Analysis of rockburst mechanisms induced by structural planes in deep tunnels

Zhou, Hui; Meng, Fanzhen; Zhang, Chuanqing; Hu, Dawei; Yang, Fanjie; Lu, Jingjing

doi:10.1007/s10064-014-0696-3

Cited by 153 publications

(69 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The rockburst intensity in a tunnel can be described by the morphological characteristics of the burst surface, the depth and width of fracturing, and the acoustic features [33]. The final fracturing morphology of different horizontal stresses can be seen in Figure 6.…”

Section: Relationship Between Horizontal Stress and Rockburstmentioning

confidence: 99%

The Mechanical and Fracturing of Rockburst in Tunnel and Its Acoustic Emission Characteristics

Liu

Zhan

Zhang

et al. 2018

Shock and Vibration

View full text Add to dashboard Cite

The phenomenon of acoustic emission (AE) is associated with rock failure and rock fracturing. In order to investigate the influence of tectonic stress on rockburst in tunnel, a biaxial loading experiment system was used in this study. The excavation operation is undertaken at the center of samples to monitor the tunnel forming process in situ, and the different horizontal stresses can be studied by using the AE monitoring technique. The dynamical fracturing process of the tunnel model was summarized, and the timing parameters of AE signals in rockburst stages were obtained. The curves of AE energy and cumulative AE energy with time show a "step-like" rising trend before the occurrence of rockburst. The evolution of macro-and mesocracks is captured, and the mechanical conditions for a "V-shaped" rockburst pit are derived. As the horizontal stress increases, the effect of excavation unloading becomes more pronounced, and the damage caused by the rockburst intensifies. In the early stage of rockburst evolution, the fracturing type follows a model of tensile-shear mix model. A positive relationship between the ratio of shear fracturing type and the horizontal stress can be noted when the rock is about to burst, and the high intensity and the high energy released of from the rock-fracturing event have become evident. Thus, the results indicate that one should focus on monitoring both sides of the surrounding rock of the tunnel so as to extract the characteristics of the process of tunnel in tunnel. The applications of biaxial loading system and during an excavation operation provide a useful tool to simulate the rock burst in tunnel at an engineering site.

show abstract

Section: Relationship Between Horizontal Stress and Rockburstmentioning

confidence: 99%

The Mechanical and Fracturing of Rockburst in Tunnel and Its Acoustic Emission Characteristics

Liu

Zhan

Zhang

et al. 2018

Shock and Vibration

View full text Add to dashboard Cite

show abstract

“…Scholars have reached a consensus that the layer-crack structure makes an essential contribution to rib spalling or rock burst in brittle coal or rock mass [13,[34][35][36][37][38][39]. Figure 9 illustrates the general occurrence mechanism of rock burst related to the layer-crack strucutre.…”

Section: Discussionmentioning

confidence: 99%

Influence of Fissure Number on the Mechanical Properties of Layer‐Crack Rock Models under Uniaxial Compression

Tan

Guo

Zhao

et al. 2018

Advances in Civil Engineering

View full text Add to dashboard Cite

Many case studies have revealed that rock bursts generally occur in the high stress concentration area where layer-crack structures often exist, especially for brittle coal or rock masses. Understanding the mechanical properties of layer-crack rock models is beneficial for rational design and stability analysis of rock engineering project and rock burst prevention. This study experimentally investigated the influence of fissure number on the mechanical properties of layer-crack rock models through uniaxial compression tests. The digital speckle correlation method (DSCM) and acoustic emission (AE) techniques were applied to record and analyze the information of deformation and failure processes. Test results show the following: the bearing capacity of layer-crack specimen decreases compared with intact specimen, but their failure modes are similar, which are the splitting failure accompanied with local shear failure; the nonuniform deformation phenomenon begins to appear at the elastic deformation stage for layer-crack specimens; the AE behavior of intact specimens consists of three stages, that is, active stage, quiet stage, and major active stage, but for layer-crack specimens, it is characteristic by three peaks without quiet stage. In addition, as the fissure number of layer-crack specimens increases, the bearing capacity of specimens decreases, the appearing time of nonuniform deformation phenomenon in the specimen surface decreases, the AE events are denser and denser in each peak stage, and the risk of dynamic instability of layer-crack structure increases. At last, the failure mechanism of layer-crack structure and the related mitigation advices were discussed based on the test results. In general, the novelty is that this paper focuses on the failure mechanism of layer-crack structure directly.

show abstract

“…e fully bonded bolt and the prestressed bolt are the most widely used rock bolts in civil and mining engineering due to their effectiveness and applicability. In recent years, new types of rock bolts, such as the cone bolt [2,3], the Durabar [4], the D-bolt [5][6][7], and other energy-absorbing bolts [8,9], have been developed to solve the issue of rock burst, which usually cause serious damage to on-site construction and pose a considerable threat to on-site workers in deep rock engineering because of the great amount of energy release [10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Anchoring Effect of Two Different Types of Rock Bolts on Fractured Rock

Zhou

2019

Advances in Materials Science and Engineering

Self Cite

View full text Add to dashboard Cite

A deep understanding of the anchoring effect of rock bolts on fractured rock is essential for support design in rock engineering. In this paper, cubic specimens containing a single preexisting flaw with different inclination angles were made by high-strength gypsum; uniaxial compression tests were conducted on bolted and unbolted specimens to study the anchoring effect of the fully bonded bolt and the prestressed bolt on fractured rock. The mechanical parameters and failure characteristics of bolted and unbolted specimens were compared and analyzed in detail. The results indicated that both the prestressed and fully bonded bolt had a significant influence on the mechanical behavior of fractured rock. The average value of E, σi, σp, and σr of bolted specimens all increased due to the effect of the rock bolt. The increase degree was the greatest for the specimens with flaw inclination angle of 45°. The increase in residual strength, σr, was the most significant among all the mechanical parameters. The mechanical parameters of specimens anchored with a prestressed bolt increased with an increase in pretension stress. Besides, the reinforcement effect of the two types of rock bolts was different for different mechanical parameters. The bolted specimens displayed different failure characteristics compared to the unbolted specimens. Variation of tension stress in the prestressed bolt during the loading process was divided into three different stages. With an increase in the inclination angle from 30° to 60°, the peak tension stress value first increased and then decreased and obtained the maximum value at inclination angle of 45°. Besides, the peak tension stress value increased with pretension stress.

show abstract

Analysis of rockburst mechanisms induced by structural planes in deep tunnels

Cited by 153 publications

References 24 publications

The Mechanical and Fracturing of Rockburst in Tunnel and Its Acoustic Emission Characteristics

The Mechanical and Fracturing of Rockburst in Tunnel and Its Acoustic Emission Characteristics

Influence of Fissure Number on the Mechanical Properties of Layer‐Crack Rock Models under Uniaxial Compression

Experimental Investigation of the Anchoring Effect of Two Different Types of Rock Bolts on Fractured Rock

Contact Info

Product

Resources

About