Elliptic Equation of Plastic Area Boundary around the Circular Laneway in Nonuniform Stress Field

<div>Circular laneway force model in nonuniform stress field. <i>a</i>: laneway radius; <i>r, θ</i>: polar coordinates of any point on the boundary; <i>P</i><sub>1</sub>: maximum confining pressure; <i>P</i><sub>3</sub>: minimum confining pressure.</div>

Shock and Vibration

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Figure 2

Figure 2: Elliptic Equation of Plastic Area Boundary around the Circular Laneway in Nonuniform Stress Field 