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Defining a "Shallow" Tunnel by Stability Analysis with Dicontinuity Layout Optimization

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During excavation of NATM tunnel in soft clays, stability problems could arise when the tunnel is too shallow, necessitating special treatment for the surrounding ground such as freezing and jet grouting. However, there is generally no specific rules to help the engineers to determine the critical depth of “shallow” tunnel, which is the dividing line between stably and unstable NATM tunnel design. When using factor of safety λ to quantify the stability of unlined shallow tunnel, λ can be considered as a function of tunnel depth D, height H, width W, cohesion, friction angle, and weight of the medium C, ϕ, and γ. In this paper, aiming at finding the relationship among D, W, C, ϕ, γ and λ of unlined shallow tunnel, we conduct parameters studies with an efficient numerical method for upper bound limit analysis: Discontinuity Layout Optimi-zation. The results show it is possible to obtain λ only as a function of tunnel height and width when the other parameters are known, paving the way for quickly evaluate the stability of shallow tunnels for the researchers.

LOKASI: Ruang Koleksi Umum
RaK: 2

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Informasi Detail

Judul Seri

Proceedings of GeoShanghai 2018 International and Underground Construction

No. Panggil

624.19 (063) ZHA e

Penerbit

Singapore : Springer., 2018

Deskripsi Fisik

131-135p.: Illus.; 18 x 24 cm

Bahasa

Indonesia

ISBN/ISSN

978-981-13-0016-5

Klasifikasi

624.19 (063)

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