Pressuremeter Test (PMT) Flashcards
A ______________is a narrow shaft bored in the ground, either vertically or horizontally.
borehole
The pressuremeter is an ___________ test conducted in a borehole.
in situ
Pressurementer was originally developed by ______________ to measure strength and ____________________ of soil.
Menard, deformability
Pressuremeter test has been adopted by ASTM as Test Designation _____
4719
The Menard Type PMT has a probe with three ___________. The top and bottom are _____________ and the middle one is _______________.
cells, guard cells, measuring cell
Pressuremeter test is conducted in a prebored hole with a diameter between _______ and ______ the nominal diameter of the probe.
1.03, 1.2
The guard cells in a pressuremeter are expanded to reduce the end - condition effect on the measuring cell which has a volume of _______ cm^3.
535
The probe of a pressuremeter that is commonly used has a diameter of ____ mm and a length of ______ mm
58, 420
In pressuremeter test, the soil is considered to have failed when the total volume of the expanded cavity (V) is about _______ the volume of the original cavity.
twice
The results of the pressuremeter test are expressed in the graphical form of _________ versus ________________.
pressure, volume
The ________ reperesents the RELOADING portion during which the soil around the borehole is pushed back into its initial state ( the state it was in before drilling).
The pressure Po, in the graph represents in situ ________________ stress.
Zone I
horizontal
Zone II represents a ______________ zone in which the cell volume versus cell pressure is practically linear.
pseudoelastic
_______________ pressure is the maximum effective vertical overburden stress that a particular soil sample has sustained in the past.
Preconsolidation
The zone marked III is the _________ zone.
The pressure ____ reperesents the limit pressure
The pressuremeter modulus, Ep, of the soil is determined with the use of the theory of ____________of an infinitely thick cylinder.
plastic
pl
expansion
The pressuremeter modulus can be solved using the formula
Ep=
the poisson’s ratio in pressuremeter may be assumed to be _______
Ep= 2 (1+Us)(Vo + vm) (delta p/delta v)
0.33
In pressuremeter test, the limit pressure, pl is usually obtained by ___________ and not by direct measurement
extrapolation
In order to overcome the difficulty of preparing the borehole to the proper size, ____________________ has also been developed.
Self - boring pressuremeters (SBPMT)
Typical values for Np in finding the undrained shear strength in a pressuremeter test is ___________.
5-12
The primary parameter measured in a pressuremeter test that helps determine soil deformability.
Pressure and Volume
The type of soil property estimated using the slope of the elastic portion of the pressure-volume curve.
Elastic Modulus
The type of material (soil or rock) in which a pressuremeter test is most commonly conducted.
Soil and Soft Rock
The type of foundation design parameter that can be estimated using pressuremeter test results.
Bearing Capacity
The theoretical concept that explains the expansion of a cavity in soil under pressure.
Cavity Expansion Theory
Soil Types Where PMT is Less Effective
Highly collapsible soils, Very hard, dense soils and intact rock, Highly organic soils (peat)
