UOH Academic Repository

Universidad de O'Higgins Libraries



Show simple item record

dc.contributor.author Hekmatnejad, A
dc.contributor.author Emery, X
dc.contributor.author Brzovic, A
dc.contributor.author Schachter, P
dc.contributor.author Vallejos, JA
dc.date.accessioned 2024-01-17T15:55:41Z
dc.date.available 2024-01-17T15:55:41Z
dc.date.issued 2017
dc.identifier.uri https://repositorio.uoh.cl/handle/611/850
dc.description.abstract This work addresses the problem of predicting the discontinuity intensity P-32 (discontinuity area per unit volume of rock mass) in space and of quantifying the uncertainty in the true P-32 values, using information from observed discontinuities intersecting boreholes. This problem is relevant in various fields of engineering, including mining applications, hydrocarbon extraction, groundwater modeling and civil works. The main idea is to calculate experimental P-32 values for borehole segments (composites), based on a Terzaghi weighting of the discontinuities that intersect the boreholes. A validation exercise performed on simulated discrete fracture networks demonstrates that the calculated P-32 values provide unbiased predictions of the true P-32, at both global and local scales, and can therefore be used as experimental data for spatial interpolation purposes. By using geostatistical simulation techniques, the spatial prediction of the P-32 and the corresponding measures of uncertainty can be obtained on a block-by-block basis. This methodology is applied to a data set from the El Teniente copper mine, Codelco-Chile. The objective is to map the expected values of the intensity of stockwork veins with a weak infill mineral assemblage and a typical thickness greater than 1 mm, which are referred to as weak veins. Confidence limits on this intensity and its probability of exceeding given critical values are also estimated. The quality of the prediction and of the uncertainty quantification is checked by leave-one-out cross validation. The resulting confidence limits and probability maps can be used as indicators to define geotechnical domains in the rock mass.
dc.description.sponsorship Chilean Commission for Scientific and Technological Research
dc.relation.uri http://dx.doi.org/10.1016/j.enggeo.2017.07.012
dc.subject Discontinuity area per unit volume
dc.subject Terzaghi correction
dc.subject Geostatistical simulation
dc.subject Spatial uncertainty
dc.subject Spatial interpolation
dc.subject Weak veins
dc.title Spatial modeling of discontinuity intensity from borehole observations at El Teniente mine, Chile
dc.type Artículo
uoh.revista ENGINEERING GEOLOGY
dc.identifier.doi 10.1016/j.enggeo.2017.07.012
dc.citation.volume 228
dc.identifier.orcid Emery, Xavier/0000-0003-0396-5038
uoh.indizacion Web of Science


Files in this item

Files Size Format View

There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record

Search


Browse

My Account


Colecciones


Archivos

Artículos

Tesis

Videos


Cuartiles