What Does Wests Annotated Code Provide Over The Non-Annotated Code Geotechnical Core Logging

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Geotechnical Core Logging

Geotechnical Core Logging is the process of recording rock descriptions on drill logs, the primary means of communicating rock properties used in the design and construction of underground works, including bedrock and bedrock foundations, rock slopes and tunnel support, and rock excavations. The quality of the rock descriptions can greatly influence the success of the project. An appropriate level of detail (as defined in the project-specific end-use objective) should be collected and communicated.

The important aspects of geotechnical logging are the following:

1. Rock descriptions developed for each unit of rock material, defined as a discrete mass that exhibits geological and engineering properties different from those of neighboring materials. Material unit-based rock core logging minimizes the risk of design-critical rock mass relationships being overlooked.

2. Material unit descriptions should be compiled using a standard descriptive code consisting of well-defined terminology in a consistent format.

3. Standardization of the rock core logging descriptor code (at least for individual projects) results in more useful rock descriptions that facilitate geoengineering interpretation, spatial correlation of material units, and engineering analysis to develop design recommendations and construction considerations.

During the geotechnical logging process, we recommend the following steps:

1. Clean the core from drilling fluid or mud.

2. Mark major structures, proposed point load test locations and depths (every 1-2 meters) in undisturbed core splits.

3. Photograph the core in the splits (if using the triple tube method) with a scale placed on the image and a sign indicating the depth from which the core was obtained.

4. Complete the interrupt and basic description logs.

5. Transfer the seed from the divisions to a labeled seed box.

6. When a seed box is full, take a single photo of the seed box with a scale.

7. The steps are detailed in the following sections.

One of the most important things to do with the drilling rig is to photograph the undisturbed core in the fissures. These photographs can later be used to confirm the images of the TV viewers and are an invaluable resource on the boulder and for reviewing the design work.

Proper seed photos require that the seed be cleaned prior to photography. If the core is covered by drilling mud, structural information can be obscured, making it difficult to determine lithologies. Take the time to clean your core properly. The core should be wet if possible, as some structural features do not appear on dry core, so be sure to wet it with a spray bottle or brush.

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