A method for calculating the uplift bearing capacity of a shallow-buried rigid pile foundation

By calculating the ultimate uplift bearing capacity of shallow-buried rigid pile foundations in mountainous transmission lines, the problems of unsafe design and poor economy in existing technologies have been solved, and the accuracy and economy of foundation design have been improved.

CN115878945BActive Publication Date: 2026-04-14GUIZHOU ELECTRIC POWER DESIGN INST
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Patent Information

Application Number
CN202211468321.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-11-22
Publication Date
2026-04-14
Estimated Expiration
2042-11-22

AI Technical Summary

Technical Problem

Existing technologies cannot effectively utilize the uplift bearing capacity of soil and rock when the uplift load on the foundation of power transmission lines in mountainous areas is small and the burial depth is not great, resulting in unsafe design and poor economic efficiency.

Method used

A calculation method for shallow-buried rigid pile foundations is adopted. By determining the unit weight, internal friction angle, and cohesion of the soil and rock mass within the pile foundation area, the ultimate shear stress and shear force at different depths are calculated. Combined with soil mechanics principles, the ultimate uplift bearing capacity of the foundation is accurately calculated.

Benefits of technology

This approach enables full utilization of the tensile bearing capacity of soil and rock in foundation design, avoids unnecessary increases in foundation size, and improves the safety and economy of the design.

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Abstract

The application discloses a calculation method of uplift bearing capacity of a shallow-buried rigid pile foundation, and comprises the following steps: S1, determining the specific weight gamma, internal friction angle phi and cohesive force c of the rock-soil body in the pile foundation buried depth range; S2, calculating the limit shear stress tau of the rock-soil body vertical fracture surface at different depths xz ; S3, calculating the shear stress of the rock-soil body at different depths; S4, calculating the shear force of the rock-soil body at different depths; and S5, adding the shear forces at different depths to obtain the foundation limit uplift bearing capacity T uk . According to the soil mechanics principle, the limit equilibrium theory of the rock-soil body is utilized, the shear strength of the rock-soil body under the uplift limit equilibrium state is derived from the basic physical and mechanical parameters of the rock-soil body, and then the uplift bearing capacity of the foundation is calculated from the shear strength. The uplift bearing capacity of the upper soil body is fully considered, which is favorable for accurately designing the foundation size and avoiding unnecessary waste.
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