一层层疏松的岩石斜躺在隧道最前端的"掌子面"上，一位头戴安全帽的工人正在清理碎石，他随手捡起两块颜色不同的石头对记者说："这斜着长的石头本来就容易塌，石头的软硬还都不一样，你看，一炮就崩出了两样石头。"这是 ... 地铁工地周边街道打孔1万多个，干啥用的？
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