The most recent methods being used to install conduits under roadways, pipe ramming, microtunneling, and horizontal directional drilling. This is done either by: pneumatic spindle, pile driving, by rotation (drilling) (or by auger), by thrusting using force.

* QED

No-dig pipelaying.

Otherwise you have to break it down into thrust boring, pipe jacking/ramming, etc.

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Note added at 3 hrs (2010-12-31 14:33:07 GMT)
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True, Richard, it could also cover HDD. By the same token, HAB is hardly fonçage either, and neither is battage or even impact moling. It may suit your author to use fonçage to cover a variety of technologies, but the term is hardly appropriate.
For pile driving, for instance, you have battage for impact driving and fonçage for when piles are pushed rather than hammered into the ground.

How about "microtunnelling" (though that might also cover small TBMs).

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Note added at 4 hrs (2010-12-31 14:53:32 GMT)
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Using the UKSTT definitions, I would propose the following correspondences for your specific terms.

AUGER BORING Method of forming a bore, usually from a drive pit, by means of a rotating cutting head. Spoil is removed back to the drive pit by helically wound auger flights rotating in a steel casing. The equipment may have limited steering capability.
le fonçage par rotation (ou à la tarière)
EARTH PIERCING Term commonly used in North America as an alternative to Impact Moling.
(pneumatic) IMPACT MOLING Method of creating a bore using a PNEUMATIC OR HYDRAULIC HAMMER within a casing, generally of torpedo shape. The term is usually associated with non- steered or limited steering devices without rigid attachment to the launch pit, relying upon the resistance of the ground for forward movement. During the operation the soil is displaced, not removed. An unsupported bore may be formed in suitable ground, or a pipe drawn in or pushed in behind the impact moling tool. Cables may also be drawn in.
le fonçage par fusée pneumatique
IMPACT RAMMING See PIPE RAMMING
le fonçage par battage
MICROTUNNELLING Method of steerable remote control pipe jacking to install pipes of internal diameter less than that permissible for man-entry. In North America the term is used to describe remote control continuous pipe jacking in all diameters.
PIPE JACKING Method for directly installing pipes behind a shield machine by hydraulic or other jacking from a drive shaft such that the pipes form a continuous string in the ground.
PIPE RAMMING Non-steerable method of forming a bore by driving a steel casing, usually open-ended, with a percussive hammer from a drive pit. The soil may be removed by augering, jetting or compressed air. In appropriate ground conditions a closed casing may be used.
le fonçage par battage
ROD PUSHING Method of forming a pilot bore by driving a closed pipe head with rigid attachment from a launch pit into the soil which is displaced. Limited steering and monitoring capability may be provided, usually in conjunction with a locator.
le fonçage par poussée
THRUST BORING Unpreferred term, loosely applied to various trenchless installation methods. See Rod Pushing.
THRUST JACKING METHOD Method in which a pipe is jacked through the ground without mechanical excavation of material from the front of the pipeline.
le fonçage par poussée



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Note added at 4 hrs (2010-12-31 14:54:18 GMT)
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Not immediately clear, I'm afraid, but the French in bold matches the term ABOVE it.