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深圳某地铁车站，地下二层，基坑开挖深１６～１７ｍ，基坑围护结构采用１２００人工挖孔桩（密排布置），桩长２１ｍ，基坑平面尺寸为１９．１ｍ×２３７．１ｍ，开挖过程中采用６００钢管对围护结构分层支撑。１地质状况地质报告表明，车站范围内地层从上至下主要为：（
Shenzhen subway station, the second basement, pit excavation depth 16 ~ 17m, foundation pit retaining structure using 1200 artificial digging pile (close arrangement), pile length 21m, foundation pit size of 19.1m × 237 .1 m, excavation process using 600 steel pipe support structure layered support. 1 Geological conditions Geological reports show that the stratigraphic strata from top to bottom are mainly: (