Foundation for wind turbine generator

A computer-implemented method of modeling behaviors of a base for a wind turbine tower, the base including a plurality of individual shaft piles, a base cap connected to each of the individual shaft piles, the base cap including a plurality of reinforcement inserts in the base cap for reinforcing the base cap, and a plurality of anchoring units embedded in the base cap and extending in an anchoring direction from the base cap at anchoring locations for anchoring the wind turbine tower to the base cap such that each of the reinforcement inserts extend in a radial direction relative to a center axis of the wind turbine tower and at least one of the plurality of reinforcement inserts, at a radius associated with the center axis and adjacent to an anchoring location of a respective anchoring unit, has a portion of the respective reinforcement insert extending along the anchoring direction, the method comprising the steps of:

• calculating, by a computer, post-tension force on each anchoring unit using load relaxation, material creep, and load distribution between or among at least the plurality of individual shaft piles, the base cap and the plurality of anchoring units, as components of the base;
• analyzing, by the computer, stress levels in the components of the base including reinforcement inserts;
• and
• adjusting a size or a number of the plurality of individual shaft piles to support the wind turbine tower in accordance with the post-tension force and stress levels associated with the components of the base.

A method of constructing a base for a wind turbine tower, the method comprising the steps of:

• drilling from a base level to establish a plurality of boreholes;
• installing base piles for each of the plurality of boreholes;
• establishing an open trench in the base level between two of the base piles;
• filling at least the open trench with a mud slab;
• positioning a base cap on the mud slab;
• and
• connecting the base cap to each of the base piles to support the wind turbine tower.

A computer readable storage medium for storing program code executable on a computer to implement the method of modeling behaviors of a base for a wind turbine tower, the method comprising the steps of:

• calculating post-tension force on each of a plurality of anchoring units using load relaxation, material creep, and load distribution between or among at least a plurality of individual shaft piles, a base cap and the plurality of anchoring units, as components of the base;
• analyzing stress levels in the components of the base;
• and
• adjusting a size or a number of the plurality of individual shaft piles to support the wind turbine tower in accordance with the post-tension force and stress levels associated with the components of the base.