scholarly journals Elastic and plastic-flow damage constitutive model of rock based on conventional triaxial compression test

2018 ◽  
Vol 36 (3) ◽  
pp. 927-935
Author(s):  
Pingyuan Yang ◽  
Xiaoen Wu ◽  
Junhua Chen
Keyword(s):  
Constitutive Model ◽  
Plastic Flow ◽  
Compression Test ◽  
Triaxial Compression ◽  
Triaxial Compression Test ◽  
Conventional Triaxial Compression ◽  
Damage Constitutive Model

Statistical damage model with strain softening and hardening for rocks under the influence of voids and volume changes

2010 ◽  
Vol 47 (8) ◽  
pp. 857-871 ◽  
Author(s):  
Wen-Gui Cao ◽  
Heng Zhao ◽  
Xiang Li ◽  
Yong-Jie Zhang
Keyword(s):  
Constitutive Model ◽  
Strain Softening ◽  
Triaxial Compression ◽  
Damage Model ◽  
Damage Threshold ◽  
Model Parameters ◽  
Volume Changes ◽  
Conventional Triaxial Compression ◽  
Damage Constitutive Model ◽  
Statistical Damage

With regards to the composition of natural rocks including voids or pores, deformation behavior is strongly affected by variation in porosity. By using a statistical damage-based approach, the characteristics of strain softening and hardening under the influence of voids and volume changes are investigated in the present paper. Suppose that a rock consists of three parts: voids, a damaged part, and an undamaged part. The effects of voids and volume changes on rock behavior are first analyzed through determination of the porosity and an associated damage model is then developed. Later, a statistical evolution equation describing the influence of the damage threshold on the propagation condition of rock damage is formulated based on measurement of the mesoscopic element strength. A statistical damage constitutive model reflecting strain softening and hardening behavior for rocks loaded in conventional triaxial compression is further developed and a corresponding method for determining the model parameters is also provided. Theoretical results of this proposed model are then compared with those observed experimentally. Finally, several aspects of the present constitutive model, which affect the relevant behavior of rocks, are particularly discussed.

An alternative to the conventional triaxial compression test

2006 ◽  
Vol 161 (3) ◽  
pp. 220-226 ◽  
Author(s):  
M.S. Nielsen ◽  
N. Bay ◽  
M. Eriksen ◽  
J.I. Bech ◽  
M.H. Hancock
Keyword(s):  
Compression Test ◽  
Triaxial Compression ◽  
Triaxial Compression Test ◽  
Conventional Triaxial Compression

scholarly journals Triaxial Permeability Experimental Study on Deformation and Failure Processes of Single-Fractured Rock Specimens

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Taoli Xiao ◽  
Mei Huang ◽  
Min Gao
Keyword(s):  
Compression Test ◽  
Failure Modes ◽  
Triaxial Compression ◽  
Testing Machine ◽  
Peak Stress ◽  
Triaxial Compression Test ◽  
Permeability Test ◽  
Deformation And Failure ◽  
Seepage Pressure ◽  
Conventional Triaxial Compression

A series of rock-like specimens with specific sizes and fracture inclinations was created in the laboratory. The different effects of seepage pressure on the deformation and failure characteristics between a conventional triaxial compression test and a triaxial permeability test were studied using a servo-controlled testing machine. Furthermore, the change in the permeability of single-fractured specimens was explored based on a triaxial permeability test. The results were as follows. Compared with those observed in the conventional triaxial compression test, the peak stress and corresponding axial strain decrease under seepage pressure in the triaxial permeability test, while the deformation modulus increased. With the increase of fracture length, the peak stress of specimen decreases due to the seepage pressure and the specimen showed tensile failure horizontally. The failure mode of the single-fractured specimens was changed by the seepage pressure. A closed relationship was observed between the failure modes and the permeability-stress curves. A shear failure along the crack surface will occur when the permeability abruptly changed later than the peak stress point. The dramatic change in the permeability indicated that the permeability channel was extended or new seepage paths were created. These conclusions can provide a valuable theoretical reference for the numerical simulation of excavation and design in stability analysis of jointed rock masses.

Shearing characteristics of SCP-inserted clay specimens in triaxial compression test

2015 ◽  
Vol 11 (1) ◽  
pp. 209-219 ◽  
Author(s):  
Yoon-Sik Choo ◽  
Wanjei Cho ◽  
Choong-Ki Chung
Keyword(s):  
Compression Test ◽  
Triaxial Compression ◽  
Triaxial Compression Test
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