Experimental Investigation on Strength and Failure Behavior of Pre-cracked Marble Under Conventional Triaxial Compression

2015 ◽  
pp. 185-216 ◽  
Author(s):  
Sheng-Qi Yang
Keyword(s):  
Experimental Investigation ◽  
Triaxial Compression ◽  
Failure Behavior ◽  
Conventional Triaxial Compression

Mechanical and cracking behavior of granite containing two coplanar flaws under conventional triaxial compression

2018 ◽  
Vol 28 (4) ◽  
pp. 590-610 ◽  
Author(s):  
Yan-Hua Huang ◽  
Sheng-Qi Yang
Keyword(s):  
Triaxial Compression ◽  
Three Dimensional ◽  
Damage Threshold ◽  
Confining Pressure ◽  
Crack Coalescence ◽  
Failure Behavior ◽  
Shear Cracks ◽  
Cracking Behavior ◽  
Conventional Triaxial Compression ◽  
Triaxial Compressive Strength

Flaws widely exist in rock mass, which significantly influences the strength and failure behavior of rock. The study of the flaw effect on the mechanical and cracking behavior is important to predict the unstable failure of fractured rock engineering. However, three-dimensional crack propagation behavior of real rock containing preexisting flaws under triaxial compression has been rarely studied. To increase the understanding of crack coalescence behavior, a series of laboratory conventional triaxial compression experiments were carried out on granite specimens containing two coplanar three-dimensional flaws. On the basis of experimental results, the effects of flaw angle and confining pressure on the strength properties of granite specimens were analyzed. As the flaw angle increased from 30° to 60° and the confining pressure increased from 0 to 30 MPa, the triaxial compressive strength and crack damage threshold of granite specimen increased. The cohesion and internal friction angle of preflawed granite specimen increased with increasing flaw angle. And then, X-ray micro-CT scanning technique was used to investigate the internal fracture characteristic of granite specimen. Four typical crack coalescence modes were identified in this experiment, i.e. no coalescence, two types of indirect coalescence, and shear coalescence. Under uniaxial compression, cracks from the tips of the flaws led to the specimen failure under tension, while under higher confining pressure, shear cracks and antiwing cracks were dominant.

Determination of plane-strain shear strength of sand from the results of triaxial tests

2001 ◽  
Vol 38 (6) ◽  
pp. 1231-1240 ◽  
Author(s):  
Adel Hanna
Keyword(s):  
Experimental Investigation ◽  
Shear Strength ◽  
Plane Strain ◽  
Soil Mechanics ◽  
Triaxial Compression ◽  
Triaxial Tests ◽  
Test Results ◽  
Shearing Resistance ◽  
Conventional Triaxial Compression ◽  
Strain Testing

Experimental investigation of the shear strength of dry sands was carried out using triaxial and plane-strain apparatus. The results were used to evaluate Rowe's stress–dilatancy theory, the relationships between the shear strength components due to friction and interlocking, and the volume-change characteristics for cases of plane-strain and axisymmetric boundary conditions. Because of the complexity of the plane-strain testing apparatus in the normal soil mechanics laboratory and the difficulties involved in performing this type of shear test, it is becoming costly to obtain plane-strain test results for consulting purposes. Based on Rowe's stress–dilatancy theory, the results of the present investigation, and the available test results in the literature, two simple methods are proposed to predict the angle of shearing resistance for plane-strain conditions from the results of the conventional triaxial compression tests.Key words: shear strength, plane-strain test, triaxial test, sand, experimental investigation, geotechnical engineering.

A new nonlinear empirical strength criterion for rocks under conventional triaxial compression

2021 ◽  
Vol 28 (5) ◽  
pp. 1448-1458
Author(s):  
Shi-jie Xie ◽  
Hang Lin ◽  
Yi-fan Chen ◽  
Yi-xian Wang
Keyword(s):  
Triaxial Compression ◽  
Strength Criterion ◽  
Conventional Triaxial Compression
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