Research Article

A Time-Dependent Double Hardening Model for Soft Rock

Table 2

Model parameters.

Parameters of softrock modelType of parameterTypical values

Young’s modulus E (kPa)Value800000.0
Poisson’s ratioValue0.2
Elastic modelType1
Cyclic modelType2
Plastic modelType5
RmaxCompression0.001
RrCompression1.6
kfCompression1.1
RmaxExtension0.0005
RrExtension1.15
kfExtension1.01
BcontAll0.3
CcontAll0.1
ΑIsotach1.15
MIsotach0.035
εir-refIsotach0.1e − 9
Cohesion (kN/m2)Value1230
FrictionDegree12
Dilatancy parameterValue900
Dilatancy cutoffValue0.10
Unit weight, γt, (kN/m3)Value19