More than 100 proposed changes in Fairfax County's comprehensive land-use plan were filed with county officials this week, including variations on two controversial proposals that were rejected earlier this year.

The number of proposed changes was unexpectedly high, considering that proposals must meet strict emergency needs status to be approved during the 1986 annual review of the land-use plan, according to county planning staff members.

The total number of items filed by residents, landowners, lawyers and developers still is being tallied by planning commission staff members, but William Keefe, chief of the county's comprehensive plan branch, said it already tops 110. Others still may come in and will be considered as long as they were postmarked by the Dec. 2 deadline.

Keefe said he expects another 40 to 50 proposals to be initiated by the planning staff, members of the planning commission or the board of supervisors, who have until early January to suggest changes.

More than 350 proposed changes to the plan were filed during the 1985 review. Action is still pending on 75 of them because of ongoing studies on topics such as the need for additional multifamily housing throughout the county, development around Metro stations and a review of the existing development plan for the Rte. 50/I-66 corridor in the Fair Oaks area.

Even though their efforts failed to win suppport in past years, several landowners have filed proposed changes involving the same sites that were previously rejected by the county planning commission.

Two of the most controversial proposals involve major parcels in western Fairfax.

Boston Properties, for the third year in a row, has asked for approval for changes in the land plan for a 147-acre site in the southeast corner of the Hunter Mill Road intersection with the Dulles toll road.

Attorney Edward A. Prichard said the new proposal calls for residential development and "a corporate headquarters" building. That is a dramatic reduction from Boston Properties' last effort to have the tract designated for more than 2 million square feet of commercial space in 17 buildings. That proposal was killed by the planning commission late last spring.

Developers James T. Lewis and Jack Crippen are seeking to build 2,700 residential units on 273 acres straddling Leesburg Pike and Baron Cameron Avenue near Reston and Great Falls under a planned development housing zoning category.

Lewis and Crippen, operating as JTL/Crippen, are asking for a PDH8 zoning designation, which would generally allow eight units on each acre, though as many as 10 per acre could be built under a bonus system, planners said.

Lewis is the developer of Tycon Towers at Tysons Corner and the giant Port America project in Prince George's County. He said the plan to develop the site along Rte. 7 for residential purposes meets many of the county's current needs.