FIELD: instrumentation.
SUBSTANCE: invention relates to physics of material contact interaction, namely to the method of establishment of marginal state of deformable compressing and extending load of the material medium. Essence of the invention: using the data of shift of the material medium loaded with steps of normal pressure at the depth h by the tangential load τi the curve τi = ƒ(pi) is plotted. The curve is linearised by a straight line to the crossing with the axis τI and the axis pi, on the axis τi the value of specific cohesion of the structured medium c = cstr is pre-set, on the axis pi the value of counter-pressure of the medium consolidation -pe = -cstr·ctgφstr is pre-set, and the angle φ = φstr of internal friction of the structured medium is determined. Coulomb Law τstr= pi·tgφstr+cstr is determined in the normal pressure range -(pe) ≤ pi ≤ (+ph), where ph = (γstr·h-cstr)ctgφstr - gravitational (household) pressure for the structured medium with the specific weight γstr, at the pressure pi>ph. The marginal state of the material medium is considered with the disturbed structure and described in terms of the relation τd = pd·tgφd+cd, and the marginal state of the material medium in general terms is described by a system of equations.
EFFECT: possibility of delimitation of marginal state of the material coherent medium with disturbed structural durability and establishing of regularity of the marginal state of the coherent medium outside its structural durability and Coulomb Law at the pressure pi above gravitational (household) ph, ie pi > ph.
3 dwg, 1 tbl
