Principles and requirements of foundation design for storage tanks

The foundation design of the storage tank should meet the requirements of foundation stability and deformation, that is, the foundation should not be crushed, and the uneven settlement value of the foundation should be within the allowable range. The uneven settlement of the storage tank foundation should specify the safe allowable range during the design process, because too large uneven settlement will reduce the safety of the storage tank and cause the wall and bottom of the storage tank to be twisted and deformed.

The cone slope of the completed storage tank foundation is 15/1000 for the general foundation, and less than 35/1000 for the soft foundation. After the foundation settlement of the storage tank is basically stable, the surface slope must be greater than eight thousandths. The edge of the tank bottom should be more than 0.3 meters above the surrounding ground. Above the ground, the tank bottom leakage detection tube should be led out from the foundation sand cushion and cross the foundation ring wall or the slope protection surface. The circumferential distance should be less than 20 meters, and each storage tank should be at least 4 detection tubes.

The settlement difference per 10m length along the circumference of the storage tank is less than 25mm, the deviation of the base center coordinate should be less than 20mm, and the deviation of the center elevation should be less than 10mm. On the top surface of the foundation supporting the tank wall, when there is a ring wall, the height difference of a point within every 10 meters in the circumferential direction is less than 6 mm, and the height difference between any two points on the entire circumference is less than 10 mm. When there is no ring wall, the height difference of each point within every 3 meters in the circumferential direction is less than 5 mm, and the height difference between any two points on the entire circumference is less than 20 mm.