Seismological method for prediction of areal rockbursts in deep mine with seismic source mechanism and unstable failure theory

2010 ◽  
Vol 17 (5) ◽  
pp. 947-953 ◽  
Author(s):  
Li-zhong Tang ◽  
K. W. Xia
Keyword(s):  
Seismic Source ◽  
Source Mechanism ◽  
Deep Mine ◽  
Failure Theory ◽  
Unstable Failure ◽  
Seismic Source Mechanism

Evaluating seismic source mechanism with phasor analysis

2012 ◽  
Vol 2 (1) ◽  
pp. 3-7
Author(s):  
M. Hudyma ◽  
D. Beneteau ◽  
Y. Potvin
Keyword(s):  
Seismic Source ◽  
Source Mechanism ◽  
Seismic Source Mechanism ◽  
Phasor Analysis

Estimation of rockburst wall-rock velocity invoked by slab flexure sources in deep tunnels

2014 ◽  
Vol 51 (5) ◽  
pp. 520-539 ◽  
Author(s):  
Shili Qiu ◽  
Xiating Feng ◽  
Chuanqing Zhang ◽  
Tianbing Xiang
Keyword(s):  
Rock Mass ◽  
Seismic Source ◽  
Friction Angle ◽  
Wall Rock ◽  
Assessment Method ◽  
Source Mechanism ◽  
Uniaxial Tensile ◽  
Roughness Coefficient ◽  
Support Design ◽  
True Triaxial

For rock support in burst-prone ground, the wall-rock velocity adjacent to the surface of underground openings is a vital support design parameter, and depends on the seismic source mechanism inducing rockburst damage. In this study, to estimate the wall-rock velocity evoked only by rock slab buckling (an important rockburst source mechanism), a comprehensive velocity assessment method is proposed, using an excellent slab column buckling model with a small eccentricity, which relies on a novel compressive or tensile buckling failure criterion of rock slab. The true-triaxial loading–unloading tests and rockburst case analyses reveal that rock mass slabbing induced by high rock stress has major impacts on the evolution and formation of buckling rockburst in deep tunnels. Using a method based on the energy balance principle, the slabbing thickness of intact rock mass is also calculated by an analytical method, which indicates that the slabbing thickness parameter has a nonlinear relation to the following six parameters: uniaxial tensile strength (UTS), uniaxial compressive strength (UCS), normal stress (σn), length of joint (L), friction angle ([Formula: see text]), and joint roughness coefficient (JRC). These proposed models and methods have been quite successfully applied to rockburst and slabbing cases occurring in deep tunnels. These applications show that slab flexure is an important source mechanism invoking high wall-rock velocities and leading to severe rockburst damages in the area surrounding deep tunnels.

Stick-slip propagation velocity and seismic source mechanism

1972 ◽  
Vol 62 (6) ◽  
pp. 1621-1628 ◽  
Author(s):  
Francis T. Wu ◽  
K. C. Thomson ◽  
H. Kuenzler
Keyword(s):  
Propagation Velocity ◽  
Growth Process ◽  
Seismic Source ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Stick Slip ◽  
Two Dimensional Model ◽  
Seismic Source Mechanism ◽  
Fault Growth ◽  
Limiting Value

abstract Earthquakes, at least the shallow ones, take place along pre-existing fault planes. The controlling factor is, therefore, friction, and the fault growth process resembles that of stick-slip propagation. We have simulated this process in a two-dimensional model. It is found that propagation velocity can range from sub-shear to 1.1 Vs (the latter is not a limiting value).

The determination of source properties by the linear inversion of seismograms

1977 ◽  
Vol 67 (6) ◽  
pp. 1489-1502
Author(s):  
Brian W. Stump ◽  
Lane R. Johnson
Keyword(s):  
Moment Tensor ◽  
Seismic Source ◽  
Source Mechanism ◽  
Linear Inversion ◽  
Fault Plane Solutions ◽  
Direct Inversion ◽  
Yield Information ◽  
Time Domains ◽  
Force Moment ◽  
The Time Domain

abstract A method has been developed allowing the direct inversion of seismograms to obtain an estimate of the seismic source, as characterized by its equivalent force moment tensor. With reasonable assumptions the problem can be shown to be linear in both the frequency and time domains and least-squares methods are used to estimate the source mechanism. In the synthetic tests that have been run, several possible uses of the method have been investigated. With a satisfactory station distribution the source mechanism can be recovered using complete seismograms from three component stations or several P arrivals on vertical components. The method is useful in distinguishing multiple events including explosions. The errors of the fits are determined in the procedure and yield information such as the bandwidth of useful data in the frequency domain and error estimates for fault-plane solutions in the time domain fits.

scholarly journals Static and Dynamic Influence of the Shear Zone on Rockburst Occurrence in the Headrace Tunnel of the Neelum Jhelum Hydropower Project, Pakistan

Energies ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 2124
Author(s):  
Abdul Naji ◽  
Hafeezur Rehman ◽  
Muhammad Emad ◽  
Saeed Ahmad ◽  
Jung-joo Kim ◽  
...  
Keyword(s):  
Rock Mass ◽  
Shear Zone ◽  
Seismic Source ◽  
Shear Zones ◽  
Numerical Code ◽  
Hydropower Project ◽  
Unstable Failure ◽  
Headrace Tunnel ◽  
Rock Tunnels ◽  
Yielding Support

Rockburst is an unstable failure of a rock mass which is influenced by many factors. During deep excavations, the presence of nearby geological structures such as minor faults, joints, and shear zones increases the likelihood of rockburst occurrence. A shear zone has been observed in the headrace tunnel in the Neelum Jhelum Hydropower Project, Pakistan, which has played an important role in major rockburst events in the project’s history. A rockburst is a seismic event that involves the release of a great amount of energy as the dynamic wave radiated from the seismic source reaches the excavation boundary. In this paper, the FLAC 2D explicit numerical code has been used to simulate the dynamic phenomenon of rockburst near the shear zone in a headrace tunnel. The behavior of the rock mass around the tunnel has been studied under both static and dynamic loading. According to modeling results, rockburst significantly affected the upper left quadrant of the tunnel similar to the actual failure profile with a depth of approximately 5 m. The dynamic impact of rockburst has also affected the loading conditions of the support system in the adjacent tunnel. This study elucidates one of the most important rockburst controlling factors through numerical analysis and recommends yielding support measures that can withstand the dynamic impacts of rockburst in deep, hard rock tunnels.

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