List of products by author: H. Akagi

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  Long-Term Subsidence of A Shield Tunnel in Alluvial Clay

  Abstract: Underground construction in the low-permeability ground often leads to long-term continuous ground subsidence. By tunneling, new drainage boundaries introduce into the ground system and water content around tunnel changes. The decrease in pore water pressure around tunnel causes consolidation of low-permeable soil around the tunnel. The existence of small cracks or construction defect in the...

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  Thermal analyses of passive infrared thermography application in the tunnel lining with defects

  Abstract: The existence of cracks and defects are common problems in old underground tunnels. In some cases, defections or large cracks might result in accidents because of concrete block spalling during operational hours. Infrared thermography is a nondestructive method to detect hidden defects in the concrete lining of tunnels by taking thermal images from the surface of defected area.By taking thermal...

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