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。

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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.

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。

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Fort building is Wong, lime, fine sand mixing, layer by layer filling compaction, very strong.

炮台建筑采用黄泥、石灰、细砂拌和，逐层填筑夯实，非常坚固。

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