Locating the Poorkan-Vardij Fault Zone in the Second Lot of Karaj Water Conveyance Tunnel Using Actual TBM Performance and Operational Parameters

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Hassanpur j.; Mohammadyari z.; CHESHOMI A.

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Journal: JOURNAL OF ROCK MECHANICS Year:2017 | Volume:1 | Issue:2 Page(s): 67-74

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Title

Locating the Poorkan-Vardij Fault Zone in the Second Lot of Karaj Water Conveyance Tunnel Using Actual TBM Performance and Operational Parameters

Author(s)

Hassanpur j. | Mohammadyari z. | CHESHOMI A. | Issue Writer Certificate

Keywords

Boreability

Fault Zone

Penetration Index

Boring machine Operation

Rock Resistivity

Abstract

Summary Usually, TBM performance and operational parameters and their variations are related to variations of geological conditions along the tunnel. This relationship is the base for developing many empirical TBM performance prediction models. By knowing the geological conditions along the tunnel alignment it is possible to predict the TBM performance using these models. It’ s obvious that in the reverse way by knowing the actual performance and operational parameters of the machine in the bored tunnel, the approximate geological conditions along the tunnel can also be recognized. This technique especially in the tunnels that being bored by shielded machines can be useful for recognizing the engineering geological properties of the excavated rock masses. In this research an attempt is made to detect exact location of the poorkan-vardij active fault in the tunnel alignment using the actual TBM performance parameters. Introduction Presence of active Fault Zones can be considered as one of the main geological hazards in mechanized tunneling projects that induces serious stability problems and direct faulting during tunnel excavation and operation. During tunnel excavation when shielded machines are used for tunnel completion, due to limitations in observation of tunnel face, recognizing the exact location of Fault Zones is very difficult. Therefore it is required to use the indirect methods like using the actual performance data collected during construction and analyzing them to probe the geological conditions of tunnel alignment. In the Karaj water conveyance tunnel project (Lot 2) after tunnel breakthrough, as a client requirement, it was needed to locate the poorkan-vardij Fault Zone in the tunnel, to design a scheme for reducing the damages that may occur if the fault is activated during the tunnel operation. Methodology and Approaches In this research to detect the exact location of poorkan-vardij Fault Zone, a part of the tunnel alignment (almost 1000 meter length) around the fault is selected, and variations of TBM performance and operational parameters were analyzed. Results showed that among the considered parameters, two parameters of Field Penetration Index (FPI) and Torque/Thrust ratio are good criteria to detect Fault Zones. Results and Conclusions Results of this study by considering the direct and indirect indices showed that the crushed zone caused by poorkanvardij fault is almost 400 meters in thickness and is located in the chainage 6050 to 6450 m of tunnel alignment. This section of tunnel must be considered as the most likely position of damage zone. Therefore, special design to overcome the damages of tunnel during fault activation must be considered for this section.

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APA: Copy

Hassanpur, j., Mohammadyari, z., & CHESHOMI, A.. (2017). Locating the Poorkan-Vardij Fault Zone in the Second Lot of Karaj Water Conveyance Tunnel Using Actual TBM Performance and Operational Parameters. JOURNAL OF ROCK MECHANICS, 1(2 ), 67-74. SID. https://sid.ir/paper/268317/en

Vancouver: Copy

Hassanpur j., Mohammadyari z., CHESHOMI A.. Locating the Poorkan-Vardij Fault Zone in the Second Lot of Karaj Water Conveyance Tunnel Using Actual TBM Performance and Operational Parameters. JOURNAL OF ROCK MECHANICS[Internet]. 2017;1(2 ):67-74. Available from: https://sid.ir/paper/268317/en

IEEE: Copy

j. Hassanpur, z. Mohammadyari, and A. CHESHOMI, “Locating the Poorkan-Vardij Fault Zone in the Second Lot of Karaj Water Conveyance Tunnel Using Actual TBM Performance and Operational Parameters,” JOURNAL OF ROCK MECHANICS, vol. 1, no. 2 , pp. 67–74, 2017, [Online]. Available: https://sid.ir/paper/268317/en

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