Failure in rock with intersecting rough joints under uniaxial compression

Liu, Xige; Zhu, Wancheng; Zhang, Penghai; Li, Lankun

doi:10.1016/j.ijrmms.2021.104832

Cited by 23 publications

(4 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The severity of the damage is reflected by the AE magnitude. The magnitude during the failure process of jointed and bolted jointed specimens was calculated by the method described according to Liu et al (2021) (Figure 6). After anchorage, large-magnitude AE events during the compaction stage of jointed specimens became reduced.…”

Section: Ae Eventsmentioning

confidence: 99%

Experimental and Numerical Study on the Anchorage Effect of Bolted Jointed Rock Masses

et al. 2022

Self Cite

View full text Add to dashboard Cite

Anchor technology has become an irreplaceable geotechnical engineering reinforcement measure. To clarify anchorage effects and investigate the three-dimensional (3D) crack propagation process of bolted jointed rock masses, a series of physical model tests and 3D numerical simulations were performed, and optimal anchoring conditions of jointed rock masses are found. The results showed that a bolted jointed rock mass had stronger compressive performance and deformation capability, with crack propagation controlled, especially in the anchorage zone, and the formation and slip of shear zones also restrained. Meanwhile, the fractured location is transferred from the joint tip to the interface between the bolt and surrounding rock. The numerical simulation based on the damage model of rocks at the mesoscale and a nonlinear shearing–sliding model for anchoring interfaces were conducted with the FLAC3D code to reproduce the 3D crack propagation and the gradual damage of bolted jointed rock masses. The anchorage effect increased the crack initiation stress of jointed rock masses, but the zone where the bolt passed through the joint cracked more easily. Once onset of the instability stage of the bolted jointed rock mass, cracks began to propagate and penetrate gradually to the anchorage zone. In addition, under uniaxial compression, a “Z”-shaped shear stress concentration zone is observed in the bolt, which is mainly attributed to the role of the bolt on controlling shear failure along the joint plane and transverse dilatancy of the specimen. Better anchorage effects were achieved by installing bolts after deformation of the jointed rock mass had developed to a certain extent. The optimal anchor opportunity for a jointed rock mass varied with the joint angle. More specifically, for the rock mass with a joint angle of 75°, the anchorage effect was best when the bolt was installed at 40% peak strain of the jointed rock mass, while 10% peak strain was perfect for the bolted rock mass with a 45° joint angle.

show abstract

Section: Ae Eventsmentioning

confidence: 99%

Experimental and Numerical Study on the Anchorage Effect of Bolted Jointed Rock Masses

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…In the study of discreteness of rock experimental results, it is considered that the reason why the experimental results of the same rock sample show discreteness is that the rock is a complex natural structure with various tiny defects inside it 12 – 14 . The study of rock size effect is mostly from two aspects, one is from the experimental instruments and experimental methods.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of size effect of defective rock under compression condition

Xie

Qin

et al. 2023

Sci Rep

View full text Add to dashboard Cite

The existence of various types of damage, small cracks, some large voids and the size of the sample in the rock will make the experimental results show great discreteness. In this paper, based on the results of laboratory experiments, a numerical model of large flawed rock samples is established by using particle flow software PFC2D, and the mechanical response of rocks with different length-diameter ratios and different flaw positions in uniaxial compression experiments is discussed. The results show that the specimen size has a significant effect on the crack characteristics, mechanical characteristics and energy characteristics of rock mass. From the perspective of energy and crack characteristics, the total number of cracks after the failure of the defective rock sample is slightly lower than that of the intact rock sample, resulting in a slightly lower peak strain energy during the rock failure process. From the mechanical properties of rock samples, the Poisson’s ratio of intact rock samples is slightly smaller than that of defective rock samples. The strength of the defective sample is weakened relative to the complete rock sample, and the relationship formula between the weakening range and the aspect ratio is obtained through analysis. Moreover, different defect locations lead to different crack processes and crack modes, resulting in different uniaxial compressive strength.

show abstract

“…Regarding stability assessment of concrete dams, some dam design guidelines recommend simplified stability analysis procedures considering a zero cohesion and tensile strength interface model [29]. In fact, joints are the weakest region of the rock mass and the part most prone to failure [30]. However, the dam/foundation interface exhibits cohesion and tensile strength, which gradually decrease as sliding occurs [31,32].…”

Section: Introductionmentioning

confidence: 99%

Sliding Stability Assessment of Concrete Dams Using a 3D Discontinuum Hydromechanical Model Following a Discrete Crack Approach

et al. 2022

View full text Add to dashboard Cite

Evaluation of the sliding stability of concrete dams requires the use of numerical tools not only able to simulate the coupled hydromechanical behavior but also able to adequately represent the foundation discontinuities and the specific features of dam foundations. The formulation of a three-dimensional (3D) small displacement finite element model based on interface elements to simulate the discontinuities is presented. In this model, the hydraulic behavior is simulated assuming that the water flow occurs only along channels located at the edges of the triangular interface elements that simulate the discontinuities. The model is used to perform coupled hydromechanical analysis of a large arch-gravity dam and to assess safety against dam base sliding, assuming different constitutive models at the dam/foundation interface and two different approaches: (i) strength reduction method and (ii) amplification of the hydrostatic pressure, assuming an increase in the reservoir level. The present study shows that consistent results are obtained with the proposed numerical model and that stability analysis should preferably be carried out using the method of increasing the hydrostatic pressure and the corresponding uplift pressures, as this methodology leads to significantly lower safety factors.

show abstract

Failure in rock with intersecting rough joints under uniaxial compression

Cited by 23 publications

References 44 publications

Experimental and Numerical Study on the Anchorage Effect of Bolted Jointed Rock Masses

Experimental and Numerical Study on the Anchorage Effect of Bolted Jointed Rock Masses

Numerical simulation of size effect of defective rock under compression condition

Sliding Stability Assessment of Concrete Dams Using a 3D Discontinuum Hydromechanical Model Following a Discrete Crack Approach

Contact Info

Product

Resources

About