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Micro-mechanisms of temperature-dependent triaxial strength in Beishan granite and implications for high-level radioactive waste disposal. [PDF]

Sci Rep
Zeng W, Wu Y, Hu L, Li X, Huang Z, Zhao P, Lin J, Yu J.   +7 more
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Experimental study on the anisotropy of the effective stress coefficient of sandstone under true triaxial stress

Journal of Natural Gas Science and Engineering, 2020
Abstract The effective stress principle plays an important role in the study of the permeability evolution and mechanical behavior of coal and rocks. A key to evaluating the effective stress is determining the evolution of the effective stress coefficient α.
Beichen Yu, Dongming Zhang, Honggang Zhao   +2 more
exaly   +2 more sources

Permeability evolution of shale under anisotropic true triaxial stress conditions

International Journal of Coal Geology, 2016
Abstract Although permeability data for shale have been reported previously and permeability models have been proposed, studies on permeability for shale under anisotropic true triaxial stress conditions are lacking. In this work, the permeability of shale under true triaxial stress conditions was measured using a newly developed true triaxial ...
Minghui Li, Guangzhi Yin, Zhenlong Song   +2 more
exaly   +2 more sources

A True Triaxial Stress Cell to simulate deep downhole drilling conditions

The APPEA Journal, 2010
Conventional rock mechanics experiments using triaxial cells trying to simulate the true downhole stress field by applying equal horizontal stresses, fundamentally fail to treat real field borehole conditions as three independent stresses. In the real world, the horizontal stress field at shallow depth can have a different direction from that at ...
Rasouli, Vamegh, Evans, Brian
openaire   +3 more sources

Limiting envelopes of a porous limestone under true triaxial stress states

, 2010
The influence of the intermediate principal stress on the mechanical behavior of a porous limestone is investigated by means of true triaxial tests on dry samples. The limiting envelopes are built in octahedral planes and in the (P,Q) plane in order to give a good understanding of the three-dimensional surface.
Descamps, Fanny, Ramos da Silva, Mikael, Schroeder, Christian, Tshibangu, Katshidikaya, Verbrugge, Jean-Claude   +4 more
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Relaxation behaviour of Jinping marble under true triaxial stresses

International Journal of Rock Mechanics and Mining Sciences, 2022
Abstract After being excavated for a certain time, deeply buried rock mass is still likely to suffer time-dependent failure. Long-term time-dependent failure may lead to the stability failure of engineering structures. As a special case of time-dependent behaviour, the stress relaxation of hard rock be of great research significance.
Jun Zhao, Xia-Ting Feng, Chengxiang Yang, Benguo He, Mengfei Jiang   +4 more
openaire   +1 more source

On the determination of true stress triaxiality in sheet metal

Journal of Materials Processing Technology, 2007
Abstract Material ductility, or the failure strain, is generally characterized by simple tensile tests. However, tensile tests on sheet samples lead to higher strain gradients than those observed in axisymmetric samples, so the classical Bridgeman correction is invalid.
A. Bacha, D. Daniel, H. Klocker
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True Triaxial Experimental Study of Stress-Induced Anisotropy of Sand

Instrumentation, Testing, and Modeling of Soil and Rock Behavior, 2011
A true triaxial testing apparatus with rigid compound and sophisticated loading system was applied to carry out series of tests to study the stress-induced anisotropy of sand under three dimensional stress states. The additional loads were applied from σ1, σ2, and σ3 direction based on initial three dimensional complex stress states.
Kunyong Zhang, Jai K. Jung, Ting Zhang
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Hydraulic fracturing stress measurement using a true triaxial apparatus

International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 1997
Abstract Generally, from pressure-time curves obtained in underground hydralulic fracture tests one can determine the breakdown pressure Pc, the fracture reopening pressure Pr and the shut-in pressure Ps. These pressure values are then used for the calculation of the in situ stress state.
Sibai, M., Henry, J.P., Gros, J.C.
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Stress–strain behaviour of unsaturated soil in true triaxial tests

Canadian Geotechnical Journal, 2002
A suction-controlled true triaxial apparatus for unsaturated soil was developed from the existing true triaxial apparatus for sand by attaching a device to supply matric suction to specimens. Using the developed apparatus, true triaxial tests (σ1 [Formula: see text] σ2 [Formula: see text] σ3; where σ1, σ2, and σ3 are the three different principal ...
Hajime Matsuoka, De'an Sun, Akiteru Kogane, Nobuhiko Fukuzawa, Wataru Ichihara   +4 more
openaire   +1 more source