METHOD OF DETERMINING PHYSICAL PARAMETERS OF STRENGTH OF DEFORMED STRUCTURE OF MATERIAL MEDIUM Russian patent published in 2015 - IPC G01N3/08 G01N3/24 E02D1/00 

FIELD: physics.

SUBSTANCE: invention relates to the physics of material (contact) interaction and specifically to a method of determining the angle φ_d of internal friction and specific cohesion c_d of a material contact medium with a deformed structure, which receives pressure higher than gravitational pressure. The method of determining physical parameters of strength of a deformed structure of a material medium comprises determining, during laboratory shearing of samples of a medium of a non-deformed structure in compression conditions, the angle φ=φ_str of internal friction and specific cohesion c=c_str of the medium with a non-deformed structure while plotting a Coulomb-Mohr curve τ_i=p_i·tgφ_str+c_str of the limiting state of the medium under pressure p_i, where τ_i is shearing stress of the medium under compression pressure p_i. To determine the angle of internal friction of a medium with a deformed structure, formed upon achieving under a die a pressure equal to natural pressure p_str.n=p_n=(γ·h-c_str)ctgφ_str at a mark h of a solid of the natural composition thereof, the angle θ=φ_str+φ_d=arcsin[2sinφ_str/(1+sin²φ_str)] is determined. The angle of internal friction of the medium with a deformed structure is determined from the expression φ_d=θ-φ_str, and specific cohesion of the material medium with a deformed structure is determined from the relationship $${с}_d={с}_{str}\left[2-\frac{tg{\phi }_d}{tg{\phi }_{str}}\right].$$

EFFECT: obtaining a relationship of physical parameters of strength of a material medium loaded above natural gravitational pressure with said parameters of structural strength of the medium.

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