1. Slope of foundation pit collapse.
Collapse is usually happened at construction stage or just construction completion. Exploring its reason, most situations are happened without following designed demand. During construction of soil nail system, seriflux in drill hole should be kept full to increase cohesiveness between soil nail and surrounding stratum, which can prevent collapse.
2. Horizontal displacement of slope is big.
The worse geological condition in foundation pit is, the larger horizontal displacement of support structure and soil body is. Generally, soil body’s horizontal displacement is larger than surrounding support structures. Facing