Method for determining three-dimensional stress component of tunnel and related equipment

The invention discloses a method for determining a three-dimensional stress component of a tunnel and related equipment, relates to the field of tunnel surrounding rock stress testing, and mainly aims at solving the problems that a traditional method for measuring the three-dimensional stress component of the tunnel is complicated in operation procedure and low in efficiency. The method comprises the steps that at least twelve rock samples in a tunnel are obtained, the at least twelve rock samples are obtained based on drill holes in six different directions of the tunnel, and at least two rock samples are obtained in each direction; determining optimal normal stress components in six directions based on the at least twelve rock samples; determining a target observation value expression based on the optimal normal stress components in the six directions and the three cosine expressions in each direction; and determining the three-dimensional stress component of the tunnel based on the target observation value