Back Analysis Methods in Geotechnical Engineering

2014 ◽  
Vol 1020 ◽  
pp. 423-428 ◽  
Author(s):  
Eva Hrubesova ◽  
Marek Mohyla
Keyword(s):  
Rock Mass ◽  
Geotechnical Engineering ◽  
Back Analysis ◽  
Rheological Parameters ◽  
Analysis Method ◽  
Direct Optimization ◽  
Initial Stress State ◽  
Analytical Functions ◽  
Is Evaluation

The paper deals with the back analysis method in geotechnical engineering, that goal is evaluation the more objective and reliable parameters of the rock mass on the basis of in-situ measurements. Stress, deformational, strength and rheological parameters of the rock mass are usually determined by some inaccuracies and errors arising from the complexity and variability of the rock mass. This higher or lower degree of imprecision is reflected in the reliability of the mathematical modelling results. The paper presents the utilization of direct optimization back analysis method, based on the theory of analytical functions of complex variable and Kolosov-Muschelischvili relations, to the evaluation of initial stress state inside the rock massif.

Study on Deformation and Damage of Rock Mass Subject to High In Situ Stress by Using a Elastoplastic Damage Model and Considering the Impact of Weak Planes

2013 ◽  
Vol 838-841 ◽  
pp. 705-709
Author(s):  
Yun Hao Yang ◽  
Ren Kun Wang
Keyword(s):  
Rock Mass ◽  
Large Scale ◽  
Damage Model ◽  
Back Analysis ◽  
In Situ Stress ◽  
Surrounding Rock ◽  
High In Situ Stress ◽  
Underground Caverns ◽  
The Impact

Large scale underground caverns are under construction in high in-situ stress field at Houziyan hydropower station. To investigate deformation and damage of surrounding rock mass, a elastoplastic orthotropic damage model capable of describing induced orthotropic damage and post-peak behavior of hard rock is used, together with a effective approach accounting for the presence of weak planes. Then a displacement based back analysis was conducted by using the measured deformation data from extensometers. The computed displacements are in good agreement with the measured ones at most of measurement points, which confirm the validities of constitutive model and numerical simulation model. The result of simulation shows that damage of surrounding rock mass is mainly dominated by the high in-situ stress rather than the weak planes and heavy damage occur at the cavern shoulders and side walls.

Study on Refined Back-Analysis Method for Stress Field Based on In Situ and Disturbed Stresses

2021 ◽  
Vol 21 (8) ◽  
pp. 04021141
Author(s):  
Changyu Jin ◽  
Yu Lu ◽  
Tao Han ◽  
Tianyu Chen ◽  
Jianxin Cui ◽  
...  
Keyword(s):  
Stress Field ◽  
Back Analysis ◽  
Analysis Method

scholarly journals Evaluation of shear behavior of in-situ rock mass by numerical simulation using discontinuous analysis method.

2001 ◽  
pp. 83-96
Author(s):  
Kouji IKUSADA ◽  
Tatsuru MIZOKAMI ◽  
Mitsuo NAKAGAWA ◽  
Yujing JIANG ◽  
Tetsuro ESAKI
Keyword(s):  
Numerical Simulation ◽  
Rock Mass ◽  
Shear Behavior ◽  
Analysis Method

scholarly journals Rheological Behavior of Rockmass Supported with Rockbolts Based on Viscoelastic Analysis Method

Mathematics ◽  
2018 ◽  
Vol 6 (10) ◽  
pp. 199
Author(s):  
Gang Wang ◽  
Wei Han ◽  
Chuanzheng Liu ◽  
Ke Wang ◽  
Hengjie Luan
Keyword(s):  
Rock Mass ◽  
Analytical Solutions ◽  
Rheological Behavior ◽  
Rheological Model ◽  
Coupling Model ◽  
Rheological Parameters ◽  
Analysis Method ◽  
Viscosity Coefficients ◽  
Viscoelastic Analysis ◽  
Close Relationship

In this paper, we present the viscoelastic solutions for rockmass supported with discretely mechanically or frictionally coupled (DMFC) rockbolts to reveal the coupling rheological mechanisms. The analytical solutions are first acquired by applying the Laplace inverse transforms. The effect of different viscosity coefficients and supporting parameters on the coupling model rheological behavior are then investigated. It is concluded that the variation of the rockbolt axial force or rock mass stress and displacement have a close relationship with rheological parameters and support parameters. In addition, the variations of mechanical states of rockbolts and rock mass are closely related to the rheological model.

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