No, just filling around the tree will kill it by smothering the roots and also exposing the trunk to the risk of rot.

I've attached a link to an excellent paper on building tree wells, including how to keep air going to the roots.

I've seen this done in multiple locations by building a brick or rock wall around the base of the tree up to the height that you want to raise ground level. It has to be big enough around to let air get down the roots.

You can do this as a "well" type structure or something a little more smooth like a rock lined depression.
Source(s):
http://www.wvu.edu/~exten/infores/pubs/homgardn/treewell.pdf

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