Sulphatic claystones exhibit a heavily swelling behavior and are among the most problematic rocks for tunnelling. Their swelling is usually attributed to the transformation of anhydrite to gypsum. The paper questions this simplistic hypothesis through a qualitative ...

<p>The paper describes the design considerations and the experiences from the<br />construction of two shallow motorway tunnels in Greece. The ground consists of stiff clays, clayey sands and silts. The hydrogeological conditions are complex.<br />The tunnels ...