By John Lowe III, Philip F. Zaccheo (auth.), Hsai-Yang Fang Ph.D. (eds.)

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However, under certain circumstances backfilling with grout is advisable. S. Army Corps of Engineers (1972) recommends the use of grout in cases where it is essential to prevent the movement of water from one stratum to another and to preclude piping of material to the surface through the borehole. Included in this category are all borings on the land side of levees, downstream of dams and proposed embankments, and at the proposed locations of structures. The Corps also recommends that holes upstream of dams and proposed embankments be grouted if they penetrate natural valley blankets of impervious material and extend into pervious strata.

Changes in the nature of the materials penetrated by this method are noted by observations similar to those used in wash boring. These include rate of progress, behavior of the drilling tools, color of the slurry, and character of the cuttings. The primary advantage of the percussion method is that it may be used in most materials and is particularly useful for borings that must penetrate coarse granular materials, soils such as glacial till containing boulders, and rock such as limestone which may contain caverns.

It is also attached to the cathead by means of a rope, which passes through the sheave and is attached to the lifting bail. The tools are then lowered to the level of soil in the casing, and drilling fluid under pressure is introduced at the bottom of the hole by means of water passages in the drill rods and the chopping bit. At the same time, the bit is raised and dropped by means of the rope attached to the lifting bail. Each time the rods are dropped they also are partially rotated manually by means of a wrench placed around the rods or a device called a tiller (Fig.

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