Laserfiche WebLink
Western Dam Engineering <br />Technical Note <br />9 <br />investigation plan. The preferred method of drilling and <br />sampling on and around dams is with the hollow stem <br />auger drilling method, as this method best protects the <br />embankment. Sonic drilling should be the next preferred <br />method if the auger method will not work, such as in <br />rockfill. If possible, avoid drilling in the core zone of the <br />embankment. Never drill in the cut-off trench, near <br />conduits in the embankment, or in areas that may be <br />susceptible to damage. Prior to and during drilling, <br />conditions at the dam should be monitored by reading <br />piezometers and seepage weirs, and visually observing <br />for signs that drilling and sampling might be causing <br />damage to the embankment or foundation. Consider <br />including procedures for dealing with damage to the <br />embankment in the geotechnical investigation plan. <br />Always review your drilling and sampling plan with the <br />appropriate dam safety regulator as part of the <br />investigation plan development process. <br />References <br />[1]ASTM D1452-09 Standard Practice for Soil Exploration and Sampling by <br />Auger Borings. <br />[2]ASTM D1586-11 Standard Test Method for Standard Penetration Test <br />(SPT) and Split-Barrel Sampling of Soils. <br />[3]ASTM D1587-08 (2012) Standard Practice for Thin Walled Tube <br />Sampling of Soils for Geotechnical Purposes. <br />[4]ASTM D2113-08 Standard Practice for Rock Core Drilling and Sampling <br />of Rock for Site Investigation. <br />[5]ASTM D3350 01(2007) Standard Practice of Thick Wall, Ring-Lined, <br />Split Barrel, Drive Sampling of Soils. <br />[6]ASTM D5781/D5781M-13 Standard Guide for Use of Dual-Wall Reverse- <br />Circulation Drilling for Geoenvironmental Exploration and the <br />Installation of Subsurface Water-Quality Monitoring Devices. <br />[7]ASTM D5782-95 (Reapproved 2000) Standard Guide for Use of Direct <br />Air-Rotary Drilling for Geoenvironmental Exploration and the <br />Installation of Subsurface Water-Quality Monitoring Devices. <br />[8]ASTM D5783-95 (Reapproved 2000) Standard Guide for Use of Direct <br />Rotary Drilling with Water-Based Drilling Fluid for Geoenvironmental <br />Exploration and the Installation of Subsurface Water-Quality <br />Monitoring Devices. <br />[9]ASTM D5872-95 (Reapproved 2000) Standard Guide for Use of Casing <br />Advancement Drilling Methods for Geoenvironmental Exploration and <br />the Installation of Subsurface Water-Quality Monitoring Devices. <br />[10]ASTM D6151-08 Standard Practice for Using Hollow-Stem Augers for <br />Geotechnical Exploration and Soil Sampling. <br />[11]ASTM D6286-12 Standard Guide for Selection of Drilling Methods for <br />Environmental Site Characterization. <br />[12]ASTM D6914-04 Standard Practice for Sonic Drilling for Site <br />Characterization and the Installation of Subsurface Monitoring Devices. <br />[13]U.S. Dept. of Interior, Bureau of Reclamation (Reclamation), 1999. <br />Standard Penetration Test Driller’s/Operator’s Guide. DSO-98-17. Earth <br />Sciences and Research Laboratory, Dam Safety Office.