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AS 1726:2017


Geotechnical site investigations

Establishes the requirements for the execution of effective geotechnical site investigations and provides a standardized system for the description and classification of soils and rocks, which is largely normative. It addresses spatial and physical characteristics of soil, rock and groundwater, but does not cover the chemical, biological or other environmental aspects of the investigation of contaminated ground.
Published: 02/05/2017
Pages: 72
Table of contents
Cited references
Content history
Table of contents
About this publication
1 Scope
2 Exclusions
3 Normative references
4 Definitions
5 Overview of geotechnical site investigations
5.1 Process
5.1.1 General
5.1.2 Project description
5.1.3 Purpose of investigation
5.1.4 Scope of work
5.1.5 Staging
5.2 Geotechnical model
5.3 Execution of geotechnical site investigation
5.3.1 Health and safety
5.3.2 Competency
5.3.3 Literature review
5.4 Initial assessment of site conditions
5.5 Fieldwork
5.5.1 General
5.5.2 Selection of investigation methods
5.5.3 Data collection and record keeping
5.5.4 Sample handling and management Soil Rock Groundwater Identification and labelling of samples Storage of samples
5.6 Reporting and interpretation
5.6.1 General
5.6.2 Geotechnical data report
5.6.3 Geotechnical interpretive report
5.7 Review of geotechnical site investigation
6 Soil, rock and groundwater
6.1 Soil description and classification
6.1.1 General
6.1.2 Basic approach
6.1.3 Systematic description
6.1.4 Composition of soils General Soil components Identification of components Soil name Assessment of primary component Assessment of secondary and minor components Assignment of a name Peat soils Carbonate soils Plasticity and behaviour (fine grained soils) Particle characteristics (coarse grained soil)
6.1.5 Colour
6.1.6 Soil classification
6.1.7 Condition of soil
6.1.8 Mass properties of soil
6.1.9 Soil origin
6.1.10 Additional observations
6.1.11 Description of fills General Detailed descriptions
6.1.12 Problematic soils
6.1.13 Examples of soil description and classification
6.2 Rock identification, description and classification
6.2.1 Basic concepts
6.2.2 Overview
6.2.3 Description of rock material Rock name Grain size and type Colour Texture and fabric Features, inclusions and minor components Moisture content Durability
6.2.4 Classification of rock material condition Rock material strength Degree of weathering Degree of alteration (alteration intensity)
6.2.5 Description of defects Generalized versus detailed defect description Defect type Defect orientation Defect roughness and shape Defect coatings and composition of seams Defect spacing, length, openness and thickness Block shape
6.2.6 Stratigraphic unit
6.2.7 Geological structure
6.2.8 Examples of rock description and classification
6.2.9 Parameters related to core drilling General Total core recovery Defect spacing or fracture index Rock quality designation
6.2.10 Classification of the rock mass Weathering grades Duricrust grades Rock mass classification schemes
6.3 Surface water and groundwater observations
6.3.1 Surface water
6.3.2 Groundwater
6.3.3 Groundwater quality
6.4 Gases
Appendix A
Appendix B
Appendix C
Appendix D
Appendix E
E1 Geological boundaries and structures mapping symbols
E2 Geological soil and rock mapping symbols
E3 Geomorphological mapping symbols
Appendix F
F1 Industry survey
F2 Changes from previous revision
Cited references in this standard
Methods of testing rocks for engineering purposes, Method 4.2.1: Rock strength tests — Determination of uniaxial compressive strength — Rock strength greater than 50 MPa
Methods of testing rocks for engineering purposes, Method 4.1: Rock strength tests — Determination of point load strength index
Content history
DR2 AS 1726:2016
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