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The Mechanism of Stick–Slip as a Rockburst Source in Jointed Rockmass: An Experimental Study
https://orcid.org/0000-0002-2367-170X
Abstract The structural plane has a significant impact on the occurrence of seismic events related to rockburst in underground engineering. To investigate the mechanism of seismic events related to smooth joint, a series of complete and systematic biaxial shearing experiments were performed on a saw-cut bare interface to investigate the instability behaviors under different stress paths. Results indicate that dynamic stick–slip can be a dominant behavior of smooth joint during both loading and unloading processes and the stick–slip behaviors are similar to field seismic events to some extent. Therefore, stick–slip can be considered a viable mechanism for field seismic events associated with smooth joint. Further analysis indicates that the stress paths strikingly affect the sliding mode and intensity of stick–slip events. In detail, loading-caused stick–slip can induce synchronous and rapid slip of the rockmass, while unloading-caused stick–slip only induces local micro-slip and deformation. As a result, the normalized stress drop induced by loading-caused stick–slip is about 40% bigger than the result of unloading-caused stick–slip. Systematic analysis indicates that higher stress and lower loading/unloading rates can result in more intense stick–slip; in particular, the stress drops scale logarithmically with loading/unloading rate. The stick–slip resembles a shear failure in that it releases strain energy in the form of stress pulse with high frequency (up to 90 kHz) and short wavelength (a few centimeters). The findings provide a basis for understanding the mechanism of seismic events and rockburst associated with smooth joints.
Highlights Dynamic stick–slip can be a dominant behavior of smooth joint under shear conditions.Two kinds of stick–slip are distinguished and their generative mechanism is revealed.The influences of stress and loading/unloading rate on both loading and unloading-caused stick–slip are analyzed systematically.Similarities between stick–slip and field seismic events are analyzed.
The Mechanism of Stick–Slip as a Rockburst Source in Jointed Rockmass: An Experimental Study
https://orcid.org/0000-0002-2367-170X
Abstract The structural plane has a significant impact on the occurrence of seismic events related to rockburst in underground engineering. To investigate the mechanism of seismic events related to smooth joint, a series of complete and systematic biaxial shearing experiments were performed on a saw-cut bare interface to investigate the instability behaviors under different stress paths. Results indicate that dynamic stick–slip can be a dominant behavior of smooth joint during both loading and unloading processes and the stick–slip behaviors are similar to field seismic events to some extent. Therefore, stick–slip can be considered a viable mechanism for field seismic events associated with smooth joint. Further analysis indicates that the stress paths strikingly affect the sliding mode and intensity of stick–slip events. In detail, loading-caused stick–slip can induce synchronous and rapid slip of the rockmass, while unloading-caused stick–slip only induces local micro-slip and deformation. As a result, the normalized stress drop induced by loading-caused stick–slip is about 40% bigger than the result of unloading-caused stick–slip. Systematic analysis indicates that higher stress and lower loading/unloading rates can result in more intense stick–slip; in particular, the stress drops scale logarithmically with loading/unloading rate. The stick–slip resembles a shear failure in that it releases strain energy in the form of stress pulse with high frequency (up to 90 kHz) and short wavelength (a few centimeters). The findings provide a basis for understanding the mechanism of seismic events and rockburst associated with smooth joints.
Highlights Dynamic stick–slip can be a dominant behavior of smooth joint under shear conditions.Two kinds of stick–slip are distinguished and their generative mechanism is revealed.The influences of stress and loading/unloading rate on both loading and unloading-caused stick–slip are analyzed systematically.Similarities between stick–slip and field seismic events are analyzed.
The Mechanism of Stick–Slip as a Rockburst Source in Jointed Rockmass: An Experimental Study
https://orcid.org/0000-0002-2367-170X
Abstract The structural plane has a significant impact on the occurrence of seismic events related to rockburst in underground engineering. To investigate the mechanism of seismic events related to smooth joint, a series of complete and systematic biaxial shearing experiments were performed on a saw-cut bare interface to investigate the instability behaviors under different stress paths. Results indicate that dynamic stick–slip can be a dominant behavior of smooth joint during both loading and unloading processes and the stick–slip behaviors are similar to field seismic events to some extent. Therefore, stick–slip can be considered a viable mechanism for field seismic events associated with smooth joint. Further analysis indicates that the stress paths strikingly affect the sliding mode and intensity of stick–slip events. In detail, loading-caused stick–slip can induce synchronous and rapid slip of the rockmass, while unloading-caused stick–slip only induces local micro-slip and deformation. As a result, the normalized stress drop induced by loading-caused stick–slip is about 40% bigger than the result of unloading-caused stick–slip. Systematic analysis indicates that higher stress and lower loading/unloading rates can result in more intense stick–slip; in particular, the stress drops scale logarithmically with loading/unloading rate. The stick–slip resembles a shear failure in that it releases strain energy in the form of stress pulse with high frequency (up to 90 kHz) and short wavelength (a few centimeters). The findings provide a basis for understanding the mechanism of seismic events and rockburst associated with smooth joints.
Highlights Dynamic stick–slip can be a dominant behavior of smooth joint under shear conditions.Two kinds of stick–slip are distinguished and their generative mechanism is revealed.The influences of stress and loading/unloading rate on both loading and unloading-caused stick–slip are analyzed systematically.Similarities between stick–slip and field seismic events are analyzed.
The Mechanism of Stick–Slip as a Rockburst Source in Jointed Rockmass: An Experimental Study
Yao, Zhigang (author) / Fang, Yong (author) / Zhang, Rui (author) / Pu, Song (author) / Zhao, Guangming (author) / Yu, Tao (author) / Ma, Chunchi (author)
2023
Article (Journal)
Electronic Resource
English
BKL:
38.58
Geomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
38.58$jGeomechanik
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB41
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