ASTM International

Standard Guide for Geotechnical Mapping of Large Underground Openings in Rock
 N D4879

Annotation

This guide recommends procedures for mapping large subsurface openings made for either civil or mining purposes.

The mapping provides characterization and documentation of the condition of the rock mass at the excavation surface.

The mapping may be accomplished during or after excavation; however, if possible, the mapping should be completed before construction activity modifies or obscures the surface condition and especially any critical geologic features.

The mapping level of detail shall be appropriate for its intended use. This mapping does not replace rigorous investigations to develop physical or mathematical models of behavior.

When soil or soil-like materials are encountered in the excavation, they should also be appropriately mapped and described in accordance with applicable ASTM standards.

Many of the procedures presented in this guide may be used, as well, to map surface excavations.

The mapping does not replace the surveying of excavation geometry.

All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D 6026

The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.