require.mx('mxjs/geotech/xrockstrength.js');
This library contains functions for the formulation of rock mass strength.
The
Hoek-Brown strength envelope is based on the 2002 strength envelope formulation.
Hoek-Brown strength parameters for rockmasses under squeezing and spalling conditions is based on
Carter et al. (2008) Application of modified Hoek-Brown transition relationships for assessing strength and post yield behaviour at both ends of the rock competence scale. J. S.A. Ist. Min. Metal., vol 108, pp 325-338
The
General formulation contains a seamless transition between Carter et al. (2008) formulation from squeezing through general Hoek-Brown behaviour to spalling conditions.
The
Xgeneral formulation provides a Generalised Hoek-Brown failure criterion with implicit Tensile strength.
Please note: Carter et al. (2008) and other papers published by the authors on the same subject contains a typing error in one of the equations that is corrected in this implementation.
Status | Name |
---|---|
Number Carter.General.a
(
Number UCS,
Number T,
Number GSI,
Number D,
Number a_spl
)
Generalised Hoek-Brown rockmass a |
|
Number Carter.General.m
(
Number UCS,
Number mi,
Number T,
Number Fi,
Number GSI,
Number D,
Number a_spl
)
Generalised Hoek-Brown rockmass m |
|
Number Carter.General.s
(
Number UCS,
Number T,
Number Fi,
Number GSI,
Number D,
Number a_spl
)
Generalised Hoek-Brown rockmass s |
|
Number Carter.General.sigma1
(
Number s3,
Number UCS,
Number mi,
Number T,
Number Fi,
Number GSI,
Number D,
Number a_spl
)
Generalised Hoek-Brown failure criterion |
|
Number Carter.Spall.a
(
Number UCS,
Number T,
Number GSI,
Number D,
Number a_spl
)
returns the Hoek-Brown rock mass a for spalling conditions |
|
Number Carter.Spall.m
(
Number UCS,
Number mi,
Number T,
Number Fi,
Number GSI,
Number D,
Number a_spl
)
returns the Hoek-Brown rock mass m for spalling conditions |
|
Number Carter.Spall.s
(
Number UCS,
Number T,
Number Fi,
Number GSI,
Number D,
Number a_spl
)
returns the Hoek-Brown rock mass s for spalling conditions |
|
Number Carter.Squeeze.a
(
Number UCS,
Number GSI
)
returns the Hoek-Brown rock mass a for squeezing conditions |
|
Number Carter.Squeeze.m
(
Number UCS,
Number mi,
Number GSI,
Number D
)
returns the Hoek-Brown rock mass m for squeezing conditions |
|
Number Carter.Squeeze.s
(
Number UCS,
Number GSI,
Number D
)
returns the Hoek-Brown rock mass s for squeezing conditions |
|
Number Carter.Xgeneral.a
(
Number UCS,
Number mi,
Number GSI,
Number D,
Number a_spl
)
Generalised Hoek-Brown with implicit T rockmass a |
|
Number Carter.Xgeneral.m
(
Number UCS,
Number mi,
Number Fi,
Number GSI,
Number D,
Number a_spl
)
Generalised Hoek-Brown with implicit T rockmass m |
|
Number Carter.Xgeneral.s
(
Number UCS,
Number mi,
Number Fi,
Number GSI,
Number D,
Number a_spl
)
Generalised Hoek-Brown with implicit T rockmass s |
|
Number Carter.Xgeneral.sigma1
(
Number s3,
Number UCS,
Number mi,
Number Fi,
Number GSI,
Number D,
Number a_spl
)
Generalised Hoek-Brown with implicit T failure criterion |
|
Number HoekBrown.a
(
Number GSI
)
returns the Hoek-Brown rock mass a |
|
Number HoekBrown.failureValue
(
Number s1,
Number s3,
Number UCS,
Number m,
Number s,
Number a
)
returns a strength factor formulation of the given (s1, s3) stress state
|
|
Number HoekBrown.failureValue3D
(
Number I1,
Number J2,
Number theta,
Number UCS,
Number m,
Number s,
Number a
)
returns a value quantifying the distance from the hoek-brown failure locus. |
|
Number HoekBrown.fit_hypercube_in_tangent
(
Number GSI
)
returns ... |
|
boolean HoekBrown.hasFailed
(
Number s1,
Number s3,
Number UCS,
Number m,
Number s,
Number a
)
returns "true" for failure state and "false" otherwise |
|
boolean HoekBrown.hasFailed3D
(
Number I1,
Number J2,
Number theta,
Number UCS,
Number m,
Number s,
Number a
)
returns "true" for failure state and "false" otherwise |
|
Number HoekBrown.m
(
Number mi,
Number GSI,
Number D
)
returns the Hoek-Brown rock mass m |
|
Number HoekBrown.s
(
Number GSI,
Number D
)
returns the Hoek-Brown rock mass s |
|
Number HoekBrown.sigma1
(
Number s3,
Number UCS,
Number m,
Number s,
Number a
)
|
|
Number HoekBrown.sigma3
(
Number s1,
Number UCS,
Number m,
Number s,
Number a
)
Hoek-Brown strength envelope σ 3 as a function of σ 1. for intact rock only as the current formulation assumes a = 0.5 |
returns parameters for the Hoek-Brown failure criteria for the squeezing and spalling conditions based on the methods proposed by Carter et al. (2008)
Generalised Hoek-Brown failure criterion as defined by Carter et al. 2008 Transition is done from Squeezing and Spalling formulations through the standard hoek Brown fomulation
returns the Hoek-Brown rock mass parameters for spalling conditions.
returns the Hoek-Brown rock mass parameters for squeezing conditions.
Having to specify the value for T leaves a lot of room for error. Assuming the Hoek-Brown failure criterion, we can substitute the T with UCS/mi to get a more robust formulation. Generalised Hoek-Brown failure criterion with implicit T
Functions for the Hoek-Brown Failure criteria 2002
returns a value quantifying the distance from the hoek-brown failure locus.
Parameters:Number
I1 - first invariant of stressNumber
J2 - second invariant of stress deviationNumber
theta - the "asin formulation" Lode AngleNumber
UCS Number
m Number
s Number
a Number
Value. - For Value=0 => on the locus, Value>0 ourside the locus, i.e. failure, Value < 0 => inside locus