1986 Soviet Materials Sci. 21 425 The formation of spherical particles must be related to microtunnelling of a fatigue crack and rupture of the crosspieces between the microtunnels in rotational plastic deformation of the material.

1991 Sci. Amer. Sept. 127/1 Perhaps the most sophisticated example of trenchless technology is microtunneling.

1995 Constr. Equipm. (Nexis) 91 58 I see auger boring replacing microtunneling for a lot of future work. The equipment is less expensive, and it costs less to operate.

2000 Evening Standard (Electronic ed.) 17 Mar. With trenchless technology the utilities and their contractors can install new cables and pipelines by microtunnelling, directional drilling, impact moling and pipe ramming without significant disruption.

1986 Japan Telecommunications Rev. 28 287 (title) Advanced microtunneling technology for telecommunications conduits.

1986 Telephone Engineer & Managem. (Nexis) 1 Sept. 52 The special microtunnelling equipment used was developed specifically for the communications industry, being lightweight and quickly mobilized.

1991 Sci. Amer. Sept. 127/2 Seven-foot-long microtunneling machines, also called moles, use rotary cutting heads that can slant up, down or sideways to carve eight-to 36-inch-diameter holes through soils ranging from clay to soft rock.

1997 San Diego Union-Tribune (Electronic ed.) 31 Jan. By using ‘microtunneling’ techniques to place drainage pipes as much as 54 feet beneath the fragile bluffs, the system needed to allow runoff to fall harmlessly into coastal waters can be installed without any damage.