Abstract
Generally for the purpose of minimizing maintenance and repairs and of ensuring higher safety and repairs and better visibility, cement concrete and semi-flexible pavements are used extensively for road section in tunnels. However, the tunnel, which is the subject of the present investigation, inevitably suffers from reflective cracking by differential settlement of the ground or due to other causes and from leakage at the cracks of bottom slabs because it was built on a very weak ground. Under these unfavorable conditions., using a cement concrete pavement might result in early cracking. For this tunnnel, therefore, we investigated a pavement structure which is capable of reducing the occurrence of reflection cracks and of draining water leaking out at the bottom slab cracks. As a result, a mixture, which is used for draining type pavements, was applied for the layer being in contact with the bottom slabs. We confirmed the validity of this method from the result of the follow-up survey of five years.
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