Abstract
The integrity coefficient Kv of bed rock is one of the important approaches to evaluate the stability of engineering rock mass, but this parameter is difficult in frequent field tests. The integrity coefficient is the quantitative index for evaluating the complete deformation of rock mass, while the damage variable represents the level of damage of the jointed rock mass, and both have similar physical meanings and represent the degree of deterioration of surrounding rock. Damage variables and damage constitutive models were constructed based on Weibull distribution damage model and Synthetic Rock Mass (SRM) model. The relationship between damage variables and numerical calculation and damage constitutive curves of different weathered granite rocks in Hongtuzhang tunnel was calculated. A new method for evaluating integrity coefficient of rock mass is proposed.
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Abbreviations
- BQ:
-
Basic quality of rock mass
- [BQ]:
-
Modified basic quality of rock mass
- D :
-
Two damage coupled states damage variable
- D 0 :
-
Initial damage variable
- D mx :
-
Ball maximum diameter, mm
- D min :
-
Ball minimum diameter, mm
- D s :
-
Load damage variable
- E 0 :
-
Elastic modulus of intact rock, GPa
- E*:
-
Elastic modulus of rock mass, GPa
- E c :
-
Elastic modulus of ball, GPa
- \({\bar E_c}\) :
-
Elastic modulus of bond, GPa
- K 1 :
-
Correction coefficient of groundwater state influence
- K 2 :
-
Correction coefficient of occurrence influence of main weak structural plane
- K 3 :
-
Correction coefficient of initial stress state influence
- k n :
-
Normal stiffness of ball, GPa
- \({\bar k_n}\) :
-
Bond normal stiffness, GPa
- k nj :
-
Joint normal stiffness, GPa
- k s :
-
Shear stiffness of ball, GPa
- \({\bar k_s}\) :
-
Bond shear stiffness, GPa
- k sj :
-
Joint shear stiffness, GPa
- Kv :
-
Integrity coefficient
- m :
-
Shape Parameter of Weibull Distribution
- n :
-
Number of microcracks
- P 10 :
-
Linear density of structural plane, item/m
- R c :
-
Uniaxial saturation ultimate compressive strength, MPa
- V pm :
-
P wave velocity of bed rock in testing area, km/s
- V pr :
-
P wave velocity of intact rock in testing area, km/s
- ε :
-
Strain, %
- ε 0 :
-
Reference strain of Weibull Distribution
- ε f :
-
Strain at peak stress, %
- φ :
-
Joint dilation angle, °
- \(\bar \lambda \) :
-
Radius multiplier of bond
- μ :
-
Friction coefficient
- ν :
-
Poisson’s ratio
- σ :
-
Stress, MPa
- \({\bar \sigma _c}\) :
-
Bond normal strength, MPa
- σ f :
-
Strength of surrounding rock reaches peak stress, MPa
- σ j :
-
Joint normal stress, MPa
- \({\bar \tau _c}\) :
-
Bond shear strength, MPa
- τ j :
-
Joint shear stress, MPa
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Huang, D., Li, Xq. & Song, Wc. Damage Evolution and Integrity Assessment of Jointed Rock Mass Based on Synthetic Rock Mass Approach. KSCE J Civ Eng 27, 2235–2247 (2023). https://doi.org/10.1007/s12205-023-1553-3
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DOI: https://doi.org/10.1007/s12205-023-1553-3