Comparative application of photogrammetry, handmapping and android smartphone for geotechnical mapping and slope stability analysis

With increasing awareness of geotechnical risks in civil and mining structures, taking advantage of smartphone technology to study rocky slopes can play a key role in the development of safe and economical structures for human welfare. In Malawi, there is a research gap on application of portable de...

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Autor principal:	Matsimbe Jabulani
Formato:	article
Lenguaje:	EN
Publicado:	De Gruyter 2021
Materias:	discontinuities excavation geology malawi reliability Geology QE1-996.5
Acceso en línea:	https://doaj.org/article/c97105b83ade4d8c9dd43990af4c860b
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id	oai:doaj.org-article:c97105b83ade4d8c9dd43990af4c860b
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spelling	oai:doaj.org-article:c97105b83ade4d8c9dd43990af4c860b2021-12-05T14:10:48ZComparative application of photogrammetry, handmapping and android smartphone for geotechnical mapping and slope stability analysis2391-544710.1515/geo-2020-0213https://doaj.org/article/c97105b83ade4d8c9dd43990af4c860b2021-02-01T00:00:00Zhttps://doi.org/10.1515/geo-2020-0213https://doaj.org/toc/2391-5447With increasing awareness of geotechnical risks in civil and mining structures, taking advantage of smartphone technology to study rocky slopes can play a key role in the development of safe and economical structures for human welfare. In Malawi, there is a research gap on application of portable devices to collect geotechnical data. Geological engineers still use the unsafe tedious handmapping technique to collect geotechnical data. A road cut that experiences frequent rockfall is used as a case study to investigate if there is a role for smartphones in geotechnics by comparing set statistics of data clusters collected through photogrammetry, smartphone and clar inclinometer. Besides low cost, smartphone’ data capture speed is faster than clar inclinometer. Stereographic and kinematic analysis shows that the 75° dipping road cut is predominantly prone to wedge failure with minor planar failure. For slope stability, Q-slope suggests a new slope angle of 60–66°. An acceptable tolerance limit or error between handmapping and remote data capture systems should be less than ±15°. Set analysis on 111 comparable data points gave a maximum pole vector difference of 10.5°, with the minimum having a difference of 4.8°. For dip, the standard deviations vary from 4.9 to 9.5°, while their mean values vary from −2 to 2.75°. For dip directions, the standard deviations vary from 3.2 to 4.3°, while their mean values vary from −6 to 0.75°. Therefore, android smartphones have a role in geotechnics due to their allowable orientation errors, which show less variance in measured dip/dip direction.Matsimbe JabulaniDe GruyterarticlediscontinuitiesexcavationgeologymalawireliabilityGeologyQE1-996.5ENOpen Geosciences, Vol 13, Iss 1, Pp 148-165 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	discontinuities excavation geology malawi reliability Geology QE1-996.5
spellingShingle	discontinuities excavation geology malawi reliability Geology QE1-996.5 Matsimbe Jabulani Comparative application of photogrammetry, handmapping and android smartphone for geotechnical mapping and slope stability analysis
description	With increasing awareness of geotechnical risks in civil and mining structures, taking advantage of smartphone technology to study rocky slopes can play a key role in the development of safe and economical structures for human welfare. In Malawi, there is a research gap on application of portable devices to collect geotechnical data. Geological engineers still use the unsafe tedious handmapping technique to collect geotechnical data. A road cut that experiences frequent rockfall is used as a case study to investigate if there is a role for smartphones in geotechnics by comparing set statistics of data clusters collected through photogrammetry, smartphone and clar inclinometer. Besides low cost, smartphone’ data capture speed is faster than clar inclinometer. Stereographic and kinematic analysis shows that the 75° dipping road cut is predominantly prone to wedge failure with minor planar failure. For slope stability, Q-slope suggests a new slope angle of 60–66°. An acceptable tolerance limit or error between handmapping and remote data capture systems should be less than ±15°. Set analysis on 111 comparable data points gave a maximum pole vector difference of 10.5°, with the minimum having a difference of 4.8°. For dip, the standard deviations vary from 4.9 to 9.5°, while their mean values vary from −2 to 2.75°. For dip directions, the standard deviations vary from 3.2 to 4.3°, while their mean values vary from −6 to 0.75°. Therefore, android smartphones have a role in geotechnics due to their allowable orientation errors, which show less variance in measured dip/dip direction.
format	article
author	Matsimbe Jabulani
author_facet	Matsimbe Jabulani
author_sort	Matsimbe Jabulani
title	Comparative application of photogrammetry, handmapping and android smartphone for geotechnical mapping and slope stability analysis
title_short	Comparative application of photogrammetry, handmapping and android smartphone for geotechnical mapping and slope stability analysis
title_full	Comparative application of photogrammetry, handmapping and android smartphone for geotechnical mapping and slope stability analysis
title_fullStr	Comparative application of photogrammetry, handmapping and android smartphone for geotechnical mapping and slope stability analysis
title_full_unstemmed	Comparative application of photogrammetry, handmapping and android smartphone for geotechnical mapping and slope stability analysis
title_sort	comparative application of photogrammetry, handmapping and android smartphone for geotechnical mapping and slope stability analysis
publisher	De Gruyter
publishDate	2021
url	https://doaj.org/article/c97105b83ade4d8c9dd43990af4c860b
work_keys_str_mv	AT matsimbejabulani comparativeapplicationofphotogrammetryhandmappingandandroidsmartphoneforgeotechnicalmappingandslopestabilityanalysis
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Comparative application of photogrammetry, handmapping and android smartphone for geotechnical mapping and slope stability analysis

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