Registro de núcleos de rocas

Geological Society: Engineering Group
Working Party Report on

The Logging of rock cores for
engineering purposes
Registro de núcleos de rocas para propósitos de ingeniería
Content
1 Introduction 2
1.1 General 2
1.2 Purpose 3
1.3 Application 3
1.4 Quality 3
1.5 Organization 3
1.6 Acknowledgements 3
2 General requirements of borehole log 4
2.1 Definition 4
2.2 Types of log 4
2.3Information to be recorded 4
2.3.1 Basic Information 4
2.3.2 Drilling 4
2.3.3 Description 4
2.3.4 Symbolism 5
2.4 Factor determining logging methods 5
2.4.1 Overburden 5
2.4.2 Log format 5
2.4.3 Cost 5
2.4.4 Cost benefit 5
2.4.5 Simplified logs 5
2.4.6 Daily record 6
2.5 Information storage 6
2.6 Style 6
3 The handling labeling and preservation of rocks cores 6
3.1 Core recovery 63.2 Core extraction 6
3.3 Core boxes 6
3.4 Core box labelling 7
3.5 Transportation 7
3.6 Storage 8
3.7 Sample preservation 8
4 Information to be recorded on the borehole log 8
4.1 General information 8
4.1.1 Borehole number 8
4.1.2 Location 8
4.1.3 Drilling technique 9
4.1.4 Contract details 9
4.1.5 Miscellaneous 9
4.2 Drilling progress 9
4.2.1 Daily record information 9
4.2.2Training 10
4.2.3 Non-recoverable information 10
4.2.4 Water 10
4.3 State of recovery of core 10
4.3.1 Core fracturing 10
4.3.2 Core recovery 10
4.3.3 Fracture state 11
4.3.4 R.Q.D. and Stability Index 11
4.4 Descriptive geology 12
4.4.1 Geological information 12
4.4.2 Systematic rock description 12
4.4.3 Weathering classification 12
4.4.4 Discontinuities 13
4.4.5 Discontinuity spacing 134.4.6 Strength 14
4.4.7 Ancillary geological information 14
4.5 Rock grads classification 15
4.5.1 Objective 15
4.5.2 Types of grade scab 15
4.5.3 Limitations 15
5 Proposed borehole log 15
5.1 Arrangment 15
5.2 Data plotting 16
5.3 Layout of log 16
5.3.1 General 16
5.3.2 Borehole number 16
5.3.3 Location 16
5.3.4 Drilling technique 16
5.3.5 Contract details 16
5.3.6 Miscellaneousinformation 16
5.4 Drilling information 17
5.4.1 Arrangement 17
5.4.2 Progress and rare of drilling 17
5.4.3 Core diameter 17
5.4.4 Casing 17
5.4.5 Flush returns 17
5.4.6 Water levels 17
5.4.7 Stare of recovery of core 17
5.5 Geological description 18
5.5.1 Presentation 18
5.5.2 Dimensions 18
5.5.3 Grade scales 18
5.6 Continuation sheets 18
5.7 Simplified logs 18
6 Specifiedrequirements 18
6.1 Essential data 18
6.2 Optional data 19



1 Introduction
1.1 GENERAL
Many engineering geologist devote a significant proportion of their time to the logging of boreholes and, specifically, to the interpretation of the rock cores in engineering term. A variety of techniques have been devised for logging such cores but in the United Kingdom the systems which have been adopted areoften inadequate in relation to modern requirements. The Code of practice for site Investigation (C.P. 2001 1957, 9-1) provides a minimal statement on the methods of preparing logs from boring; no specific advice is given on rock core description. It is apparent, also, that the maximum potential yield of data from many boreholes is not attained and, in consequence, the benefit from drilling notfully realized.

1.1 GENERALIDADES
Muchos ingenieros geólogos dedican gran parte de su tiempo para el registro de pozos de sondeo, específicamente a la interpretación de los núcleos de roca en términos de ingeniería. Una variedad de técnicas se han ideado para el registro de los núcleos, pero en el Reino Unido, los sistemas que se han adoptado a menudo son insuficientes en relación a lasexigencias actuales. Las recomendaciones prácticas en el sitio de Investigación (CP 2001 1957, 9-1) proporcionan un procedimiento mínimo sobre los métodos de preparación de los registros de la perforación, la descripción de la roca base se hace sin la necesidad de una asesoría específica. También es evidente, que no se alcanza el potencial máximo del aprobechamiento de los datos de muchos pozos y,...