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The Effect of Earthquake Acceleration on the Yielding of Rock Bolts in the Tunnels

Journal Name:

  • International Journal of Science and Engineering Investigations

Publication Year:

  • 2016

Key Words:

Author NameUniversity of Author
Abstract (2. Language): 
In this study, through pseudo-static analysis with the help of finite element modeling software phase2, the effect of earthquake acceleration on the yielding of rock bolts in the tunnels is evaluated. The circular tunnels are modeled in depths of 10, 25 and 35 meters in the shale rocks. The tunnels are supported by end anchored rock bolts with length of 3 meters and spacing of 2 meters and the earthquake with magnitude of 8 on the Richter scale is considered for dynamic mode. The results of the evaluations show that the distribution of the stress around the tunnels resembles an ellipse and the long-axis of this ellipse follows the direction of horizontal seismic coefficient (Kh). The compressive stresses parallel to short-axis of ellipse and the tensile stresses along the long-axis of ellipse have been formed which is very important and can influence the stability of rock bolts. Furthermore, by increasing the depth of tunnels, the tensions around the tunnels has increased and it leads to increasing the number of yielded rock bolts.
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REFERENCES

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