显不同。
Theoretical analysis based on TOUGH2 show that the saturation profile is substantially different from the drainage experiment without the finer layer on the top.
进行了粗砂上部没有细砂层的均质砂柱的饱和-非饱和流排水实验以及粗砂上部存在细砂层的水气二相流排水实验。
Both saturated-unsaturated flow drainage experiment without the fine sand layer on the top of the coarse sand and air-water two-phase flow drainage experiment with the fine sand layer were performed.
前言：浙江萧山—余杭地区全新统下部粉细砂、淤泥质粘土层有机质丰富，是重要的“生气层系”，所夹的贝壳层和砂层是主要的“储气层”。
The Lower Holocene in the Xiaoshan-Yuhang area, Zhejiang, is composed of fine sand, silt and clay beds. They are rich in organic matter and constitute an important "gas source formation".
前言：浙江萧山—余杭地区全新统下部粉细砂、淤泥质粘土层有机质丰富，是重要的“生气层系”，所夹的贝壳层和砂层是主要的“储气层”。
The Lower Holocene in the Xiaoshan-Yuhang area, Zhejiang, is composed of fine sand, silt and clay beds. They are rich in organic matter and constitute an important "gas source formation".
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