Core drill depth measurement standard specification

What is a core drilling practice?

1.1 This practice covers the guidelines, requirements, and procedures for core drilling, coring, and sampling of rock for the purposes of site exploration. The borehole could be vertical, horizontal, or angled.

How long should a drill core specimen be?

ng6.1 Drill core specimens shall be NX or larger core art at least 15 cm in length. Block specimens shall have edge lengths of at least 15 cm. Rock surfaces tested in place, including natural outcrops or prepared surfaces such as tu nel walls or floors, shall have a smooth, flat test area at le

What is standard practice for rock core drilling & sampling?

tandard Practice forRock Core Drilling and Sampling of Rock for Site Investigation1This standard is issued under the fixed designation D 2113; the number immediately following the designation indicates he year of original adoption or, in the case of revision, the

Which nomenclature is used for drill hole sizing?

DMA) (5,10). Table 1 provides a summary of nomencla-ture used for drill hole sizing. For each size of hole, there is a family of casings, core barrels, bits, casing bits, and dri l rods with the same primary letter symbol (A through Z) whose design is compatible. Furthermore, the size steps are such

What size drill core should be used for RQD logging?

It has since become virtually standard practice in drill core logging for a variety of core sizes and rock types. ASTM International indicates core sizes from BX (1.44 in. (36.6 mm)) to PX (3.35 in. (85.1 mm)) are normally acceptable for measuring RQD.

Where can I find a basic drill guide?

fety Guide, National Drilling Association, 3008 Millwood Ave., Columbia, SC, 29205.Acker III, W. L., Basic rocedures for Soil Sampling and Core Drilling, Acker Drill Co., Scranton, PA, 1974.Australian Drilling Manual, Australian Drilling Industry Training