Document: NRC Regulatory Guide
Document ID: a094549d-8685-4dad-b90f-c28c7d279a53
Document Type: regulatory_guide
Title: Geologic and Geotechnical Site Characterization Investigations for Nuclear Power Plants + HISTORY – HISTORY 08/2021 – DG-1392 , Proposed Revision 3 07/2014 – Periodic Review of Revision 2 – Reviewed with no issues identified 02/2001 – DG-1101 , Proposed Revision 2 (Rev. 3)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2119/ML21194A176.pdf
Revision Date: 2023-05
Chapter: 
Section ID: RG-1.132
CFR Part: 
CFR Title: 

Content:
. DG-1392, Appendix F, Page F-2 APPENDIX F, Cont’d. Table F-2 In Situ Tests to Determine Shear Strength (adapted from EM 1110-1-1804, U.S. Army Corps of Engineers, 2001) TEST FOR REMARKS SOILS ROCKS Standard penetration X Use as index test only for strength. Develop local correlations. Unconfined compressive strength in tons/square foot) is often 1/6 to 1/8 of N-value. Direct shear X X Expensive. Use when representative undisturbed samples cannot be obtained. Field vane shear X Use strength reduction factor. Plate bearing X X Evaluate consolidation effects that may occur during test. Uniaxial compression X Primarily for weak rock. Expensive since several sizes of specimens must be tested. Cone penetration test X Consolidated undrained strength of clays. Requires estimate of bearing factor, Nc. Table F-3 In Situ Tests to Determine Stress Conditions (adapted from EM 1110-1-1804, U.S. Army Corps of Engineers, 2001) TEST SOILS ROCKS REMARKS Hydraulic fracturing X Only for normally consolidated or slightly consolidated soils Hydraulic fracturing X Stress measurements in deep holes for tunnels Vane shear X Only for recently compacted clays, silts and fine sands (see Blight, 1974,1 for details and limitations) Overcoring techniques X Usually limited to shallow depth in rock Flatjacks X Uniaxial (tunnel) jacking X X May be useful for measuring lateral stresses in clay shales and rocks, also in soils Pressuremeter (Menard) X 1 Blight, G.E., “Indirect Determination of in situ Stress Ratios in Particulate Materials,” Proceedings of a Specialty Conference, Subsurface Explorations for Underground Excavation and Heavy Construction, American Society of Civil Engineers, New York, 1974. DG-1392, Appendix F, Page F-3 APPENDIX F, Cont’d. Table F-4 In Situ Tests to Determine Deformation Characteristics (adapted from EM 1110-1-1804, U.S. Army Corps of Engineers, 2001) TEST FOR REMARKS SOILS ROCKS Geophysical refraction, crosshole and downhole X X For determining dynamic