Establishing relationships between structural data from close-range terrestrial digital photogrammetry and measurement while drilling data

Document identifier: oai:DiVA.org:ltu-77788
Access full text here:10.1016/j.enggeo.2020.105480
Keyword: Engineering and Technology, Civil Engineering, Geotechnical Engineering, Teknik och teknologier, Samhällsbyggnadsteknik, Geoteknik, Environmental Engineering, Mineral and Mine Engineering, Naturresursteknik, Mineral- och gruvteknik, Other Civil Engineering, Annan samhällsbyggnadsteknik, Close-range terrestrial digital photogrammetry, Measurement while drilling data, Gruv- och berganläggningsteknik, Mining and Rock Engineering
Publication year: 2020
Relevant Sustainable Development Goals (SDGs):
SDG 11 Sustainable cities and communitiesSDG 9 Industry, innovation and infrastructure
The SDG label(s) above have been assigned by OSDG.ai

Abstract:

Geologists, mine planners, geotechnical, and mining engineers always strive for maximum information to get a better insight of the rock mass before interacting with it. Over the recent decades, close-range terrestrial digital photogrammetry (CRTDP) has been increasingly used for data acquisition and to support the conventional methods for rock mass characterization. It provides a safe, time-saving and contact-free way to gather enough data to minimize user dependent biases. However, it requires an expensive camera, fieldwork and some software to extract the information from images. In addition, it can over-estimate the rock fracturing sometimes due to weathering of the rock face or poor blasting practices. Measurement while drilling (MWD) data include the responses of different drilling parameters to the variations in the rock mass. MWD data are produced in large quantity, as they come from every hole drilled. These data correspond to the inside variations of rock rather than the surface ones counted in photogrammetry.

In this paper, structural data are obtained from different bench faces of an open pit mine using a commercial software package, ShapeMetriX3D (by 3GSM). These data are compared to the MWD data of the boreholes that were blasted to produce these bench faces to establish certain relationships between drilling parameters and rock mass structures. Half casts of the boreholes with MWD data were visible on the bench faces of the pre-split wall that allowed a better correlation. The results show abrupt changes in MWD parameters for open joints or cavities with some infilling material and overall increases or decreases in parameters for closely spaced bedding planes, fractures or foliations. The results are promising and suggest the method can be used to characterize the rock mass, modify the charging of explosives in blasting operations and facilitate the geological modeling of the rock mass.

Authors

Sohail Manzoor

Luleå tekniska universitet; Geoteknologi
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Samaneh Liaghat

Luleå tekniska universitet; Geoteknologi
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Anna Gustafson

Luleå tekniska universitet; Geoteknologi
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Daniel Johansson

Luleå tekniska universitet; Geoteknologi
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Håkan Schunnesson

Luleå tekniska universitet; Geoteknologi
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