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

IF 0.7 Q4 MECHANICS

Studia Geotechnica et Mechanica Pub Date : 2022-07-27 DOI:10.2478/sgem-2022-0010

E. Komurlu

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引用次数: 2

Abstract

Abstract 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.

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Q斜率法用于边坡稳定性分析的实例研究

摘要Q斜率值的使用是岩石边坡稳定性研究的一种相对较新的方法。在这项研究中，对土耳其吉雷松市和奥尔杜市的四个不同斜坡进行了调查，以评估Q斜坡法是否适用于不同的斜坡高度。对位于吉雷松市Kovanlik市的一个案例研究采石场的滑坡进行了反分析。通过对岩土钻孔岩芯和现场研究进行详细调查，确定Kovanlik采石场岩体的Q斜率值为0.58。根据Q斜率法，在49°一般边坡角和225 m高度的情况下发生滑坡的边坡在59°一般边坡角度下应该是稳定的。研究发现，Q-slope方法不利于高度为225 m的高边坡。本研究还调查了两个陡坡角和小于25 m的低高度的道路开挖。根据Q斜率值，稳定3年以上的巷道边坡估计为不稳定。因此，Q斜率法也被发现对25米以下的低高度斜坡具有误导性。另一方面，Q斜率方法的可用性得到了证实，与另一个78米高度的案例研究斜坡的观测结果平行。尽管近年来它已成为一种流行的经验方法，建议根据斜坡高度参数修改Q斜率方法或限制其使用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Studia Geotechnica et Mechanica MECHANICS-

CiteScore

1.30

自引率

16.70%

发文量

审稿时长

16 weeks

期刊介绍： An international journal ‘Studia Geotechnica et Mechanica’ covers new developments in the broad areas of geomechanics as well as structural mechanics. The journal welcomes contributions dealing with original theoretical, numerical as well as experimental work. The following topics are of special interest: Constitutive relations for geomaterials (soils, rocks, concrete, etc.) Modeling of mechanical behaviour of heterogeneous materials at different scales Analysis of coupled thermo-hydro-chemo-mechanical problems Modeling of instabilities and localized deformation Experimental investigations of material properties at different scales Numerical algorithms: formulation and performance Application of numerical techniques to analysis of problems involving foundations, underground structures, slopes and embankment Risk and reliability analysis Analysis of concrete and masonry structures Modeling of case histories