Analysis of crack coalescence in rock-like materials containing three flaws—Part II: numerical approach

Tang, Chun An; Lin, Peng; Wong, Ryc; Chau, Kam Tim

doi:10.1016/s1365-1609(01)00065-x

Cited by 263 publications

(87 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Wong et al [21], Tang and Kou [22], and Tang et al [23] performed uniaxial and biaxial compression on numerical model samples containing a number of large, preexisting flaws and a row of suitably oriented smaller flaws by RFPA2D software, which shows that the crack growth is stable and stops at some finite crack length with the increase of lateral pressure, while a lateral tensile stress with even a small value will result in an unstable crack growth after a critical crack length is attained. Yang and Jing [14] It was found that the uniaxial compressive strength, Young's modulus, and peak axial strain of sandstone samples with preexisting single fissure are all lower than those of intact sandstone sample, which is closely related to the fissure length and fissure angle.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Research on Crack Process of Gypsum Containing Single Flaw with Different Angle and Length in Uniaxial Loading

Dai

Zhang

2018

Shock and Vibration

View full text Add to dashboard Cite

To investigate the crack behaviour of rock or rock-like material in uniaxial loading, a series of numerical simulations were conducted on gypsum specimens containing a single flaw with different inclination angle (0 ∘ -90 ∘ ) and length (10 mm-30 mm). Based on the numerical simulations results, the effect of flaw length on peak strength, the CI stress, and the CD stress were investigated with different inclination angles. The results show that the peak strength decreased initially and then increased with increasing of the flaw angle. Meanwhile, the peak strength decreased gradually when the length of the preexisting flaw increased. When the inclination angle was 30 ∘ , 45 ∘ , and 60 ∘ , the reduction degree of peak strength increased with increasing of the flaw length. The CI stress and CD stress not only depend on the inclination angle but also depend on flaw length. Four types of crack were observed in numerical simulations. The present research facilitates increased understanding of crack behaviour of rock under different conditions.

show abstract

Section: Introductionmentioning

confidence: 99%

A Numerical Research on Crack Process of Gypsum Containing Single Flaw with Different Angle and Length in Uniaxial Loading

Dai

Zhang

2018

Shock and Vibration

View full text Add to dashboard Cite

show abstract

“…Later, Hoek et al found that there exists a critical orientation of the inclined crack under compression, in which the pressure required for crack propagation is at its minimum [7]. Then, scholars developed a number of rock models containing single joints [8,9], two joints [10,11] and three joints [12,13], to study the initiation, the propagation and the coalescence of joints. The mechanical properties of jointed rock masses under different loading conditions were also studied, such as uniaxial compression [8], biaxial compression [14], triaxial compression [15] and direct shear test [16].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Joint Dip Angle on the Mechanical Behavior of Infilled Jointed Rock Masses under Uniaxial and Biaxial Compressions

et al. 2018

View full text Add to dashboard Cite

Due to the complex formation process of a rock mass, a large number of fissures, joints, faults, other defects exist and the defects commonly contain infilled materials. The jointed rock masses are in a complex geological environment, in which the geometric distribution and the boundary condition can greatly affect the mechanical behavior of the infilled jointed rock mass. In this study, the infilled jointed rock mass specimens with different dip angles are prepared using similar materials, and the uniaxial and biaxial compression tests on the specimens are conducted. The effect of the joint dip angle on the mechanical behavior of the infilled jointed rock mass under uniaxial and biaxial compressions is investigated. The results show that the uniaxial compressive strength shows a W-shaped variation, and the biaxial compressive strength shows a V-shaped variation with an increase in the dip angle. Most of the cracks appear in pairs around the joint and occur symmetrically in a bilateral distribution, and the existence of the infilled joints induces a nonlinear mechanical behavior in the specimen. In addition, the specimens exhibit three failure modes under uniaxial compression: splitting failure, step-path failure and planar failure. The specimens present two failure modes under biaxial compression: splitting failure and planar failure.

show abstract

“…e discontinuities such as joints, faults, and bedding planes in the natural rock mass greatly weaken the stability of the rock mass [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study on Mechanical Behavior of Parallel Joint Specimens under Compression Shear

Wang

Cao

Chen

et al. 2018

Advances in Civil Engineering

View full text Add to dashboard Cite

In order to investigate the influence of the joint on the failure mode, peak shear strength, and shear stress-strain curve of rock mass, the compression shear test loading on the parallel jointed specimens was carried out, and the acoustic emission system was used to monitor the loading process. e joint spacing and joint overlap were varied to alter the relative positions of parallel joints in geometry. Under compression-shear loading, the failure mode of the joint specimen can be classified into four types: coplanar shear failure, shear failure along the joint plane, shear failure along the shear stress plane, and similar integrity shear failure. e joint dip angle has a decisive effect on the failure mode of the specimen. e joint overlap affects the crack development of the specimen but does not change the failure mode of the specimen. e joint spacing can change the failure mode of the specimen. e shear strength of the specimen firstly increases and then decreases with the increase of the dip angle and reaches the maximum at 45°. e shear strength decreases with the increase of the joint overlap and increases with the increase of the joint spacing. e shear stress-displacement curves of different joint inclination samples have differences which mainly reflect in the postrupture stage. From monitoring results of the AE system, the variation regular of the AE count corresponds to the failure mode, and the peak value of the AE count decreases with the increase of joint overlap and increases with the increase of joint spacing.

show abstract

Analysis of crack coalescence in rock-like materials containing three flaws—Part II: numerical approach

Cited by 263 publications

References 24 publications

A Numerical Research on Crack Process of Gypsum Containing Single Flaw with Different Angle and Length in Uniaxial Loading

A Numerical Research on Crack Process of Gypsum Containing Single Flaw with Different Angle and Length in Uniaxial Loading

The Effect of Joint Dip Angle on the Mechanical Behavior of Infilled Jointed Rock Masses under Uniaxial and Biaxial Compressions

An Experimental Study on Mechanical Behavior of Parallel Joint Specimens under Compression Shear

Contact Info

Product

Resources

About