FIELD: physics.
SUBSTANCE: invention relates to a method of determining the overall modulus of deformation Eo and modulus of elasticity Eupr of a material medium in gravitation pb and atmospheric pressure conditions. The method comprises using samples of the medium collected at a depth h (cm) to determine specific weight γstr (kg/cm3), internal friction angle
and specific cohesion sstr (kG/cm2); calculating, for a disrupted structure of the medium, an angle
and specific cohesion sn=sstr[2-tgφn/tgφstr] (kG/cm2); determining gravitational pressure
and
the effective initial critical compression pressure of the sample of the medium in compression conditions
Poisson ratios in the mass - as
and
in the walls- as
in compression conditions - as
testing the medium Si=f(Δpi-const,t) during a time t in increasing static load steps Δpi (kG/cm2) while generating pressure on the medium which is equal to gravitational (normal) pressure
unloading the medium to zero pressure p2=0 (kG/cm2); loading the medium with pressure
and pressure
while measuring corresponding medium residues
S2=S0 (cm),
S4 =
stabilised over time t, and the overall moduli of deformation and elasticity of the medium are calculated using the following relationships when testing the medium with a die: 1) from the free surface of half-space
and
where
B and dkr are the width and diameter (cm), Fkr is the area of the die (cm2); 2) in the mass of the medium with a helical-blade die
and
where
3) at the bottom of a vertical opening
and
where
4) in the walls of the vertical opening under thrust dies
and
where
5) in well walls under an elastic radial die of a three-chamber pressuremeter
and
where
l0 is the length of the working chamber (cm); 6) in well walls under an elastic die of a single-chamber pressuremeter
and
where
RkrI, Rb,
denote the greater radii of the ellipsoid of the inflated chamber of the pressuremeter (cm); 7) in the compression chamber of a laboratory device
and
.
EFFECT: high accuracy.
10 dwg, 1 tbl
н - d
атм - atm
ср - sr
кг/см - kG/cm2
стр - str
б - b
kpl - kpl
ср. сж - mc
нн - nd
м - m
B - β
к - с
шт - d
пп - hs
упр - el
кр - cr
вш - hbd
пр - pr
шт -d
вш - sd vd
Authors
Dates
2015-10-27—Published
2014-07-16—Filed