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What time of year? summer : What sort of period are you aiming for this structure to last? one month minimum
Are you aiming to use only natural substances? yes, ideally found on the spot
What type of soil will you be putting over the clay? see above
Have done or thought about a Risk Assessment? May I ask whether you see other risks apart from collapse?
Will people be allowed to walk through the tunnel? yes
Have you considered the need for a permanent on-site presence? The calculations should make this obsolete.
You sure as heck need to know the cation exchange capacity of your clay to know how prone it will be to hydration. A montmorillonite clay, for example, can easily swell by 900% when exposed to water.