Drucker-Prager model

The Drucker-Prager model is a mathematical way to predict how materials like soil, sand, and some rocks will deform or fail under different types of forces. It considers both the pressure (how much the material is squeezed) and the shear stress (how much it is twisted or sheared). By combining these factors, the model helps engineers understand when a material might start to flow or break, aiding in the design of foundations, tunnels, and other structures that interact with such materials. It provides a practical approximation of complex failure behaviors in geotechnical applications.