ASDSO Dam Safety Toolbox

Coring: Difference between revisions

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Rock coring is used to obtain in-situ rock / soil samples and strength parameters through tests such as the Standard Penetration Test (SPT). "Cylinder samples from 4 to 8 inches in diameter and 6 to 12 inches long... may also be obtained by jacking or otherwise pushing drive samples into exposed surfaces using a continuous steady pressure. Hydraulic power equipment may also be used to push Shelby tubes into exposed undisturbed soil to collect undisturbed samples, such as the sampler mounted on a backhoe."<ref name="NEH_CH5">[[National Engineering Handbook: Chapter 5 - Engineering Geology Logging, Sampling, and Testing | National Engineering Handbook: Chapter 5 - Engineering Geology Logging, Sampling, and Testing, NRCS, 2012]]</ref>
Rock coring is used to obtain in-situ rock / soil samples and strength parameters through tests such as the Standard Penetration Test (SPT). "Cylinder samples from 4 to 8 inches in diameter and 6 to 12 inches long... may also be obtained by jacking or otherwise pushing drive samples into exposed surfaces using a continuous steady pressure. Hydraulic power equipment may also be used to push Shelby tubes into exposed undisturbed soil to collect undisturbed samples, such as the sampler mounted on a backhoe."<ref name="NEH_CH5">[[National Engineering Handbook: Chapter 5 - Engineering Geology Logging, Sampling, and Testing | National Engineering Handbook: Chapter 5 - Engineering Geology Logging, Sampling, and Testing, NRCS, 2012]]</ref>


==Soil Sampling Tools==
"Rock core [[drilling]] is accomplished with mechanical, engine-powered rotary drills designed to [[drill]] rock and to recover cylindrical cores of rock material. Most core drilling equipment is designed with gear or hydraulically driven variable-speed hollow-spindle rotary drill heads. Average core-diameter capability of these drills ranges from 19 to 85 mm (3/4 to 3-3/8 in) and to 300-m (1,000-ft) depths. Larger-diameter coring operations [100 to 150 mm (4 to 6 in)] are usually performed using rotary drills, and cores to 1.8 m (6 ft) in diameter can be drilled and recovered using a shot/calyx drill."<ref name="EarthManualP1">[[Earth Manual Part 1 | Earth Manual Part 1, USBR, 1998]]</ref>
*[[Open-Drive and Piston Samplers]]
*[[Thin-Wall Open-Drive Samplers]]
*[[Piston-Drive Samplers]]
*[[Split-Barrell Samplers]]
*[[Double-Tube Soil Core Barrel (Dension Type)]]
*[[Rock Core Barrel Samplers]]


==Rock Sampling Tools==
"All core drills are equipped with pumps or compressors to circulate drill media through use of water, drilling mud, air, or air-foam to cool and lubricate the coring bits and to transport the drill cuttings to the top of the hole. Most core drills are equipped with a mast assembly, powered hoist assembly for hoisting heavy loads, and, sometimes, a wire-line hoist assembly for hoisting or lowering a wire-line core barrel through the drill rods."<ref name="EarthManualP1" />
*[[Air Percussion Samplers]]
 
*[[Wireline Samplers]]
"Many variations are available in design and mountings for drill rigs manufactured specifically for coring; however, there are only two types basic types. They are conventional or wire-line core drills, for drilling and recovering cores up to 150 mm (6 in) in diameter, and shot/calyx core drills for drilling, and recovering cores to 1.8 m (6 ft) in diameter."<ref name="EarthManualP1" />


==[[Best Practices Resources]]==  
==[[Best Practices Resources]]==  
{{Document Icon}} [[National Engineering Handbook: Chapter 5 - Engineering Geology Logging, Sampling, and Testing | National Engineering Handbook: Chapter 5 - Engineering Geology Logging, Sampling, and Testing (NRCS, 2012)]]
{{Document Icon}} [[National Engineering Handbook: Chapter 5 - Engineering Geology Logging, Sampling, and Testing | National Engineering Handbook: Chapter 5 - Engineering Geology Logging, Sampling, and Testing (NRCS, 2012)]]
{{Document Icon}} [[Earth Manual Part 1 | Earth Manual Part 1 (USBR, 1998)]]


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Revision as of 21:02, 1 November 2022



Rock Core Samples

Rock coring is used to obtain in-situ rock / soil samples and strength parameters through tests such as the Standard Penetration Test (SPT). "Cylinder samples from 4 to 8 inches in diameter and 6 to 12 inches long... may also be obtained by jacking or otherwise pushing drive samples into exposed surfaces using a continuous steady pressure. Hydraulic power equipment may also be used to push Shelby tubes into exposed undisturbed soil to collect undisturbed samples, such as the sampler mounted on a backhoe."[1]

"Rock core drilling is accomplished with mechanical, engine-powered rotary drills designed to drill rock and to recover cylindrical cores of rock material. Most core drilling equipment is designed with gear or hydraulically driven variable-speed hollow-spindle rotary drill heads. Average core-diameter capability of these drills ranges from 19 to 85 mm (3/4 to 3-3/8 in) and to 300-m (1,000-ft) depths. Larger-diameter coring operations [100 to 150 mm (4 to 6 in)] are usually performed using rotary drills, and cores to 1.8 m (6 ft) in diameter can be drilled and recovered using a shot/calyx drill."[2]

"All core drills are equipped with pumps or compressors to circulate drill media through use of water, drilling mud, air, or air-foam to cool and lubricate the coring bits and to transport the drill cuttings to the top of the hole. Most core drills are equipped with a mast assembly, powered hoist assembly for hoisting heavy loads, and, sometimes, a wire-line hoist assembly for hoisting or lowering a wire-line core barrel through the drill rods."[2]

"Many variations are available in design and mountings for drill rigs manufactured specifically for coring; however, there are only two types basic types. They are conventional or wire-line core drills, for drilling and recovering cores up to 150 mm (6 in) in diameter, and shot/calyx core drills for drilling, and recovering cores to 1.8 m (6 ft) in diameter."[2]

Best Practices Resources

National Engineering Handbook: Chapter 5 - Engineering Geology Logging, Sampling, and Testing (NRCS, 2012)

Earth Manual Part 1 (USBR, 1998)



Citations:



Revision ID: 4068
Revision Date: 11/01/2022