Central Mine Equipment Company Quality Sampling
Top Ten Reasons to Drill a Hole
Top Ten Reasons to Drill a Hole • Getting paid for it
Top Ten Reasons to Drill a Hole • Getting paid for it • Needed to get out of the shop
Top Ten Reasons to Drill a Hole • Getting paid for it • Needed to get out of the shop • Had to have something to write on this paper (log)
Top Ten Reasons to Drill a Hole • Getting paid for it • Needed to get out of the shop • Had to have something to write on this paper (log) • Exercise
Top Ten Reasons to Drill a Hole • Getting paid for it • Needed to get out of the shop • Had to have something to write on this paper (log) • Exercise • Helper ran me out of truck with smell
Top Ten Reasons to Drill a Hole • Getting paid for it • Needed to get out of the shop • Had to have something to write on this paper (log) • Exercise • Helper ran me out of truck with smell • Needed some place to put all this PVC
Top Ten Reasons to Drill a Hole • Getting paid for it • Needed to get out of the shop • Had to have something to write on this paper (log) • Exercise • Helper ran me out of truck with smell • Needed some place to put all this PVC • Ran out of coffee
Top Ten Reasons to Drill a Hole • Getting paid for it • Needed to get out of the shop • Had to have something to write on this paper (log) • Exercise • Helper ran me out of truck with smell • Needed some place to put all this PVC • Ran out of coffee • To see what’s at the bottom of hole
Top Ten Reasons to Drill a Hole • Getting paid for it • Needed to get out of the shop • Had to have something to write on this paper (log) • Exercise • Helper ran me out of truck with smell • Needed some place to put all this PVC • Ran out of coffee • To see what’s at the bottom of hole • It stopped raining
Top Ten Reasons to Drill a Hole • Getting paid for it • Needed to get out of the shop • Had to have something to write on this paper (log) • Exercise • Helper ran me out of truck with smell • Needed some place to put all this PVC • Ran out of coffee • To see what’s at the bottom of hole • It stopped raining • Get QUALITY samples
Quality Sampling • Means not letting the Drilling Method or other Intangibles Change the Samples
Quality Sampling How many samplers are there? • Split spoon • Continuous samplers • Piston samplers • Direct push • Bulk sampling • Rotary samplers (including coring) • Bailers
Quality Sampling Geotechnical • Drive Sampling • Push (hydraulic) Sampling • Continuous Sampling • Push Testing • Rotary Sampling (including coring) • Direct Push Sampling • Bulk Sampling
HSA Sampling
Open Hole Rotary Problems
Flight Auger Problems
Quality Sampling • Geotechnical • Environmental
Quality Sampling Environmental • Drive Sampling • Push (Hydraulic) Sampling • Continuous Sampling • Rotary Sampling (including coring) • Direct Push Sampling • Bulk Sampling
Quality Sampling • Geotechnical • Environmental • Water Well
Quality Sampling Water Well • Push (Hydraulic) Sampling • Continuous Sampling • Rotary Sampling (including coring) • Bulk Sampling • Bailer Sampling • Cuttings • Water (Quality and volume)
Open Hole Rotary Problems
Quality Sampling • Geotechnical • Environmental • Water Well • Mining
Quality Sampling Mining • Push (Hydraulic) Sampling • Continuous Sampling • Rotary Sampling (including coring) • Bulk Sampling • Cuttings
Quality Sampling What Can Influence Samples • Drilling Method
ASTM Standards • 4.6 Difficulties in drilling may occur if cohesionless soils are drilled below the water table. Possibilities for sand lock or wedging of cuttings may occur (2). In cases where sands enter the HSA, water or drilling fluid may be added to the HSA column to provide hydrostatic balance or special pilot bit assemblies can be used (see 5.6). Problems may occur in getting the soil core barrel or pilot bit assembly back to the bottom of the HSA column. Highly saturated sands or liquefiable material may be drawn into the HSA by vacuum created when the sampler barrel or pilot bit assembly is initially pulled back through the cutter head of the lead auger assembly from the bottom of the borehole.
Flight Auger Problems
ASTM Standards • 4.5.3 SPT is also performed at shallow depths above the ground- water table using solid stem flight augers (Practice D1452/D1452M), but below the water table borings may be subject to caving sands. Solid stem borings have been drilled to depths of
Drive Casing
ASTM Standards • 4.5.2 SPT is used with other drilling methods including reverse circulation, sonic drilling, and direct push methods practices. There are concerns, undocumented by research, with direct push (Guide D6282/D6282M), sonic drilling (Practice D6914/D6914M), and reverse circulation methods using heavy casing drive hammers (Guide D6286), that the extreme dynamic loading and vibrations could disturb some soils such as sands and soft clays past the seating interval. The professional responsible for the investigation should evaluate SPT under these conditions and if drilling disturbance is suspected, then N values can be checked against other drilling methods in section 4.5 or deploy the alternate drilling method through and ahead of the casings.
Quality Sampling What Can Influence Samples • Drilling Method • Material
Quality Sampling What Can Influence Samples • Drilling Method • Material • Sampler
Quality Sampling What Can Influence Samples • Drilling Method • Material • Sampler • Driller
ASTM Standards • 1.4 This practice offers a set of instructions for performing one or more specific operations. This document cannot replace education or experience and should be used in conjunction with professional judgment. Not all aspects of this practice may be applicable in all circumstances. This ASTM standard is not intended to represent or replace the standard of care by which the adequacy of a given professional service must be judged, nor should this document be applied without consideration of a project’s many unique aspects. The word “Standard” in the title of this practices means only that the document has been approved through the ASTM consensus process.
Quality Sampling What Can Influence Samples • Drilling Method • Material • Sampler • Driller • Water
Open Hole Rotary
Quality Sampling What Can Influence Samples • Drilling Method • Material • Sampler • Driller • Water • Additives
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