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Geomechanics and Engineering Volume 15, Number 2, June10 2018, pages 769-774 DOI: http://dx.doi.org/10.12989/gae.2018.15.2.769 |
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The impact of EPB pressure on surface settlement and face displacement in intersection of triple tunnels at Mashhad metro |
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Fatemeh Eskandari, Kamran Goshtasbi Goharrizi and Amir Hooti
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| Abstract | ||
| The growth of cities requires the construction of new tunnels close to the existing ones. Prediction and control of ground movement around the tunnel are important especially in urban area. The ground respond due to EPB (Earth Pressure Balance) pressure are investigated using the finite element method by ABAQUS in intersection of the triplet tunnels (Line 2, 3 and 4) of Mashhad Urban Railway in Iran. Special attention is paid to the effect of EPB pressure on the tunnel face displacement. The results of the analysis show that in EPB tunneling, surface settlement and face displacement is related to EPB pressure. Moreover, it is found that tunnel construction sequence is a great effect in face displacement value. For this study, this value in Line 4 where is excavated after line 3, is smaller than that line. In addition, the trend of the displacement curves are changed with the depth for all lines where is located in above and below, close to and above the centerline tunnel face for Line 2, 3 and 4, respectively. It is concluded that: (i) the surface settlement decreases with increasing EPB pressure on the tunnel face; (ii) at a constant EPB pressure, the tunnel face displacement values increase with depth. In addition, this is depended on the tunneling sequence; (iii) the trend of the displacement curves change with the depth. | ||
| Key Words | ||
| multiple tunnels; finite element method; surface settlement | ||
| Address | ||
| Fatemeh Eskandari: Department of Rock Mechanics Engineering, Tarbiat Modares University, Jalal Ale Ahmad Highway, Tehran, Iran Kamran Goshtasbi Goharrizi: Department of Mining Engineering, Tarbiat Modares University, Jalal Ale Ahmad Highway, Tehran, Iran Amir Hooti: Department of Geotechnical Engineering, Tarbiat Modares University, Jalal Ale Ahmad Highway, Tehran, Iran | ||