6 research outputs found
Application of 3D point cloud data for cut slope monitoring
No full textThis paper discusses the monitoring of slope instability during the construction of an expressway.
As a basis, appropriate geological and engineering-geological investigations were carried out, supported by the application of practical sensing and analysis techniques, including drone-based imaging. The main goal is to present an
example of the detection and monitoring of slope movements using a 3D point cloud obtained from the low-cost,
remote, and precise SfM (Structure from Motion) technique, and appropriate software. The analyzed area represents a
small part of a slope cut on the A2 Expressway Kriva Palanka-Stracin, in the Republic of Macedonia, which is under
construction. The slope cut is excavated in albite-epidote-chlorite schists. In geological terms, it was found that this
part of the cut has favorable conditions for the occurrence of instability. Four different point cloud sets were analyzed
from four different surveys conducted over a total of five months, both before and after the occurrence of the instability.
Multitemporal geomorphic changes in the unstable area were identified by comparing the SfM-derived point clouds in
pairs. 3D distances were estimated with the multiscale model-to-model cloud comparison for each pair of point clouds.
The results show that the displacements on the slope range up to 70 cm. Also, the five-month observation period shows
that the instability is still active. Additional geometrical features that enable easier visualization of changes in the terrain
were utilized. The obtained results show that these procedures for the detection and monitoring of displacements of
unstable terrains can be used as a regular technique for such purposes. The advantages are many, including swiftness,
high detail of prospecting, and the possibility of determining very small movements.
Key words: slope instability; 3D point cloud; SfM technique; monitorin
PRISTUP ZA ZAŠTITU KOSINA NA PRILAZNOM PUTU ZA LUČNU BRANU „SVETA PETKA“ NA RECI TRESKI, REPUBLIKA MAKEDONIJA
No full textStability Aspects of Excavations in Landslide Zone for a Coal mine “Suvodol” - R.Macedonia
No full textThe paper presents some elements of stability aspects and approach used for
excavation at the toe of the large landslide which exists on a NE part of coal mine "Suvodol" in R.Macedonia. Its volume is about 30,000,000 m3. Upper of the main scarp, the earth-fill dam with a length of about 1000 meters exists. As a result of mass movements, about 8,000,000 tonnes of coal is blocked at the toe of the landslide. After a longer time of exposition to the air, the crushed coal is partially involved in a process of self-burning. Specific combination of natural and man-made elements that control the stability of the area and specific methodology used for an excavation at the toe of sliding mass is shortly explained. The results from the stability analyses, risks scenarios, some specific comments and recommendations, are summarized in this paper. Some specific comments are also given
Environmental and stability aspects of excavation in landslide zone at a coal mine "Suvodol" - R.Macedonia
No full textOn a NE part of coal mine "Suvodol", near town Bitola in R.Macedonia, during longer time, a landslide with enormous length and volume exists. Its occurrence is connected with a process of sliding, which happened in several phases, with initial signs of sliding in 1993. The moment of global instability happened on a 27.10.1995. Till now, several phases of reactivation are known. Its volume is about 30 000 000 m3. As a result of mass movements, about 8 000 000 tones of coal is concentrated (blocked) at the toe of the landslide. Upper of the main scarp, spaced about 250
meters, the earth-fill dam with a length of about 1000 meters exists. The ground water artesian effects are also present. At the toe of the landslide, the coal is partially involved in a process of selfburning
and it produces environmental not friendly gases. The stability of the sliding during 2007 was near limit equilibrium. All this aspects shows a very specific combination of natural and manmade elements that control the stability of the environment at this part of coal mine. Having this in mind, the specific approach used in an excavation at the toe of sliding mass, with parallel
supporting (always near limit equilibrium) is shown briefly. The results from the stability tests, with some specific comments, are summarized in this paper
Basic geotechnical parameters of metallic mineral deposits in the Republic of Macedonia
No full textThis paper deals with the analysis of basic geotechnical properties of monolithic rock samples
from several metallic mineral deposits in the Republic of Macedonia. Namely, results from geotechnical investigation
on samples from the deposits of Ilovica, Borov Dol, Kazan Dol, Plavica, Kadiica and Bu�im were subject of the work
presented herein. Over 800 different geotechnical tests have been performed on samples from different depths and zones of these deposits. The most frequently performed basic tests during geotechnical investigation phases included:point load index tests, unconfined compression tests, unit and specific weight, porosity, shear strength along joints.
All data is statistically analyzed and certain conclusions for different geotechnical parameters are achieved. Special
attention is paid to the vertical distribution of the parameter’s values, since this is of greatest interest for the mining planning and processes. Differences among certain deposits are discussed and certain conclusions and recommendations for further investigations are presented. We note that this is a first attempt to analyze such amount of geotechnical data from metallic mineral deposits in Macedonia, and the herein presented correlations are to be updated as new data is collected.
Key words: geotechnical properties; metallic mineral deposits; statistical analysis; vertical distributio
