Effect of Compressive Behaviours of Tail Salt Filling Materials on Roof Deformation in Potash Mine

Figure 9

Process for calculating the upper-layer top mine deflection and bending moment. Note. In the figure, ω_i, θ_i, M_i, and Q_i refer to the deflection, corner, bending moment, and shear force of each selection of the roof; d_1∼12 refer to constant coefficient; and [σ] refers to the allowable tensile stress of the roof.