A new semi-numerical method for elastoplastic analysis of a circular tunnel excavated in a Hoek–Brown strain-softening rock mass considering the blast-induced damaged zone

2020 ◽  
Vol 122 ◽  
pp. 103476 ◽  
Author(s):  
Mohammad Reza Zareifard
Keyword(s):  
Rock Mass ◽  
Numerical Method ◽  
Strain Softening ◽  
Elastoplastic Analysis ◽  
Circular Tunnel ◽  
Damaged Zone

scholarly journals An Improved Stress and Strain Increment Approaches for Circular Tunnel in Strain-Softening Surrounding Rock Considering Seepage Force

2019 ◽  
Vol 2019 ◽  
pp. 1-17 ◽  
Author(s):  
Ling Wang ◽  
Jin-feng Zou ◽  
Yu-ming Sheng
Keyword(s):  
Rock Mass ◽  
Plastic Zone ◽  
Radial Displacement ◽  
Axisymmetric Problem ◽  
Strain Softening ◽  
Strain Increment ◽  
Surrounding Rock ◽  
Stress And Strain ◽  
Seepage Force ◽  
Circular Tunnel

Considering the effect of seepage force, a dimensionless approach was introduced to improve the stress and strain increment approach on the stresses and radial displacement around a circular tunnel excavated in a strain-softening generalized Hoek–Brown or Mohr–Coulomb rock mass. The circular tunnel can be simplified as axisymmetric problem, and the plastic zone was divided into a finite number of concentric rings which satisfy the equilibrium and compatibility equations. Increments of stresses and strains for each ring were obtained by solving the equilibrium and compatibility equations. Then, the stresses and displacements in softening zone can be calculated. The correctness and reliability of the proposed approach were performed by the existing solutions.

Prediction of critical strains and critical support pressures for circular tunnel excavated in strain-softening rock mass

2017 ◽  
Vol 224 ◽  
pp. 43-61 ◽  
Author(s):  
Lan Cui ◽  
Jun-Jie Zheng ◽  
You-Kou Dong ◽  
Biao Zhang ◽  
An Wang
Keyword(s):  
Rock Mass ◽  
Strain Softening ◽  
Circular Tunnel ◽  
Critical Strains

The Improvement of Deformation Analysis for Circular Tunnel Based on Hoek-Brown Criterion in Strain-Softening Rock Mass

2017 ◽  
Vol 1142 ◽  
pp. 344-348 ◽  
Author(s):  
Jian Xin Han ◽  
Lei Wang ◽  
Bei Jiang ◽  
Chun Mei Zheng
Keyword(s):  
Rock Mass ◽  
Radial Displacement ◽  
Strain Softening ◽  
Yield Criterion ◽  
A Priori ◽  
Deformation Analysis ◽  
Support Pressure ◽  
Circular Tunnel ◽  
Perfectly Plastic ◽  
The Difference

To overcome the defect that the support pressure is required to be measured or supposed in elasto-plastic analysis in strain-softening rock mass, by the connection of the support pressure imposed on surrounding rock mass, without assuming the support pressure is known a priori, an improved model of solving plastic radius and the distribution of radial displacement around the circular tunnel is proposed. Based on Hoek-Brown yield criterion, the results obtained by strain-softening model are compared with those of elastic perfectly brittle and elastic perfectly plastic models. The examples reveal that the difference of plastic radius obtained by the three models is comparatively smaller, but the difference of radial displacement is comparatively larger. The proposed model overcomes some defects of the previous studies in deformation analysis for tunnel.

A numerical solution of a circular tunnel in a confining pressure-dependent strain-softening rock mass

2020 ◽  
Vol 121 ◽  
pp. 103473 ◽  
Author(s):  
Qiang Zhang ◽  
Xiao-Wei Quan ◽  
Hong-Ying Wang ◽  
Bin-Song Jiang ◽  
Ri-Cheng Liu
Keyword(s):  
Rock Mass ◽  
Numerical Solution ◽  
Strain Softening ◽  
Confining Pressure ◽  
Circular Tunnel ◽  
Dependent Strain
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