Mathematical Model and Analysis of Negative Skin Friction of Pile Group in Consolidating Soil

Table 1

Influence areas of single piles.

Pile location	Influence area 𝐴𝑖
Interior pile (𝑃𝐼)	𝐴𝑃𝐼=𝜋𝑟^2−14𝜋𝐷^2−12𝐴𝑑2×4−3𝐴𝑏3×12−4𝐴𝑎×4
Edge pile (𝑃𝐸)	𝐴𝑃𝐸=𝜋𝑟^2−14𝜋𝐷^2−12𝐴𝑐2×2−3𝐴𝑏3×6−4𝐴𝑎×2
Corner pile (𝑃𝐶)	𝐴𝑃𝐶=𝜋𝑟^2−14𝜋𝐷^2−12𝐴𝑐2×2−3𝐴𝑏3×3−4𝐴𝑎