Rqd Rock Core Evaluation Manual

ROCK CORE EVALUATION MANUAL

GEOTECHNICAL ENGINEERING MANUAL GEM-23
Revision #1

GEOTECHNICAL ENGINEERING BUREAU APRIL 2007

NEW YORK STATE DEPARTMENT OF TRANSPORTATION

GEOTECHNICAL ENGINEERING MANUAL: ROCK CORE EVALUATION MANUAL GEM-23 Revision #1

STATE OF NEW YORK DEPARTMENT OF TRANSPORTATION GEOTECHNICAL ENGINEERING BUREAU

APRIL 2007

EB 07-039

Page 1 of 21TABLE OF CONTENTS

I.

INTRODUCTION................................................................................................................4

II.

BRIEF GLOSSARY OF GEOLOGIC TERMS ............................................................... 5-6

III.

ROCK CORE EVALUATION PROCEDURE ...................................................................7 A.Recovery............ ......................................................................................................7 B. Rock Quality Designation (RQD) ............................................................................7 C. Rock Type.......... ......................................................................................................8 1. Igneous.........................................................................................................8 2. Metamorphic.... ............................................................................................8 3. Sedimentary...... ...........................................................................................8 a. Compaction......................................................................................9 b. Cementation.... .................................................................................9 D. Color.................. ....................................................................................................13 E. Mineralogy, Grain Size, and Texture .....................................................................13 F. Bedding..................................................................................................................13 G. Fractures............. ....................................................................................................14 H. Size Range of Pieces ..............................................................................................15 I. Hardness.................................................................................................................16 J. Weathering....... ......................................................................................................17 K. Additional Observations ........................................................................................17 L.Photographs............................................................................................................17 M. Rock Core Logs .....................................................................................................18

REFERENCES ........................................................................................................................ 19-20 APPENDIX ...................................................................................................................................21 A Rock Core Evaluation Sheet............ .............................................................. A1-A2 B Sample Rock Core Log (International System of Units)........... ........................... B1

EB 07-039

Page 2 of 21

LIST OF TABLES

Table 1: Table 2: Table 3: Table 4: Table 5: Table 6: Table 7: Table 8:

IgneousRocks .................................................................................................................10 Metamorphic Rocks ........................................................................................................11 Sedimentary Rocks .........................................................................................................12 Sedimentary Rock...