1.防治流沙。在松软的地层中遇到流沙,可以下水泥盘。盘的厚度为50厘米,宽度要比砖大2厘米。这种水泥盘可以在井下制作。为了节约木材,可挖成土模或垒成砖模。盘的外侧做成斜面,便于下沉。盘上砌砖要留水眼,砖筒外填好小卵砾石或 1. Prevent quicksand. When encountering quicksand in a soft formation, you can place a cement plate. The thickness of the disc is 50 cm and the width is 2 cm larger than the brick. This cement tray can be made downhole. In order to save wood, they can be dug into earth molds or bricks. The outside of the plate is made to be beveled so that it can sink easily. Keep bricks on the plate, fill in pebbles outside the brick or