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Give collectivity distortion trend in zone of swelling wall rock tunnel.
给出膨胀土围岩地区隧道变形的总体趋势。
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The swelling soil in Hefei zone was formed at the Q3 epipleistocene of the 4th subage or before. It belongs to the type of Huaihe alluviation and diluvion.
合肥地区膨胀土形成于第四纪上更新世Q_3及其以前，属江淮冲积、洪积成因类型。
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