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Abstract: Nanchang Metro Line 1, China was mainly excavated through argillaceous siltstone in some sections. Soil clogging happened in the early construction stage, and so deep investigation was carried out in another section of the metro line to avoid the soil clogging. Based on mineral-ogy investigation, the content of clay minerals is 40.5% in the argillaceous siltstone (kaoline 27.8%, illite 8.3%,...