Affiliation:
1. Faculty of Engineering in Earth Sciences (FICT), ESPOL Polytechnic University, Gustavo Galindo Campus Km 30.5 Perimetral, Guayaquil P.O. Box 09-01-5863, Ecuador
2. Department of Engineering and Terrain Morphology, Polytechnic University of Madrid, 28040 Madrid, Spain
Abstract
The 3D point clouds obtained from the low-cost, remote, and precise SfM (Structure from Motion) technique allow the extraction and acquisition of discontinuities and their characteristics both manually, with the compass and virtual ruler of the Cloud Compare software, and automatically with the DSE (Discontinuity Set Extractor) program, which is faster, more accurate, and safe. Some control plans have been used, which basically consist of identifying one or several fractures and taking measurements on them manually and remotely. The difference between both types of measurements is around 5°, which we believe is reasonable since it is within the precision and repeatability of measurements with a geologist’s compass. This work analyzes the stability of six slopes (five excavated and one natural) by applying five different analysis methodologies based on the rock mass classification system (SMR, RHRSmod, and Qslope), kinematic analysis, and analytical analysis (limit equilibrium). Their results were compared with what was observed in the field to identify the most appropriate analysis methodologies adjusted to reality. The necessary parameters for analyzing each of the slopes, such as orientation, quantity, spacing, and persistence of the discontinuities, were obtained from the automatic analysis. This type of analysis eliminates the subjectivity of the authors, although the findings are related and resemble those obtained manually. The main contribution of the article consists of the application of fast and low-cost techniques to the evaluation of slopes. It is a type of analysis that is in high demand today in many Andean countries, and this work aims to provide an answer. These methodologies suggested by scientific articles such as this one will later be integrated into some procedures and will be taken into account by technical reports. The results show that with the available information and by applying low-cost techniques, the SMR system is the methodology that presents the best results and adjusts better to the reality of the study area. Therefore, SMR is a necessary parameter to determine rockfall hazards through modified RHRS.
Funder
Research Deanship of ESPOL Polytechnic University
Geotechnics Master Program of the Faculty of Engineering in Earth Sciences (FICT, acronym in Spanish) of ESPOL Polytechnic University in Guayaquil, Ecuador
Subject
General Earth and Planetary Sciences
Reference47 articles.
1. Jorda, L., Tomás, R., Rodriguez, M., and Abellan, A. (2016). Manual de Estaciones Geomecánicas. Descripción de Macizos Rocosos En Afloramientos, ETSI Minas.
2. Stability Analysis of Slopes against Combined Circular–Toppling Failure;Mohtarami;Int. J. Rock Mech. Min. Sci.,2014
3. System Probabilistic Model of Rock Slope Stability Considering Correlated Failure Modes;Johari;Comput. Geotech.,2017
4. Limit Equilibrium Analysis on the Stability of Rock Wedges with Linear and Nonlinear Strength Criteria;Deng;Int. J. Rock Mech. Min. Sci.,2021
5. Bayesian-Based Probabilistic Kinematic Analysis of Discontinuity-Controlled Rock Slope Instabilities;Zhou;Bull. Eng. Geol. Environ.,2017