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Case studies on Q-slope method use for slope stability analyses

Komurlu Eren

Studia Geotechnica et Mechanica

2022

Vol. 44, nr 3

190--197

The use of the Q-slope value is a relatively new approach for the stability investigations of rock slopes. In this study, four different slopes in Giresun and Ordu cities of Turkey were investigated to assess whether the Q-slope approach is usable for varying slope heights, or not. A back analysis was carried out for a landslide in a case study quarry located in Kovanlik municipality of Giresun city. Carrying out detailed investigations on the geotechnical drill cores and the field studies, the Q-slope value of the rock mass of the Kovanlik quarry was determined as 0.58. According to the Q-slope approach, the slope which had a landslide under the case of 49° general slope angle and 225 m height should have been stable at a general slope angle of 59°. It has been found that the Q-slope approach is not favorable for a high slope with the height of 225 m. Two roadway excavations with steep slope angles and low heights smaller than 25 m were also investigated within this study. According to the Q-slope value, the roadway slopes which are stable for more than 3 years are estimated to be unstable. Therefore, the Q-slope approach was found also misleading for slopes with low heights like those under 25 m. On the other hand, the Q-slope method usability is confirmed obtaining parallel results with the observations from another case study slope with a height of 78 m. Although it has become a popular empirical method in the recent years, it is recommended to revise the Q-slope approach or limit its use depending on the slope height parameter.

Geospatial data integration in rock engineering

Pinińska J.

Przegląd Geologiczny

2004

Vol. 52, nr 8/2

806-812

Despite the development of measurement methods and the increasing amount of new generation data in rock engineering, many valuable information data are lost together with the locked-out mining archives and associated research institutions. Consequently, a lot of valuable, unique information which could be transformed into new values totally vanishes. Geomechanics, as a relatively new discipline, has so far no tradition of integrated databases. In the European Union, integration attempts are realized through enforcement of the uniform standards; however, the standardization alone will fail to be a successful integration solution until the Digital Terrain Model Data is not implemented into the rock mechanics. Modern information technologies enable to combine and visualize various thematic data, e.g., geological, hydrogeological and mining into a unified digital system with reference to Geographic Information System (GIS). If all the geomechanical data are clearly localized, they can be interpreted, presented, and supplemented with the archival data in a unified format. Visualization of the content of the relational databases by means of digital maps can be done automatically which, as regards rock engineering, will enable the automatic integration of the laboratory data with the geospatial conditions of the environment, including the Spatial Information System (SIP) or Terrain Information System (SIT), i.e., the topographic, geological/environmental and anthropogenic situation (like population, infrastructure, land use plans and prognoses of hazards caused by the land transformation).