Rapid simulation modeling method for multi-field coupled discrete elements of soil water loss and cracking

The invention provides a rapid simulation modeling method for multi-field coupled discrete elements of soil water loss and cracking which is a multi-field coupled discrete element modeling and simulation method used in cohesive soil water loss and cracking. The method comprises following steps: 1) constructing a three-dimensional close packing discrete element model, giving the water content attribute to the element, and using the finite difference theory to simulate a water field; 2) building coupling of the water field and a stress field taking account of influences on mechanical properties such as tensile strength of discrete elements from water field; 3) assuming that the surface water content of the soil three-dimensional close packing discrete element model evaporates at a certain speed, the relationship between the water content and the three-dimensional discrete element shrinkage of the soil is established based on the experimental data, and the deformation and fracture of the three-dimensional discre