Fig. 1 Dangerous rock models with water at different stages of main control structural plane： （a） completely filled with water； （b） beginning to freeze； （c） completely filled with ice； （d） beginning to melt
Note：H： height of dangerous rock （m）； l0： initial length of main control structural plane （m）； b： aperture of main control structural plane （m）； θ： angle between structural plane and vertical direction （°）； l1， l2： vertical and horizontal distance from point O at tip of main control structural plane to point G of center of gravity （m）； li： ice-filled length within main control structural plane （m）； lw： water-filled length within main control structural plane （m）.
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