STABILITY ANALYSIS OF TUNNEL, PORTAL TRENCH AND UNSTABLE WEDGES OF THE TUNNEL IN THE SHENAGE 47+400 GHAZVIN-RASHT-ANZALI RAILROAD USING STEREONET AND COMPUTER SIMULATION

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HASANI HOSSEIN; ARSHADNEZHAD SH.

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Journal: INDUSTRIAL ENGINEERING & MANAGEMENT SHARIF (SHARIF: ENGINEERING) Year:2007 | Volume:23 | Issue:39 Page(s): 31-40

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Title

STABILITY ANALYSIS OF TUNNEL, PORTAL TRENCH AND UNSTABLE WEDGES OF THE TUNNEL IN THE SHENAGE 47+400 GHAZVIN-RASHT-ANZALI RAILROAD USING STEREONET AND COMPUTER SIMULATION

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HASANI HOSSEIN | ARSHADNEZHAD SH. | Issue Writer Certificate

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Abstract

Observing authorized slopes in a railway makes the use of tunnels in mountainous areas inevitable. The tunnel on the 47+400 km of the Ghazvin-Rasht- Anzali railway path is being studied. The relevant location facing the Sefidrood River on the western part of the Alborz mountain range includes andesite and trachy-andesite rocks of the Eocene age. The track of the tunnel and its entrance trench lies among the jointed rock masses of thick layers crossed by a regional fault. Its exit trench lies on a series of alluvial sediments (Quaternary). The subject of this study also includes local slides in the slope level and the risk of landslides, which is a point of concern regarding the safety and security of the tunnel, as to the stability of the jointed rock mass on the entrance trench of the middle part of the tunnel.The length of the tunnel is 490 meters and the maximum height of the overburden is approximately 150 meters with a relatively east-west trend. The results of geo-engineering surveys and statistical jointgraphics of stereograms reveal at least three discontinuity systems in the rock mass. Several tunnel sections along the tunnel were studied, in order to analyze the stability of rocky wedges inside the tunnel, as well as that of the entrance trench. After finding the geo-mechanic constants and geometric specifications of the joints, the data were analyzed by the use of Unwedge Software in the inner part of the tunnel and a structural method for the entrance trench. The critical section with the highest overburden was modeled by Phase2 software. The results show that in the aforementioned locations inside the tunnel and trench walls there are the risks of plane failure, wedge failure and toppling. The stable slope for the right side wall of the trench is 72 degrees and that of the left wall is 5 degrees.One of the most important aspects of the railway tunnel is bottom settlement. Therefore, the authors have developed a new formula for determination of the maximum allowable bearing capacity of the rock foundation based on RMR. Results show that there is no problem in the tunnel stability in the settlement.

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APA: Copy

HASANI, HOSSEIN, & ARSHADNEZHAD, SH.. (2007). STABILITY ANALYSIS OF TUNNEL, PORTAL TRENCH AND UNSTABLE WEDGES OF THE TUNNEL IN THE SHENAGE 47+400 GHAZVIN-RASHT-ANZALI RAILROAD USING STEREONET AND COMPUTER SIMULATION. INDUSTRIAL ENGINEERING & MANAGEMENT SHARIF (SHARIF: ENGINEERING), 23(39), 31-40. SID. https://sid.ir/paper/107724/en

Vancouver: Copy

HASANI HOSSEIN, ARSHADNEZHAD SH.. STABILITY ANALYSIS OF TUNNEL, PORTAL TRENCH AND UNSTABLE WEDGES OF THE TUNNEL IN THE SHENAGE 47+400 GHAZVIN-RASHT-ANZALI RAILROAD USING STEREONET AND COMPUTER SIMULATION. INDUSTRIAL ENGINEERING & MANAGEMENT SHARIF (SHARIF: ENGINEERING)[Internet]. 2007;23(39):31-40. Available from: https://sid.ir/paper/107724/en

IEEE: Copy

HOSSEIN HASANI, and SH. ARSHADNEZHAD, “STABILITY ANALYSIS OF TUNNEL, PORTAL TRENCH AND UNSTABLE WEDGES OF THE TUNNEL IN THE SHENAGE 47+400 GHAZVIN-RASHT-ANZALI RAILROAD USING STEREONET AND COMPUTER SIMULATION,” INDUSTRIAL ENGINEERING & MANAGEMENT SHARIF (SHARIF: ENGINEERING), vol. 23, no. 39, pp. 31–40, 2007, [Online]. Available: https://sid.ir/paper/107724/en

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