Rock fractures and in situ rock stress

2015 ◽  
pp. 133-160
Keyword(s):  
Rock Fractures ◽  
Rock Stress

Estimating in-situ rock stress from spalling veins: A case study

2013 ◽  
Vol 152 (1) ◽  
pp. 38-47 ◽  
Author(s):  
Quan Jiang ◽  
Xia-ting Feng ◽  
Jing Chen ◽  
Ke Huang ◽  
Ya-li Jiang
Keyword(s):  
Rock Stress

In situ rock stress measurements in Western Australia’s Yilgarn Craton

2006 ◽  
pp. 35-42 ◽  
Author(s):  
M Lee ◽  
L Mollison ◽  
P Mikula ◽  
M Pascoe
Keyword(s):  
Rock Stress ◽  
Yilgarn Craton ◽  
Stress Measurements

Variability of in situ rock stress

2010 ◽  
pp. 3-10 ◽  
Author(s):  
J Hudson ◽  
X Feng
Keyword(s):  
Rock Stress

A laboratory fracture shear cell used for simulation of fracture reactivation

2011 ◽  
Vol 51 (1) ◽  
pp. 487 ◽  
Author(s):  
Mohammad Sadegh Asadi ◽  
Vamegh Rasouli
Keyword(s):  
Significant Influence ◽  
Fault Reactivation ◽  
Shear Behaviour ◽  
Rock Fractures ◽  
Normal Stresses ◽  
Shear Tests ◽  
Shear Cell ◽  
In Situ Stresses ◽  
Wide Range

Fault reactivation is an unfavourable incident during drilling and production that may occur due to changes in situ stresses and reservoir pressure. Only a few studies, in their analyses, have included the effects of fault geometrical properties—these are important parameters controlling fault slippage and damage around it. In this paper, the significant influence of fracture morphology on the mechanical behaviour of rock fractures was investigated through experimental studies of shearing rock fractures in the lab. The experiments carried out using a fracture shear cell (FSC): the cell that was modified by adding a number of components to an existing true triaxial stress cell (TTSC) and designing a duplex high pressure cylinder that is capable of applying large normal stresses to the sample at a constant rate. A number of artificial blocks made of mortar material were subjected to shear tests using FSC under a wide range of normal stresses and at different shearing directions. The outputs of uniaxial compressive strength and fracture shear tests in the lab were used to plot the failure envelope of the fractured rock mass and discuss the failure mechanism through shearing. Accordingly, a calibrated, numerical discrete element method (DEM) was used to simulate the shear behaviour of fractures previously tested in the lab. The results of lab tests and DEM simulations will be presented and different failure mechanisms that are expected during shearing will be explained. The results show the significant influence of surface roughness on shear strength and extent of damage zone along the fracture. It was found that the shearing response of fractures depends on the magnitude of normal stress, which indicates the importance of having a good knowledge of in-situ stresses when modelling fault reactivation and damage near the fault zones. The results of lab experiments and numerical simulations were compared and good agreements were observed.

scholarly journals Analytical Solution of Tunnel Surrounding Rock for Stress and Displacement Based on Lade–Duncan Criterion

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
MingZheng Zhu ◽  
Yugui Yang ◽  
Feng Gao ◽  
Juan Liu
Keyword(s):  
Internal Friction ◽  
Plastic Zone ◽  
Yield Criterion ◽  
Surrounding Rock ◽  
Rock Stress ◽  
Deformation And Failure ◽  
Displacement Based ◽  
The Stability ◽  
Coulomb Criterion

The deformation and failure of tunnel surrounding rock is the result of tunnel excavation disturbance and rock stress release. When the local stress of surrounding rock exceeds the elastic limit of rock mass, the plastic analysis of surrounding rock must be carried out to judge the stability of tunnel. In this study, the Lade–Duncan yield criterion is used to calculate the analytic solutions for the surrounding rock in a tunnel, and the radius and displacement of the plastic zone are deduced using an equilibrium equation. The plastic zone radius and displacement based on Lade–Duncan criterion and Mohr–Coulomb criterion were compared by using single-factor analysis method under the different internal friction angles, in situ stresses, and support resistances. The results show that the solutions of the radius and displacement of plastic zone calculated by the Lade–Duncan criterion are close to those of Mohr–Coulomb criterion under the high internal friction angle and support resistance or low in situ rock stress; however, the radius and displacement of the plastic zone calculated by the Lade–Duncan criterion are larger under normal circumstances, and the Lade–Duncan criterion is more applicable to the stability analysis of the surrounding rock in a tunnel.

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