22 first-class construction engineer Municipal golden test point well system basis, first-class construction student notes, long press and like + forward + evaluation continue to be updated, Wendang version click on my avatar and send a private message to me: 2022
is determined based on the plane shape of the precipitation area, the depth of precipitation, the direction of groundwater flow, and the nature of the soil.
When the width of the foundation pit (trough) is less than 6m and the precipitation depth does not exceed 6m, a single well point can be used to arrange it on the upstream side of the groundwater; when the width of the foundation pit (trough) is greater than 6m or the soil quality is poor, and the permeability coefficient of is large, a double well point should be used to arrange it on both sides of the foundation pit (trough). When the area of the foundation pit is large, an annular well point should be used. The entrance and exit paths of excavation and transportation equipment can be not closed, with a spacing of up to 4m, and are generally left in the downstream direction of groundwater.
Foundation pit reinforcement (soil reinforcement in the passive area in the foundation pit)
According to pier reinforcement, soil reinforcement is generally arranged in the positive corner position or the middle span area around the foundation pit;
long strip foundation pit can be considered for reinforcement with pull strips;
When the foundation pit is large, skirt reinforcement should be used;
subway station end wells are generally reinforced by grille;
high environmental protection requirements, or when the groundwater is closed, full-house reinforcement can be used.
