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List of products by author: S. Ahmed
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Experimental Study on the Effect of Localized Weak Zones on the Seismic Behavior of Shallow Tunnels
Abstract: Weak zones around the tunnel lining may be formed because of the poor workmanship, inadequate back-filling, weathering or erosion. The situation is more complicated as such weak zones formation behind the lining, may not be readily spotted until substantial damage to the lining has been produced. Several case histories showed that the main factors for the failure of tunnels were the weak zones...
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Static and dynamic response of circular tunnels withcavities behind the lining
Abstract: Cavities may be produced behind the lining due to improper backfilling, water erosion, or poor quality. Literature confirms that the creation of cavities is one of the primary reasons for the failure of tunnels. This paper presents experimental results of the cavity-induced ground movement, shear strain, and changes in the stress states of the lining. The effects of cavities with different...
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