Journal of Innovative Research in Engineering Sciences

Issn:2476-7611

Article

Evaluation and analysis of stability of shallow and deep tunnels drilled in rock under static and seismic loads

Siamak Davoudinezd
Abstract

In this study, the stability and analysis of surface and deep tunnels drilled in rock under static and seismic loads were evaluated and analyzed based on parametric studies using finite element numerical method and Plaxis software. Based on the results of static analysis, it was found that for tunnels at depths of 8 and 16 meters, the static reliability coefficients for the tunnel at a depth of 4 meters, respectively, decreased by 22 and 26 percent. Also, based on the results of seismic analysis, it was found that for tunnels at depths of 8 and 16 meters, respectively, seismic reliability coefficients compared to seismic reliability for tunnels at depths of 4 meters, decreased by 22 and 25 percent, which is similar to It is static. But the interesting thing is that at the beginning and for a relatively large number of steps, the reliability was a very low and, of course, constant value, which was close to one in critical conditions. Then, considering the record of the earthquake, which has decreased greatly from the twelfth second of its acceleration and fluctuations, the coefficient of confidence suddenly increased, which is interesting, and in fact it can be said that the changes in the coefficient of confidence during the earthquake can be It happens suddenly and in a very short time, which of course depends on the type and characteristics of the earthquake. Also, the seismic reliability has increased by increasing the joint angle from 10 to 30 degrees. In general, for seam angles close to the internal friction angle, the effects of soil and rock locking are greater, and as a result, the reliability increases, but for seam angles greater than the internal friction angle, the reliability decreases again, and finally this The reduction can be to the extent that the conditions for surrender and rupture are created in principle.

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Keywords
Keyword:1- Stability Analysis
Keyword:2- Finite Element Numerical Method
Keyword:3- Parametric Studies
Keyword:4- Plaxis Software
Keyword:5- Reliability

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