Pile net composite foundation round chamfer pile cap and construction method and design method thereof

Abstract

The pile net composite foundation round chamfer pile cap comprises a pile cap body, the horizontal top face and the vertical side face of the pile cap body are connected through a round chamfer, and the vertical side face and the horizontal bottom face of the pile cap body are connected in a right-angle mode. According to the pile cap, fracture and damage of the geogrid caused by the cutting effect are avoided.

Description

technical field [0001] The invention relates to the field of subgrade engineering, in particular to a round chamfered pile cap of a pile-net composite foundation, and a construction method and a design method of a round-chamfered pile cap of a pile-net composite foundation. Background technique [0002] Pile-net composite foundation is a commonly used foundation reinforcement method for subgrade engineering in soft soil areas. Due to the characteristics of high porosity and moisture content, low permeability coefficient and compressive modulus of soft soil, the drainage consolidation process cannot be completed in time when the subgrade construction is fast. , resulting in a large settlement of the soil between the piles after the roadbed was put into operation, and further led to the separation of the soil between the piles from the geogrid and the cushion. The cushion between the geogrid and the pile cap is mainly used to prevent the cutting effect of the edge of the pile ...

AI Technical Summary

Problems solved by technology

[0002] Pile-net composite foundation is a commonly used foundation reinforcement method for subgrade engineering in soft soil areas. Due to the characteristics of high porosity and moisture content, low permeability coefficient and compressive modulus of soft soil, the drainage consolidation process cannot be completed in time when the subgrade construction is fast. , leading to a large settlement of the soil between the piles after the subgrade is put into operation, and further leads to the separation of the soil between the piles from the geogrid and cushion

The cushion between the geogrid and the pile cap is mainly used to prevent the cutting effect of the edge of the pile cap on the geogrid. However, due to the excessive settlement of the soil between the piles, the filler of this layer will fall to the void area between the piles, and the geogrid will be under tension. Fracture damage occurs under the action of pulling and pile cap edge cutting, resulting in partial failure of the pile network composite foundation, excessive settlement of the roadbed after construction, and difficult repairs, posing a greater threat to the safe and comfortable operation of the high-speed railway

[0003] According to the existing indoor and field test research, in the existing pile cap form, the top surface and the side are connected at right angles, the cutting effect of the sharp pile cap edge on the geogrid always exists, and the geogrid at the pile cap edge The tensile force is significantly greater than that of the geogrid in the center of the pile cap and the soil between the piles. The cushion between the pile cap and the geogrid can only play a role in relief, and it is prone to failure after excessive settlement of the soil between the piles , the problem of geogrid being cut and damaged cannot be avoided from the root

In addition, the distribution area of ​​the large tension value of the geogrid at the edge of the pile cap is very small, and it will be very uneconomical to use the maximum tension value in a small range as the basis for the overall design of the geogrid

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