Method for determining expansive force of micro-expansive mudstone foundation of high-speed rail and related device

The invention provides a high-speed rail micro-expansive mudstone foundation expansive force determination method and a related device, and relates to the technical field of expansive mudstone expansive force determination. The method comprises the following steps: firstly, acquiring microscopic parameters, then determining the crystal layer expansive force of each montmorillonite particle according to the microscopic parameters, and then determining the transverse expansive force and the vertical expansive force of all montmorillonite particles according to the crystal layer expansive force of each montmorillonite particle; according to the transverse expansive force and the vertical expansive force of the montmorillonite particles, the transverse expansive force and the vertical expansive force of the equivalent montmorillonite particles are determined, and then the expansibility quantitative value of the micro-expansive mudstone is obtained; and finally, determining the transverse expansive force and the v