Of practical interest is the establishment by calculation of the dependence of the uniaxial compression strength on the stable parameters of strength and deformation properties of rocks and the size of samples ...

It is known that the rocks in the sides of horizontal excavations are destroyed either by shearing on one or another sliding surface or by tearing off the near-contour zones of the massif on vertical surfaces. Fracture by shear is well explained from the position of the theory of limit equilibrium of a cohesive bulk medium. The second possible type of fracture - detachment of contour zones has no clear explanation.

Wooden rods, which usually have a wedge-slot construction and possess low weight, low cost, ease of manufacture, non-deficiency of material, are rarely used. The reasons for this are the low bearing capacity of the deep lock of such rods, not exceeding 1 -1,5 tons, short life and low resistance to shear forces...

Bearing capacity of the lock of a metal rod of the spacer type, as indicated by O. V. Timofeev, is expressed by the dependence...