Garden deck anchoring

[threedee]

I'm thinking on building a deck over my messy back garden. Grass is massacred by ten ton front loader wheels (dont ask). No point digging it out as there's clay right under. Hence the deck.

However, we here get some severe winds and i'm not confident its not gonna fly away one day in november. My flat shed roof flown off to neighbours field so not taking that chance with a big *** flat surface again.

Most builds i find are of free standing decks, propped on blocks to prevent rot.
How do i anchor it to the ground ? Wooden posts will rot, digging in clay is a bit much, etc.

Any advice on this is appreciated.

 

[r896neo]

Concrete your posts into the ground, also fit a skirt to stop wind whipping under the deck.

 

[CaptainJack88]

Concrete your posts into the ground, also fit a skirt to stop wind whipping under the deck.

This. Dig some holes so it's propped up sufficiently. Hold all the posts together by tacking wood to them and then pour some postcrete into the holes and fill with water. 15 minutes and they'll be rock hard.
Build your deck frame off the posts